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Valley system soils geochemical characteristics and metallogenic prediction of the Yue'e tin polymetallic mining area in Xieng Khouang Province, Laos |
SHI Qi( ), ZHAO Yan-Peng, CHI Zhan-Dong, GE Hua, KANG Tie-Suo, LI Fa-Xing, WEI Xiang-Yu, LU Jian-Kun, YANG Ren-Yi |
China Nonferrous Metals (Guilin) Geology and Mining Co.,Ltd., Guilin 541004, China |
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Abstract The tin-polymetallic mining area of the Yue'e ore district, XiengKhouang Province, Laos, is located in the west of the XiengKhouang Laos-Changshan Vietnam tectonic magmatic belt. Based on the 1:25 000 valley system soil geochemical survey, combined with an analysis of the characteristics of element variation coefficients and concentration coefficients, the correlation of elements, anomaly verification, and gold and other polymetallic ore prospecting potentials, the authors optimized multiple target and prospects areas. The position of the mineralized body was inferred based on geochemical exploration anomalies in key target areas. Through trench verification and drilling engineering verification, good prospecting results were achieved. The area is considered to have copper, tin, lead, zinc, tungsten. It is shown that this method can quickly delineate the prospecting target area and distant scenic area in the thick coverage area and extensive blank research area of Southeast Asian tropical monsoon climate, and can provide an effective basis for the next exploration work.
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Received: 18 May 2020
Published: 20 August 2021
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Ⅰ11—Heishuihe Indosinian rift zone;Ⅰ2—Lanping-Simao-southern Mesozoic depression zone;Ⅱ1—east Indosinian block Majiang-Sangnu Variscan-Indochina arc zone; Ⅱ2—Luang Prabang Variscan fold zone; Ⅱ3—Vientiane(basin)-Kunsong (continental core) block; Ⅱ4—Xieng Khuoang-Changshan Variscan folded belt;① —Yuanjiang-Honghe fault;②—Ailaoshan-Heishuihe fault;③—Amojiang-Majiang suture zone;④—Dianbianfu-Chengyi suture zone;⑤—Puleishan-Mengmei fault;⑥—Lanjiang fault;⑦—Xieng Khuoang-Changshan fault ">
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Location of Yue'e copper polymetallic mining area Ⅰ1—Changdu-Lanping-Simao block Mojiang-Lvchun Variscan-Indosinian fold belt;—Heishuihe Indosinian rift zone;Ⅰ2—Lanping-Simao-southern Mesozoic depression zone;Ⅱ1—east Indosinian block Majiang-Sangnu Variscan-Indochina arc zone; Ⅱ2—Luang Prabang Variscan fold zone; Ⅱ3—Vientiane(basin)-Kunsong (continental core) block; Ⅱ4—Xieng Khuoang-Changshan Variscan folded belt;① —Yuanjiang-Honghe fault;②—Ailaoshan-Heishuihe fault;③—Amojiang-Majiang suture zone;④—Dianbianfu-Chengyi suture zone;⑤—Puleishan-Mengmei fault;⑥—Lanjiang fault;⑦—Xieng Khuoang-Changshan fault
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Simplified geological map and gully point layout of the Yue’e mining area in Xieng Khouang Province, Laos
