| The Shuangwang gold deposit, located in Devonian stratum of the West Qinling,is a low grade and large-scale breccia type gold deposit. After20years’s mining andoperations, the reserved resources of gold deposit has dropped significantly, so it isthe sticking point to find new resources for mining development.Through integrated study on the geological background, geological features, andgeochemical characteristics of Shuangwang gold deposit, it is summarized thatprospecting guide of the gold inclde four aspects. Firstly, a hidden breccias belt is adirect indicator of gold prospecting. Secondly，Albitization and iron dolomitization ofthe Devonian strata can be used as auxiliary prospecting criteria.Thirdly, depositgeochemical characteristics are regarded as the major prospecting signs, and the mostcrucial geochemical anomalies for the evaluation of the gold mines of this district isthe pyrite halo geochemical anomalies. Fourthly， Thermoelectric and crystalcharacteristics of pyrite are as extremely significant as the pyrite halo characteristicsfor ore-searching in this area.Pyrite crystal morphology of Shuangwang Gold Deposit is relatively simple,mainly involving {100}{111} and {hk0}. The major crystal forms of pyrite are{111} and {hk0}, which account for73%, while the crystal form of {100} isresponsible for27%. The map of crystal form value reflects that the pyrite containsmore Au in the west than the east, with the trend to extend the the deep of explorationlines24~30. The thermoelectric coefficient of the pyrites ranged from-250μV/℃to250μV/℃. Most of the thermoelectric conductive type of pyrites are N-P type,hardly any separate N type and P-type. The occurrence rate of N-type pyrite (N%) is60.7%, and P-type pyrite (%) is39.3%. With elavation decreasing, pyrites tend tofollow conduction patterns from P to NP to PN to N.P-type of No.8orebody presents lower in middle parts and higher in both sides，in the middle of1100reaching the extremum from32to34lines. P-type of No.9orebody generally presents a trend of decreasing from shallow to deep, owning twoextremal areas from west to east.The head halo element, Sb and Ba, approximately present a trend of reducingfrom top to bottom. Concretely speaking, these elements tend to enrich in west ofexploration lines0~7and the deep of exploration lines26~30. Ba is relatively richespecially in exploration lines of34~40.In the mass, near-ore halo elements, Cu, Pb and Zn, tend to rise from top tobottom. In terms of KT9, the element of Zn presents enrichment in the area of theexploration lines0~7and20~24, while Zn and Pb are rich in the exploration lines 6~16. In terms of KT8, Pb and Zn concentrate in the exploration lines26~30and34~44.Rear halo elements such as Bi, Mo and Co show a enriched trend from up tobottom, which is considerably concentrated in the line1100of28~32,36and44.Therefore, the head halo and rear halo commonly exist in the area.Based on the comprehensive analysis of the characteristics of crystal form,pyroelectricity and trace elements’ primary halo of pyrite, it is delineationed out8prospecting target region. Among them, the A-type target region includes the deep ofexploration lines26~28of KT8and the deep of exploration lines14~20of KT9; theB-type target region owns the deep of exploration lines36~40and44of KT8and thedeep of exploration lines0~7and8~10; the C-type target region involves the deep ofexploration lines40~44of KT8and exploration lines0~8of KT9.In the diversity of target regions, the region of A-type target has the highestreliability, which can be available as the prospecting area in the near future; B-typetarget region takes second place, which should be considered comprehensivelycombining with recent work and development; while it is the hardest to find oredeposit in C-type target region. |
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