A method for delineating copper ore target areas based on geochemical data

Abstract

The present invention relates to the field of geological science and technology, and discloses a method for delineating copper ore target areas based on geochemical data, including determining the area to be measured and conducting surveys and collecting data: determining the area to be measured through satellite map technology, then observing the topography and landforms, and at the same time, collecting the geological background data of the area to be measured; dividing the area to be measured into cells of the same area, dividing it into multiple preliminary screening cells, and then sampling on the cells and obtaining sampling data. Through multiple divisions and screenings, based on multi-source information data of geological landforms, geochemistry, and geophysics, and in cooperation with algorithm formulas and quantitative indicators, the exploration process is analyzed and guided, effectively avoiding subjective assumptions, gradually narrowing the scope of the screening area, and screening out areas with unqualified low mineralization potential, so as to more accurately and scientifically identify and delineate copper ore target areas, improve the accuracy and success rate of exploration, and reduce the risks and costs of later drilling verification.

Description

Technical Field

[0001] The present invention relates to the technical field of geological science, and more specifically discloses a method for delineating copper ore target areas based on geochemical data. Background Art

[0002] With the continuous deepening of global mineral resource development, outcropping ores that are easily discovered and mined on the surface and ore deposits that are easily identified by traditional methods are becoming increasingly scarce. This has made the search for hidden ore bodies and blind ore bodies underground, as well as those mineral resources that are difficult to directly identify due to complex geological conditions, a major challenge and opportunity in the field of mineral exploration. Currently, in the mining industry, the determination of porphyry copper ore exploration target areas at a large regional scale (≥10,000 square kilometers) mainly relies on the study of regional metallogenic belts. The study of regional metallogenic belts is based on different metallogenic models and requires a large amount of detailed ore deposit dissection research to reveal the metallogenic laws of the metallogenic belts. At the same time, such research depends on the experience accumulation of researchers and is highly subjective, unable to accurately and scientifically identify and delineate copper ore target areas, thereby reducing the accuracy and success rate of exploration. Summary of the Invention

[0003] The present invention mainly provides a method for delineating copper ore target areas based on geochemical data, which can solve the problem that traditional regional metallogenic belt studies, based on different metallogenic models, require a large amount of detailed ore deposit dissection research to reveal the metallogenic laws of the metallogenic belts. At the same time, such research depends on the experience accumulation of researchers and is highly subjective, unable to accurately and scientifically identify and delineate copper ore target areas, thereby reducing the accuracy and success rate of exploration.

[0004] To solve the above technical problems, according to one aspect of the present invention, more specifically, a method for delineating copper ore target areas based on geochemical data includes the following steps:

[0005] S1. Determine the area to be measured and conduct surveys and collect data: Determine the area of the area to be measured through satellite map technology, then observe the topography and landforms, and at the same time, collect the geological background data of the area to be measured;

[0006] S2. Conduct a preliminary division and screening of the area to be measured: Divide the area to be measured into cells of the same area, divided into multiple initially screened cells, then sample on the cells and obtain sampling data, analyze the data, and retain the areas of the initially screened cells with qualified analysis results;

[0007] S3. Conduct a secondary division and re-screening of the areas qualified in the preliminary screening: Divide the areas of the initially screened cells with qualified analysis results in S2 into cells of the same area again, divided into multiple re-screened cells, then sample on the cells and obtain sampling data, analyze the data, and retain the areas of the re-screened cells with qualified analysis results;

[0008] S4. Conduct copper ore target area delineation for the areas passing the re-screening: Divide the re-screening cell area with qualified analysis results in S3 into multiple final screening cells for the third time with the same area, then sample on the cells and obtain sampling data, analyze the data, and delineate the copper ore target area for the final screening cell area with qualified analysis results;

[0009] S5. Verify the delineated copper ore target area: The exploration personnel carry drilling equipment, arrange drilling holes in the target area, drill and analyze the delineated copper ore target area to verify the copper ore value in the target area.

[0010] Furthermore, in S3, the area of the primary screening cell area is larger than that of the re-screening cell area, and the area of the re-screening cell area is larger than that of the final screening cell area. During the gradual screening process, the area of the area division gradually decreases.

