Investigation method and device for concealed iron building modeling gold mine

Abstract

The invention discloses a concealed iron building modeling gold mine exploration method and device, and the method comprises the steps: carrying out the aviation magnetic measurement of an exploration coverage area or collecting the regional aeromagnetic data, and selecting a target mine area; performing high-precision magnetic measurement on the target mining area to obtain magnetic measurement data in the target mining area, and delineating a gold mine target area in the target mining area according to the magnetic measurement data; performing near-field source three-pole induced polarization measurement on the gold mine target area to obtain near-field source induced polarization measurement data of the gold mine target area, and delineating a shallow mineralized rock stratum or a mineralized zone in the gold mine target area according to the near-field source induced polarization measurement data; performing time domain induced polarization sounding on the shallow mineralized rock stratum or the mineralized zone to obtain sounding data of the shallow mineralized rock stratum or the mineralized zone; and delineating an enrichment zone of underground deep magnetic minerals and sulfides according to the sounding data, and positioning the concealed iron building modeling gold mine, so that the exploration efficiency of the concealed gold mine can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of geophysical exploration, and in particular relates to an exploration method and device for concealed iron-structured gold mines. Background Art

[0002] With the accelerated development of global gold deposit exploration, the probability of discovering gold deposits on the surface is getting lower and lower, and finding hidden gold mines has become the main goal and direction of gold mine exploration. Usually, gold mine refers to gold ore or gold deposit, and gold deposit is an aggregate of gold ore. Banded Iron Formation (BIF) type gold deposit is a greenstone belt type hidden gold deposit under the cover area. During the gold mine exploration process, when the surface is covered by the Quaternary System and there is no bedrock exposed on the surface, the cover area has a shielding and shielding effect, which makes gold mine exploration more difficult.

[0003] Usually, when exploring hidden gold mines, deep drilling methods are often used, that is, using drilling equipment to conduct deep drilling in the covered area to obtain the rock structure deep underground. By identifying the mineralization characteristics of the rock structure deep underground, the location of the gold mine can be explored. However, when this exploration method is used to explore a large area, since the exploration points (drilling holes) need to be arranged in many locations, the exploration is relatively blind, resulting in low exploration efficiency and high cost for hidden gold mines. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a method and device for prospecting a concealed iron structure gold mine. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0005] In a first aspect, the present invention provides a method for prospecting a concealed iron-structured gold mine, comprising:

[0006] Conduct aeromagnetic surveys of the surveyed areas and select target mining areas;

[0007] Conduct high-precision magnetic survey of the target mining area, obtain magnetic survey data within the target mining area, and delineate the gold target area within the target mining area based on the magnetic survey data;

[0008] Conduct near-field source tripole induced polarization measurement on the gold mine target area to obtain near-field source induced polarization measurement data of the gold mine target area, and delineate shallow mineralized rock layers or mineralized zones within the gold mine target area based on the near-field source induced polarization measurement data;

[0009] Conduct time domain induced polarization sounding on shallow mineralized rock layers or mineralized zones to obtain sounding data of shallow mineralized rock layers or mineralized zones;

[0010] Based on the bathymetric data, the enrichment zones of deep underground magnetic minerals and sulfides are delineated and the hidden iron-structured gold mines are located.

[0011] In one embodiment of the present invention, high-precision magnetic measurement is performed on a target mining area, including:

[0012] Perform performance verification of stability, noise level and consistency of high-precision magnetic measuring instruments;

[0013] Use a high-precision magnetic measuring instrument to measure the gradient of the weak magnetic strata in the target mining area to determine the base point and daily variation observation point;

[0014] The daily variation measurement is carried out at the base point by using a high-precision magnetometer, wherein the magnetic field value is collected every 10 seconds, and the basic magnetic field value of the base point is obtained by calculating the arithmetic mean of all magnetic field values ​​within two hours;

[0015] Conduct reliability test on the measurement data of high-precision magnetic measuring instruments;

[0016] The difference between the total magnetic field intensity modulus and the normal field total magnetic field intensity modulus ΔT magnetic field anomaly is calculated, and the difference between the total magnetic field intensity modulus and the normal field total magnetic field intensity modulus ΔT magnetic field anomaly satisfies the following formula:

[0017] △T=T i +△T h +△T 0 -T 0

[0018] Among them, △T magnetic field anomaly is the projection value of the total magnetic field anomaly in the direction of the normal geomagnetic field, T i is the measured magnetic field value of the measuring point after being corrected for diurnal variation, △T h is the height correction value of the measuring point, △T 0 is the normal field correction value of the measuring point, T 0 is the basic magnetic field value of the base point.

[0019] In one embodiment of the present invention, the gold target area is delineated in the target mining area according to the magnetic measurement data, including:

[0020] The △T magnetic field anomaly is subjected to filtering, polarization and extension processing respectively, so as to draw the △T magnetic field anomaly map, polarization anomaly map and extension map;

[0021] Based on the △T magnetic field anomaly map, polarization anomaly map and extension map, the location and extension direction of the strip iron structure are inferred, and the inferred interpretation map is drawn. Based on the inferred interpretation map, the gold target area is delineated in the target mining area.

[0022] In one embodiment of the present invention, a near-field source tripole induced polarization measurement is performed on a gold mine target area to obtain near-field source induced polarization measurement data of the gold mine target area, including:

[0023] Establish an underground DC electric field, use a near-field source three-pole induced polarization measurement device to measure the gold mine target area, and obtain the apparent resistivity and apparent polarizability of each measuring point in the gold mine target area;

[0024] Conduct reliability test on the measurement data of the near-field source three-pole induced polarization measurement device;

[0025] According to the apparent resistivity and apparent polarizability of each measuring point in the gold target area, the apparent metal factor is calculated by the first formula, and the apparent induced polarization rate is calculated by the second formula;

[0026] The first formula is: J s =η s / ρ s ×10 -4 ;

[0027] The second formula is: G s =η s *ρ s ;

[0028] Among them, J s Depending on the metal factor, G s is the apparent electroresonance, η s is the apparent polarizability, ρ s is the apparent resistivity.

[0029] In one embodiment of the present invention, based on the near-field source induced polarization measurement data, the shallow mineralized rock layer or mineralized zone is delineated in the gold mine target area, including:

[0030] According to the apparent metallic factor, apparent induced electrical conductivity, apparent polarizability and apparent resistivity of each measuring point in the gold target area, the Kriging data grid method is used to draw the contour plane or cross-sectional diagram of the apparent metallic factor, apparent induced electrical conductivity, apparent polarizability and apparent resistivity respectively;

[0031] Based on the contour plan or profile of apparent metal factor, apparent induced polarization, apparent polarizability and apparent resistivity, shallow mineralized rock layers or mineralized zones are delineated within the gold target area.

