Uranium prospecting method

Abstract

The invention discloses a uranium ore prospecting method, and relates to the technical field of prospecting, and the method comprises the steps: determining a sampling range according to the gamma energy spectrum of a target region, and the lithologic characteristics, construction conditions, hydrothermal alteration and uranium mineralization characteristics of a thick and large uranium ore body; sampling is conducted on the earth surface of the sampling range or in an existing drill hole, a sampling analysis result is obtained, and the development part of the thick and large uranium ore body is determined according to the sampling analysis result; carrying out groove exploration engineering in the development part to determine an ore prospecting mark of the thick and large uranium ore body; carrying out magnetotelluric sounding measurement at the position corresponding to the prospecting mark, investigating the address of the rich and thick large ore body, and laying a verification drill hole to check the deep extension condition of the rich and thick large ore body; according to the method, the deep ore-endowed rock development condition, the deep rich and thick large ore body ore control fracture development condition, the deep rich and thick large ore body surrounding rock alteration type and the deep rich and thick large ore body uranium mineralization characteristics are determined, then the working area of drilling construction is screened out, and the prospecting efficiency of the rich and thick large uranium ore body can be improved.

Description

Technical Field

[0001] The present application relates to the field of prospecting technology, and in particular to a method for prospecting uranium ore. Background Art

[0002] Sodium-substituted uranium ore is one of the hydrothermal uranium ore deposits. In the process of increasing exploration of this type of uranium ore, it is found that there are rich and large uranium ore bodies in the ore deposit. Several continuous and stable rich and large uranium ore bodies with true thickness greater than 3m and average grade greater than 0.07% have been found in the mining area. The main characteristics of sodium-substituted uranium ore are obvious control by faults, lens-shaped output, large scale and rich grade. The surface exposure is lens-shaped or irregular, but it is generally developed in sodium-substituted rocks in the clamping area of ​​fault structures. The economic value is far greater than other ore bodies. Although the rich and large uranium ore bodies are developed in the structural-sodium-substituted rock mineralization system like other ore bodies, the rich and large uranium ore bodies have unique mineralization environment, output state and spatial distribution characteristics, and the accuracy of prospecting methods and working means needs to be higher than that of ordinary uranium ore bodies.

[0003] The exploration work of related sodium-replacement-type rich and large uranium ore bodies has the problems of being unsuitable for different mineralization environments, high exploration costs and low efficiency. There is an urgent need for a prospecting method that is suitable for different mineralization environments and has high efficiency. Summary of the invention

[0004] The purpose of this application is to provide a uranium prospecting method that can improve the prospecting efficiency of rich and large uranium ore bodies.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] In a first aspect, the present application provides a uranium prospecting method, comprising:

[0007] The sampling range is determined according to the gamma spectrum of the target area and the lithological characteristics, structural conditions, hydrothermal alteration and uranium mineralization characteristics of the rich and large uranium ore body; the rich and large uranium ore body is a sodium-substituted uranium ore body exceeding a set size;

[0008] Sampling is performed on the surface of the ground or in existing boreholes within the sampling range to obtain sampling analysis results, and the development location of the rich and large uranium ore body is determined according to the sampling analysis results;

[0009] Implementing trenching in the development area to obtain the ore-controlling structural features, ore body alteration type, ore body alteration period, and the difference between the rich and thick uranium ore body and the poor and thin ore body; determining the prospecting signs of the rich and thick uranium ore body according to the ore-controlling structural features, ore body alteration type, ore body alteration period, and the difference between the rich and thick uranium ore body and the poor and thin ore body;

[0010] Conduct magnetotelluric sounding measurement, investigate the address of rich and thick large ore bodies, and arrange verification drilling holes at the positions corresponding to the prospecting marks to verify the deep extension of rich and thick large ore bodies, determine the development of deep ore-bearing rocks, the development of ore-controlling faults in deep rich and thick large ore bodies, the alteration type of surrounding rocks in deep rich and thick large ore bodies, and the uranium mineralization characteristics of deep rich and thick large ore bodies; the deep refers to the position greater than the set depth;

[0011] The working area for drilling construction is screened out based on the development of deep ore-bearing rocks, the development of ore-controlling faults in deep, rich and large ore bodies, the alteration type of surrounding rocks in deep, rich and large ore bodies, and the uranium mineralization characteristics of deep, rich and large ore bodies.