[0011] Furthermore, in S5, during the process of verifying the copper ore value in the delineated copper ore target area, mainly conduct a detailed analysis of the scale and grade of the copper ore. The larger the scale of the copper ore and the higher the grade of the copper ore, the greater the economic value of the delineated copper ore target area.

[0012] Furthermore, in S1, during the process of observing the topography and geomorphology of the area to be measured, remotely collect and observe the topographic and geomorphic information through drone photography combined with image recognition technology.

[0013] Furthermore, in S2, during the process of initially dividing and screening the area to be measured, based on the collected geological and geomorphic, geochemical, and geophysical information data, comprehensively analyze to obtain a single primary screening cell area that passes the initial screening. If:

[0014]

[0015] It indicates that after comprehensive analysis, the copper mineralization potential of a single primary screening cell area is relatively high, belonging to a qualified single primary screening cell area and retaining it. Among them, α is the primary screening index, S is the total area of the copper ore area to be delineated, M is the number of primary screening cells obtained by dividing the total area S of the copper ore area to be delineated into cells with the same area, M t is the number of sampling points for geochemical data in a single cell among the total number of cells M, is the actual resistivity value detected at the i-th sampling point in a single primary screening cell, is the lower limit value of resistivity anomaly. S1 is the occupied area of the iron cap landform in a single cell out of a total of M cells. S2 is the occupied area of malachitization in a single cell out of a total of M cells. SK is the occupied area of known copper ore in a single cell out of a total of M cells. Cu i is the actual copper element content detected at the i-th sampling point in a single preliminary screening cell, α e is the threshold parameter of the preset preliminary screening index.

[0016] Furthermore, in S3, during the process of re-dividing and re-screening the preliminarily screened qualified area, based on the collected geological landform, geochemistry, and geophysical information data, a single re-screening cell area that passes the re-screening is comprehensively analyzed. If:

[0017]

[0018] it indicates that after comprehensive analysis, the single re-screening cell area has a higher copper mineralization potential and belongs to the qualified single re-screening cell area and is retained. Among them, β is the re-screening index, α is the preliminary screening index, N t is the number of sampling points for geochemical data in a single cell divided by the re-screening after passing the preliminary screening, Cu k is the actual copper element content detected at the k-th sampling point in a single re-screening cell, E k is the actual magnetic field intensity detected at the k-th sampling point in a single re-screening cell, G k is the actual gravity detected at the k-th sampling point in a single re-screening cell, H k is the actual elevation detected at the k-th sampling point in a single re-screening cell, E max is the maximum magnetic field intensity detected in a single re-screening cell, E min is the minimum magnetic field intensity detected in a single re-screening cell, G max is the maximum gravity detected in a single re-screening cell, G min is the minimum gravity detected in a single re-screening cell, H max is the maximum elevation detected in a single re-screening cell, H min is the minimum elevation detected in a single re-screening cell, β e is the threshold parameter of the preset re-screening index.

[0019] Furthermore, in S4, during the process of delineating the copper ore target area in the re-screened qualified area, based on the collected geological landform, geochemistry, and geophysical information data, the copper ore target area is comprehensively delineated. If:

[0020]

[0021] It indicates that after comprehensive analysis, a single final screening cell area has significant copper mineralization potential, belongs to a qualified single final screening cell area and is retained, and then further on-site drilling verification is carried out. Among them, γ is the delineation index, α is the preliminary screening index, β is the re-screening index, Q t is the number of sampling points of geochemical data in a single final screening cell divided after passing the re-screening, Cu r is the actual copper element content detected at the k-th sampling point in a single final screening cell, Au r is the actual gold element content detected at the k-th sampling point in a single final screening cell, Ag r is the actual silver element content detected at the k-th sampling point in a single final screening cell, Mo r is the actual molybdenum element content detected at the k-th sampling point in a single final screening cell, δ Au is the correlation coefficient between gold element and copper element, δ Ag is the correlation coefficient between silver element and copper element, δ Mo is the correlation coefficient between molybdenum element and copper element, Au e is the anomaly lower limit value of gold element content, Ag e is the anomaly lower limit value of silver element content, Mo e is the anomaly lower limit value of molybdenum element content, γ e is the threshold parameter of the preset delineation index.

