研究区水系采样点的分布和编号见图11。挖金沟上最上游采样点为2号点，最

The distribution and numbering of sampling points in the water system of the study area are shown in Figure 11. The most upstream sampling point on Digjin Ditch is Point 2, and the most downstream sampling point where it meets the Yabi River is Point 16. Sampling point No. 8 is located at the upper reaches of the seabed trench, and point 17 is located at the junction of the lower reaches of the seabed trench and the Yabi River. Sampling points No. 11 and No. 18 are located at the junction of the upper and lower reaches of Jianglanggou and the Yaxi River, respectively. <br>The results are shown in histogram 12. The figures all show that the content of Cu, Zn, Cr, Ag, Ni and other metal elements in water system sediments is higher than that of other metal elements. <br>The content value of No. 2 point in the upstream of Digging Ditch was higher than that of No. 16; the content of Cu element in No. 8 sampling point of the upstream of Haihaigou was higher than that of No. 17. As shown in Figure 13 <br>, the Cu element content at point 11 in the upper reaches of Jianglanggou is higher than that at point 18. It also shows that Cu element in the sediments of the river system is easier to be enriched in the upper reaches of the basin. As shown in Figure 14, <br><br>according to the interpolation results of the Cu element content in the water samples of the mining area, the 6 small watersheds and buffer areas of the mining area are respectively superimposed to obtain the specific distribution of the small watersheds and buffer areas of the mining area, as shown in Figure 15. <br>Comparing the abundance value of No. 1 area in the upstream of Diijinggou with the No. 5 area in the downstream, the abundance value of No. 5 area is much larger than that of No. 1. Compared with the data of No. 2 in the upstream of Haihaigou, the abundance value of No. 6 in the downstream area is higher than that of No. 2. The No. 3 area in the upper reaches of Jianglanggou is located in the downstream of the main mining area, and the abundance value of Cu is greater than that of No. 7 in the downstream. The abundance value of No. 7 in the upper reaches of Yaxi River is greater than that of No. 5 in the lower reaches. It shows that the metal elements in the water system are easier to be enriched in the upstream of the water system. As shown in Figure 16, the <br>above methods were used to count the maximum, minimum, standard deviation, mean and abundance values ​​of Cu element content in each small watershed and buffer zone. The specific results are shown in Table 9. <br>According to the interpolation results of the Cu element content in the soil samples collected in the mining area, the 6 small watersheds and buffer areas in the mining area are respectively superimposed to obtain the specific distribution of the small watersheds and buffer areas in the mining area, as shown in Figure 17. <br>Use the above methods to count the maximum, minimum, standard deviation, mean and abundance values ​​of Cu element content in each small watershed and buffer zone. As shown in Figure 18.<br>A total of 10 soil samples were collected in this study, and the number and distribution of the sampling points are shown in Figure 19. Analyze and test the element content in each sample. It can be seen from the figure that the content of Cu, Zn, Cr and other elements in the soil is higher than that of other metal elements, and the pH content of points with higher Cu element content is relatively lower. The content of Cu, Zn and other elements in the No. 4 sampling point upstream of the seabed trench should be less than the No. 8 point, and the No. 5 point should be less than the No. 10 point. The Cu element content of No. 2 point in the upper reaches of Jianglanggou is lower than No. 9 point. The element content of No. 9 point in the upper reaches of Yaxi River is less than that of No. 8 point in the lower reaches. It shows that the metal elements in the soil are easier to accumulate in the lower reaches of the water system in the lower-lying areas. The pollution of metal elements in the development of mineral resources will cause soil acidification pollution. <br>According to the land use classification result file in 2019, the land use classification file is cropped using the scope of each small watershed and buffer zone to obtain the land surface coverage of each buffer zone and relatively small watershed, as shown in Figure 20 at the <br>micro-scale The analysis of the impact of mineral resource development on land use can be based on buffer zones and small watersheds. As shown in Figure 21

