A prospecting method for gold deposits controlled by fault structures in alpine permafrost-covered areas

Abstract

The present invention belongs to the technical field of mineral exploration, and specifically relates to a prospecting method for gold deposits controlled by fault structures in alpine permafrost-covered areas. The prospecting method provided by the present invention is aimed at gold deposits controlled by fault structures in alpine permafrost-covered areas, and a set of working methods including selecting prospecting prospective areas, 1:25,000 stream sediment survey, collection and analysis of remote sensing images, field geological survey, magnetotelluric sounding and deep drilling verification is used. With the goal of gold deposits controlled by fault structures in alpine permafrost-covered areas, through reasonable design of prospecting methods, the specific ore-forming positions of specific gold deposits in the prospecting prospective areas are finally determined, that is, the most favorable positions for gold mineralization, achieving a breakthrough in prospecting for gold deposits controlled by fault structures in alpine permafrost-covered areas. The prospecting method provided by the present invention has the characteristics of being economical and practical, environmentally friendly, highly operable, and having good prospecting effects.

Description

Technical Field

[0001] The present invention belongs to the technical field of mineral exploration, and particularly relates to a prospecting method for gold deposits controlled by fault structures in alpine permafrost-covered areas. Background Art

[0002] The East Kunlun is an important gold-producing area. Through mineral exploration work, gold deposits such as "Dachang", "Kaohuangbei", "Wulonggou", and "Gouli" have been successively discovered in areas with relatively low altitudes on the edge of the Kunlun Mountains. As the mineral exploration work gradually advances towards the hinterland of the Kunlun Mountains, great difficulties have emerged in the gold exploration work, and the prospecting effect is not very satisfactory. The altitude in the hinterland of the East Kunlun is generally above 4000m, with thick gravel flows and permafrost layers developed. No direct prospecting clues can be observed on the surface. Conventional exploration methods such as geophysical exploration (induced polarization profile, magnetic method scanning, etc.), geological profile, geochemical profile, and trench exploration in the past cannot achieve the expected results, cannot effectively locate the favorable ore-forming sections, and cannot be verified by drilling.

[0003] Currently, there is no effective working method for prospecting gold deposits in the high-altitude permafrost-developed areas of the East Kunlun. Summary of the Invention

[0004] The purpose of the present invention is to provide a prospecting method for gold deposits controlled by fault structures in alpine permafrost-covered areas. The prospecting method provided by the present invention is effective in prospecting gold deposits controlled by fault structures in the alpine permafrost area of the East Kunlun, provides technical support for prospecting gold deposits in high-altitude permafrost-developed areas, and can effectively promote the gold prospecting process in the East Kunlun region and similar regions.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] The present invention provides a prospecting method for gold deposits controlled by fault structures in alpine permafrost-covered areas, including the following steps:

[0007] (1) According to the conditions and signs favorable for gold mineralization, select favorable ore-forming sections for gold deposits within the alpine permafrost-covered area to obtain a prospecting scenic area; the conditions and signs favorable for gold mineralization include one or more of the formation environment, fault structure development, and geochemical anomalies of gold elements within the alpine permafrost-covered area that are favorable for gold deposit sites;

[0008] (2) Sample within the prospecting scenic area, conduct 1:25,000 stream sediment surveys on the prospecting scenic area, delineate a 1:25,000 comprehensive anomaly map and a geochemical map according to the results of the 1:25,000 stream sediment surveys, compile a geochemical anomaly map of elements closely related to gold mineralization, and obtain a geochemical anomaly area of elements closely related to gold mineralization;

[0009] Collect the remote sensing image map of the prospecting pre-scenic area, process the remote sensing image map, extract the characteristics of the obtained remote sensing image data, and obtain the remote sensing interpretation linear structure of the prospecting pre-scenic area;

[0010] Select the overlapping area of the geochemical anomaly area and the remote sensing interpretation linear structure as the prospecting target area;