[0032] In one embodiment of the present invention, time domain induced polarization sounding is performed on a shallow mineralized rock layer or a mineralized zone to obtain sounding data of the shallow mineralized rock layer or a mineralized zone, including:

[0033] A symmetrical quadrupole sounding device is used to conduct time domain induced polarization sounding on a shallow mineralized rock layer or mineralized zone to obtain the apparent resistivity and apparent polarizability of each sounding point in the shallow mineralized rock layer or mineralized zone;

[0034] Before the symmetrical quadrupole sounding device performs sounding, the electrode grounding point of the symmetrical quadrupole sounding device is subjected to water locking treatment;

[0035] Before the symmetrical quadrupole sounding device conducts sounding, the current stability test is carried out on the first starting pole distance and the last ending pole distance of each sounding point;

[0036] Obtaining measurement data of each sounding point, if the measurement data of the current sounding point changes abnormally, re-arranging the electrodes of the symmetrical quadrupole sounding device, and changing the power supply current of the symmetrical quadrupole sounding device to perform repeated measurements for multiple times;

[0037] The reliability of the measurement data of the symmetrical quadrupole sounding device is tested.

[0038] In one embodiment of the present invention, the enrichment zone of deep underground magnetic minerals and sulfides is delineated according to the bathymetric data, and the hidden iron-structured gold mine is located, including:

[0039] According to the apparent resistivity and apparent polarizability of each depth measurement point in the shallow mineralized rock layer or mineralized zone, the two-dimensional cross-section diagrams of the apparent resistivity and apparent polarizability are drawn respectively by using the Kriging data grid method;

[0040] Based on the two-dimensional cross-section diagram of apparent resistivity and apparent polarizability, the enrichment zones of deep underground magnetic minerals and sulfides are delineated and hidden iron-structured gold deposits are located.

[0041] In one embodiment of the present invention, performing an aeromagnetic survey on the survey coverage area includes performing an aeromagnetic survey on the survey coverage area based on a scale of 1:125,000 or 1:50,000;

[0042] Conduct high-precision magnetic surveys of target mining areas, including high-precision magnetic surveys of target mining areas based on a scale of 1:10,000;

[0043] Conduct near-field source tripole induced polarization measurement on the gold mine target area, including near-field source tripole induced polarization measurement on the gold mine target area based on a scale of 1:5 thousand.

[0044] In a second aspect, the present invention provides an exploration device for a concealed iron structure type gold mine, using the exploration method for a concealed iron structure type gold mine provided in the above scheme, comprising:

[0045] Aerial magnetic measurement equipment, used to conduct aeromagnetic measurement of the survey coverage area;

[0046] Proton magnetometer, used to conduct high-precision magnetic measurement of the target mining area and obtain magnetic measurement data within the target mining area;

[0047] A near-field source three-pole induced polarization measurement device is used to perform near-field source three-pole induced polarization measurement on the gold mine target area and obtain near-field source induced polarization measurement data of the gold mine target area;

[0048] The symmetrical quadrupole sounding device is used to perform time domain induced polarization sounding on shallow mineralized rock layers or mineralized zones to obtain sounding data of shallow mineralized rock layers or mineralized zones.

[0049] In one embodiment of the present invention, the near-field source three-pole induced polarization measurement device includes an A pole, an M pole and an N pole, the distance between the A pole and the M pole of the near-field source three-pole induced polarization measurement device is 10m, and the distance between the M pole and the N pole of the near-field source three-pole induced polarization measurement device is 90m;

[0050] The symmetrical quadrupole sounding device includes pole A, pole M, pole N and pole B. The distance between pole A and pole B of the symmetrical quadrupole sounding device is at least 3m and at most 2000m. The distance between pole M and pole N of the symmetrical quadrupole sounding device is one of 0.5m, 3m, 15m and 50m.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] In the above scheme of the present application, when exploring for hidden iron-structured gold mines, first, aerial magnetic surveys can be conducted on the exploration coverage area (or aerial magnetic data can be collected) to select the target mining area; then, high-precision magnetic surveys can be conducted on the target mining area to obtain magnetic survey data within the target mining area, and based on the magnetic survey data, the gold mine target area can be delineated within the target mining area; then, near-field source tripole induced polarization measurements can be conducted on the gold mine target area to obtain near-field source induced polarization measurement data of the gold mine target area, and based on the near-field source induced polarization measurement data, shallow mineralized rock formations or mineralized zones can be delineated within the gold mine target area; finally, time-domain induced polarization sounding can be conducted on the shallow mineralized rock formations or mineralized zones to obtain sounding data of the shallow mineralized rock formations or mineralized zones; and based on the sounding data, the enrichment zones of deep underground magnetic minerals and sulfides can be delineated to locate the hidden iron-structured gold mines. In this way, when surveying a large area, you can first conduct aeromagnetic surveys through aerial magnetic measurement (or collect regional aeromagnetic data) to limit the survey area to the target mining area, and then conduct magnetic surveys through high-precision magnetic measurement to further limit the target mining area to the gold mine target area, and then conduct local area scanning measurements of near-field source tripole induced polarization method through near-field source tripole induced polarization measurement to delineate shallow mineralized rock layers or mineralized zones in the gold mine target area, and finally use time domain induced polarization sounding to conduct deep exploration to locate hidden iron-structured gold mines. Compared with the exploration method of traditional deep drilling, the above-mentioned method of this application can be connected with each other, verified with each other, from shallow to deep, and can economically, quickly and effectively realize the gradual and accurate positioning of hidden gold mines, reduce the blindness of exploration, and improve the exploration efficiency of hidden gold mines.

[0053] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1It is a schematic diagram of a method for prospecting a concealed iron-structured gold mine provided by an embodiment of the present invention;

[0055] Figure 2 is a plane diagram of ΔT magnetic field anomaly during high-precision magnetic measurement in Example 1 of the embodiment of the present invention;

[0056] Figure 3 It is a comparison diagram of the apparent polarizability anomaly in the near-field source tripole induced polarization measurement and the ΔT magnetic field anomaly in the high-precision magnetic measurement in Example 1 of the embodiment of the present invention;

[0057] Figure 4 is a parameter abnormality profile diagram of the near-field source three-pole induced polarization measurement in Example 1 of the embodiment of the present invention;

[0058] Figure 5 is a comprehensive cross-sectional diagram of time domain induced polarization sounding according to Example 1 of an embodiment of the present invention;

[0059] Figure 6 is a plane diagram of ΔT magnetic field anomaly during high-precision magnetic measurement in Example 2 of the embodiment of the present invention;

[0060] Figure 7 This is a comprehensive exploration profile diagram of Example 2 in the embodiment of the present invention. DETAILED DESCRIPTION

[0061] The present invention is further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0062] Embodiment 1:

[0063] See also Figure 1 The embodiment of the present invention provides a method for prospecting a concealed iron-structured gold mine, comprising:

[0064] Conduct aeromagnetic survey or collect aeromagnetic data in the survey coverage area to select target mining areas;

[0065] Conduct high-precision magnetic survey of the target mining area, obtain magnetic survey data within the target mining area, and delineate the gold target area within the target mining area based on the magnetic survey data;

[0066] Conduct near-field source tripole induced polarization measurement on the gold mine target area to obtain near-field source induced polarization measurement data of the gold mine target area, and delineate shallow mineralized rock layers or mineralized zones within the gold mine target area based on the near-field source induced polarization measurement data;

[0067] Conduct time domain induced polarization sounding on shallow mineralized rock layers or mineralized zones to obtain sounding data of shallow mineralized rock layers or mineralized zones;

[0068] Based on the bathymetric data, the enrichment zones of deep underground magnetic minerals and sulfides are delineated and the hidden iron-structured gold mines are located.

