Evaluation results and work suggestions for tin-copper-gold polymetallic deposits in the Jiuling metallogenic belt in northern Jiangxi

Luo Xiaohong 1 Yu Zhongzhen 1 Ding Shaohui 1 Zhu Hanqing 1, 2 Zhan Gangle 1, 3 Wu Guangming 1, 4 Mao Dafa 1 Lin Li 1

(1. Jiangxi Geological Survey Research Institute, Xiangtang 330201; 2. Lushan Branch of Jiangxi Institute of Geological Survey, Jiujiang 332100; 3. Jiujiang Branch of Jiangxi Institute of Geological Survey, Jiujiang 332000; 4. Nanchang Branch of Jiangxi Institute of Geological Survey, Xiangtang 330201)

Abstract: Introduces the results of the "Evaluation of Tin, Copper, and Gold Polymetallic Ore Deposits in the Jiuling Metallogenic Belt in Northern Jiangxi" large-scale survey project, and puts forward suggestions for the next step of work.

Keywords: tin-copper-gold; work suggestions; Jiuling metallogenic belt; Jiangxi

"Evaluation of tin-copper-gold polymetallic deposits in the Jiuling metallogenic belt in northern Jiangxi" (code: 200110200040) is affiliated to the "Mineral Resources Evaluation in Adjoining Areas of Anhui and Jiangxi" project of China Geological Survey.

The Jiuling metallogenic belt is located in the north of Jiangxi, starting from Wuyuan County in the east, ending at Tonggu and Wanzai counties in the west, starting from De'an City, Xiushui and Fuliang County in the north, and ending in Yifeng County and Leping City in the south. Covering most of 21 counties and cities; 400-430km long from east to west, 80-120km wide from north to south, covering an area of ​​about 43,000km2; geographical coordinates: 114°00′～118°00′ east longitude, 28°00′～30° north latitude 30′ (Fig. 1).

Figure 1 Transportation location map in northern Jiangxi

The basic idea of ​​this evaluation work is: guided by the new mineralization theory, starting from the practical experience of mineral prospecting, deepening the mineralization geological environment The understanding of mineralization and mineralization laws serves as the basis for mineral resource evaluation, correctly determines the type of main deposits and selects key sections, breaks through new areas, discovers new mineral species and types, and explores large-scale mineral areas.

The evaluation work is divided into four levels: regional mineral resource evaluation, mineral resource evaluation in mineralization prospect areas, mineral area preliminary investigation and evaluation, and mineral spot anomaly verification. Over the past three years, 1:10,000 and 1:25,000 simple geological surveys or rough surveys have been carried out in Maopengdian-Bazinao, Yunshan, western Jiuling and Jinjiawu areas; in Bankengwu and Duanxin , Jialu, Shayangkeng-Bazinao, Wangjialing-Zhoutian, Qiping-Jinkeng, Baocikeng, Luocheng, Yangjiawu, Yinghuajian and other prospecting prospecting sections, a 1:25,000 prospecting Soil geochemistry measurements; in areas with concentrated mineralization such as Maopengdian, Baocikeng, and Luocheng, 1:10,000 induced electric ladder profile measurements and induced electric soundings were carried out; and trenches and wells were conducted according to tasks and designs. , pits, drills and other prospecting projects, including 15 drilling holes in verification target areas such as Maopengdian, Bazinao, Mianmianwu, Dengjiashan, Tongmukeng, Luocheng and Jinjiawu, and in Jinjiawu, Baoci A small number of pit exploration verification projects have been carried out in new mining areas such as pits; 43 soil geochemical anomalies of Sn-W, Cu-Zn, and Au-As were delineated, and 4 electrostatic anomalies were found; 40 anomalies were inspected, and 21 minerals were found. 31 mineralization (chemical) points were verified, 12 prospecting target areas were evaluated, and 8 were verified by deep engineering; a number of test samples were collected and completed; a comprehensive evaluation of the regional mineralization geological environment, mineralization rules and overall mineral resource prospects was carried out Research. Completed the mineral pre-census and evaluation of the four working areas of Maopengdian-Bazinao tin (tungsten) mine, Yunshan tin (copper) mine, Jiuling west copper-gold mine, and Jinjiawu gold mine and the tin mineralization belt of Jiuling , copper, gold (tungsten, lead and zinc) mineral resource prospect evaluation work.

1 Evaluation results indicators

(1) 7 newly discovered mineral deposits (Maopengdian, Mianmianwu, Dengjiashan, Tongmukeng tin mines, Jinjiawu, Jialu gold mines , Luocheng Copper Mine), including 1 mineral area that can be investigated in detail (Jinjiawu Gold Mine), and 5 mineral areas that can be surveyed (Luocheng Copper Mine, Maopengdian, Dengjiashan, Tongmukeng Tin Mine, Jialu gold mine).