[0011] (3)Conduct field geological surveys on the prospecting target area; the field geological surveys include: defining and dividing the strata, structures, and magmatic rocks in the prospecting target area, determining the lithology distributed in the prospecting target area, the development direction of the structure, and the activity characteristics of the magmatic rock; collecting and analyzing chemical samples of various geological bodies in the prospecting target area to obtain mineralization alteration information, and determining the working position, interval distance, and azimuth of the audio magnetotelluric sounding;

[0012] Collect the lithological physical property specimens in the prospecting target area, statistically analyze the electrical physical property characteristics of the lithological physical property specimens, and determine the distribution of the physical property characteristics of the lithological physical property specimens of various lithologies in the prospecting target area;

[0013] (4)According to the working position, interval distance, and azimuth of the audio magnetotelluric sounding determined in step (3), conduct an audio magnetotelluric sounding profile on the prospecting target area, compile a comprehensive profile map of the prospecting target area after extracting data, determine the low-resistance anomaly area in the profile map, and infer the specific shape of the fracture structure in the prospecting target area based on the low-resistance anomaly area and the distribution of the physical property characteristics of the lithological physical property specimens, and determine the most favorable position for gold mineralization.

[0014] Preferably, in step (4), the resistivity at the lowest point of the low-resistance anomaly area is less than 50ρ / (Ω·M).

[0015] Preferably, in step (3), the collection and analysis of the chemical samples are the collection and analysis of the bedrock outcrops or bricks and stones in the slope deposits in the prospecting target area.

[0016] Preferably, in steps (3) and (4), the interval distance is 200m.

[0017] Preferably, in step (2), the collection is carried out using Landsat 8 OLI and / or Gaofen-2 satellite;

[0018] The processing is carried out using one or more of Envi software, PhotoShop software, and MapGis software.

[0019] Preferably, in step (2), the extraction is carried out using one or more of the supervised classification method, visual interpretation method, feature vector principal component analysis method, density segmentation method, and median filtering method.

[0020] Preferably, in the step (2), the sampled sample is cuttings with a size of 0.178 - 0.85 mm.

[0021] Preferably, the sampling is carried out at a density of 20 per km 2 to collect samples within the prospective ore - finding area; the sampling is carried out to collect 3 - 5 samples within a range of 15 m around the designed sampling points in the prospective ore - finding area and combine them into 1 sample; the sampling depth is 0.3 - 0.5 m.

[0022] Preferably, the elements closely related to gold mineralization include one or more of Au, Ag, As, Sb, Hg, and Bi elements.

[0023] Preferably, after determining the most favorable position for gold mineralization in the step (4), the following steps are further included: (5) arranging drilling at the most favorable position for gold mineralization for verification.