[0022] The beneficial effect of a copper ore target area delineation method based on geochemical data according to the present invention is as follows: through multiple divisions and screenings (preliminary screening, re-screening, final screening), based on multi-source information data of geological landforms, geochemistry and geophysics, and in cooperation with algorithm formulas and quantitative indicators to analyze and guide the exploration process, subjective judgment is effectively avoided, the screening area range is gradually narrowed, and areas with unqualified low mineralization potential are screened out, so that the copper ore target area can be more accurately and scientifically identified and delineated, the accuracy and success rate of exploration are improved, and the risks and costs of later drilling verification are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below with reference to the drawings and specific implementation methods.

[0024] Figure 1 It is a schematic diagram of the method flow. DETAILED DESCRIPTION OF THE INVENTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other.

[0026] According to one aspect of the present invention, as Figure 1 shown, a method for delineating copper ore target areas based on geochemical data is provided:

[0027] First, determine the area of the area to be measured through satellite map technology, then observe the topography and landforms, and at the same time, collect the geological background information of the area to be measured. Then, divide the area to be measured into cells of the same area, divided into multiple preliminary screening cells, and then sample on the cells and obtain sampling data, analyze the data, and retain the areas of the preliminary screening cells with qualified analysis results. During the process of preliminary division and screening of the area to be measured, based on the collected geological landforms, geochemistry, and geophysical information data, comprehensively analyze the single preliminary screening cell area that is initially screened as qualified. If:

[0028]

[0029] It indicates that after comprehensive analysis, the copper mineralization potential of a single preliminary screening cell area is relatively high, belonging to a qualified single preliminary screening cell area and retaining it. If α < α e It indicates that after comprehensive analysis, the copper mineralization potential of a single preliminary screening cell area is low, belonging to an unqualified single preliminary screening cell area, and it needs to be screened out. Among them, α is the preliminary screening index, S is the total area of the copper ore area to be delineated, M is the number of preliminary screening cells obtained by dividing the total area S of the copper ore area to be delineated into cells of the same area. For example, if the total area S is 10,000 square kilometers and a 10 km × 10 km standard grid is used, then the number of preliminary screening cells M is 100. M t is the number of sampling points for geochemical data in a single cell among the total number of cells M. The sampling points can be randomly arranged or evenly arranged. is the actual resistivity value detected at the i-th sampling point in a single preliminary screening cell. is the lower limit value of resistivity anomaly. S1 is the occupied area of iron cap landform in a single cell among the total number of cells M. S2 is the occupied area of malachitization in a single cell among the total number of cells M. SK is the occupied area of known copper ore in a single cell among the total number of cells M. Cu i is the actual copper element content detected at the i-th sampling point in a single preliminary screening cell. α e is the threshold parameter of the preset preliminary screening index.

[0030] After that, the initially screened cell area with qualified analysis results is divided into cells again with the same area, divided into multiple re-screened cells, then sampling is carried out on the cells and sampling data is obtained, the data is analyzed, and the re-screened cell area with qualified analysis results is retained. During the process of re-dividing and re-screening the initially screened qualified area, based on the collected geological and geomorphic, geochemical, and geophysical information data, the single re-screened cell area that is qualified after re-screening is comprehensively analyzed. If:

[0031]

[0032] It indicates that after comprehensive analysis, the single re-screened cell area has a higher copper mineralization potential, belongs to the qualified single re-screened cell area and is retained. If β < β e It indicates that after comprehensive analysis, the single re-screened cell area has a low copper mineralization potential, belongs to the unqualified single re-screened cell area, and needs to be screened out. Among them, β is the re-screening index, α is the initial screening index, N t is the number of sampling points for geochemical data in the cells divided by the single re-screening after the initially screened qualification. The sampling points can be randomly arranged or evenly arranged. Cu k is the actual copper element content detected at the kth sampling point in a single re-screened cell. E k is the actual magnetic field intensity detected at the kth sampling point in a single re-screened cell. G k is the actual gravity detected at the kth sampling point in a single re-screened cell. H k is the actual elevation detected at the kth sampling point in a single re-screened cell. E max is the maximum magnetic field intensity detected in a single re-screened cell. E min is the minimum magnetic field intensity detected in a single re-screened cell. G max is the maximum gravity detected in a single re-screened cell. G min is the minimum gravity detected in a single re-screened cell. H max is the maximum elevation detected in a single re-screened cell. H min is the minimum elevation detected in a single re-screened cell. β e is the threshold parameter of the preset re-screening index.