[0012] Optionally, the lithological characteristics are the ore-bearing lithologies of the rich and large uranium ore body; the structural conditions are the fault structural properties and periodic development of the mining area where the rich and large uranium ore is located; hydrothermal alteration is the alteration type and development intensity of the surrounding rocks of the rich and large uranium ore body; and the uranium mineralization characteristics are the energy spectrum content of uranium, thorium and potassium in the rich and large uranium ore body and the development of uranium mineralization.

[0013] Optionally, sampling is performed on the surface of the sampling range or in an existing borehole to obtain sampling analysis results, specifically including:

[0014] Sampling a plurality of samples on the surface or in existing boreholes within the sampling range, obtaining the uranium content of each sample, and determining the ore grade according to the uranium content;

[0015] Conducting rock and mineral identification on each of the samples to determine the ore composition and altered minerals;

[0016] Conducting whole-rock geochemical analysis on each of the samples to determine the source and properties of the ore-bearing hydrothermal fluids;

[0017] Each of the samples is analyzed under an electron probe microscope to obtain the mineral type and occurrence state; the sampling and analysis results include ore grade, ore composition, altered minerals, source of ore-bearing hydrothermal fluids, properties of ore-bearing hydrothermal fluids, mineral type and occurrence state.

[0018] Optionally, the exploration trench of the exploration trench project is oriented perpendicular to the direction of the rock layer or mineral layer, the cross-section of the exploration trench is trapezoidal, and the width of the trench bottom is 0.6 meters.

[0019] Optionally, the depth of the trench bottom penetrating into the bedrock is greater than or equal to 0.3 m and less than or equal to 3 m.

[0020] Optionally, the magnetotelluric sounding measurement is a controllable source audio magnetotelluric sounding measurement.

[0021] Optionally, magnetotelluric sounding measurement is performed at the position corresponding to the prospecting mark, specifically including:

[0022] Conduct magnetotelluric sounding measurements on all lines in the target area; the distance between the measurement points for magnetotelluric sounding measurements on each line is 100m, and the distance between adjacent lines is 100-500m.

[0023] Optionally, magnetotelluric sounding measurement is performed at the position corresponding to the prospecting mark, specifically including:

[0024] Conduct magnetotelluric sounding measurements at the positions corresponding to the prospecting marks to obtain magnetotelluric measurement inversion maps.

[0025] Optionally, a survey of the location of a large and rich ore body is conducted at the location corresponding to the prospecting mark, and verification drilling is arranged to verify the deep extension of the large and rich ore body, specifically including:

[0026] Conduct a 1:10000 survey of the location of a large, rich ore body at the location corresponding to the prospecting mark to obtain a 1:10000 geological survey map;

[0027] Verification drilling is carried out at the positions corresponding to the prospecting marks to verify the deep extension of the rich and large ore bodies and obtain the profile of the exploration line.

[0028] Optionally, determine the development of deep ore-bearing rocks, the development of ore-controlling faults in deep, rich and large ore bodies, the alteration type of surrounding rocks in deep, rich and large ore bodies, and the uranium mineralization characteristics of deep, rich and large ore bodies, including:

[0029] Based on the magnetotelluric survey inversion map, 1:10000 geological survey geological map and exploration line profile map, the development of deep ore-bearing rocks, the development of ore-controlling faults in deep and thick large ore bodies, the alteration type of surrounding rocks in deep and thick large ore bodies and the uranium mineralization characteristics of deep and thick large ore bodies are determined.

