Mineral Geochemistry And Deep Prediction Of The Qianhe Gold Mine In Henan

Qianhe gold mine locates in the points intersected by the fault of the Tantou basin north-east edge and Machaoying faulted belt ductile-ductile-brittle shear zone of the middle of Machaoying faulted belt. The Qianhe gold deposit belongs to structural altered rock type deposit, which in the porphyritic rhyolite, dacite and andesite of Xiong'er group Jidanping formation, and andesite, amygdaloidal andesite bearing tuff. Heyu porphyritic granite rock body exposes the south of the gold deposit. This paper comes down to four aspects, including the characteristics of the gold mine, the relationship between altered rock mineral and gold mine, the geochemical zonation of Au and associated elements, and quartz fluid inclusion, based on which some beneficial attempt done to predict the deep perspective of the gold mineThe Qianhe gold mine includes three metallogenic stages, which is the early ore-forming stage characterized by quartz, the major ore-forming stage characterized by pyrite, and the late ore-forming stage characterized by carbonate. The first metallogenic stage includes sericite-quartz sub-stage and pyrite-quartz sub-stage, the second stage includes quartz-pyrite sub-stage and quartz-polymetal sulfide, the last stage includes quartz-chlorite sub-stage and quartz-carbonate.The magnetic susceptibility of altered rock is analyzed by WCL-1 potable touching type magnetization meter. The magnetic susceptibility has negative correlation with gold grade. The relative contents of nineteen species altered mineral are measured by the Portable Infrared Mineral Analyzer (PIMA), and the change tendency of alteration-mineralization zone is preliminarily analyzed. Besides, the zonation regularity of Au-associated elements and geochemical parameter is analyzed, indicating the characteristic of Qianhe gold mine primary overprint halo ideal model. That is the string ore body show coexistence criterion or overprint of the head and tail halo.With the means of mineralogical mapping, the quartz genetic mineralogy such as the petrography characteristic of fluid inclusion, uniform temperature and decrepitation temperature of fluid inclusion was analyzed. The size of fluid inclusionis between 8¹1μm², the more distribution density and uniform temperature between 200℃²50℃indicate the high gold grade. The lower initial temperature andâ… type decrepitation curve indicate the high gold grade. The higher decrepitation peak and the wider decrepitation temperature interval indicate the high gold grade. The major liquid composition of quartz fluid inclusion is Cl-, SO₄²- , Na⁺, Ca²⁺, small F^-, K⁺, Mg²⁺. The gas composition of quartz fluid inclusion is CH₄, H₂O, C₂H₆, H2_S, CO₂, small N2 and Ar, and fluid inclusion basicly belongs to NaCl- H2O system.