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参数 | Ag | As | Au | Bi | Co | Cr | Cu | Hg | Mo | Ni | Pb | Sb | Sn | W | Zn | 原始数据 | 平均值Cf1 | 0.091 | 15.40 | 2.13 | 0.52 | 15.10 | 77.70 | 27.90 | 97.40 | 0.79 | 34.60 | 28.00 | 1.79 | 4.90 | 3.66 | 77.50 | | 最小值 | 0.020 | 0.80 | 0.43 | 0.03 | 1.00 | 4.50 | 1.90 | 8.00 | 0.27 | 2.40 | 1.00 | 0.08 | 0.80 | 0.30 | 2.70 | | 最大值 | 0.290 | >1000 | 145 | 20.20 | 89.40 | 363 | 475.30 | >2000 | 10.57 | 239 | 589 | 40.83 | 400 | 64.70 | 2000 | | 标准离差 | 0.067 | 34.10 | 2.82 | 0.52 | 7.50 | 38.80 | 15.40 | 212.19 | 0.61 | 22.60 | 21.10 | 3.00 | 8.40 | 3.93 | 75.70 | | 变异系数Cv1 | 0.74 | 2.21 | 1.32 | 1.00 | 0.50 | 0.50 | 0.55 | 2.18 | 0.77 | 0.65 | 0.75 | 1.68 | 1.71 | 1.07 | 0.98 | 处理后数据 | 平均值 | 0.078 | 6.50 | 1.87 | 0.45 | 14.80 | 73.40 | 26.40 | 50.82 | 0.65 | 30.40 | 25.70 | 0.89 | 4.00 | 2.46 | 65.10 | | 最小值 | 0.020 | 0.80 | 0.43 | 0.05 | 1.00 | 4.50 | 1.90 | 8.00 | 0.27 | 2.40 | 6.50 | 0.08 | 0.90 | 0.49 | 2.70 | | 最大值 | 0.160 | 16.50 | 4.15 | 0.86 | 35.10 | 161 | 56.40 | 122.28 | 1.49 | 70.80 | 45.10 | 1.85 | 7.10 | 4.43 | 137 | | 标准离差 | 0.027 | 3.30 | 0.76 | 0.14 | 6.80 | 29.40 | 10.00 | 23.84 | 0.28 | 13.50 | 6.50 | 0.32 | 1.10 | 0.66 | 24.00 | | 变异系数Cv2 | 0.35 | 0.51 | 0.41 | 0.31 | 0.46 | 0.40 | 0.38 | 0.47 | 0.43 | 0.44 | 0.25 | 0.36 | 0.28 | 0.27 | 0.37 | | 异常下限 | 0.132 | 13.20 | 3.39 | 0.72 | 28.30 | 132.30 | 46.40 | 98.49 | 1.21 | 57.30 | 38.70 | 1.53 | 6.10 | 3.77 | 113.20 | 浓集系数(Cf1/Cf2) | 1.14 | 1.54 | 1.52 | 1.73 | 1.16 | 1.20 | 1.16 | 2.44 | 0.99 | 1.33 | 1.22 | 2.24 | 1.96 | 2.03 | 1.14 | 离散程度(Cv1/Cv2) | 2.13 | 4.36 | 3.25 | 3.21 | 1.08 | 1.25 | 1.46 | 4.64 | 1.79 | 1.47 | 2.98 | 4.66 | 6.23 | 4.00 | 2.65 | 中国土壤Cf2[27] | 0.08 | 10.00 | 1.40 | 0.30 | 13.00 | 65.00 | 24.00 | 40.00 | 0.80 | 26.00 | 23.00 | 0.80 | 2.50 | 1.80 | 68.00 |
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Characteristics of the elements content
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The map of element differentiation feature
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元素 | Ag | As | Au | Bi | Co | Cr | Cu | Hg | Mo | Ni | Pb | Sb | Sn | W | Zn | Ag | 1.000 | | | | | | | | | | | | | | | As | 0.355 | 1.000 | | | | | | | | | | | | | | Au | 0.166 | 0.079 | 1.000 | | | | | | | | | | | | | Bi | 0.337 | 0.409 | 0.158 | 1.000 | | | | | | | | | | | | Co | 0.192 | 0.123 | 0.165 | 0.156 | 1.000 | | | | | | | | | | | Cr | 0.254 | 0.128 | 0.145 | 0.061 | 0.516 | 1.000 | | | | | | | | | | Cu | 0.340 | 0.129 | 0.287 | 0.361 | 0.480 | 0.408 | 1.000 | | | | | | | | | Hg | 0.220 | 0.516 | 0.086 | 0.035 | 0.129 | 0.285 | 0.068 | 1.000 | | | | | | | | Mo | 0.216 | 0.500 | 0.097 | 0.186 | 0.197 | 0.285 | 0.219 | 0.355 | 1.000 | | | | | | | Ni | 0.449 | 0.235 | 0.165 | 0.113 | 0.577 | 0.855 | 0.447 | 0.338 | 0.351 | 1.000 | | | | | | Pb | 0.445 | 0.159 | 0.131 | 0.204 | 0.298 | 0.231 | 0.211 | 0.131 | 0.188 | 0.312 | 1.000 | | | | | Sb | 0.350 | 0.656 | 0.134 | 0.129 | 0.168 | 0.362 | 0.127 | 0.725 | 0.487 | 0.459 | 0.268 | 1.000 | | | | Sn | 0.300 | 0.370 | 0.086 | 0.730 | 0.030 | -0.014 | 0.250 | 0.007 | 0.155 | 0.024 | 0.155 | 0.078 | 1.000 | | | W | 0.254 | 0.280 | 0.087 | 0.129 | 0.077 | 0.364 | 0.099 | 0.292 | 0.274 | 0.399 | 0.177 | 0.453 | 0.079 | 1.000 | | Zn | 0.531 | 0.249 | 0.122 | 0.231 | 0.355 | 0.465 | 0.279 | 0.261 | 0.285 | 0.590 | 0.774 | 0.367 | 0.182 | 0.302 | 1.000 |