[0030] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0031] The present application provides a uranium prospecting method, which determines the sampling range in the target area, determines the development location of the rich and large uranium ore body through sampling, and then determines the prospecting mark, further conducts magnetotelluric sounding measurement, investigates the address of the rich and large ore body, and arranges verification drilling holes to verify the deep extension of the rich and large ore body according to the prospecting mark, selects the working area for drilling construction, realizes the targeted spatial position locking of the rich and large uranium ore body, and improves the prospecting efficiency of the rich and large uranium ore body. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A schematic diagram of a process for uranium prospecting provided in one embodiment of the present application;

[0034] Figure 2 A framework diagram of a uranium prospecting method provided in one embodiment of the present application;

[0035] Figure 3 A geological map of a certain area provided in one embodiment of the present application;

[0036] Figure 4 A profile diagram of an exploration line of a large and rich ore body in a certain area provided in one embodiment of the present application. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0039] This application provides a uranium prospecting method, such as Figure 1 and Figure 2 As shown, the uranium prospecting method includes steps 101 to 105.

[0040] Step 101: Determine the sampling range according to the gamma spectrum of the target area and the lithological characteristics, structural conditions, hydrothermal alteration and uranium mineralization characteristics of the rich and large uranium ore body; the rich and large uranium ore body is a sodium-substituted uranium ore body exceeding a set size.

[0041] Among them, in step 101, the sampling range is an area where the gamma energy spectrum content is three times higher than the average value, the rock type is mineral-bearing breccia, the structure intersects and secondary faults are developed, strong hematization, strong chloritization, strong carbonatization, strong albite alteration are developed, and the surface uranium mineralization is obvious and the scale is greater than the set value.

[0042] Step 102: sampling is performed on the surface of the sampling range or in an existing borehole to obtain sampling analysis results, and the development location of the rich and large uranium ore body is determined according to the sampling analysis results.

[0043] Among them, step 102 is to take samples at the positions with clear number, that is, within the sampling range, and analyze and test to obtain the uranium content of the samples at the clear positions. The positions where the uranium content reaches the industrial grade and is more than three times higher than the average grade are the development positions of the rich and large uranium ore bodies.

[0044] Step 103: Implement trenching in the development area to obtain the ore-controlling structural features, ore body alteration type, ore body alteration period, and the difference between the rich and thick uranium ore body and the poor and thin ore body of the rich and thick uranium ore body; determine the prospecting marks of the rich and thick uranium ore body according to the ore-controlling structural features, ore body alteration type, ore body alteration period, and the difference between the rich and thick uranium ore body and the poor and thin ore body of the rich and thick uranium ore body.

[0045] Step 104: Conduct magnetotelluric sounding measurement, investigate the address of rich and thick large ore bodies, and arrange verification drilling holes at the positions corresponding to the prospecting marks to verify the deep extension of the rich and thick large ore bodies, determine the development of deep ore-bearing rocks, the development of ore-controlling faults in the deep and thick large ore bodies, the alteration type of surrounding rocks in the deep and thick large ore bodies, and the uranium mineralization characteristics of the deep and thick large ore bodies; the deep refers to a position greater than a set depth.

[0046] Step 105: According to the development of deep ore-bearing rocks, the development of ore-controlling faults of deep, rich and large ore bodies, the alteration type of surrounding rocks of deep, rich and large ore bodies, and the uranium mineralization characteristics of deep, rich and large ore bodies, the working area for drilling construction is selected.

[0047] In an exemplary embodiment, before step 101, the uranium prospecting method further includes: collecting relevant data on large and rich sodium-substituted uranium ore bodies, specifically including: a. route geological survey, drilling core logging, and measured profile records of relevant geological observations; b. collating gamma-ray energy spectrum profile and area measurement results and summary reports; c. interpreting remote sensing satellite images of the areas where large and rich sodium-substituted uranium ore bodies are developed, and reporting on the results of sodium-substituted rocks and fault structures.

[0048] Through the above-collected relevant data on the rich and large ore bodies of sodium-substituted uranium ore, the lithological characteristics, structural conditions, hydrothermal alteration and uranium mineralization characteristics related to the rich and large ore bodies of sodium-substituted uranium ore are sorted out.

