A survey of literatures on bioreactors used to bioleaching sulfide ores was proposed.Based on the analysis of the performence and design guideline of stirred tank and airlift reactor,it was indicated these machines do not fully match the particular conditions in bioleaching systems for sulfide ores. The factors affecting the performance of the bioreactor and the new prospects of recent development s were discussed.
Make a systematic summarize of the kind and size of the Au mineral, content of the Au mineral and the exist form of Au. Thought the study of comparing the content of Fe2O3 and Au in the limonite, demonst rating the content of Au and As in the arsenopyrite, discussing the relation between characteristic of pyrite and mineralization of Au, relation of Au,et al,draw a conclusion that Maquan gold deposit main mineral are limonite, arsenopyrite, pyrite ,minor mineral are quartz,et al. Ag in the mineral is from the mineral of Sb and Pb. Seeking on the earth’s surface, mineralization of limonite can be looked as the symbol,into the deepth , arsenopyrite, pyrite can be looked as the symbol.
According to the technological mining conditions of the roof and bottom pillar in Xincheng gold mine , the calculation formula of maximum deformation and horizontal critical load on artificial roof have been deduced by applying limit analytical method. The stability of the roof and bottom pillar has been monitored. During the test , the YZYof drilling hole st ress sensor with st rain and rigidity and the ast rictive meter have been used and tested separately the variation of st ress in the rock and the cooling strain in the drift road. A effective method has been t racked out for monitoring the stability of the analogical pillars.
The basic principles of the bio-oxidation of refractory gold-bearing concent rate in oxidation-box in static state are int roduced. Through 187 days’bio-oxidation , the test-samples, the gold leaching rate came f rom 37.04 %(before bio-oxidation) to 93.01 %(after bio-oxidation),and this result got a same level as the tank bio-oxidation (93.68 %). The economic analysis shows that a small scale gold mine take this technics to process the ref ratory gold2bearing concent rate,the cost and capital will only be 1P3 and 1P2 respectively of a same scale tank bio2oxidation plant,and the favorable practicability are forecasted to this technics.
Dry-filling stoping was t ried to apply since 1993 in Hetai gold mine of Guangdong Gaoyao, but it wasn’t spread deeply for various reasons, such as no filling material storage, ore pass often jammed, the amount of sill pillar and butt ress pillar const ruct project. These questions were solved basically when the method or mining was researched comprehensivery in 2000, with this method, the throughput increases year by year, promothing the progress of mining technique and improving the mine benefit .
Since Yunxi Mine launched the comprehensive experiment of the exploitation method and adopted the technology of homologous f ramework st ructure and hollow areas disposal (the new technology of artificial jamb , artificial floor and three-powerful operations) in 2000, the reloss and re-impoverishing were reduced and the gold grade was highly improved. Therefore, the will be accomplished 2 levels’total loss ratio and impoverishing ratio were only 3.58 % and 15.27 % respectively as well as the better tech-economy efficiency were gained.
This article int roduced an disposal on serious collapse of raise chute due to the crushing ore.The test has suggested that this method is quite safe and runs economically. It has reference values on similar problems in the related mines.
This paper present s the resultant of valent form t race gold by the typical examples f rom the middle part of the Bangonghu Lake to Nujiang River mineralization belt, Tibet. The expermental fact indicates that Au3 + and Au0 are closely related in the soils samples,the correlation coefficient (r) is 0.96, ∑Au and (Au3 + + Au+) are correlative in the st ream sediments samples, r =0.50. For example above ,the source and gensis of Au0,Au3+ and Au+,and its significance of ore-prospecting have been discussed.
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