The paper deals with geochemical characteristics of ore-forming and halo-forming processes of Au deposits with severalmetallogenic stages.Idealmodel of primary halo over-printing and criteria for prediction of large size blind Au deposits are established on studies of modeling the primary halo overprinting of large size Au deposits.
This paper makes an exploration on gold-ant imony deposits metal logenic regularity in Mazhala,south Tibet in respects of geological feature,distribution regularity of mineralization space,ore control factors,and analyse metallog enesis systematically.At last,the further prospecting orientation in this gold-ant imony field are summarized and pointed out.
Anhua Furong gold deposit belongs to a shattered altered rock type gold ore deposit which has great prospecting futurities.In Hunan Province,the discover of this deposit was an important breakthrough in prospecting and looking for gold ore deposits recenty ears,has broken through the pattern of the gold ore deposit scale on the little side,has affected and changed the idea and train of thought of the gold deposits geology and prospecting.It also has provided a good model for looking for large scale new type gold deposits.By expouding of the geological features and metallogenic conditions of the Furong gold deposit.this paper analysises and researches the geological and geochemical characteristics of the deposit,summarized the deposit enrichment regularities and discusses the deposit origin.
According to the dist ributed features、metallogenic geologic conditions、wall-rock alteration and paragenous mineral association of the gold deposits in Hunan Province,on the basis of the exploration、tapping-utilization、mining geology、ore-bearing rocks and mineralization of the indicators for gold ore resource,this paper subdivided the gold deposits of Hunan into different types, prospected future gold resource,discusses the development methods.
Through the analysis of the Cao jiaw a gold mine Dajiang mining area’sore forming geological conditions,the paper puts forward the ore body forming regularities and point out directions for the following geological exploration.
A pretreating process of pressure leaching in acidic sulfate and nitrate solution and combined with sequent pressure leaching of the residue in a Ca(OH)2 or ammonia solution for a refractory gold concentrate contain ing high As and Sb was proposed and investigated.The factors that affected pressure acidicor alkaline leaching were tested and discussed.Experimental results indicated that over 90% of gold was cyanided after pretreating by the combined process under optimized conditions.In contract,nearly zero percent of gold was extracted in direct cyanidation of the refrectory gold concentrate.On the other hand,a new extractive process of gold from the residue of acidic pressure leaching of the refractory concentrate was developed.In this extractive process the residue containing elemental sulfur was suffered by pressure leaching in a Ca(OH)2 solution at a controlled pH range.The chemical process was described,and main factors affecting gold extracted yield was tested.The extracted gold in the process was near to the cyanidation after combined pretreating.
More extensive low-grade oxidized deposits of gold are dispersed over Longnan mountain regions in Gansu Prov ince.Their characteristics are zonal dist ribution,large scale and low grade.Gold can be ext racted by means of tank leaching,heap leaching and cyaniding,less capital and more quickly effective,realizing returns on an investment in just one year.The profit ratio of the capital is very high.They possess many feasible factors in the development and utilization.
Discussed grinding-grading circle road questions in rock gold from some fields of proffer ore、circle road equipment compound、swell and peculiar trouble、concentrated and fine degree monitoring,proffered countermeasures of solving concerned according to the practice of Huchang gou gold mine.
Heitai gold mine is a large altered mylonite gold deposit which was proved up in the middle of 1980's,with concomitance of Ag and Cu.The mine put into production in the late of 1980's.Through enlargement and technical improvement,it grows into a large mine which can handle 900 t ore a day.In the explorat ion of mo re than ten years,it brings us experiences as well as lessons.The thesis summarizes them,and brings forward effective approaches to further development of the mine together with prospecting for reserves increase.
This paper briefs the Xiaotieshan mine's high-grade residual deposit extraction technology.The Xiao tieshan mine's ore body condition is badness,on initial the mine had used some kind of mining method to experiment.There is lot of over stocking mine and the caved residual deposit on the joint part of each mining method.We used the drifi-fill stoping and under drift-fill stoping on this over stocking mine.On the caved residiual deposit we used some techonolgy such as cement injection、the mode of excavate and extraction sequence ptimization、drill and ground support modification、streng then the mangement of fill to safe and high efficiency extraction this mine.
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