The distribution and number of water sampling points in the study area are shown in Figure 11. The most upstream sampling point on the gold trench is point 2 and the bottom reaches meet the Yabi River at point 16. Sampling point 8 is located in the upper reaches of the submarine ditch, and point 17 is located in the lower reaches of the submarine ditch and at the intersection of the Yabi River. The sampling points Nos. 11 and 18 are located in the upper and lower reaches of The River Longgou and at the confluence of the Yassin River, respectively.<br>The results are shown in histogram 12. The figures show that the content of metals such as Cu, Zn, Cr, Ag, Ni and other metal elements in water sediments is higher than that of other metal elements.<br>The content value of point 2 in the upper reaches of the trench is higher than that of point 16; The content of Cu element in the upper reaches of the submarine ditch is higher than that of point 17. As shown in Figure 13<br>The content of Cu element in point 11 in the upper reaches of Jianglanggou is higher than that of point 18, which also shows that cu elements in water system sediments are more likely to be abundant in the upper reaches of the basin. As shown in Figure 14<br><br>According to the interpolation results of the water sample Cu element content in the mining area, six small basins and buffer zones of the mining area are superimposed respectively, and the specific distribution of the small basin and buffer zone of the mining area is obtained, as shown in Figure 15.<br>Compared with the downstream area 5, the abundance value of area 5 is much larger than that of area 1. Compared with the downstream 6, the data of the upper reaches of the submarine ditch 2 are higher than the abundance value of area 6 downstream. The upper reaches of Jianglanggou Area 3 are located in the lower reaches of the mining area, and Cu's abundance value is greater than downstream No. 7. The abundance value of No. 7 in the upper reaches of the Yasu River is greater than that at No. 5 downstream. It is explained that the metal elements in the water system are easier to enrich in the upper reaches of the water system. As shown in Figure 16<br>Using the above methods to count the maximum, minimum, standard deviation and mean and abundance values of Cu element content in each small basin and buffer, the results are shown in Table 9.<br>According to the interpolation results of cu element content in soil samples collected in mining areas, six small basins and buffer zones in mining areas are superimposed, and the specific distribution of small basins and buffer zones in mining areas is obtained, as shown in Figure 17.<br>The maximum, minimum, standard deviation, and mean and abundance values of Cu element content in each small basin and buffer are counted using the above methods. Figure 18.<br>A total of 10 soil samples were collected in this study, and the number and distribution of sampling points are shown in Figure 19. The element content in each sample is analyzed and tested. As can be seen from the figure, the content of Cu, Zn, Cr and other elements in the soil is higher than that of other metal elements, and the point pH content of Cu element content is relatively low. The content of cu, Zn and other elements in the upper reaches of the submarine ditch should be less than point 8 and point 5 should be less than point 10. The Cu element content of point 2 in the upper reaches of Jianglanggou is lower than that of point 9. The element content of point 9 in the upper reaches of the Yasu River is smaller than that of point 8 downstream. It is shown that the metal elements in the soil are more likely to be concentrated in the lower reaches of the water system and in the lower reaches of the soil. Metal pollution in mineral resources development can cause acidification pollution of soil.<br>According to the 2019 LAND Use Classification Results Document, the land use classification documents are tailored to the extent of each small basin and buffer zone, resulting in surface cover for each buffer zone and relatively small basin, as shown in Figure 20<br>The analysis of the impact of microscale mineral resources development on land use can be buffer zone and small basin as units. As shown in Figure 21

The distribution and number of water system sampling points in the study area are shown in Figure 11. The upstream sampling point of diaojingou is No.2, and the downstream sampling point is No.16 at the junction of yabijiang river. No. 8 sampling point is located in the upstream of submarine trench, and No. 17 sampling point is located in the downstream of submarine trench and the intersection of Yabi river. Sampling sites No. 11 and No. 18 are located at the intersection of the upper and lower reaches of jianglanggou and yaxingjiang River respectively.<br>The results are shown in bar chart 12. All the figures show that the contents of Cu, Zn, Cr, Ag, Ni and other metal elements in stream sediments are higher than other metal elements.<br>The content of Cu in No.2 sampling point in the upstream of diaojingou is higher than that in No.16 sampling point; the content of Cu in No.8 sampling point in the upstream of haiyanggou is higher than that in No.17 sampling point. As shown in Figure 13<br>The content of Cu in No. 11 is higher than that in No. 18 in the upper reaches of jianglanggou, which also indicates that Cu in stream sediments is more easily enriched in the upper reaches of the basin. As shown in Figure 14<br>According to the interpolation results of Cu element content of water samples in the mining area, six small watersheds and buffer zones in the mining area are superposed respectively to obtain the specific distribution of small watersheds and buffer zones in the mining area, as shown in Figure 15.<br>The abundance value of area No.1 in the upstream of diaojingou is much higher than that of area No.5 in the downstream. Compared with the data of No. 6 downstream, the abundance of No. 2 upstream is higher than that of No. 2 downstream. The Cu value is higher in the upstream of No.3 langdugou mining area than in the downstream of No.7 langdugou mining area. The abundance value of No.7 in the upper reaches of yaxingjiang river is higher than that of No.5 in the lower reaches. It shows that the metal elements in the water system are easy to be enriched in the upper reaches of the water system. As shown in Figure 16<br>The maximum value, minimum value, standard deviation, mean value and abundance value of Cu element content in each small watershed and buffer zone are calculated by using the above method. The specific results are shown in Table 9.<br>According to the interpolation results of Cu content in soil samples collected from the mining area, six small watersheds and buffer zones of the mining area are superposed respectively to obtain the specific distribution of small watersheds and buffer zones in the mining area, as shown in Figure 17.<br>The maximum value, minimum value, standard deviation, mean value and abundance value of Cu in each watershed and buffer zone were calculated by the above methods. As shown in Figure 18.<br>A total of 10 soil samples were collected in this study. The number and distribution of sampling points are shown in Figure 19. The element content of each sample was analyzed and tested. It can be seen from the figure that the contents of Cu, Zn, Cr and other elements in the soil are higher than other metal elements, and the pH value of the point with higher Cu content is relatively lower. The content of Cu, Zn and other elements in No. 4 sampling point in the upstream of submarine trench is less than that in No. 8 sampling point, and that in No. 5 sampling point is less than that in No. 10 sampling point. The content of Cu in No. 2 is lower than that in No. 9. The element content of point 9 in the upper reaches of Yaxing river is less than that of point 8 in the lower reaches. It shows that the metal elements in the soil are easy to be enriched in the lower reaches of the river system. The pollution of metal elements in the exploitation of mineral resources will cause soil acidification pollution.<br>According to the land use classification result file in 2019, the land use classification file is cut according to the scope of each small watershed and buffer zone, and the surface coverage of each buffer zone and relative small watershed is obtained, as shown in Figure 20<br>The micro scale analysis of the impact of mineral resources development on land use can be divided into buffer zone and small watershed. As shown in Figure 21<br>