[0069] In some embodiments of the present application, banded iron formation gold deposits are a major type of greenstone belt gold deposits, which are closely related to banded iron formations, and their production accounts for about 13% of the world's total production. In banded iron formation gold deposits, the morphology and occurrence of gold ore bodies are controlled by both interlayer shear zones and banded iron formation rock formations, showing obvious lithology-structure dual ore-control characteristics.

[0070] In some embodiments of the present application, banded iron formations are the detection target for detecting iron formation type gold mines using geophysical methods. The detection target (banded iron formation) and the detection target (gold ore) have the characteristics of extremely strong magnetism, low-medium resistance, and high polarization. The ore-bearing surrounding rock has the characteristics of micro-magnetism, medium-high resistance, and micro-polarization. Since there are obvious differences in magnetic, electrical, and induced polarization properties between the detection target and the surrounding rock, it is possible to indirectly find hidden iron formation type gold mines through magnetic measurement and induced polarization measurement. Hidden iron formation type gold mines are closely related to banded iron-containing formations in the strata, and banded iron formations are the prerequisite and necessary condition for finding iron formation type gold mines.

[0071] In some embodiments of the present application, the above-mentioned aeromagnetic measurement is also called aeromagnetic measurement or aeromagnetic exploration, referred to as aeromagnetic or aeromagnetic measurement, which is the earliest, most mature and most widely used magnetic measurement method in aeroponic geophysical exploration methods. It is a geophysical method that loads an aeromagnetic magnetometer and its supporting auxiliary equipment on an aircraft to measure the intensity or gradient of the geomagnetic field according to a pre-set survey line and altitude over the survey area. Compared with ground magnetic survey, it has higher measurement efficiency and is not limited by waters, forests, swamps, deserts and mountains. At the same time, since the flight is carried out at a certain height above the surface, the influence of surface magnetic inhomogeneities is weakened, and the magnetic field characteristics of deep geological bodies can be more clearly reflected.

[0072] In some embodiments of the present application, when performing aerial magnetic survey on the survey coverage area, the target mining area can be measured quickly and efficiently in a large survey area, thereby improving the efficiency of the survey.

[0073] In some embodiments of the present application, high-precision magnetic measurement is a high-precision measurement technology using a high-precision magnetometer, which has the characteristics of high reading accuracy, multiple observation parameters and convenient and fast field construction. High-precision magnetic measurement can use the magnetic differences between different rocks (ores) to delineate lithological boundaries, find out the distribution of strata, rock bodies, fractures in the exploration area, and geological structures related to mineralization. Because there is a certain amount of magnetite in banded iron formations and gold ores, both have extremely strong magnetism, and are significantly different from the magnetic background rocks around them. They have a magnetic basis for finding banded iron formations and gold deposits in non-(micro)magnetic background rocks, which can cause very obvious narrow and steep magnetic anomalies with small width. Therefore, banded iron formations and gold ores are conducive to the discovery and identification of ground magnetic measurement devices. The ground high-precision magnetic measurement in the embodiment of the present application can improve, supplement and verify the abnormal areas of aerial magnetic measurement, delineate and explain the detailed characteristics of magnetic anomalies caused by banded iron formations, and make up for the shortcomings of geological mapping in areas without bedrock outcrops.

[0074] It is understandable that since gold deposits generally contain various metal sulfide minerals, these metal sulfide minerals can be used as detection polarization targets to form a relatively strong polarizability abnormal reaction. Therefore, the induced polarization characteristics of metal sulfides can be used to explore metal sulfides through the induced polarization method to indirectly discover hidden gold mines. The induced polarization method is an exploration method in the form of an artificial field source that uses the differences in the conductivity and induced polarization characteristics of rocks and ores to observe and study the changing laws of the artificially formed induced polarization field to find minerals and solve other geological problems.

[0075] In some embodiments of the present application, near-field source induced polarization measurement is a geophysical method that uses the near-field source induced polarization method for measurement. It has the characteristics of obtaining a large signal (secondary field) for a small current, and can quickly map shallow surface mineralized rock layers or mineralized alteration zones. Near-field source induced polarization measurement includes dipole induced polarization measurement, tripole induced polarization measurement, and quadrupole induced polarization measurement. Among them, the primary and secondary potential differences of near-field source tripole induced polarization measurement are relatively large, which can effectively avoid the interference of large stray currents and electromagnetic coupling in the measurement circuit, and improve the measurement accuracy. The near-field source tripole induced polarization measurement of the present application is based on the induced polarization effect of rock (ore) stone as a physical property premise, artificially establishes an underground DC electric field, and uses a tripole induced polarization device to measure the changes in the transverse induced polarization effect within a certain depth range underground. Although the detection depth of near-field source tripole induced polarization measurement is shallow, it is low-cost and highly efficient. Carrying out local area scanning measurement using near-field source tripole induced polarization method in the gold mine target area delineated by high-precision magnetic measurement can economically and quickly delineate shallow mineralized rock layers or mineralized zones and provide evidence for magnetic measurement anomalies.

[0076] In some embodiments of the present application, induced polarization sounding is a geophysical method for deep geological exploration using the induced polarization phenomenon. It searches for metals and solves problems such as hydrogeology and engineering geology based on the induced polarization effect of rocks and ores. This method is divided into direct current induced polarization method (time domain induced polarization sounding method) and alternating current induced polarization method (frequency domain induced polarization sounding method). During the charging and discharging process, the additional electric field phenomenon that changes slowly over time due to electrochemical action is called the induced polarization effect. Time domain induced polarization sounding uses the difference in induced polarization effects of different rocks and ores as its material basis, and explores underground geological conditions by observing and studying the induced polarization effect of the earth. Commonly used induced polarization sounding devices include geometric sounding devices, Wenner sounding devices, fixed point source sounding devices, and symmetrical quadrupole sounding devices.

[0077] In some embodiments of the present application, time domain induced polarization sounding is performed by a symmetrical quadrupole device. During the sounding, an artificial source supplies a large current to the underground, measures the change in the potential difference of the underground rock (ore), and observes the distribution law of the DC induced polarization field to obtain the change characteristics of the apparent resistivity and apparent polarizability parameters, and delineate and divide the output state of the target body in different depth ranges underground. As a verification method for high-precision magnetic anomalies and near-field source induced polarization anomalies on the ground, time domain induced polarization sounding can obtain the electrical distribution characteristics or spatial occurrence state of banded iron structures and gold ore bodies in the vertical dimension in the underground section, thereby determining the location, occurrence and other information of underground striped iron structures and gold ore bodies. The content of metal sulfides such as magnetite, pyrite, and pyrrhotite in banded iron structures and gold ores is relatively high, which can produce obvious high polarizability and low resistivity anomalies. Since banded iron structures and gold ores have the characteristics of low resistance and high polarization, and their surrounding rocks have the characteristics of high resistance and low polarization, time domain induced polarization sounding is convenient for spatially locating underground hidden iron-bearing structures and gold deposits.