[0024] The present invention provides a prospecting method for gold deposits controlled by fault structures in alpine permafrost-covered areas, which includes the following steps: (1) According to the conditions and signs favorable for gold mineralization, select favorable sections for gold mineralization in the alpine permafrost-covered area to obtain a prospecting prospective area; the conditions and signs favorable for gold mineralization include one or more of the stratigraphic environment favorable for gold deposit sites, developed fault structures, and geochemical anomalies of gold elements in the alpine permafrost-covered area; (2) Sample in the prospecting prospective area, conduct 1:25,000 stream sediment surveys in the prospecting prospective area, delineate a 1:25,000 comprehensive anomaly map and a geochemical map based on the results of the 1:25,000 stream sediment surveys, compile a geochemical anomaly map of elements closely related to gold mineralization, and obtain a geochemical anomaly area of elements closely related to gold mineralization; collect remote sensing image maps of the prospecting prospective area, process the remote sensing image maps, extract the characteristics of the obtained remote sensing image data, and obtain the remotely sensed interpreted linear structures in the prospecting prospective area; select the overlapping area of the geochemical anomaly area and the remotely sensed interpreted linear structures as the prospecting target area; (3) Conduct field geological surveys in the prospecting target area; the field geological surveys include: defining and dividing the strata, structures, and magmatic rocks in the prospecting target area, determining the lithologies distributed in the prospecting target area, the development direction of the structures, and the activity characteristics of the magmatic rocks; collecting and analyzing chemical samples of various geological bodies in the prospecting target area to obtain mineralization alteration information, determining the working positions, interval distances, and azimuths of audio magnetotelluric sounding; collecting lithological physical property specimens in the prospecting target area, statistically analyzing the electrical physical property characteristics of the lithological physical property specimens, and determining the distribution of the physical property characteristics of various lithological physical property specimens in the prospecting target area; (4) According to the working positions, interval distances, and azimuths of audio magnetotelluric sounding determined in step (3), conduct audio magnetotelluric sounding profiles in the prospecting target area, compile a comprehensive profile map of the prospecting target area after data extraction, determine the low-resistance anomaly area in the profile map, and infer the specific morphology of the fault structure in the prospecting target area based on the low-resistance anomaly area and the distribution of the physical property characteristics of the lithological physical property specimens, and determine the most favorable position for gold mineralization. The prospecting method provided by the present invention aims at gold deposits controlled by fault structures in alpine permafrost-covered areas, uses a set of working methods including selecting a prospecting prospective area, 1:25,000 stream sediment surveys, collection and analysis of remote sensing image maps, field geological surveys, and magnetotelluric sounding, and through reasonable prospecting method design, finally determines the mineralization position of specific gold deposits in the prospecting prospective area, that is, the most favorable position for gold mineralization, achieving a breakthrough in prospecting for gold deposits controlled by fault structures in alpine permafrost-covered areas. The prospecting method provided by the present invention has the characteristics of being economically practical, environmentally friendly, highly operable, and having good prospecting effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1Regional geological map of the prospective ore area determined in Example 1 of the present invention;

[0026] Figure 2 Au element geochemical map of the prospective ore area determined in Example 1 of the present invention;

[0027] Figure 3 Remote sensing interpretation structure map of the prospective ore area determined in Example 1 of the present invention;

[0028] Figure 4 Comprehensive geological map of the first prospective ore target area determined in Example 1 of the present invention;

[0029] Figure 5 Comprehensive geological map of the second prospective ore target area determined in Example 1 of the present invention;

[0030] Figure 6 Magnetotelluric sounding profile of Exploration Line 0 in the first prospective ore target area determined in Example 1 of the present invention;

[0031] Figure 7 Magnetotelluric sounding profile of Exploration Line 0 in the second prospective ore target area determined in Example 1 of the present invention;

[0032] Figure 8 Drilling verification profile of Exploration Line 0 in the first prospective ore target area determined in Example 1 of the present invention;

[0033] Figure 9 Drilling verification profile of Exploration Line 0 in the second prospective ore target area determined in Example 1 of the present invention. Detailed implementation method

[0034] The present invention provides a prospecting method for gold deposits controlled by fault structures in alpine permafrost-covered areas, including the following steps:

[0035] (1) According to the conditions and signs favorable for gold mineralization, select favorable sections for gold mineralization in the alpine permafrost-covered area to obtain a prospective ore area; the conditions and signs favorable for gold mineralization include one or more of the formation environment favorable for gold deposit sites, well-developed fault structures, and geochemical anomalies of gold elements in the alpine permafrost-covered area;

[0036] (2) Sample in the prospective ore area, conduct 1:25,000 stream sediment surveys in the prospective ore area, delineate a 1:25,000 comprehensive anomaly map and geochemical map based on the results of the 1:25,000 stream sediment surveys, and compile a geochemical anomaly map of elements closely related to gold mineralization to obtain a geochemical anomaly area of elements closely related to gold mineralization;

[0037] Collect the remote sensing image map of the prospecting pre-scenic area, process the remote sensing image map, extract the characteristics of the obtained remote sensing image data, and obtain the remote sensing interpretation linear structure of the prospecting pre-scenic area;

[0038] Select the overlapping area of the geochemical anomaly area and the remote sensing interpretation linear structure as the prospecting target area;

[0039] (3)Conduct field geological surveys on the prospecting target area; the field geological surveys include: defining and dividing the strata, structures, and magmatic rocks in the prospecting target area, determining the lithology distributed in the prospecting target area, the development direction of the structures, and the activity characteristics of the magmatic rocks; collecting and analyzing chemical samples of various geological bodies in the prospecting target area to obtain mineralization alteration information, and determining the working positions, interval distances, and azimuths of audio magnetotelluric sounding;