(2) 23 metallogenic prospect areas have been delineated, including 9 Category A (available for recent arrangement of work) metallogenic prospect areas, namely Huangmao, Luocheng-Shangshanli, Cunqian, Henglu- The moon-shaped copper (gold) polymetallic mineralization prospect area, Pengshan, Yunshan, Maopengdian-Bazinao tin polymetallic mineralization prospect area, Jinjiawu gold mineralization prospect area and Dahutang tungsten (tin) polymetallic mineralization prospect area Mine prospect area.

(3) An overall evaluation of the regional mineral resource potential was carried out. The predicted resources of the Jiuling metallogenic belt (334): 600,000 tons of tin (including 250,000 tons in the Yunshan area), 8.1 million tons of copper (including 4 million tons at the southern edge of Jiuling), 160 tons of gold (including 70 tons in Jinjiawu area), 1 million tons of tungsten (WO3) (including 500,000 tons in Dahutang area), and more than 2 million tons of lead and zinc.

2 New discoveries and breakthroughs in ore prospecting

(1) Maopengdian Tin Mine has circled 3 tin ore bodies, among which No. 1 tin ore body is 700m long from north to south and wide from east to west. At 300m, with a thickness of 1.4~8.7m, the average Sn grade is 0.42%, with a maximum of 6%~8%.

(2) 10 tin-bearing altered quartz vein zones have been discovered in the Bazinao tin deposit, 3 of which have circled industrial ore bodies, with a controlled length of 400m, a thickness of 0.80-3.06m, and an average Sn grade of 0.31 % ~ 0.58%; and a newly discovered altered granite vein type tin ore body has been discovered in the depth, with a controlled length of 240m, a thickness of 1.00m, and an average Sn grade of 0.40%.

(3) There are 35 tin-bearing tungsten quartz veinlets circled in the Mianhuawu tin mine; a newly discovered hidden altered granite-type tin ore body is 500m long, 340m wide, with an average thickness of 2.91m, and an average Sn Grade 0.39%.

(4) 21 structural alteration zone-type tin ore bodies were discovered in Dengjiashan Tin Mine, of which No. 4 ore body has a controlled length of 870m, an average thickness of 5.93m, and an average Sn grade of 0.33%.

(5) Tongmukeng Tin Mine has controlled 3 tin ore bodies, of which the No. 1 ore body has a controlled length of more than 500m, an average thickness of 5.21m, and an average Sn grade of 0.477%.

(6) Seven structural alteration zone-type tin (copper) orebodies were discovered in the Zhoutian tin (copper) mine. Among them, No. 1 orebody is more than 220m long, with an average thickness of 2.42m and an average Sn grade of 0.35%. The average Cu grade is 0.72%.

(7) Luocheng Copper Mine has delineated 2 copper mineralization zones, among which 4 copper ore bodies have been discovered in the No. 1 copper mineralization zone, with a controlled length of more than 940m and a maximum controlled depth of 560m. The average thickness of the ore body is 5.92m, the Cu grade is 0.20% to 1.95%, and the average grade is 1.01%; in the west extension of the No. 1 copper mineralization zone and the southern No. 2 copper mineralization zone, soil geochemistry of Cu, Zn and other elements is newly determined. In the abnormal content area, two abnormal zones have been delineated by IP profile measurement and IP sounding, and the prospecting prospects are promising.

(8) Jinjiawu Gold Mine has controlled 3 gold ore belts, 1200-6000m long, 3-30m wide; 9 gold ore bodies have been circled, 300-600m long, 1200m long, The average thickness is 3.15m, the maximum thickness is 16.40m, the average Au grade is (3.05~8.22)×10-6, and the highest is 37.96×10-6.

(9) Three gold ore bodies were newly discovered and delineated in Jialu Gold Mine. Among them, No. 4 ore body is 550m long and 1~3m wide. The average Au grade is 6.15×10-6, and the highest grade is 29 ×10-6.

(10) This time, 23 local anomalies of Sn and W soil geochemical exploration are circled (17 inspections), 2 local anomalies of Cu and Zn (2 inspections), and 18 anomalies of Au and As ( 18 locations were inspected), and 4 locations with electrostatic anomalies were delineated (3 locations were inspected); 21 mines were discovered.