[0033] Finally, the re-screened cell area with qualified analysis results is divided into cells for the third time with the same area, divided into multiple final-screen cells, and then sampling is carried out on the cells to obtain sampling data, and the data is analyzed. The final-screen cell area with qualified analysis results is delineated as the copper ore target area. During the process of delineating the copper ore target area in the re-screened qualified area, based on the collected geological and geomorphic, geochemical, and geophysical information data, the copper ore target area is comprehensively delineated. If:

[0034]

[0035] It indicates that after comprehensive analysis, a single final-screen cell area has significant copper mineralization potential, belongs to a qualified single final-screen cell area and is retained. Then, exploration personnel are dispatched to deploy drilling holes in the target area with drilling equipment, and the delineated copper ore target area is drilled and analyzed. The scale and grade of the copper ore are mainly analyzed in detail. The larger the scale of the copper ore and the higher the grade of the copper ore, the greater the economic value of the delineated copper ore target area. If γ < γ e It indicates that after comprehensive analysis, the copper mineralization potential of a single final-screen cell area is low, belongs to an unqualified single final-screen cell area, and needs to be screened out. Among them, γ is the delineation index, α is the primary screening index, β is the re-screening index, Q t is the number of sampling points for geochemical data in the cells divided by a single final-screen after passing the re-screening. The sampling points can be randomly or evenly arranged. Cu r is the actual copper element content detected at the kth sampling point in a single final-screen cell. Au r is the actual gold element content detected at the kth sampling point in a single final-screen cell. Ag r is the actual silver element content detected at the kth sampling point in a single final-screen cell. Mo r is the actual molybdenum element content detected at the kth sampling point in a single final-screen cell. δ Au is the correlation coefficient between the gold element and the copper element. δ Ag is the correlation coefficient between the silver element and the copper element. δ Mo is the correlation coefficient between the molybdenum element and the copper element. Au e is the anomaly lower limit value of the gold element content. Ag e is the anomaly lower limit value of the silver element content. Mo e is the anomaly lower limit value of the molybdenum element content. γ e is the threshold parameter of the preset delineation index.

[0036] Certainly, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples either. Changes, modifications, additions or substitutions made by those of ordinary skill in the art within the scope of the essence of the present invention also fall within the protection scope of the present invention.

Claims

1. A method for delineating copper ore target areas based on geochemical data, characterized in that: The following steps are involved: S1. Determine the area to be tested and conduct survey and data collection: Determine the area to be tested through satellite mapping technology, then observe the topography and geomorphology, and at the same time, collect geological background data of the area to be tested; S2. Preliminary division and screening of the area to be tested: the area to be tested is divided into cells of the same area, into a plurality of preliminary screening cells, and then sampling is performed on the cells to obtain sampling data, the data is analyzed, and the preliminary screening cell areas with qualified analysis results are retained; S3, re-dividing and re-screening the area that has passed the preliminary screening: the primary screening cell area with qualified analysis results in S2 is divided into cells with the same area again, divided into multiple re-screening cells, and then sampling is performed on the cells to obtain sampling data, the data is analyzed, and the re-screening cell area with qualified analysis results is retained; S4, delineating the copper ore target area for the area that has passed the rescreening: dividing the rescreening cell area with qualified analysis results in S3 for the third time with the same area into multiple final screening cells, then sampling is performed on the cells and sampling data is obtained, the data is analyzed, and the copper ore target area is delineated for the final screening cell area with qualified analysis results; S5. Verify the designated copper target area: Exploration personnel carry drilling equipment, arrange drilling holes in the target area, drill and analyze the designated copper target area to verify the value of the copper in the target area.

2. The method for delineating a copper ore target area based on geochemical data according to claim 1, characterized in that: In S3, the area of ​​the primary screening cell region is larger than that of the secondary screening cell region, and the area of ​​the secondary screening cell region is larger than that of the final screening cell region. During the step-by-step screening process, the area of ​​the regional division is gradually reduced.