[0040] Collect the lithological physical property specimens in the prospecting target area, statistically analyze the electrical physical property characteristics of the lithological physical property specimens, and determine the distribution of the physical property characteristics of the lithological physical property specimens of various lithologies in the prospecting target area;

[0041] (4)According to the working positions, interval distances, and azimuths of the audio magnetotelluric sounding determined in step (3), conduct an audio magnetotelluric sounding profile on the prospecting target area, compile a comprehensive profile map of the prospecting target area after extracting data, determine the low-resistance anomaly area in the profile map, and infer the specific form of the fault structure in the prospecting target area based on the low-resistance anomaly area and the distribution of the physical property characteristics of the lithological physical property specimens, and determine the most favorable position for gold mineralization.

[0042] In the present invention, unless otherwise specified, all preparation raw materials / components are commercially available products well-known to those skilled in the art.

[0043] The present invention selects favorable sections for gold mineralization in the alpine permafrost-covered area according to the conditions and signs favorable for gold mineralization, and obtains the prospecting pre-scenic area; the conditions and signs favorable for gold mineralization include one or more of the formation environment favorable for gold deposit points, developed fault structures, and geochemical anomalies of gold elements in the alpine permafrost-covered area.

[0044] In the present invention, the alpine permafrost-covered area is specifically preferably the East Kunlun alpine permafrost-covered area.

[0045] In the present invention, the present invention preferably selects favorable sections for gold mineralization according to the metallogenic regularity of the East Kunlun area and the 1:200,000 geochemical anomaly map, etc., that is, the discovery of existing gold deposit points in a similar environment, the presence of 1:200,000 geochemical anomalies mainly dominated by the Au element in the area, and the developed fault structures in the area.

[0046] After obtaining the prospecting pre - area, the present invention samples within the prospecting pre - area, conducts a 1:25,000 stream sediment survey in the prospecting pre - area, delineates a 1:25,000 comprehensive anomaly map and a geochemical map based on the results of the 1:25,000 stream sediment survey, compiles a geochemical anomaly map of elements closely related to gold mineralization, and obtains a geochemical exploration anomaly area of elements closely related to gold mineralization.

[0047] Collect the remote sensing image map of the prospecting pre - area, process the remote sensing image map, extract the characteristics of the obtained remote sensing image data, and obtain the remotely sensed interpreted linear structures in the prospecting pre - area.

[0048] Select the overlapping area of the geochemical exploration anomaly area and the remotely sensed interpreted linear structures as the prospecting target area.

[0049] In the present invention, the samples for sampling are preferably rock cuttings with a particle size of 0.178 - 0.85 mm (20 - 60 mesh).

[0050] In the present invention, the sampling is preferably carried out at a density of 20 samples / km 2 to collect samples within the prospecting pre - area.

[0051] In the present invention, the sampling is preferably to collect 3 - 5 samples within a range of 15 m around the designed sampling points in the prospecting pre - area and combine them into 1 sample.

[0052] In the present invention, the sampling depth is preferably 0.3 - 0.5 m.

[0053] In the present invention, the elements closely related to gold mineralization include one or more of Au, Ag, As, Sb, Hg, and Bi elements.

[0054] In a specific embodiment of the present invention, the present invention preferably conducts a 1:25,000 geochemical survey in the prospecting pre - area, delineates geochemical exploration anomalies, compiles geochemical anomaly maps mainly based on gold elements such as Au, Ag, As, Sb, Hg, Bi, etc., and further delineates anomaly sections where each element is relatively well - nested and in a strip - like form.

[0055] After obtaining the prospecting pre - area, the present invention collects the remote sensing image map within the prospecting pre - area, processes the remote sensing image map, extracts the characteristics of the obtained remote sensing image data, and obtains the remotely sensed interpreted linear structures within the prospecting pre - area.

[0056] Select the overlapping area of the geochemical exploration anomaly area and the remotely sensed interpreted linear structures as the prospecting target area.