[0049] The lithological characteristics refer to the ore-bearing lithology of the rich and large uranium ore body; the structural conditions refer to the fault structure properties and period development of the mining area where the rich and large uranium ore is located; hydrothermal alteration refers to the alteration type and development intensity of the surrounding rocks of the rich and large uranium ore body; the uranium mineralization characteristics refer to the energy spectrum content of uranium (U), thorium (Th) and potassium (K) in the rich and large uranium ore body and the development of uranium mineralization.

[0050] In an exemplary embodiment, step 102 specifically includes:

[0051] Sampling is performed on the surface of the sampling range or in existing boreholes to obtain multiple samples, and uranium content analysis is performed to obtain the uranium content of each sample, and the ore grade is determined based on the uranium content.

[0052] The samples are subjected to rock and mineral identification to determine the ore composition and altered minerals, specifically including: preparing the samples into thin sections for rock and mineral identification, mainly observing the ore composition and altered minerals under a microscope.

[0053] Whole-rock geochemical analysis is performed on each of the samples to determine the source and properties of the mineral-bearing hydrothermal fluids, specifically including: whole-rock geochemical analysis of the samples, and mapping the data obtained from the analysis, mainly using R1-R2 diagrams, rare earth element distribution pattern diagrams, trace element spider diagrams, and (Rb-Y+Nb, Ta-Yb) series diagrams to obtain the source and properties of the mineral-bearing hydrothermal fluids.

[0054] Analyze each of the samples under an electron probe microscope to obtain the mineral type and occurrence state, specifically including: preparing an electron probe sheet, analyzing the mineral type and occurrence state under an electron probe microscope, mainly determining the type by the element content in the uranium mineral, and analyzing its occurrence state by observation.

[0055] The sampling and analysis results include ore grade, ore composition, altered minerals, source of ore-bearing hydrothermal fluids, properties of ore-bearing hydrothermal fluids, mineral types and occurrence states.

[0056] In an exemplary embodiment, the trench of the trenching project is perpendicular to the direction of the rock layer or mineral layer, and the length can be determined according to the purpose and geological conditions. The cross section of the trench is trapezoidal, and the width of the trench bottom is 0.6 meters. The depth of the trench bottom into the bedrock is greater than or equal to 0.3m and less than or equal to 3m.

[0057] Step 103 specifically includes: implementing trench exploration at the location where the rich and large uranium ore bodies are developed, recording the occurrence and properties of the ore-controlling structures of the rich and large uranium ore bodies in shallow areas through trench cataloging, recording the alteration types and stages related to the rich and large uranium ore bodies on the surface or in shallow areas, and establishing prospecting markers for the rich and large uranium ore bodies by observing the differences between the rich and large uranium ore bodies revealed by the trenches and other lean and thin ore bodies.

[0058] The specific prospecting signs for determining rich and large uranium ore bodies include: the prospecting signs are formed by observation and statistics, and the locations of the ore-controlling structures where the rich and large ore bodies are generally developed are observed and counted, for example: the intersection of developed structures; the types of alteration developed in the rich and large ore bodies and their successive stages are observed and counted, for example: the development of strong hematization, strong chloritization, strong carbonatization and strong albite alteration, etc.; observing the differences between rich and large ore bodies and poor and thin ore bodies, it is necessary to make it clear that poor and thin ore bodies are also ore bodies, but the thickness, extension and grade of rich and large ore bodies are obviously different from those of poor and thin ore bodies. The grade of rich and large ore bodies is generally more than three times higher than the average grade, and the thickness of the ore bodies and the extension distance along the strike are generally more than twice the average value of the mining area.

[0059] More specifically, geological logging is carried out by geological personnel in a timely manner after the trench construction is terminated, and one wall and one bottom are logged at a scale of 1 / 100. If the geological phenomena of the two walls change greatly, two walls and one bottom are logged. When logging, the trench is first systematically stratified, and the geological phenomena such as the stratification position, stratification lithology, and mineralization are recorded in detail. A 1 / 100 sketch is drawn on site simultaneously. Through the trench logging work, the occurrence and properties of the ore-controlling structures of the rich and large uranium ore bodies in the shallow part are recorded, and the alteration types and periods related to the rich and large uranium ore bodies on the surface or in the shallow part are recorded. Through the observation of the differences between the rich and large uranium ore bodies revealed by the trench and other poor and thin ore bodies, the prospecting signs of the rich and large uranium ore bodies are established.

