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

1 Yu 1 Ding 1 1, 2 accounts for Gangle 1, 3 1, 4 gross hair 1 1.

(1. Jiangxi Geological Survey and Research Institute, Xiangtang 330201; 2. Lushan Branch of Jiangxi Geological Survey and Research Institute, Jiujiang 332100; 3. Jiujiang Branch of Jiangxi Geological Survey and Research Institute, Jiujiang 332000; 4. Nanchang Branch of Jiangxi Geological Survey and Research Institute, xiang tang 33020 1)

This paper introduces the results of the large-scale investigation project "Evaluation of Sn-Cu-Au polymetallic deposits in Jiuling metallogenic belt in northern Jiangxi", and puts forward some suggestions for the next work.

Key words: tin, copper, gold; Work suggestion; Jiuling metallogenic belt; Jiangxi

"Evaluation of Sn-Cu-Au polymetallic ore in Jiuling metallogenic belt in northern Jiangxi" (code: 2001kloc-0/0200040) belongs to the project of "Evaluation of Mineral Resources in Adjacent Areas of Anhui and Jiangxi" of China Geological Survey.

Jiuling metallogenic belt is located in the north of Jiangxi Province, starting from Wuyuan County in the east, reaching Tonggu and Wanzai County in the west, Dean City, Xiushui and Fuliang County in the north and Yifeng County and leping city in the south, covering most areas of 2 1 county and city. It is 400 ~ 430 km long from east to west and 80 ~ 120 km wide from north to south, covering an area of about 43,000 km2. Geographical coordinates: east longitude 11400 ′ ~11800 ′, north latitude 2800 ′ ~ 3030 ′ (figure1).

Figure 1 Traffic Location Map of Northwest Jiangxi

The basic idea of this evaluation work is: under the guidance of the new metallogenic theory, starting from the practical experience of prospecting, deepening the understanding of metallogenic geological environment and metallogenic regularity, as the basis of mineral resources evaluation, correctly judging the main types of deposits and selecting key areas, breaking through new fields, discovering new minerals and types, and exploring large-scale ore occurrences.

The evaluation work is divided into four levels: regional mineral resources evaluation, mineral resources evaluation in metallogenic prospect area, pre-investigation and evaluation of ore occurrence, and abnormal verification of ore occurrence. In the past three years, 1: 1000 and 1: 25000 geological surveys have been carried out in Maopengdian-Bazinao, Yunshan, Xijiuling and Jinjiawu areas. A 1:25000 soil geochemical survey was conducted in Bankengwu, Duanxin, Jialu, Shayangkeng-Bazinao, Wangjialing-Zhoutian, Qiping-Jinkeng, Baocikeng, Luocheng, Yang Jiawu and Yinghuajian. In Maopengdian, Baocikeng, Luocheng and other areas with concentrated mineralization, IP ladder profile measurement and IP sounding were carried out at 1: 10000. According to the task and design, exploration projects such as trough, well, pit and drilling were carried out, among which 15 boreholes in verification target areas such as Maopengdian, Bazinao, Mianhuawu, Dengjiashan, Tongmukeng, Luocheng and Jinjiawu were implemented, and a few pit exploration verification projects were built in Jinjiawu, Baozikeng and other new mining areas. 43 soil geochemical anomalies of Sn-W, Cu-Zn and Au-As were delineated, and 4 IP anomalies were found. Check 40 anomalies, see 2 1 ore, verify 3 1 ore (mineralization) point, evaluate 12 prospecting target area, and verify 8 in deep engineering; Collect and complete a large number of test samples; The regional metallogenic geological environment, metallogenic regularity and comprehensive evaluation of mineral resources prospect are studied comprehensively. The mineral pre-investigation and evaluation of Maopengdian-Bazinao tin (tungsten) mine, Yunshan tin (copper) mine, Xijiuling copper-gold mine and Jinjiawu gold mine and the prospect evaluation of tin, copper and gold (tungsten, lead and zinc) mineral resources in Jiuling metallogenic belt have been completed.