[0078] In the above scheme of the present application, when exploring for hidden iron-structured gold mines, aerial magnetic surveys can be first conducted on the surveyed area (or regional aeromagnetic data can be collected) to select the target mining area; high-precision magnetic surveys can then be conducted on the target mining area to obtain magnetic survey data within the target mining area, and based on the magnetic survey data, the gold mine target area can be delineated within the target mining area; near-field source tripole induced polarization surveys can then be conducted on the gold mine target area to obtain near-field source induced polarization survey data within the gold mine target area, and based on the near-field source induced polarization survey data, shallow mineralized rock formations or mineralized zones can be delineated within the gold mine target area; finally, time-domain induced polarization sounding can be conducted on the shallow mineralized rock formations or mineralized zones to obtain sounding data of the shallow mineralized rock formations or mineralized zones; and based on the sounding data, the enrichment zones of deep underground magnetic minerals and sulfides can be delineated to locate the hidden iron-structured gold mines. In this way, when surveying a large area, you can first conduct aeromagnetic surveys through aerial magnetic measurement (or collect regional aeromagnetic data) to limit the survey area to the target mining area, and then conduct magnetic surveys through high-precision magnetic measurement to further limit the target mining area to the gold mine target area, and then conduct local area scanning measurements of near-field source tripole induced polarization method through near-field source tripole induced polarization measurement to delineate shallow mineralized rock layers or mineralized zones in the gold mine target area, and finally use time domain induced polarization sounding for depth exploration to locate hidden iron-structured gold mines. Compared with the exploration method of traditional deep drilling, the above-mentioned method of this application can be interconnected and verified with each other, from shallow to deep, and can economically, quickly and effectively realize the gradual and accurate positioning of hidden gold mines, reduce the blindness of exploration, and improve the exploration efficiency of hidden gold mines.

[0079] In addition, compared with the traditional gold mine exploration method of large detection depth, high resolution frequency domain or time domain induced polarization and controlled source audio magnetotelluric method or wide-area electromagnetic method, the above method of the present application has the advantages of low construction conditions, low economic cost, high work efficiency, wide application range, and less geographical influence.

[0080] In some embodiments of the present application, high-precision magnetic measurement is performed on the target mining area, including:

[0081] Perform performance verification of stability, noise level and consistency of high-precision magnetic measuring instruments;

[0082] Use a high-precision magnetic measuring instrument to measure the gradient of the weak magnetic strata in the target mining area to determine the base point and daily variation observation point;

[0083] Continuous diurnal variation measurements are carried out at the base point using a high-precision magnetometer (it can be carried out at night when diurnal variation is relatively stable), where the magnetic field value is collected every 10 seconds, and the basic magnetic field value of the base point is obtained by calculating the arithmetic mean of all magnetic field values ​​within two hours;

[0084] Conduct reliability test on the measurement data of high-precision magnetic measuring instruments;

[0085] The difference between the total magnetic field intensity modulus and the normal field total magnetic field intensity modulus △T magnetic field anomaly is calculated. The difference between the total magnetic field intensity modulus and the normal field total magnetic field intensity modulus △T magnetic field anomaly satisfies the following formula:

[0086] △T=T i +△T h +△T 0 -T 0

[0087] Among them, △T magnetic field anomaly is the projection value of the total magnetic field anomaly in the direction of the normal geomagnetic field, T i is the measured magnetic field value of the measuring point after being corrected for diurnal variation, △T h is the height correction value of the measuring point, △T 0 is the normal field correction value of the measuring point, T 0 is the basic magnetic field value of the base point.

[0088] In some embodiments of the present application, when performing high-precision magnetic measurement on the target mining area, a 100m×20m survey network may be used for measurement, wherein the survey line may be perpendicular to the strike of the regional geological structure or the long axis direction of the aeromagnetic anomaly.

[0089] In some embodiments of the present application, the high-precision magnetometer is a proton magnetometer with a resolution of 0.1 nanoT, and the measurement parameter is the total geomagnetic field T. Before and after the measurement, all proton magnetometers in use need to be checked for stability, noise level, and consistency.

[0090] In some embodiments of the present application, when the target mining area is measured by a high-precision magnetometer, a stratum with weaker magnetism can be selected first, and a stable magnetic field can be preliminarily selected through a cross section, and then a gradient measurement is performed to determine the base point and the daily variation observation point. Among them, the radius around the base point is 2m, and the magnetic field change within the range of 0.5m of the height difference is not more than 2nT. The gradient measurement of high-precision magnetic measurement mainly involves measuring the rate of change of the magnetic field in space, which is usually achieved by measuring the change of the vertical gradient or the horizontal gradient. The base point is mainly used to measure the basic value of the geomagnetic field, that is, the stable value of the earth's magnetic field in the absence of external interference. The daily variation observation point is also called the daily variation station, which is mainly used to observe the change of the geomagnetic day, that is, the change of the geomagnetic field over time. The measuring point is the point position actually measured by the proton magnetometer. During the measurement, multiple measuring points need to be arranged according to the measuring network, and the proton magnetometer needs to measure separately at multiple measuring points.

[0091] In some embodiments of the present application, during the measurement by the high-precision magnetometer, the surveying personnel are strictly prohibited from wearing or carrying magnetic items to avoid magnetic storms and magnetic disturbances. Before measurement, the observation instrument of the high-precision magnetometer and the daily variation observation instrument need to be calibrated to achieve second-level synchronization. The daily variation observation starts before the early calibration point and ends after the late calibration point. When encountering a sudden change in magnetic measurement data, return to the previous point and repeat the measurement. The difference between the early and late calibration points of the measurement data of each high-precision magnetometer after daily variation correction is less than 3nT, and the measurement data of this high-precision magnetometer on that day can be deemed valid. Otherwise, the measurement data will be invalidated and remeasured.

[0092] In some embodiments of the present application, when the reliability of the measurement data of the high-precision magnetic survey is tested, the high-precision magnetic survey is quality checked according to the method of "same point, different date, different operator, different instrument" (same and three different), and the inspection ratio is not less than 5%. During the inspection, the observation accuracy of the high-precision magnetic survey on the abnormal field and the background field is calculated, and the average relative error and the mean square error are used to measure respectively. When the mean square error is less than 3nT and the average relative error is less than 10%, the data is confirmed to be reliable. Among them, the abnormal field refers to the area where the magnetic survey anomaly appears in the measurement data of the high-precision magnetic survey. The background field refers to the surrounding area of ​​the abnormal field. Confirming that the data is reliable includes confirming that the collected data and measurement results are accurate and meet the expected standards and requirements. The data specifically includes technical design (data collection, survey area exploration, survey network scale, magnetic survey accuracy, base point and diurnal variation station selection, geodetic work, etc.), instrument performance verification (performance test, storage and maintenance), field measurement (diurnal variation observation, survey point observation, rock magnetic parameter determination, etc.), data collation and processing and interpretation (△T magnetic anomaly value calculation, magnetic anomaly accuracy calculation, rock magnetic parameter calculation, 2.5-dimensional human-computer interactive inversion of precision profile, etc.).

[0093] In some embodiments of the present application, the measured magnetic field values ​​measured by a high-precision magnetometer need to be corrected for daily variation, normal field correction, and altitude, and the correction accuracy is controlled within 1.0nT. When correcting for daily variation, the correction value of the daily variation correction is obtained by linear interpolation of the daily variation observation value after smoothing. When correcting for the normal field, the Gaussian spherical harmonic analysis method is used to calculate the international geomagnetic reference field, and the Gaussian coefficient is provided by the international geomagnetic reference field to calculate the normal field correction value of the geomagnetic field value of each node in the mining area. When correcting for altitude, the correction value of the altitude correction is obtained by the formula -3T 0 / R is calculated, where T 0 is the basic magnetic field value of the base point, R is the average radius of the earth, R=6371000m.