[0060] In an exemplary embodiment, the magnetotelluric depth measurement is a controlled source audio frequency magnetotelluric depth measurement. Step 104 specifically includes: on the basis of shallow surface construction, further implementing controlled source audio frequency magnetotelluric depth measurement, conducting geological surveys of rich and large ore bodies, laying out lines to determine the surface development scale of rich and large ore bodies, laying out verification drilling holes to verify the deep extension of rich and large ore bodies, and through the above work to observe geological phenomena and analyze geophysical data, it is possible to obtain the development of deep ore-bearing rocks, the development of ore-controlling faults in deep rich and large ore bodies, the alteration type of surrounding rocks in deep rich and large ore bodies, and record the uranium mineralization characteristics of deep rich and large ore bodies.

[0061] Step 105 is to select areas with good mineralization conditions for large and rich uranium ore bodies as key work areas based on the analysis results of step 104, and to conduct intensified drilling construction to control the development of large and rich uranium ore bodies of sodium replacement type in terms of strike and dip.

[0062] Among them, magnetotelluric sounding measurement is carried out at the position corresponding to the prospecting mark, specifically including: magnetotelluric sounding measurement is carried out on each line in the target area; wherein the distance between the measurement points for magnetotelluric sounding measurement on each line is 100m, and the distance between each adjacent line is 100-500m.

[0063] More specifically, based on the shallow surface construction, controlled source audio frequency magnetotelluric sounding measurement is further implemented. Alternating currents of different frequencies are sent underground through a finite length grounding wire current source, and orthogonal electromagnetic field components are measured within a certain range on the ground. The resistivity and impedance phase are calculated to detect geological targets at different buried depths. Controlled source audio frequency magnetotelluric sounding measurement is a frequency domain electromagnetic sounding method, in which the line spacing is 100-500m and the point spacing is 100m.

[0064] Conduct magnetotelluric sounding at the position corresponding to the prospecting mark, specifically including: conduct magnetotelluric sounding at the position corresponding to the prospecting mark to obtain the magnetotelluric inversion map. More specifically, carry out a special geological survey of rich and large ore bodies at a scale of 1:10000, lay out a route line to determine the surface development scale of the rich and large ore bodies, and the layout of the geological observation route should be carefully arranged based on the comprehensive geological sketch compiled after the survey. In mapping, route crossing should be the main method, and tracing should be the auxiliary method. The main route should be combined with the general route to carry out mapping. It is forbidden to mechanically arrange according to the grid or arbitrarily thin out without basis. The layout principle of geological observation points should be that each point has specific geological content. Among them, important geological boundaries and geological bodies, such as the boundaries of groups (rock groups) and sections (rock sections) of rock stratigraphic units, and some meaningful special informal units, should all have sufficient observation points for control.

[0065] Conducting a survey of the location of a large and rich ore body at the location corresponding to the prospecting mark and setting up verification drilling holes to verify the deep extension of the large and rich ore body, specifically including: conducting a 1:10000 survey of the location of a large and rich ore body at the location corresponding to the prospecting mark, and obtaining a 1:10000 geological survey geological map, such as Figure 3 As shown; verification drilling is carried out at the position corresponding to the prospecting mark to verify the deep extension of the rich and large ore body, and a 1:1000 exploration line profile is obtained, as shown Figure 4 According to the magnetotelluric survey inversion map, 1:10000 geological survey geological map and exploration line profile map, the development of deep ore-bearing rocks, the development of ore-controlling faults in deep rich and large ore bodies, the alteration type of surrounding rocks in deep rich and large ore bodies and the uranium mineralization characteristics of deep rich and large ore bodies are determined.

