Standardized Mineral And Its Significance Of Laozuoshan Gold Deposit In Heilongjiang Province

Laozuoshan Gold Mine is one of the important gold producing areas in Heilongjiang Province and the second largest rock gold deposit in the province.In this paper,the gold mineral and standard minerals in the mining area are studied by combining the field work,the data collation and the generalization,combined with the field geological survey and the treatment of the sample,and provide the basis for the further study of the genesis,metallogenesis formation temperature and guiding prospecting.Through the previous data and experimental analysis obtained the following some understanding:The location of theLaozuoshan gold deposit is the junction of Shuangyashan City,Qitaihe City and Baoqing County in Heilongjiang Province.Strata exposed in the mining area have Lower Proterozoic Xingdong Group Malaysia River group(Pt1d),(J3sh)of Mesozoic Jurassic and Cenozoic Quaternary loose sediments(Q4).The main ore-bearing strata of the Laozuoshan Gold Mine are the DaMaHe Group(Pt1d)marble and the large area exposed mixed rock.Gold ore field is mainly divided into East ore belt,middle belt and western ore belt.The eastern ore belt is distributed in the eastern part of the Laozuoshan gold deposit,and the orebodies are located in the middle of the mining area.The ore belt in the western ore belt is located in the southwest.There are many types of alterations in the surrounding rock of the Laozuoshan Gold Mine,mainly including silicification,skarnization,potassium,carbonate,chlorite and so on.The hydrothermal effect of the Laozuoshan gold deposit is divided into two early and late ore-forming periods.The early ore-forming period is divided into pyrrhotite-arsenopyrite-calcite stage,colloidal pyrite-ironite-quartz stage and coarse-grained calcite-quartz-arsenopyrite stagethree mineralization stages.The late ore-forming stage can be divided into pure quartz stage,coarse-grained arsenopyrite-quartzvein stage,fine-grained arsenopyrite-polymetallic sulfide-quartz and calcite-quartz stage four mineralization stages.The natural gold particles in the ore are coarse and uneven,and the shape is mostly equiaxed,and the other is irregularly shaped.The form of gold is mainly in arsenopyrite and pyrite.The experimental results show that gold is deposited in the form of gold and granule gold in arsenopyrite and pyrrhotite.Through the microscopic observation and electron probe analysis of pyrite,arsenopyrite,pyrrhotite,chalcopyrite and sphalerite,it is found that the above five mineral gold deposits are more common and can be used as gold-bearing minerals.The main elemental elements and trace elements in some standard minerals can reflect the mineralization temperature of the standard minerals.Based on the experimental results and analysis the mineralization temperature may be formed in the medium and high temperature environment.