1 evaluation result indicators

(1) There are 7 newly discovered mineral deposits (Maopengdian, Mianhuawu, Dengjiashan, Tongmukeng tin mine, Jinjiawu, Jialu gold mine and Luocheng copper mine), of which 1 (Jinjiawu gold mine) is available for detailed investigation and 5 (Luocheng copper mine, Maopengdian, Dengjiashan and Tongmukeng) are available.

(2) Delineate 23 metallogenic prospect areas, including 9 A-type metallogenic prospect areas, namely Huangmao, Luocheng-Shangshanli, Qiancun, Lu Heng-Moon-shaped copper (gold) polymetallic metallogenic prospect area, Pengshan, Yunshan, Maopengdian-Bazinao tin polymetallic metallogenic prospect area, Jinjiawu gold metallogenic prospect area and Dahutang tungsten (tungsten).

(3) The regional mineral resources potential is evaluated as a whole. The predicted resources of Jiuling metallogenic belt are (3.34): 600,000 tons of tin (including 250,000 tons in Yunshan area), 86,543,800 tons of copper (including 4 million tons in the southern margin of Jiuling), 0/60 tons of gold/kloc (including 70 tons in Jinjiawu area) and 60 tons of tungsten (WO3).

2. New discoveries and breakthroughs in prospecting.

(1) Three tin ore bodies have been delineated in Maopengdian tin mine, of which 1 is 700 meters long from north to south, 300 meters wide from east to west, and 1.4 ~ 8.7 meters thick, with an average tin grade of 0.42% and the highest tin grade of 6% ~ 8%.

(2) There are 10 tin-bearing alteration time pulse belts in Bazinao tin mine, among which three industrial ore bodies are circled, with a controlled length of 400 meters, a thickness of 0.80-3.06 meters and an average tin grade of 0.31%-0.58%; Altered granite vein-type tin ore bodies are newly discovered in the deep, with a controlled length of 240m, a thickness of 65438 0.00m and an average tin grade of 0.40%.

(3) Mianhuawu tin mine has 35 timely veinlets containing tin and tungsten; The newly discovered concealed altered granite-type tin deposit is 500 meters long and 340 meters wide, with an average thickness of 2.9 1 meter and an average tin grade of 0.39%.

(4) There are 2 1 structural alteration zone tin ore bodies in Dengjiashan tin mine, of which No.4 ore body has a controlled length of 870 meters, an average thickness of 5.93 meters and an average tin grade of 0.33%.

(5) Tongmukeng tin mine has controlled three tin ore bodies, of which 1 ore body has a controlled length of more than 500m, an average thickness of 5.2 1m and an average tin grade of 0.477%.

(6) Seven tin (copper) orebodies in structural alteration zone were found in Zhoutian Xi (copper) mine, in which 1 orebody was more than 220m long, with an average thickness of 2.42m, with an average tin grade of 0.35% and a copper grade of 0.72%.

(7) Two copper mineralization zones have been delineated in Luocheng Copper Mine, among which four copper bodies have been found in 1 copper mineralization zone, with a controlled length of more than 940m, a controlled maximum extension of 560m, an average thickness of 5.92m, a copper grade of 0.20% ~ 1.95% and an average grade of1.0. Anomalous areas with high geochemical content of elements such as copper and zinc in soil have been newly delineated in the western extension of copper mineralization belt I and copper mineralization belt II in the south, and two abnormal zones have been delineated by IP profile measurement and IP sounding, which have considerable prospecting prospects.

(8) Jinjiawu Gold Mine controls three gold belts, with a length of 1200 ~ 6000m and a width of 3 ~ 30m. Nine gold bodies are circled, with a length of 300 ~ 600 m, the longest length of 1200m, the average thickness of 3. 15m and the maximum thickness of/kloc.

(9) Three gold ore bodies have been newly discovered and delineated in Jialu Gold Mine, among which No.4 ore body is 550m long and 1 ~ 3 m wide, with an average gold grade of 6. 15× 10-6 and the highest gold grade of 29× 10-6.

(10) There are 23 local anomalies of Sn and W soil geochemical exploration (17), 2 local anomalies of Cu and Zn (2), Au and As (18) and 4 IP anomalies (3). * * * See Mine 2 1.