[0066] Figure 3 In the table, 1-16 are respectively, Q represents the Quaternary system; Pt 1 t represents the Tamazigou Formation; Pt 1 b represents Baijiazuizi group; S 1 γ represents the Early Silurian fine-grained granite; O 3 γπ indicates the coarse-grained porphyritic granite of the Late Ordovician; O 3 γ indicates medium-coarse-grained granite of the Late Ordovician; O 1 γ represents the Early Ordovician medium-coarse-grained granite; ∈ 1δ represents the Early Cambrian diorite; δ r represents contaminated diorite; γ π represents sodium metasomatic rock; γ represents granite vein; βμ represents diabase vein; q represents quartz vein; red / represents fracture; blue / represents exploration line; Indicates the scope of the study area.

[0067] More specifically, verification drilling holes are arranged to verify the deep extension of rich and thick large ore bodies. By carrying out the above work, controlled source audio magnetotelluric measurement inversion maps, 1:10000 special geological survey geological maps and exploration line profiles are obtained. Then, geological phenomenon observation and geophysical data analysis are carried out to obtain the development of deep ore-bearing rocks, the development of ore-controlling faults in deep and thick large ore bodies, the alteration type of surrounding rocks in deep and thick large ore bodies, and the uranium mineralization characteristics of deep and thick large ore bodies. Then, sections with good mineralization conditions for rich and thick large uranium ore bodies are selected as key work areas, and intensified drilling construction is carried out along the strike and dip of the rich and thick large ore bodies to control the development of sodium-replacement-type rich and thick large uranium ore bodies.

[0068] The uranium prospecting method of the present application is specifically a prospecting method for sodium-substituted uranium ore rich and large ore bodies. By using the prospecting method of the present application, the spatial position of the sodium-substituted uranium ore rich and large ore body can be targeted. The method can be applied to the prospecting process of sodium-substituted uranium ore under the background of contemporary uranium exploration technology. On the basis of clear goals, the prospecting signs of sodium-substituted uranium ore rich and large ore bodies can be determined, the mineralization conditions of sodium-substituted uranium ore rich and large ore bodies can be summarized, the mineralization potential of rich and large ore bodies can be evaluated, the favorable areas for mineralization of rich and large ore bodies can be predicted, and the spatial position of the ore body can be locked, which improves the prospecting benefits of the exploration work for sodium-substituted uranium ore rich and large ore bodies, greatly improves the prospecting efficiency, shortens the construction period, and saves exploration costs.

[0069] This application makes full use of and gives play to advanced uranium exploration technology based on relatively mature geological data. It is more rigorous in prospecting ideas and more applicable to work areas with different geological characteristics. Due to the existence of advanced exploration technology, the present invention can also be more refined to cope with the challenges brought by different mineralization environments. In short, the present invention is applicable to the field of prospecting technology for rich and large ore bodies of sodium-substituted uranium ore. The prospecting type is basically clear, and it can make full use of modern mature basic geological data. It can also give play to advanced uranium exploration technology. This can not only shorten working time and save exploration costs, but also significantly improve the efficiency of seeing ore.

[0070] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A method for prospecting uranium ore, characterized in that: The uranium prospecting method comprises: The sampling range is determined according to the gamma spectrum of the target area and the lithological characteristics, structural conditions, hydrothermal alteration and uranium mineralization characteristics of the rich and large uranium ore body; the rich and large uranium ore body is a sodium-substituted uranium ore body exceeding a set size; Sampling is performed on the surface of the ground or in existing boreholes within the sampling range to obtain sampling analysis results, and the development location of the rich and large uranium ore body is determined according to the sampling analysis results; Implementing trenching in the development area to obtain the ore-controlling structural features, ore body alteration type, ore body alteration period, and the difference between the rich and thick uranium ore body and the poor and thin ore body; determining the prospecting signs of the rich and thick uranium ore body according to the ore-controlling structural features, ore body alteration type, ore body alteration period, and the difference between the rich and thick uranium ore body and the poor and thin ore body; Conduct magnetotelluric sounding measurement, investigate the address of rich and thick large ore bodies, and arrange verification drilling holes at the positions corresponding to the prospecting marks to verify the deep extension of rich and thick large ore bodies, determine the development of deep ore-bearing rocks, the development of ore-controlling faults in deep rich and thick large ore bodies, the alteration type of surrounding rocks in deep rich and thick large ore bodies, and the uranium mineralization characteristics of deep rich and thick large ore bodies; the deep refers to the position greater than the set depth; The working area for drilling construction is screened out based on the development of deep ore-bearing rocks, the development of ore-controlling faults in deep, rich and large ore bodies, the alteration type of surrounding rocks in deep, rich and large ore bodies, and the uranium mineralization characteristics of deep, rich and large ore bodies.

