The f ractal analysis of gold grades in drill cores f rom the Puziwan cryptoexplosive gold deposit has been done. The fluctuation of gold grade data conforms to the power-law dist ribution which is characterized by the f ractal dimention D. The f ractal dimentions of gold grades in the breccia body increase gradually f rom top to bottom vertically and f rom south to north horizontally.Combining the result of shallow seismic exploration , the occurring locations of ore bodies , the surface st ructure and the st ructural features of the breccia body revealed by drill holes , the relationship between the f ractal dimentions of gold grade and gold grade of the deposit has been discussed. The possible spatial dist ribution regularity of ore bodies has been proposed.
The Dayangcha’s gold deposit occur in granite - greenstone belt of J ipegou. Analyzed deriving of the ore2forming meterial ,type of deposit and metallogenic by summing up geological feature of the deposit ,doing metallogenetic prognosis and pointing out prospecting direction.
Ore bodies of Xiadian Gold Deposit ,located in the south segment of Zhaoping fault belt , are cont rolled by fault st rucure ,vein rock ,secondary fault st ructures ,and host in Special locations where alterated belt s are obvious and occurrence changes f rom gentle to steep with rule of pitch to north-east and end to end alignment . Important breakthrough has been attained so that new-explored gold reached about 20 tons by the end of 2000 via the rule above.
bioleaching of sulfide minerals is now an established indust ral technology for pretreating ref rectory gold concent rates and for ext raction of copper. The development and optimization of these processes requires and clear understanding of mechanism and kinetics. There is still not a generally accepted mechanism for bio-oxidation of sulfides. It is the purpose of this paper to review recent development in the mechanism research in the view of chemist ry , elect rochemist ry and molecular genetics. The chemical reactions and oxidation pathways of sulfur moiety , the elect rochemical basis , the essential component s of the iron and sulfur oxidation system and elect ron t ransport chain are briefly summarized.
This article int roduces the history , actuality , difference and problem between the abroad with our in ref ractory gold ore heap bioleaching in tow decade developed. Now still it’s in a alternate test time of laboratory and field . With laboratory test and filed carry out ,in the character of ore , if the ore with high acid consuming ,bad osmosis ,low sulfur and the gold locked by nonmetal ,it’s considered difficult to heap bioleach. In other way , the requirement circumstance and condition for developing of heap bioleaching technology are discussed in the difference of result between in laboratory and filed test , in nature condition and using bacterial , and then some of the suggestion is put forward. Finally , f rom the point of view of the resource ,market condition ,developing experience and using in extend area ( the concent ration heap biooxidation , ref ratory ore heap biooxidation + CIL) , a fine future is affirmed in ref ractory gold resource development with heap bioleaching technology.
Based on analysis and improvement of some driving methods of raise shaft in medium-and-small mines , this paper int roduces two development methods suitable to raising in medium-and-small mines. Compared with convention methods and supporting methods ,the two int roduced methods have advantages of decreasing timber consumption ,reducing labor inrtensity ,shortening operation of cycle and lowering production cost .
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