[0094] In some embodiments of the present application, the gold target area is delineated in the target mining area according to the magnetic measurement data, including:

[0095] The △T magnetic field anomaly is subjected to filtering, polarization and extension processing respectively, so as to draw the △T magnetic field anomaly map, polarization anomaly map and extension map;

[0096] Based on the △T magnetic field anomaly map, polarization anomaly map and extension map, the location and extension direction of the strip iron structure are inferred, and the inferred interpretation map is drawn. Based on the inferred interpretation map, the gold target area is delineated in the target mining area.

[0097] In some embodiments of the present application, before filtering, polarizing and extending the ΔT magnetic field anomaly, the target mining area is expanded, that is, the boundary of the target mining area is expanded outward by 100m. In this way, the edge loss and distortion of the mining area can be reduced, and the accuracy of the measurement data can be improved.

[0098] In some embodiments of the present application, the △T magnetic field anomaly map includes a △T magnetic field anomaly plane map and a △T magnetic field anomaly profile map. In the △T magnetic field anomaly plane map, the contour lines below -300nT can reflect the banded iron structure and the gold ore body or the mineralized alteration zone. In addition to drawing the △T magnetic field anomaly map, the polarization anomaly map and the extension map, a vertical two-conductor plane map can also be drawn. In addition, the magnetic survey mark of the position and extension direction of the strip iron structure is a linear, beaded strong negative magnetic anomaly belt or a strong magnetic anomaly belt with positive and negative associations. In addition, a precision measurement profile is arranged at the center of the magnetic anomaly, and a 2.5-dimensional human-computer interactive forward fitting is performed after the abnormal polarization. The forward fitting calculates the magnetic parameters of the iron structure using an effective magnetization intensity of 28000×10-3A / m and an effective magnetization inclination of -30° to quantitatively infer and interpret the burial depth of the iron structure and the gold ore body.

[0099] In some embodiments of the present application, near-field source tripole induced polarization measurement is performed on a gold mine target area to obtain near-field source induced polarization measurement data of the gold mine target area, including:

[0100] Establish an underground DC electric field, use a near-field source three-pole induced polarization measurement device to measure the gold mine target area, and obtain the apparent resistivity and apparent polarizability of each measuring point in the gold mine target area;

[0101] Conduct reliability test on the measurement data of the near-field source three-pole induced polarization measurement device;

[0102] According to the apparent resistivity and apparent polarizability of each measuring point in the gold target area, the apparent metal factor is calculated by the first formula, and the apparent induced polarization rate is calculated by the second formula;

[0103] The first formula is: J s =η s / ρ s ×10 -4 ;

[0104] The second formula is: G s =ηs *ρ s ;

[0105] Among them, J s Depending on the metal factor, G s is the apparent electroresonance, η s is the apparent polarizability, ρ s is the apparent resistivity.

[0106] In some embodiments of the present application, when a near-field source tripole induced polarization measuring device is used to measure the gold target area, a 100m×20m measuring network can be used for measurement, wherein the measuring line is perpendicular to the long axis direction of the ground high-precision magnetic measurement demarcation anomaly or the inferred extension direction of the iron-bearing structure. The near-field source tripole induced polarization measuring device uses three poles (A pole, M pole, N pole), the spacing between the A pole and the M pole is 10m, the spacing between the M pole and the N pole is 90m, the A pole, the M pole and the N pole move along the measuring line, and the C pole is fixed at "infinity" and perpendicular to the measuring line; the power supply wire resistance is less than 10Ω / km, the power supply electrode adopts a steel brazing electrode, and the measuring electrode adopts a Cu-CuSO4 liquid non-polarized electrode, the internal resistance is less than 1kΩ, and the range is less than 2mv; the power supply mode is a bidirectional short pulse, the power supply cycle is 8s, the delay is 100s, and the number of superpositions is 2 times. The main acquisition parameters are: power supply current, primary potential, apparent resistivity, apparent polarizability, etc.

[0107] In some embodiments of the present application, when performing reliability testing on the measurement data of the near-field source three-pole induced polarization measurement device, the near-field source three-pole induced polarization device is quality checked in the manner of "same location, same instrument, different operators, different dates" (two same and two different), and the inspection ratio is not less than 5%. The working accuracy of the near-field source three-pole induced polarization measurement is calculated and measured by the mean square error or the mean square relative error. When the apparent polarization rate and the apparent resistivity both reach Class A accuracy, the data is confirmed to be reliable.

[0108] In some embodiments of the present application, shallow mineralized rock layers or mineralized zones are delineated in the gold mine target area based on near-field source induced polarization measurement data, including:

[0109] According to the apparent metallic factor, apparent induced electrical conductivity, apparent polarizability and apparent resistivity of each measuring point in the gold target area, the Kriging data grid method is used to draw the contour plane or cross-sectional diagram of the apparent metallic factor, apparent induced electrical conductivity, apparent polarizability and apparent resistivity respectively;

[0110] Based on the contour plan or profile of apparent metal factor, apparent induced polarization, apparent polarizability and apparent resistivity, shallow mineralized rock layers or mineralized zones are delineated within the gold target area.

[0111] In some embodiments of the present application, in the contour plan or cross-sectional diagram of the apparent metallic factor, apparent induced polarization, apparent polarizability, and apparent resistivity, the abnormal signs of the occurrence location and extension direction of the banded iron-bearing structure are abnormal bands with low resistance and high polarization.

[0112] In some embodiments of the present application, time domain induced polarization sounding is performed on a shallow mineralized rock layer or a mineralized zone to obtain sounding data of the shallow mineralized rock layer or a mineralized zone, including:

[0113] A symmetrical quadrupole sounding device is used to conduct time domain induced polarization sounding on a shallow mineralized rock layer or mineralized zone to obtain the apparent resistivity and apparent polarizability of each sounding point in the shallow mineralized rock layer or mineralized zone;

[0114] Before the symmetrical quadrupole sounding device performs sounding, the electrode grounding point of the symmetrical quadrupole sounding device is subjected to water locking treatment;

[0115] Before the symmetrical quadrupole sounding device conducts sounding, the current stability test is carried out on the first starting pole distance and the last ending pole distance of each sounding point;

[0116] Obtaining measurement data of each sounding point, if the measurement data of the current sounding point changes abnormally, re-arranging the electrodes of the symmetrical quadrupole sounding device, and changing the power supply current of the symmetrical quadrupole sounding device to perform repeated measurements for multiple times;

[0117] The reliability of the measurement data of the symmetrical quadrupole sounding device is tested.

[0118] In some embodiments of the present application, a symmetrical quadrupole sounding device is used to perform time domain induced polarization sounding on shallow mineralized rock layers or mineralized zones. Multiple measuring points can be set for sounding, and the spacing between adjacent measuring points can be 40m. The symmetrical quadrupole sounding device has four electrodes (A pole, M pole, N pole, B pole), A pole and B pole are power supply electrodes, the maximum spacing between the two is 2000m, and the minimum spacing is 3m; M pole and N pole are measuring electrodes, and the spacing between the two can be set to 0.5m, 3m, 15m, 50m respectively, and the power supply mode adopts bidirectional short pulse, the power supply time is 8s, the power supply cycle is 32s, and the delay is 200ms.