2. The uranium prospecting method according to claim 1, characterized in that: The lithological characteristics are the ore-bearing lithologies of the rich and large uranium ore bodies; the structural conditions are the nature and periodic development of the fault structures in the mining area where the rich and large uranium ore bodies are located; hydrothermal alteration is the alteration type and development intensity of the surrounding rocks of the rich and large uranium ore bodies; the uranium mineralization characteristics are the energy spectrum contents of uranium, thorium and potassium in the rich and large uranium ore bodies and the development of uranium mineralization.

3. The uranium prospecting method according to claim 1, characterized in that: Sampling is performed on the surface of the ground or in existing boreholes within the sampling range to obtain sampling analysis results, specifically including: Sampling a plurality of samples on the surface or in existing boreholes within the sampling range, obtaining the uranium content of each sample, and determining the ore grade according to the uranium content; Conducting rock and mineral identification on each of the samples to determine the ore composition and altered minerals; Conducting whole-rock geochemical analysis on each of the samples to determine the source and properties of the ore-bearing hydrothermal fluids; Each of the samples is analyzed under an electron probe microscope to obtain the mineral type and occurrence state; the sampling and analysis results include ore grade, ore composition, altered minerals, source of ore-bearing hydrothermal fluids, properties of ore-bearing hydrothermal fluids, mineral type and occurrence state.

4. The uranium prospecting method according to claim 1, characterized in that: The exploration trench of the exploration trench project is perpendicular to the direction of the rock layer or mineral layer. The cross-section of the exploration trench is trapezoidal and the width of the trench bottom is 0.6 meters.

5. The uranium prospecting method according to claim 4, characterized in that: The depth of the trench bottom penetrating into the bedrock is greater than or equal to 0.3 m and less than or equal to 3 m.

6. The uranium prospecting method according to claim 1, characterized in that: The magnetotelluric sounding measurement is a controllable source audio frequency magnetotelluric sounding measurement.

7. The uranium prospecting method according to claim 1, characterized in that: Conducting magnetotelluric sounding measurement at the location corresponding to the prospecting mark specifically includes: Conduct magnetotelluric sounding measurements on all lines in the target area; the distance between the measurement points for magnetotelluric sounding measurements on each line is 100m, and the distance between adjacent lines is 100-500m.

8. The uranium prospecting method according to claim 1, characterized in that: Conducting magnetotelluric sounding measurement at the location corresponding to the prospecting mark specifically includes: Conduct magnetotelluric sounding measurements at the positions corresponding to the prospecting marks to obtain magnetotelluric measurement inversion maps.

9. The uranium prospecting method according to claim 8, characterized in that: Conducting a survey of the location of the rich and large ore body at the location corresponding to the prospecting mark and arranging verification drilling holes to verify the deep extension of the rich and large ore body, specifically including: Conduct a 1:10000 survey of the location of a large, rich ore body at the location corresponding to the prospecting mark to obtain a 1:10000 geological survey map; Verification drilling is carried out at the positions corresponding to the prospecting marks to verify the deep extension of the rich and large ore bodies and obtain the profile of the exploration line.

10. The uranium prospecting method according to claim 9, characterized in that: Determine the development of deep ore-bearing rocks, the development of ore-controlling faults in deep, rich and large ore bodies, the alteration type of surrounding rocks in deep, rich and large ore bodies, and the uranium mineralization characteristics of deep, rich and large ore bodies, including: Based on the magnetotelluric survey inversion map, 1:10000 geological survey geological map and exploration line profile map, the development of deep ore-bearing rocks, the development of ore-controlling faults in deep and thick large ore bodies, the alteration type of surrounding rocks in deep and thick large ore bodies and the uranium mineralization characteristics of deep and thick large ore bodies are determined.

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