3. The method for delineating a copper ore target area based on geochemical data according to claim 1, characterized in that: In the above S5, in the process of verifying the value of the copper ore in the delineated copper ore target area, the scale and grade of the copper ore are mainly analyzed in detail. The larger the scale of the copper ore and the higher the grade of the copper ore, the greater the economic value of the delineated copper ore target area.

4. The method for delineating a copper ore target area based on geochemical data according to claim 1, characterized in that: In S1, during the process of observing the topography of the area to be measured, the topography information is remotely collected and observed by using drone photography in combination with image recognition technology.

5. The method for delineating a copper ore target area based on geochemical data according to claim 1, characterized in that: In S2, during the preliminary division and screening of the area to be tested, based on the collected geological, geomorphological, geochemical and geophysical information data, a single preliminary screening unit cell area that is initially qualified is comprehensively analyzed, if: It means that after comprehensive analysis, the copper mineralization potential of a single preliminary screening cell area is high, and it is a qualified single preliminary screening cell area and is retained, where α is the preliminary screening index, S is the total area of ​​the copper mine area to be delineated, M is the total area of ​​the copper mine area to be delineated S, and the number of preliminary screening cells divided into cells with the same area, M t is the number of sampling points for geochemical data in a single cell with a total number of cells M, is the actual resistivity value detected at the i-th sampling point in a single primary screening cell, is the lower limit of resistivity anomaly, S1 is the area occupied by gossan in a single cell out of the total number of cells M, S2 is the area occupied by malachite in a single cell out of the total number of cells M, SK is the area occupied by known copper deposits in a single cell out of the total number of cells M, Cu i is the actual copper content detected at the i-th sampling point in a single primary screening cell, α e It is the threshold parameter of the preset initial screening index.

6. The method for delineating a copper ore target area based on geochemical data according to claim 1, characterized in that: In S3, in the process of re-dividing and re-screening the areas that have passed the preliminary screening, a single re-screening unit cell area that has passed the re-screening is comprehensively analyzed based on the collected geological, geomorphological, geochemical and geophysical information data, if: This means that after comprehensive analysis, the copper mineralization potential of the single rescreening cell area is higher, and it belongs to the qualified single rescreening cell area and is retained, where β is the rescreening index, α is the primary screening index, and N t is the number of sampling points for geochemical data in a single rescreened cell that has passed the preliminary screening, Cu k is the actual copper content detected at the kth sampling point in a single rescreening cell, E k is the actual magnetic field strength detected at the kth sampling point in a single re-screening cell, G k is the actual gravity detected at the kth sampling point in a single rescreening cell, H k is the actual elevation detected at the kth sampling point in a single rescreening cell, E max is the maximum magnetic field strength detected in a single rescreening cell, E min is the minimum magnetic field strength detected in a single rescreening cell, G max is the maximum gravity detected in a single rescreening cell, G min is the minimum gravity detected in a single rescreening cell, H max is the maximum elevation detected in a single rescreening cell, H min is the minimum elevation detected in a single rescreening cell, β e It is the threshold parameter of the preset re-screening index.

7. The method for delineating a copper ore target area based on geochemical data according to claim 1, characterized in that: In S4, in the process of delineating the copper ore target area in the area that has passed the rescreening, the copper ore target area is comprehensively delineated based on the collected geological, geomorphological, geochemical and geophysical information data, if: This means that after comprehensive analysis, the single final screening cell area has significant copper mineralization potential, and it is a qualified single final screening cell area and is retained, and then further field drilling verification is carried out, where γ is the delineation index, α is the primary screening index, β is the re-screening index, and Q t is the number of sampling points for geochemical data in a single final screening unit cell that has passed the rescreening, Cu r is the actual copper content detected at the kth sampling point in a single final screening cell, Au r is the actual gold content detected at the kth sampling point in a single final screening cell, Ag r is the actual silver content detected at the kth sampling point in a single final screening cell, Mo r is the actual molybdenum content detected at the kth sampling point in a single final screening cell, δ Au is the correlation coefficient between gold and copper, δ Ag is the correlation coefficient between silver and copper, δ Mo is the correlation coefficient between molybdenum and copper, Au e is the abnormal lower limit of gold content, Ag e is the abnormal lower limit of silver content, Mo e is the abnormal lower limit of molybdenum content, γ e It is the threshold parameter of the preset circle index.

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