[0057] In the present invention, the collection is preferably carried out using Landsat 8 OLI and / or Gaofen - 2 satellite.

[0058] In the present invention, the processing is preferably carried out by using one or more of Envi software, PhotoShop software and MapGis software.

[0059] In the present invention, the extraction is preferably carried out by using one or more of supervised classification method, visual interpretation method, principal component analysis method of eigenvectors, density segmentation method and median filtering method.

[0060] After obtaining the ore prospecting target area, the present invention conducts field geological surveys on the ore prospecting target area; the field geological surveys include: defining and dividing the strata, structures and magmatic rocks within the ore prospecting target area, determining the lithology distributed within the ore prospecting target area, the development direction of the structures and the activity characteristics of the magmatic rocks; collecting and analyzing chemical samples of various geological bodies within the ore prospecting target area to obtain mineralization alteration information, and determining the working positions, interval distances and azimuths of audio magnetotelluric sounding.

[0061] Collect lithological physical property specimens within the ore prospecting target area, statistically analyze the electrical physical property characteristics of the lithological physical property specimens, and determine the distribution of the physical property characteristics of the lithological physical property specimens of various lithologies within the ore prospecting target area.

[0062] In the present invention, the collection and analysis of the chemical samples are preferably the collection and analysis of bricks and stones in the bedrock outcrops or colluvial deposits within the ore prospecting target area.

[0063] In the present invention, the interval distance is preferably 200 m.

[0064] The present invention conducts tracing inspections on the geological bodies within the ore prospecting target area to roughly determine the scale, occurrence, etc. of the strata, structures, etc. And search for mineralization alteration information by collecting and analyzing chemical samples, etc. Combining the above work results, determine the specific positions, interval distances, azimuths and other elements of the next step of work.

[0065] The present invention conducts an audio magnetotelluric sounding profile on the ore prospecting target area according to the working positions, interval distances and azimuths of the audio magnetotelluric sounding, extracts data and then compiles a comprehensive profile of the ore prospecting target area, determines the low-resistance anomaly area in the profile, and infers the specific shape of the fracture structure in the ore prospecting target area according to the low-resistance anomaly area and the distribution of the physical property characteristics of the lithological physical property specimens, and determines the most favorable position for gold mineralization.

[0066] In the present invention, the resistivity at the lowest point of the low-resistance anomaly area is preferably less than 50 ρ / (Ω·M).

[0067] The present invention first collects a large number of physical property specimens of all lithologies in the area, measures the physical property parameters of each type of specimen, and statistically obtains the physical property characteristics of different types of rock specimens. Subsequently, audio magnetotelluric sounding profiles are arranged at equal intervals (initially measured at an interval of 200 m for economic efficiency) at the positions determined in the above steps, and low-resistance anomaly sections are delineated on the profiles through data extraction. Combining the physical property characteristics of various types of rocks in the area, the specific shape of the fault structure is inferred through comprehensive analysis, and the most favorable position for gold mineralization is further determined.

[0068] In the present invention, after determining the most favorable position for gold mineralization, the present invention preferably further includes: arranging drilling at the most favorable position for gold mineralization for verification.

[0069] The present invention preferably uses a portable hydraulic drill to arrange drilling at the most favorable position for gold mineralization for verification.

[0070] To further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below in conjunction with the drawings and embodiments, but they cannot be understood as limiting the protection scope of the present invention. Embodiment

[0071] This embodiment will describe the solution of this embodiment in detail in combination with the prospecting example of the Black Sea North Gold Mine in the East Kunlun Mountains:

[0072] The first step is as Figure 1 shown. The main strata distributed in this area are Ordovician - Triassic clastic rocks, which are a set of strata favorable for gold mineralization in the region; the fault structures mainly trending nearly east-west are well developed in the area, and there are local distributions of multi-stage magmatic rocks; through 1:200,000 stream sediment measurement, a large number of geochemical anomalies mainly dominated by gold elements are delineated in the area; based on the above conditions and signs favorable for gold mineralization, a range of about 500 km 2 north of the Black Sea in the East Kunlun Mountains is selected as the prospecting area for prospecting work;

