Copper ore target area delineation method based on geochemical data

Abstract

The invention relates to the technical field of geological science, and discloses a copper mine target area delineation method based on geochemical data, which comprises the following steps of: determining a to-be-detected area, reconnaissance and data collection: determining the area of the to-be-detected area through a satellite map technology, then observing the landform, and meanwhile, collecting geological background data of the to-be-detected area; the method comprises the following steps of: performing cell division on a to-be-detected region with the same area, dividing the to-be-detected region into a plurality of primary screening cells, and then sampling on the cells and acquiring sampling data; through multiple times of division and screening, the exploration process is analyzed and guided according to geological and landform, geochemistry and geophysics multi-source information data in cooperation with an algorithm formula and a quantitative index, subjective assume is effectively avoided, the range of a screening area is reduced step by step, and unqualified areas with low mineralization potential are screened out. The copper mine target area can be identified and delineated more accurately and scientifically, the exploration accuracy and success rate are improved, and the risk and cost of later drilling verification are reduced.

Description

Technical Field

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

[0002] With the continuous deepening of global mineral resource development, outcrop mines that are easy to find and mine on the surface and ore deposits that are easy to identify by traditional methods are becoming increasingly scarce. This makes the search for hidden mines, blind ore bodies and mineral resources that are difficult to directly identify due to complex geological conditions underground a major challenge and opportunity in the field of mineral exploration. At present, the mining industry mainly determines the exploration target areas of porphyry copper deposits on a large regional scale (≥10,000 square kilometers) based on regional metallogenic belt research. Regional metallogenic belt research is based on different mineralization models and requires a large amount of detailed ore deposit anatomy research to reveal the mineralization laws of the mineralization belt. At the same time, such research relies on the experience accumulation of researchers and is highly subjective. It is impossible to accurately and scientifically identify and delineate copper mine targets, which leads to a decrease in 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 mineralization belt research is based on different mineralization models and requires the use of a large number of detailed ore deposit anatomical studies to reveal the mineralization laws of the mineralization belt. At the same time, such research relies on the experience accumulation of researchers and is highly subjective, making it impossible 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 a copper ore target area based on geochemical data comprises the following steps:

[0005] 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;

[0006] 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;

[0007] 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;

[0008] 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;

[0009] 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.

[0010] Furthermore, in S3, the area of ​​the primary screening cell region is larger than the area of ​​the secondary screening cell region, and the area of ​​the secondary screening cell region is larger than the area of ​​the final screening cell region. During the step-by-step screening process, the area of ​​the regional division is gradually reduced.

[0011] Furthermore, in the S5, in the process of verifying the value of the copper mine in the delineated copper mine target area, the scale and grade of the copper mine are mainly analyzed in detail. The larger the scale of the copper mine and the higher the grade of the copper mine, the greater the economic value of the delineated copper mine target area.

[0012] Furthermore, 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.

[0013] Furthermore, in said S2, in the process of 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:

[0014]

[0015] 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.

[0016] Furthermore, in said S3, in the process of re-dividing and re-screening the areas that have passed the preliminary screening, based on the collected geological, geomorphological, geochemical and geophysical information data, a single re-screening unit cell area that has passed the re-screening is comprehensively analyzed, if:

[0017]

[0018] 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.

[0019] Furthermore, in said 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:

[0020]

[0021] 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.

[0022] The beneficial effect of the copper mine target area delineation method based on geochemical data of the present invention is as follows: through multiple divisions and screenings (primary screening, secondary screening, and final screening), according to geological and geomorphological, geochemical and geophysical multi-source information data, in combination with algorithm formulas and quantitative indicators, the exploration process is analyzed and guided, subjective assumptions are effectively avoided, the screening area is narrowed step by step, and unqualified areas with low mineralization potential are screened out, so that the copper mine target area can be identified and delineated more accurately and scientifically, the accuracy and success rate of exploration are improved, and the risk and cost of later drilling verification are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 1 A schematic diagram of the method flow chart. DETAILED DESCRIPTION

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

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

[0027] First, the area of ​​the area to be tested is determined by satellite map technology, and then the topography is observed. At the same time, the geological background data of the area to be tested is collected. Then, the area to be tested is divided into cells of the same area, divided into multiple preliminary screening cells, and then samples are taken on the cells and the sampling data is obtained. The data is analyzed, and the preliminary screening cell areas with qualified analysis results are retained. In the process of preliminary division and screening of the area to be tested, a single preliminary screening cell area that has passed the preliminary screening is comprehensively analyzed based on the collected geological, geomorphic, geochemical and geophysical information data. If:

[0028]

[0029] This means that after comprehensive analysis, the copper mineralization potential of the single preliminary screening cell area is high, and it belongs to the qualified single preliminary screening cell area and is retained. If α<α e It means that after comprehensive analysis, the copper mineralization potential of a single preliminary screening cell area is low, and it is an unqualified single preliminary screening cell area, which needs to be screened out. Among them, α is the preliminary screening index, S is the total area of ​​the copper mine area to be delineated, and M is the number of preliminary screening cell grids divided into cells with the same area of ​​the total area S of the copper mine area to be delineated. For example, if the total area S is 10,000 square kilometers and a standard grid of 10 kilometers × 10 kilometers is used, the number of preliminary screening cell grids M is 100, and M t is the number of sampling points for geochemical data in a single cell with a total number of cells M. The sampling points can be randomly or evenly arranged. 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.

[0030] After that, the primary screening cell area with qualified analysis results is divided into multiple re-screening cells with the same area, and then sampling is performed on the cells to obtain sampling data, and the data is analyzed, and the re-screening cell area with qualified analysis results is retained. In the process of re-dividing and re-screening the area that has passed the preliminary screening, a single re-screening cell area that has passed the re-screening is comprehensively analyzed based on the collected geological, geomorphological, geochemical and geophysical information data, if:

[0031]

[0032] 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. e This means that after comprehensive analysis, the copper mineralization potential of a single rescreening cell area is low, and it is an unqualified single rescreening cell area, which needs to be screened out. Among them, 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. The sampling points can be randomly or evenly arranged. 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.

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

[0034]

[0035] 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. Then, exploration personnel are dispatched with drilling equipment to arrange drilling holes in the target area, drill and analyze the designated copper target area, and mainly conduct detailed analysis on the scale and grade of the copper mine. The larger the scale of the copper mine, the higher the grade of the copper mine, which means the greater the economic value of the designated copper target area. If γ<γ e This means that after comprehensive analysis, the copper mineralization potential of a single final screening cell area is low, and it is an unqualified single final screening cell area, which needs to be screened out. Among them, 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. The sampling points can be randomly or evenly arranged. 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.

[0036] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope 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 map 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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