Deep Metallogenic Prediction Research Of Xishan Gold Deposit, In The City Of Longkou, Shandong Province

Jiaodong area is an important rock gold production base in China.Linglong ore field is the main ore field of the jiaodong gold province, Xishan mining area lies in the northwest of Linglong ore fields, contains Linglong ore field No. 108, 107 and 55 gold vein, belong to medium-sized mines.As with nearly 20 years of mining, Xishan mining area of Au resources less and less, belong to the resources crisis mines.The article regard Xishan mining area Linglong gold mine as research area,summarizes the study area based on regional geological background, mineralization characteristics, discusses the Xishan ore deposit geological characteristics and ore body shape characteristic, systematically carry out mining rock ore geochemical analysis:(1) with X-ray Serise2 plasma mass spectrometer in Linglong gold mine surface and underground vein rocks, ores, granite, altered rock and close to mine the surrounding rock of trace and rare earth elements to systematically measure. Results show that the Linglong gold Xishan ore deposit of Au, Ag, Pb element is extremely rich, but variation coefficient of Au, Ag and Pb is higher, easy in local enrichment.In addition, the enrichment of Xishan mining area showed light rare earth, the characteristics of the heavy rare earth losses, and light rare earth curve is steep, heavy rare earth is relatively gentle character, there is an obvious Eu negative anomaly.In my opinion, Xishan mining area metallogenetic multiple period, multi-phase complex evolution process.At the same time, the ore area have magmatic origin, hydrothermal genesis and sedimentary origin.(2) by using fluid inclusion petrography observation,microscopic measurement and laser Raman spectroscopy experiment, analyzes the ore-forming fluid of Xishan mining area, such as the physical and chemical characteristics of temperature, pressure, depth and so on, so as to explore the genetic types of Linglong gold mine of Xishan mining area. Through the analysis of the fluid temperature measurement, the main metallogenic epoches main temperature mainly concentrated in 160 ℃ ~ 210 ℃, show that Xishan mining area is low temperature type deposit.Through uniform temperature and salinity of fluid inclusions calculated ore-forming pressure, and according to the metallogenic pressure work out depth, it is concluded that fluid metallogenic depth of Xishan mining area at 8.33 ~ 16.5 km, the average deep about 11 km.(3) Carrying out the analysis of characteristics of different ore-forming stages of pyrite. Thermoelectric coefficient, according to the thermoelctric coefcient of pyrite, the mineralization temperature in Xishan mining area range 170.08 ℃ from 337.46 ℃, belongs to thelow temperature liquid deposit.By pyrite thermoelectric coefficient to calculate the erosion rate of Xishan mining area, the denudation level mainly in 35.50% ~ 75.50%,and negatively correlated with P type pyrite appear rate relations, reflects the ore area have multi metallogenic period.From pyrite pyroelectricity vertical distribution,show the current control level is still in the ore body in the upper position, and deep still has prospecting potential.According to the aforesaid geological and geochemical data of Xishan mining area, combining with the exploration engineering data, the selection of GOCAD software, main ore block of Xishan(X coordinate range is 40543920 ~ 40545420, Y range is 4148500 ~ 4150000, Z coordinate change range is- 400 ~ 400, modeling about 1000 m depth, modeling covers an area of 2.4 km2) in 3D geological modeling and deep metallogenic prediction.In GOCAD software, selecting discrete smooth interpolation(DSI), interpolation and the three dimensional simulation of pyrite thermoelectric coefficient, proper adjustment of parameters, the simulation results and the known data to match, it is concluded that deep thermoelectric coefficient of Xishan mining area of the three dimensional simulation diagram, and the simulation diagram of deep compared with the developed area, in combination with ore prospecting information( the middle and deep hole), delineating favorable targets of Au for hydrocarbon prospecting. To provide a scientific basis for mining the deep and periphery prospecting of Xisan ore field.