[0073] The second step is to arrange and implement 1:25,000 stream sediment measurement in the above-mentioned prospecting area, and collect samples at an average density of 20 per km 2 ; in order to make the samples representative, 3 - 5 samples are collected within a range of 15 m from the designed sampling points and combined into 1 sample during sampling, the sampling depth is generally between 0.3 and 0.5 m, and the collected medium is rock cuttings between 20 and 60 meshes; using the sample test results, a 1:25,000 comprehensive anomaly map and geochemical map are delineated. As Figure 2 shown, the anomalies of elements closely related to gold mineralization such as Au, Ag, As, Sb, Hg, Bi, etc. are mainly nested, and it is found that there are many anomalies mainly dominated by Au, As, and Hg showing a strip-shaped distribution, laying a foundation for the further delineation of the target area;

[0074] In the third step, in combination with the comprehensive regional geological data, taking advantage of the multi-band and high-resolution characteristics of remote sensing data such as Landsat8 OLI or Gaofen-2, remote sensing images were processed with software such as Envi, Photoshop, or MapGis. Through the analysis of the characteristics of remote sensing image data, linear structure information within the prospecting pre-scenic area was extracted using methods such as supervised classification, visual interpretation, principal component analysis of eigenvectors, density segmentation, or median filtering. As Figure 3 shown, in combination with the geochemical anomalies delineated in the second step, two sections with good overlap between geochemical anomalies and remotely sensed linear structures were selected as prospecting target areas for further exploration in this work;

[0075] In the fourth step, field geological route surveys were carried out for the prospecting target areas determined in the previous step. The strata, structures, magmatic rocks, etc. within the target areas were roughly defined and divided, and the lithology distribution, development direction of structures, and activities of magmatic rocks in the area were basically determined. Through the collection and analysis of a large number of reconnaissance samples (stones collected from bedrock outcrops or colluvial deposits) during the field investigation, the possible gold mineralization range was further narrowed. As Figure 4 and Figure 5 shown, audio magnetotelluric sounding profiles were measured at 200m intervals in the overlapping areas of structures and anomalies in the two target areas;

[0076] In the fifth step, physical property specimens of all lithologies were collected in the two target areas respectively, and the electrical physical property characteristics of various types of lithologies were statistically analyzed. Among them, the highest resistivity was 6869ρ / (Ω·M) for metasomatic feldspar quartz sandstone, and the lowest was 825ρ / (Ω·M) for pyrite-bearing granite. Then, through the audio magnetotelluric sounding profiles in the two target areas, after data extraction, cross-sectional diagrams were compiled. As Figure 6 and Figure 7 shown, low-resistance anomaly areas appeared on the cross-sections and were distributed in bands longitudinally, with the lowest resistivity less than 50ρ / (Ω·M). Through comprehensive analysis, it was inferred that the range with resistivity less than 240ρ / (Ω·M) reflects the range of fault fracture zones, and the range with resistivity less than 150ρ / (Ω·M) is the weakest area in the fault zone and is conducive to gold mineralization, which was designated as the specific location for further verification; the resistivity gradually increases on both sides, reflecting intact geological bodies such as strata and rock masses;

[0077] In the sixth step, for the specific locations delineated in the above steps, portable hydraulic drills were used to verify the 0 exploration lines in the two target areas respectively. As Figure 8 and Figure 9Large-scale gold ore (mineralization) bodies have been outlined at the expected positions of the two shown profiles, achieving a breakthrough in prospecting. At present, 7 tons of gold resources have been submitted in Target Area 1, and 2 tons of gold resources have been submitted in Target Area 2, and the results are further expanding. It is confirmed that the prospecting method of the present invention is effective in the high-altitude permafrost development area and can be further promoted.