[0119] In some embodiments of the present application, when the electrode grounding of the symmetrical quadrupole sounding device is subjected to water locking treatment, the water locking treatment can be performed by pouring salt water and washing powder water. In this way, the surrounding grounding resistance can be reduced and stabilized, the power supply current can be increased, and the repeatability of the data can be ensured.

[0120] In some embodiments of the present application, the apparent polarizability parameter is observed multiple times, and the observed data are identified by combining the attenuation curve characteristics of the secondary field continuous sampling window. When two observed data values ​​meet the attenuation law (i.e. |η s1 |>|ηs2 |>|η s3 |>……|η s7 |>0) and the first block polarizability value is similar, the data is considered qualified.

[0121] In some embodiments of the present application, when performing reliability detection on the measurement data of the symmetrical quadrupole sounder, the time domain induced polarization sounder can be quality checked in the manner of "same location, same instrument, different operators, different dates" (two same and two different), with the inspection ratio being no less than 5% of the total workload. The mean square relative error and mean square error of a single sounding point of the time domain induced polarization sounder are first calculated, and then the mean square relative error and mean square error of the apparent resistivity and apparent polarizability of the entire area are calculated. When the apparent polarization rate and apparent resistivity of the entire area both reach Class A accuracy, the data is confirmed to be reliable.

[0122] In some embodiments of the present application, the enrichment zone of deep underground magnetic minerals and sulfides is delineated according to the bathymetric data, and the hidden iron-structured gold mine is located, including:

[0123] According to the apparent resistivity and apparent polarizability of each depth measurement point in the shallow mineralized rock layer or mineralized zone, the two-dimensional cross-section diagrams of the apparent resistivity and apparent polarizability are drawn respectively by using the Kriging data grid method;

[0124] Based on the two-dimensional cross-section diagram of apparent resistivity and apparent polarizability, the enrichment zones of deep underground magnetic minerals and sulfides are delineated and hidden iron-structured gold deposits are located.

[0125] In some embodiments of the present application, in the two-dimensional cross-sectional diagram of apparent resistivity and apparent polarizability, the abnormal signs of the position and extension direction of the strip-shaped iron-containing structure are abnormal bands of low resistance and high polarization, wherein the low resistance appears concave and the high polarization appears convex.

[0126] In some embodiments of the present application, an aeromagnetic survey is conducted on the survey coverage area, including conducting an aeromagnetic survey (or collecting aeromagnetic data) on the survey coverage area based on a scale of 1:125,000 or 1:50,000; a high-precision magnetic survey is conducted on the target mining area, including conducting a high-precision magnetic survey on the target mining area based on a scale of 1:10,000; and a near-field source tripole induced polarization survey is conducted on the gold mine target area, including conducting a near-field source tripole induced polarization survey on the gold mine target area based on a scale of 1:5,000. In this way, the survey coverage area can be gradually narrowed, the blindness of the survey can be reduced, and the efficiency of the survey can be improved.

[0127] The following two examples are provided to illustrate the exploration methods for the above-mentioned concealed iron-structure gold deposits:

[0128] Example 1:

[0129] See also Figures 2 to 5In this example, the above-mentioned exploration method for concealed iron-structure gold mines was used to successfully discover the large concealed iron-structure gold mine in Mwamora, Tanzania. The mining area is located in a seasonal swamp area, and the surface is covered by swampy black soil and Quaternary loose sediments. The scale of aeromagnetic measurement is small and the resolution is low. The aeromagnetic anomaly morphology in the working area has poor performance characteristics for banded iron structures. When high-precision magnetic measurement is used, since high-precision magnetic measurement is closer to the magnetic source than aeromagnetic measurement, and the scale is larger and the resolution is higher, the magnetic anomaly of high-precision magnetic measurement reflects its details (such as morphology, scale, direction, etc.) more thoroughly than the anomaly of aeromagnetic measurement.

[0130] Figure 2 The △T magnetic field anomaly plane diagram during high-precision magnetic measurement is shown, where 1 represents the △T magnetic field contour line, 2 represents the magnetic anomaly belt and number, 3 represents the gold vein and number, and 4 represents the mining area. Figure 2 It can be seen that the △T magnetic field anomaly measured by high-precision magnetic force is distributed in a linear beaded shape, with clear boundaries, regular shapes, and high credibility. It more clearly reflects the distribution position, extension direction and scale of the banded iron formation related to the gold mine, showing a good favorable mineralization area. The C1 magnetic anomaly zone and the C2 magnetic anomaly zone are verified by drilling projects. They are caused by banded iron formations (magnetic quartzite) and gold ore bodies. The gold ore bodies and mineralized alteration zones are located on the side of the magnetized quartzite at the contact between the magnetized quartzite and the metamorphic tuff. The M1 gold vein and the M2 gold vein have the same strike as the C1 magnetic anomaly zone and the C2 magnetic anomaly zone, respectively, and are basically parallel. Their length, shape, and extension direction are consistent with the characteristics of the C1 and C2 magnetic anomaly zones, indicating that the magnetic strata (banded iron formation) in this embodiment are closely related to the gold ore body or mineralized alteration zone.

[0131] Figure 3 The figure shows the comparison of the apparent polarizability anomaly in the near-field source tripole induced polarization measurement and the △T magnetic field anomaly in the high-precision magnetic measurement, where (a) is the plane diagram of the apparent polarizability anomaly in the near-field source tripole induced polarization measurement, and (b) is the plane diagram of the △T magnetic field anomaly in the high-precision magnetic measurement. Figure 3 It can be seen that the apparent polarizability anomaly in the near-field source tripole induced polarization measurement is banded and distributed in a nearly north-south direction, which is consistent with the "strong negative magnetic field" feature of the △T magnetic field anomaly in the high-precision magnetic measurement, indicating that the two are homologous anomalies, avoiding multiple solutions, further supporting and explaining the morphology, direction, position and scale of the banded iron structure, and the high polarizability range corresponds very well to the distribution of banded iron-bearing structures and veins, indicating that the near-field source tripole induced polarization measurement anomaly in this embodiment can reflect the distribution characteristics of banded iron structures, gold veins or mineralized alteration zones.

[0132] Figure 4The diagram shows the parameter anomaly profile of the near-field source tripole induced polarization measurement, where (a) represents the △T magnetic field anomaly curve of high-precision magnetic measurement; (b) represents the apparent resistivity and apparent polarizability curves in the near-field source tripole induced polarization measurement; (c) represents the apparent metal factor and apparent induced polarization curves in the near-field source tripole induced polarization measurement. Figure 4 It can be seen that the apparent resistivity, apparent polarizability, apparent metallic factor and apparent induced resistivity anomaly measured by near-field source tripole induced polarization can reflect the distribution characteristics of banded iron structures, gold veins or mineralized alteration zones.

