Geochemical Exploration Prospecting Methods Applied Research In The Practice Of Cattle-wave Gold Prospecting

Based on the regional geochemical data from 1:200,000 Yuanyang Sheet Regional Geochemical Exploration taken charge by author, by means of modern mineralogy, mineralization and geochemical theory, author study the optimum estimate and characteristics of Au geochemical abnormity in regional geochemical exploration and methods of seeking ore in field in this paper, and emphatically study a typical example: Niubo Au geochemical abnormity in Luchun County, Yunnan Province.Optimum estimate of Au geochemical abnormity in regional geochemical exploration mainly face to actual work in field. Optimum estimate of abnormity based on experiential analysis mainly range all abnormity according to statistical mark of eight items as below: ① strength of abnormity, ② area of abnormity, ③ contrast of abnormity, ④ scale of abnormity, ⑤ assemble and zoning of elements, ⑥ strength zoning of abnormity, ⑦ geological setting of mineralization, ⑧ mineral resources. Niubo Au geochemical abnormity in Luchun County is located 23^th in whole area and 9^th in local area according to above rules, and it's statistical type is A, and potential type is second. The strength center of all elements overlapped is considered as an important index in optimum estimate of Au geochemical abnormity.Abnormal characteristics of Niubo gold deposit determined by model analogy is as below: As-Sb-Hg-Cu as elements of front halo, Au-As-Sb-Hg-Ag-Pb as elements of ore-body halo and Mo-W-Cr-Cd as elements of back halo.Good effect of seeking ore relies on integrative and neat use of many methods in field work.The technique, analyzed results ranged from 4ppb to 10000ppb and content request of finding ore in field work, of rapid simple Au analysis in spot ought to be used in field work of finding ore. The way is an effective method in increasing effect of seeking ore.Gold not only tend to concentrate in coarse incompact sediment but also in fine. So, analyzed results from coarse incompact sediment and fine both have same effect in finding ore.Gold tend to concentrate in C layer in thicker soil.Study for catchment basin and area, been confined by abnormal point of Augeochemical abnormity, determine on extension of seeking ore.The assay for panning concentrating is better than for water system sediment, especially for unremarkable Au geochemical abnormity, in farther survey for panning concentrate and water system sediment. The way convenient for determining high value abnormal area and potential area of mineralization. Taking rough panning concentrating 30 kg, and keeping 20 or 30 grams fine panning concentrate assay by rapid simple Au analysisin spot.Survey for soil, working scale in 1:10000 or 1:5000, only put up the strength center in farther survey. Location of uncovering project is determined by farther survey for soil in the strength center of Au abnormity in soil.Landform or topographic condition and geological setting are considered in determining location of uncovering project. The change in horizontal and vertical of Au contents in uncovering project decided the farther location of uncovering project. After finding out Au ore-body, explorative project ought to be designed according to characteristics of ore and criterion of exploration for estimating mineral resources reserves and evaluating potential.Geological tracing is the working way found out ore-body in periphery area according to characteristics of geology of ore-body and geochemical exploration. The means can rapidly outspread the area and scale of deposit if it is exploited well.