3 New understanding of regional mineralization rules

(1) Comprehensively propose the formation, evolution and distribution rules of non-ferrous, rare and precious metal deposits in this area: time shows "multi-stage formation" Mineralization, Late Jurassic to Early Cretaceous are the main metallogenic periods"; spatially, it is manifested as "block and belt" metallogenic divisions, with ore accumulation at the edges of blocks, and composite zoning along the north-northeast and nearly east-west directions; In terms of formation, it is reflected as "multiple metallogenic superpositions and multi-type aggregation", strike-slip shearing-extension and thrust, and sliding structures compound mineralization, multi-level large-scale structural superposition compound mineralization, multiple types of magma, and multi-level formation. The mineralization and other environments are superior geological conditions for the formation of large-scale mineral deposits.

(2) The NNE (or NE) strike-slip thrust and extension structures and the two major thrust (slip) overlying tectonic systems in the nearly east-west direction and the northeast-northeast direction are the controlling Rock-controlled mineralization dominates structures; long-term active deep fault zones and ancient structures are important factors restricting rock formation and mineralization.

(3) The southern margin of Jiuling is a multi-layered large-scale structural superposition composite mineralization environment. It not only belongs to the western section of the Yifeng-Jingdezhen deep fault-intermediate acid porphyry belt, but also belongs to the late Mesoproterozoic The plate edge "rift valley", the late Paleozoic rift and the Mesozoic and Cenozoic large-scale thrust (slip) overburden structure overlap, and are compounded with the NNE strike-slip thrust and extension structures, and have rich mineral sources (source layers) , multiple thermal flow fields and mineralization anomaly composite structural parts that are repeatedly superimposed and enriched have huge copper polymetallic resource potential.

(4) Rock (layer) blocks formed by superimposed structures are facing each other in different directions, fractures or folds, large-angle arc twisting or bending, mixed rock layers (blocks), interlayer detachment zones and strike-slip shear Derived twisting structures within or beside the incisal zone are all abnormal parts of complex mineralization structures, and are often partial areas where large mineral deposits are produced.

4 Results and Benefit Evaluation

The project resource evaluation results have achieved good social and economic benefits. Among them, the Maopengdian tin deposit has been developed and utilized by the mine, with a static investment profit rate of 14.73% and a static investment income of 14.73%. The rate is 22.77%; the Jinjiawu gold deposit has been developed and utilized in detail, with a static investment rate of return of 44.06% and a static investment rate of return of 49.13%; the Jialu gold deposit has also been surveyed and developed; the Dengjiashan tin mining area has been Census work has been carried out, and the Honghuanao tin mine has also entered the census work; Luocheng Shangshanli copper polymetallic mineralization prospect area, Yunshan tin (copper) polymetallic mineralization prospect area, Dahutang tungsten (tin) mineralization prospect area, etc. , was listed as a key evaluation section in the 2004-2005 "Evaluation of Copper, Tin and Tungsten Mines in Wuning-Yifeng Area of ​​Jiangxi Province" project; the copper polymetallic mineralization prospect area in Shangli-Fengxin area of ​​Jiangxi Province was listed as a major land and resources survey in 2006 ~2008 "Copper Polymetallic Mine Evaluation Mine Evaluation in Shangli-Fengxin Area, Jiangxi Province" project.

5 Suggestions for next work

It is recommended to further carry out investigation and research on the mineralization environment such as the southern edge of Jiuling uplift, the southern side of Zhangongshan uplift, Yunshan area and Dahutang area. , carry out resource evaluation work as soon as possible in Huangmao, Luocheng-Shangshanli, Henglu-Yuexing and other copper polymetallic mineralization prospect areas, Yunshan tin (copper) mineralization prospect area, and Dahutang tungsten (tin) mineralization prospect area , actively expand prospecting and exploration in the Pengshan tin polymetallic mineralization prospect area and the Cunqian copper polymetallic mineralization prospect area.

Valuation Results and Working Suggestion of the Sn-Cu-Au Polymetallic Ore in the Jiuling Metallogenetic Belt in North Jiangxi

Luo Xiaohong1, Yu Zhongzhen1, Ding Shaohui1, Zhu Hanqing1,2, Zhan Gangle1,3, Wu Guangming1,4, Mao Dafa1, Lin Li1

(1. Jiangxi Institute of Geological Survey, Xiangtang 330201; 2. Jiangxi Institute of Geological Survey, Lushan Subinstitute, Jiujiang 332100; 3. Jiangxi Institute of Geological Survey, Jiujiang Subinstitute, Jiujiang 332000;4. Jiangxi Institute of Geological Survey, Nanchang Subinstitute, Xiangtang 330201)

Abstract: This paper introduces the up-to-data results from the Lar-scale Investigation Project, the evaluation of the Sn-Cu-Au polymetallic ores in the Jiuling Metallogenetic Belt in North Jiangxi and points out the further working propositions.

Key words: Tin-copper-gold; Working suggestion; Jiuling metallogenetic belt; Jiangxi