[0133] Figure 5 The comprehensive cross-section of time-domain induced polarization sounding is shown, where 1 represents the Quaternary loose residual slope deposits and swamp black soil; 2 represents the upper part of the Neoarchean Nyanzian Group; 3 represents the lower part of the Neoarchean Nyanzian Group; 4 represents the gold ore body and number; 5 represents the drill hole and number; 6 represents the inferred anticline structure; 7 represents the geological boundary; (a) represents the cross-section of the apparent resistivity anomaly of induced polarization sounding; (b) represents the cross-section of the apparent polarizability anomaly of induced polarization sounding; (c) represents the geological section. Figure 5 It can be seen that the positions of the low-resistance (concave) anomaly of apparent resistivity and the high-polarization (convex) anomaly of apparent polarizability in the time domain induced polarization sounding measurement correspond well, indicating that the banded iron-bearing structure and the gold ore body have low-resistance and high-polarization electrical properties and induced polarization characteristics, and the drilling results are consistent with the induced polarization anomaly. The induced polarization anomaly characteristics are consistent with the two-wing morphology of the inverted anticline formed by the iron-bearing structure and the gold ore body, indicating that the combined characteristics of the two parameter changes of the apparent resistivity and apparent polarizability of the induced polarization sounding in this embodiment can locate the iron-bearing structure and the gold ore body in underground space.

[0134] Example 2:

[0135] See also Figure 6 and Figure 7 In this example, the above-mentioned exploration method for concealed iron-structure gold mines was used to successfully discover the medium-sized concealed iron-structure gold mine in Tanzania PL10957 (formerly PL9110). The surface of the mining area is covered by Quaternary residual slope deposits, and the same observation accuracy, working parameters, measurement methods and data processing technology as those of the Mwamola gold mining area were used.

[0136] Figure 6 The △T magnetic field anomaly plane diagram during high-precision magnetic measurement is shown, where 1 represents the magnetic anomaly contour line; 2 represents the gold vein and number; 3 represents the magnetic anomaly belt and number. Figure 6It can be seen that the high-precision magnetic measurement △T magnetic anomaly is strong, the gradient changes greatly, and is mainly accompanied by positive and negative △T anomalies, which is consistent with the north-positive and south-negative magnetic field structure in the low-latitude area of ​​the southern hemisphere. The anomaly shows an obvious northwest-trending belt-like distribution feature, which is basically consistent with the stratigraphic and structural directions in the area. According to the anomaly distribution shape and magnetic field structure (north positive and south negative), the anomaly is divided into six narrow and long magnetic anomaly belts (numbered respectively: C1, C2, C3, C4, C5, and C6). The magnetic anomaly intensity in the northern part of the mining area is higher than that in the southern part, reflecting that the iron formation and gold veins in the north are shallowly buried, while those in the south are deeper. Due to the high intensity, large scale and regular anomaly of the C3 and C5 magnetic anomaly zones in the north, preliminary drilling verification has been carried out in recent years, and gold mineralized alteration zones M1 and M2 have been discovered. The strike of the two mineralized alteration zones is consistent with the magnetic anomaly zones, extending about 2.5 km along the strike, and separated by a fault. Like the Mwamola gold mine, the mineralized alteration zones are produced at the contact between BIF and metatuff (on the side of the magnetite quartzite), but the veins in the two mining areas have different inclinations. The PL9110 mining area is inclined to the northeast (west of the Mwamola gold mine), with a nearly vertical inclination. The width of the mineralized alteration zone is 3 to 10 m, with a maximum grade of 12 g / t. M1 and M2 provide about 10 tons of (332) + (333) gold metal resources.

[0137] Figure 7 The comprehensive exploration profile is shown, among which (a) represents the ground high-precision magnetic survey profile; (b) represents the near-field source tripole induced polarization profile; (1) represents the geological profile and the apparent resistivity cross-section of induced polarization. 1 represents magnetite quartzite; 2 represents metamorphic tuff; 3 represents the geological boundary; 4 represents the shear structural zone and number; 5 represents the gold ore body and number; 6 represents the Quaternary residual slope deposit. Figure 7 It can be seen that corresponding to the location of the iron structure and gold vein, the ground high-precision magnetic measurement △T magnetic field anomaly shows a strong negative magnetic field, and the near-field source tripole induced polarization measurement and time domain induced polarization sounding show abnormal characteristics of low resistivity and high polarizability.

[0138] Embodiment 2:

[0139] The embodiment of the present application provides an exploration device for a concealed iron structure type gold mine, and adopts an exploration method for a concealed iron structure type gold mine provided in any one of the above-mentioned embodiments 1, including:

[0140] Aerial magnetic measurement equipment, used to conduct aeromagnetic measurement of the survey coverage area;

[0141] Proton magnetometer, used to conduct high-precision magnetic measurement of the target mining area and obtain magnetic measurement data within the target mining area;

[0142] A near-field source three-pole induced polarization measurement device is used to perform near-field source three-pole induced polarization measurement on the gold mine target area and obtain near-field source induced polarization measurement data of the gold mine target area;

[0143] The symmetrical quadrupole sounding device is used to perform time domain induced polarization sounding on shallow mineralized rock layers or mineralized zones to obtain sounding data of shallow mineralized rock layers or mineralized zones.

[0144] The beneficial effects of the second embodiment of the present invention and its various implementations can be analyzed by referring to the beneficial effects of the first embodiment and its various implementations, and will not be described in detail here.

[0145] In some embodiments of the present application, the near-field source tripole induced polarization measuring device includes an A pole, an M pole and an N pole, the spacing between the A pole and the M pole of the near-field source tripole induced polarization measuring device is 10m, and the distance between the M pole and the N pole of the near-field source tripole induced polarization measuring device is 90m; the symmetrical quadrupole sounding device includes an A pole, an M pole, an N pole and a B pole, the distance between the A pole and the B pole of the symmetrical quadrupole sounding device is a minimum of 3m and a maximum of 2000m, and the distance between the M pole and the N pole of the symmetrical quadrupole sounding device is one of 0.5m, 3m, 15m and 50m. In this way, the near-field source tripole induced polarization measuring device can be used to realize the near-field source tripole induced polarization measurement, and the symmetrical quadrupole sounding device can be used to realize the time domain induced polarization sounding, thereby improving the exploration efficiency of the exploration device for the hidden iron structure type gold mine.

[0146] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0147] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0148] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A method for prospecting concealed iron-structured gold deposits, characterized in that: include: Conduct aeromagnetic surveys of the surveyed areas or collect regional aeromagnetic data to select target mining areas; Performing high-precision magnetic measurement on the target mining area to obtain magnetic measurement data in the target mining area, and delineating a gold target area in the target mining area according to the magnetic measurement data; Performing near-field source three-pole induced polarization measurement on the gold mine target area to obtain near-field source induced polarization measurement data of the gold mine target area, and delineating shallow mineralized rock layers or mineralized zones in the gold mine target area according to the near-field source induced polarization measurement data; Performing time domain induced polarization sounding on the shallow mineralized rock layer or the mineralized zone to obtain sounding data of the shallow mineralized rock layer or the mineralized zone; Based on the bathymetric data, the enrichment zones of deep underground magnetic minerals and sulfides are delineated, and the hidden iron-structured gold mines are located.

