| Qinghai Wulonggou Gold Mine,in recent years,the amount of gold has reached more than 110 tons,With a large scale,but the relevant research lag.Based on the tutor's research project,the author selected a representative Yanjingou Gold Deposit,collected and produced 80 pieces of light samples,on the basis of the brief research,choosing widely distributed pyrite and arsenopyrite,this paper makes a deep research on the relationship between output state,natural combination,crystal structure,standard feature,ge the following understanding:1.The ore type is dominated by sparse disseminated and stained vein-like minerals.Mineral with a crystal structure,crushing structure,solid solution separation structure,metasomatic structure,annulus structure,including structure and other structural types.There are 22 kinds of metal minerals,mostly metal sulfide,mainly pyrite,chalcopyrite,sphalerite,arsenopyrite,pyrrhotite,a total of 48 kinds of natural combination type.2.Pyrite found in 77 polished section,accounting for 96% of the total number of polished section,a total of 33 kinds of natural combination type,and 18 kinds of minerals were associated;arsenopyrite were found in 14 polished section,accounting for 18% of the total number of polished section,a total of 12 kinds of natural combination type,and 8 kinds of minerals were associated with.Mineral association is complex,reflecting the mineralization has many characteristics.3.Pyrite can be seen four kinds of crystal form,of which xenotopic,hexahedron and pentagonal dodecahedron-based,octahedron rare,indicating that the ore-forming temperature to the main low temperature.Xenotopic pyrite found in 62 polished section,accounting for 77.5% of the total number of polished section;hexahedral pyrite is found in 32 polished section,accounting for 40% of the total number of light;dodecahedron pyrite found in 21 polished section,accounting for 26.25% of the total number of polished section;Octahedral pyrite is seen in two polished section,accounting for 2.5% of the total number of polished section4.Through the analysis of electron probe components,pyrite part of the test points to detect Au,Au(Wt%)has a maximum value of 0.092%.Indicating that pyrite is gold-bearing minerals,and Au distribution is uneven,there is enrichment point,but not yet formed "visible gold",gold in the form of gold wrapped.Another in the pyrite fissure also detected Au,Au(Wt%)content of 0.078%,indicating the existence of invisible fissure gold.The main element S/Fe atomic weight ratio of pyrite is much larger than 2,which is characterized by weaker rich and rich Fe,the Co/Ni ratio of trace elements is 0.23~6.87,the average value is 2.33,which is similar to that of hydrothermal pyrite,which reflects the pyrolysis of pyrite.5.Arsenopyrite can be seen semi-self-shaped aggregate and self-shaped granite two kinds of crystal form,often associated with pyrite,cross-section mostly long columnar,rhizose columnar,cross-section of the diamond-shaped or long strip,smaller particles,with low temperature arsenic characteristics.Semi-self-shaped aggregates of toxic sand found in five polished section,accounting for 6.25% of the total number of polished section;self-shaped granular arsenopyrite was found in 9 polished section,accounting for 11.25% of the total number of polished section.6.Through the analysis of the electron probe components,arsenopyrite detection points detected in the Au,Au(Wt%)has a maximum value of 0.093%.Indicating that arsenopyrite is gold-bearing minerals,and Au distribution is uneven,there is enrichment point,but not yet formed "visible gold",gold in the form of gold wrapped.The main element S/As ratio of arsenopyrite is greater than 1,indicating that the gold arsenopyrite has obvious characteristics of rich S and poor,and has the characteristics of low temperature hydrothermal arsenopyrite.In summary,the Yanjingou gold deposit has many types of metallogenic minerals;and the mineralization process is complicated;pyrite and arsenopyrite are gold-bearing minerals;The gold is mainly in the form of "invisible" super-micro-wrapping gold and fissure gold;mineral deposits in the characteristics of low temperature hydrothermal genesis,it is presumed to be a crushed zone alteration rock type gold deposit mainly composed of medium and low temperature hydrothermal. |
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