3 New understanding of regional metallogenic regularity

(1) comprehensively put forward the formation, evolution and distribution law of nonferrous, rare and precious metal deposits in this area: the time shows that "multi-stage mineralization, with late Jurassic-early Cretaceous as the main metallogenic period"; Spatially, it is characterized by "block-belt" metallogenic zoning, ore accumulation at the edge of the block, and two-way composite zoning along the northeast and near east-west direction; The favorable geological conditions for the formation of large-scale deposits are "multi-mineralization superposition and multi-type accumulation", strike-slip shear extension and thrust, composite ore control of sliding structures, composite mineralization of multi-level large-scale structure superposition, multi-type magma and multi-level in-situ mineralization.

(2)NNE (or NNE) strike-slip thrust and extensional structure, and two nappe (sliding) structural systems near EW direction and NNE-NNE direction are the dominant structures for controlling rocks and minerals; Long-term active deep fault zone and paleostructure are important factors restricting diagenesis and mineralization.

(3) The southern margin of Jiuling Mountain is a multi-level large-scale tectonic superimposed composite metallogenic environment, which belongs to the western section of Yifeng-Jingdezhen deep fault-intermediate acid porphyry belt, and is also the superimposed part of late Mesoproterozoic plate margin "rift", late Paleozoic rift and Mesozoic-Cenozoic large-scale nappe (slip) structure, and is compounded with NNE strike-slip thrust and extensional structure, with rich ore sources (ore source beds) superimposed and enriched for many times.

(4) Rock (layer) blocks formed by structural superposition, such as the opposite confrontation of faults or folds, large-angle arc twisting or bending, mixed rock (block) layers, interlayer detachment zones and derivative twisting structures in or near strike-slip shear zones, are all abnormal parts of composite metallogenic structures, and are often located in areas where large deposits are distributed.

4 Evaluation of results and benefits

The evaluation results of project resources have achieved good social and economic benefits, in which Maopengdian tin mine has been developed and utilized by the mine, with a static investment profit rate of 65,438+04.73% and a static investment return rate of 22.77%. Jinjiawu Gold Mine has been developed and utilized in detail, with a static investment profit rate of 44.06% and a static investment return rate of 49. 13%. The exploration, development and utilization of Jialu gold mine were carried out. A general survey has been carried out in Dengjiashan tin mine area, and Honghuaao tin mine has also entered the general survey; Luocheng Shangshanli copper polymetallic metallogenic prospect, Yunshan tin (copper) polymetallic metallogenic prospect, Dahutang tungsten (tin) metallogenic prospect, etc. It was listed as the key evaluation section of the project "Evaluation of Copper, Tin and Tungsten in Wuning-Yifeng Area of Jiangxi Province" in 2004-2005. In 2006-2008, Jiangxi Shangli-Fengxin copper polymetallic metallogenic prospect area was listed as "Jiangxi Shangli-Fengxin copper polymetallic mineral evaluation" project.

5 Suggestions for the next step

It is suggested to further investigate and study the metallogenic environment of the southern margin of Jiuling Uplift, the southern side of Shigong Mountain Uplift, Yunshan area and Dahutang area, and carry out resource evaluation of Huangmao, Luocheng-Shangshanli, Lu Heng-Yuexing and other copper-polymetallic metallogenic scenic spots, Yunshan tin (copper) metallogenic scenic spot and Dahutang tungsten (tin) metallogenic scenic spot as soon as possible, and actively expand Pengshan tin-polymetallic metallogenic scenic spot in front of the village.

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

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

(1. Jiangxi Geological Survey Institute, xiang tang 330201; 2. Jiangxi Geological Survey Institute, Lushan Branch, Jiujiang 332100; 3. Jiangxi Geological Survey Institute, Jiujiang Branch, Jiujiang 332000; 4. Jiangxi Geological Survey Institute, Nanchang Branch, xiang tang 33020 1)

Abstract: This paper introduces the latest achievements of the large-scale survey project of tin-copper-gold polymetallic deposits in Jiuling metallogenic belt in northern Jiangxi, and puts forward some suggestions for the next work.

Key words: tin, copper and gold; Work suggestion; Jiuling metallogenic belt; Jiangxi