2. The method for prospecting a concealed iron-structured gold mine according to claim 1, characterized in that: The high-precision magnetic measurement of the target mining area includes: Perform performance verification of stability, noise level and consistency of high-precision magnetic measuring instruments; The high-precision magnetic measuring instrument is used to measure the gradient of the weak magnetic strata in the target mining area to determine the base point and the daily variation observation point; The high-precision magnetic meter is used to perform daily variation measurement at the base point, wherein the magnetic field value is collected every 10 seconds, and the basic magnetic field value of the base point is obtained by calculating the arithmetic mean of all magnetic field values ​​within two hours; Performing reliability testing on the measurement data of the high-precision magnetic measuring instrument; The difference between the total magnetic field intensity modulus and the normal field total magnetic field intensity modulus ΔT magnetic field anomaly is calculated, and the difference between the total magnetic field intensity modulus and the normal field total magnetic field intensity modulus ΔT magnetic field anomaly satisfies the following formula: △T=T i +△T h +△T0-T0 Among them, △T magnetic field anomaly is the projection value of the total magnetic field anomaly in the direction of the normal geomagnetic field, T i is the measured magnetic field value of the measuring point after being corrected for diurnal variation, △T h is the height correction value of the measuring point, △T0 is the normal field correction value of the measuring point, and T0 is the basic magnetic field value of the base point.

3. The method for prospecting concealed iron-structured gold mines according to claim 2, characterized in that: Delineating a gold target area in the target mining area according to the magnetic measurement data includes: The ΔT magnetic field anomaly is subjected to filtering processing, polarization processing and extension processing respectively, so as to draw a ΔT magnetic field anomaly map, a polarization anomaly map and an extension map; Based on the ΔT magnetic field anomaly map, polarization anomaly map and extension map, the location and extension direction of the strip iron structure are inferred, and an inferred interpretation map is drawn. Based on the inferred interpretation map, the gold target area is delineated in the target mining area.

4. The method for prospecting concealed iron-structured gold mines according to claim 1, characterized in that: The performing near-field source three-pole induced polarization measurement on the gold mine target area to obtain near-field source induced polarization measurement data of the gold mine target area includes: Establishing an underground direct current electric field, using a near-field source three-pole induced polarization measurement device to measure the gold mine target area, and obtaining the apparent resistivity and apparent polarizability of each measuring point in the gold mine target area; Performing reliability testing on the measurement data of the near-field source three-pole induced polarization measurement device; According to the apparent resistivity and apparent polarizability of each measuring point in the gold target area, the apparent metal factor is calculated by the first formula, and the apparent induced polarization rate is calculated by the second formula; The first formula is: s =η s / ρ s ×10 -4 ; The second formula is: G s =η s *ρ s ; Among them, J s Depending on the metal factor, G s is the apparent electroresonance, η s is the apparent polarizability, ρ s is the apparent resistivity.

5. The method for prospecting concealed iron-structured gold mine according to claim 1, characterized in that: Delineating shallow mineralized rock layers or mineralized zones in the gold mine target area according to the near-field source induced polarization measurement data includes: According to the apparent metallic factor, apparent induced electrical conductivity, apparent polarizability and apparent resistivity of each measuring point in the gold target area, the Kriging data grid method is used to draw contour line plane diagrams or cross-sectional diagrams of the apparent metallic factor, apparent induced electrical conductivity, apparent polarizability and apparent resistivity respectively; According to the contour plan or profile of the apparent metallic factor, apparent induced resistivity, apparent polarizability and apparent resistivity, the shallow mineralized rock layer or mineralized zone is delineated in the gold target area.

6. The method for prospecting concealed iron-structured gold mines according to claim 1, characterized in that: The performing time domain induced polarization sounding on the shallow mineralized rock layer or the mineralized zone to obtain sounding data of the shallow mineralized rock layer or the mineralized zone includes: Using a symmetrical quadrupole sounding device to perform time domain induced polarization sounding on the shallow mineralized rock layer or the mineralized zone to obtain the apparent resistivity and apparent polarizability of each deep measuring point in the shallow mineralized rock layer or the mineralized zone; Before the symmetrical quadrupole sounding device performs sounding, a water locking treatment is performed on the grounding point of the electrodes of the symmetrical quadrupole sounding device; Before the symmetrical quadrupole sounding device performs sounding, a current stability test is performed on the first starting pole distance and the last ending pole distance of each sounding point; Acquire measurement data of each measuring point, and if the measurement data of the current measuring point changes abnormally, rearrange the electrodes of the symmetrical quadrupole sounding device, and change the power supply current of the symmetrical quadrupole sounding device to perform repeated measurements for multiple times; The reliability of the measurement data of the symmetrical quadrupole sounding device is tested.

7. The method for prospecting concealed iron-structured gold mines according to claim 1, characterized in that: The method of delineating the enrichment zone of deep underground magnetic minerals and sulfides according to the bathymetric data and locating the concealed iron-structured gold mine includes: According to the apparent resistivity and apparent polarizability of each depth measurement point in the shallow mineralized rock layer or the mineralized zone, a two-dimensional cross-sectional diagram of the apparent resistivity and the apparent polarizability is drawn respectively by using a Kriging data grid method; Based on the two-dimensional cross-sectional diagram of apparent resistivity and apparent polarizability, the enrichment zone of deep underground magnetic minerals and sulfides is delineated, and the hidden iron-structured gold mine is located.

8. The method for prospecting concealed iron-structured gold mine according to claim 1, characterized in that: The said conducting aeromagnetic survey of the survey coverage area includes conducting aeromagnetic survey of the survey coverage area based on a scale of 1:125,000 or 1:50,000; The high-precision magnetic measurement of the target mining area includes performing high-precision magnetic measurement of the target mining area based on a scale of 1:10,000; The near-field source tripole induced polarization measurement of the gold mine target area includes performing near-field source tripole induced polarization measurement of the gold mine target area based on a scale of 1:5 thousand.

9. An exploration device for concealed iron structure gold mine, characterized in that: The method for prospecting a concealed iron-structured gold mine according to any one of claims 1 to 8 comprises: Aerial magnetic measurement equipment, used to conduct aeromagnetic measurement of the survey coverage area; A proton magnetometer, used to perform high-precision magnetic measurement on the target mining area and obtain magnetic measurement data in the target mining area; A near-field source three-pole induced polarization measurement device is used to perform near-field source three-pole induced polarization measurement on the gold mine target area to obtain near-field source induced polarization measurement data of the gold mine target area; A symmetrical quadrupole sounding device is used to perform time domain induced polarization sounding on the shallow mineralized rock layer or the mineralized zone to obtain sounding data of the shallow mineralized rock layer or the mineralized zone.

10. The exploration device for concealed iron structure gold mine according to claim 9, characterized in that: The near-field source three-pole induced polarization measuring device comprises an A pole, an M pole and an N pole, the distance between the A pole and the M pole of the near-field source three-pole induced polarization measuring device is 10m, and the distance between the M pole and the N pole of the near-field source three-pole induced polarization measuring device is 90m; The symmetrical quadrupole sounding device comprises pole A, pole M, pole N and pole B. The distance between pole A and pole B of the symmetrical quadrupole sounding device is at least 3m and at most 2000m. The distance between pole M and pole N of the symmetrical quadrupole sounding device is one of 0.5m, 3m, 15m and 50m.

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