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Correlation coefficient matrix of geochemical data
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Combined anomaly map of the Yue’e mining area in Xieng Khouang Province, Laos
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Comprehensive anomaly analysis map of area A 1—Quaternary; 2—Permian Khang Khai formation; 3—Carboniferous-Permian Nong Het formation; 4—Ban Lao compound rock mass; 5—copper ore body; 6—faults and their numbers
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Section of line 13 in area A 1—Quaternary; 2—Permian Khang Khai formation; 3—skarn alteration zone; 4—biotite granodiorite; 5—copper ore body (w(Cu)≥0.2%); 6—copper mineralization body (w(Cu)=0.1%~0.2%); 7—construction drilling and numbering; 8—design drilling and numbering
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Comprehensive anomaly analysis map of area B 1—Permian Khang Khai formation; 2—Carboniferous-Permian Nong Het formation; 3—Ban Lao compound rock mass; 4—Sn ore body and number; 5—fault and number; 6—B prospecting target area
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Section of line 00 in area B 1—Quaternary;2—Permian Khang Khai formation;3—fragmented alteration mineralization zone;4—tin polymetallic mineralization (w(Sn)≥0.2%);5—tin polymetallic mineralization (w(Sn)=0.1%~0.2%) ;6—exploring trough and number;7—construction drilling and orientation;8—construction drilling;9—design drilling
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蚀变矿(化) 体编号 | 矿(化)体规模 | 矿种 | 矿(化)体产状 | 含量 | Sn平均含量 | 长/m | 控制延深 /m | 平均厚度 /m | 主矿种 | 伴生矿种 | 倾向 /(°) | 倾角 /(°) | B-Ⅰ | >500 | 8 | 6 | Sn | Zn、Ag、 Co、Bi | 75 | 75~85 | Sn:0.16~7.23;Zn:0.23~0.82; Ag:47.3~271; Co:0.43~0.55;Bi:0.01~0.13 | 1.05 | B-Ⅱ-1 | 50~100 | 2 | 4 | Sn | Bi | 100 | 55~75 | Sn:0.11~1.20; Bi:0.019~0.025 | 0.77 | B-Ⅱ-2 | 50~100 | 2 | 4 | Sn | Bi | 90~100 | 55~75 | Sn:0.13~0.44; Bi:0.01~0.023 | 0.26 | B-Ⅱ-3 | >180 | 125 | 6 | Sn | Ag、Bi | 90~100 | 75~85 | Sn:0.21~4.58;Bi:0.01~0.051; Ag:2.29~16.23 | 0.80 | B-Ⅲ-1 | >500 | 10 | 8 | Sn | Pb、Zn、 Bi、Ag | 90~100 | 70~85 | Sn:0.10~1.80;Pb:0.53~1.70; Zn: 0.49~0.72;Ag:4.09~167; Bi:0.01~0.068 | 0.42 | B-Ⅲ-2 | 100~150 | 10 | 4 | Sn | Pb、Zn、 Bi、Ag | 90~100 | 70~85 | Sn:0.12~1.40;Pb:0.57~0.92; Zn:0.54~1.12;Ag:15.47~87.52; Bi:0.01~0.012 | 0.52 |
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List of characteristics of ore body in area B
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Comprehensive anomaly analysis map of area K 1—Permian Khang Khai formation; 2—Carboniferous-Permian Nong Het formation; 3—Ban Lao compound rock masse; 4—fault and number; 5—copper mine
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