[0078] Although the above embodiments have made a detailed description of the present invention, they are only a part of the embodiments of the present invention, rather than all embodiments. Other embodiments can also be obtained based on these embodiments without creative efforts, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A prospecting method for gold deposits controlled by fault structures in alpine permafrost-covered areas, characterized in that, It includes the following steps: (1) Select favorable sections for gold mineralization in the alpine permafrost-covered area according to the conditions and signs favorable for gold mineralization to obtain prospecting scenic areas; the conditions and signs favorable for gold mineralization include one or more of the formation environment favorable for gold deposit sites, developed fault structures, and geochemical anomalies of gold elements in the alpine permafrost-covered area; (2) Sample in the prospecting scenic area, conduct 1:25,000 stream sediment surveys in the prospecting scenic area, delineate 1:25,000 comprehensive anomaly maps and geochemical maps according to the results of the 1:25,000 stream sediment surveys, compile geochemical anomaly maps of elements closely related to gold mineralization, and obtain geochemical anomaly areas of elements closely related to gold mineralization; Collect remote sensing image maps of the prospecting scenic area, process the remote sensing image maps, extract the characteristics of the obtained remote sensing image data, and obtain the remotely interpreted linear structures of the prospecting scenic area; Select the overlapping area of the geochemical anomaly area and the remotely interpreted linear structures as the prospecting target area; (3) Conduct field geological surveys in the prospecting target area; the field geological surveys include: defining and dividing the strata, structures, and magmatic rocks in the prospecting target area, determining the lithology distributed in the prospecting target area, the development direction of the structures, and the activity characteristics of the magmatic rocks; collecting and analyzing chemical samples of various geological bodies in the prospecting target area to obtain mineralization alteration information, determining the working positions, interval distances, and azimuths of audio magnetotelluric sounding; Collect lithological physical property specimens in the prospecting target area, statistically analyze the electrical physical property characteristics of the lithological physical property specimens, and determine the distribution of the physical property characteristics of the lithological physical property specimens of various lithologies in the prospecting target area; (4) According to the working positions, interval distances, and azimuths of the audio magnetotelluric sounding determined in step (3), conduct audio magnetotelluric sounding profiles in the prospecting target area, compile comprehensive profile maps of the prospecting target area after extracting data, determine the low-resistance anomaly areas in the profile maps, and infer the specific morphology of the fault structures in the prospecting target area according to the low-resistance anomaly areas and the distribution of the physical property characteristics of the lithological physical property specimens, and determine the most favorable positions for gold mineralization.

2. The prospecting method according to claim 1, characterized in that In step (4), the resistivity at the lowest point of the low-resistance anomaly area is less than 50 ρ / (Ω·M).

3. The prospecting method according to claim 1, characterized in that In step (3), the collection and analysis of the chemical samples are the collection and analysis of bedrock outcrops or masonry in the slope deposits in the prospecting target area.

4. The prospecting method according to claim 1, characterized in that, In steps (3) and (4), the interval distance is 200 m.

5. The prospecting method according to claim 1, characterized in that, In step (2), the collection is carried out using Landsat 8 OLI and / or Gaofen-2 satellites; The processing is carried out using one or more of Envi software, PhotoShop software, and MapGis software.

6. The prospecting method according to claim 1 or 5, characterized in that, In step (2), the extraction is carried out using one or more of supervised classification methods, visual interpretation methods, eigenvector principal component analysis methods, density segmentation methods, and median filtering methods.

7. The prospecting method according to claim 1, characterized in that In step (2), the samples for sampling are rock chips with a size of 0.178 - 0.85 mm.

8. The prospecting method according to claim 1 or 7, characterized in that The sampling is carried out at a density of 20 samples / km 2 to collect samples within the prospecting scenic area; Samples are collected within a range of 15 m from the designed sampling points in the prospecting scenic area, and 3 - 5 samples are combined into 1 sample. The sampling depth is 0.3 - 0.5 m.

9. The prospecting method according to claim 1, characterized in that, The elements closely related to gold mineralization include one or more of Au, Ag, As, Sb, Hg, and Bi elements.

10. The prospecting method according to claim 1, characterized in that, characterized in that, After determining the most favorable position for gold mineralization in step (4), the following steps are further included: (5) Drilling is arranged at the most favorable position for gold mineralization for verification.

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