Metallogenic Conditions And Prospecting Direction Of Gold-silver Deposit In Pangkaimen North Hill 294 Of Huma County,Heilongjiang Province

The study area is located in the Tianshan-Xingmeng orogenic belt between Siberia plate and the North China plate and the Pacific plate,in which the northeast section of iron,wolfram,silver,gold,copper,molybdenum,lead and zinc metallogenic belt of Daxinganling,metallogenic subzone of guliku-Pangkaimen silver and gold,late Jurassic early Cretaceous in Daxinganling volcano activity belt of guliku-huma volcano faulted basin.The main metallogenic series of gold and silver deposits related to intermediate acid volcanic rocks is mainly developed in the area.The main stratas include Niqiuhe group of lower Devonian-upper Silurian series.Guanghua and Gushanzhen and ganhe group of lower Cretaceous.sunwu group of Oligocene and quaternary.The volcanic rocks in the area was very developed.The basic intermediate basic volcanic magma activity was strong,and the intermediate acidity and acidity all had different degrees of activity,which provided the hydrothermal source and material basis for gold mineralization.Pangkaimen North Hill 294.0 gold and sliver ore bodies produced mainly from Ganhe formation and Gushanzhen formation of the lower Cretaceous,and occured in siliconization tectonic breccia and cryptoexplosive breccia,which located in the first,second,third ore belt.The shape of ore body is controled bysiliconization tectonic breccia and cryptoexplosive breccia,the space is showed as echelon vein,the part had phenomenons of branch composite and convergent-divergent and apex reappearance.The trend of ore body is between 165-185°.The ore body on the 120-244 line tends is between 75-95°,and the dip angle is between 45-70°.The ore body on the 244-284 line tends to the West or nearly upright,the dip angle is between 70-85°.The control length is between 50 and 1700 metres,the maximum exposure width is 40 metres,the narrowest is 1.0metres.Controled the slanting is between 5 and 197 metres.Ore minerals are native gold and silver,gangue minerals feldspar,chlorite,carbonate,sericite,pyrite,limonite,chalcedony,and a small amount of magnetite.According to minerogenetic condition and mineralization characteristics,and the relationship between these metallogenetic data and gold deposit,the thesis considers that surrounding rock near mine is ganhe group of lower cretaceous,Ore bearing of gushanzheng rocks are silicified rhyolitic breccia and Silicified tectonic breccia,the SN fault structure are uppermost ore-transmitting,ore-controlling and ore-hosting structure.During the next prospecting,we should deploy the engineering in four section,which are mineralized zone of the second and the third,strong alteration,Au-Ag fits well and high resistance and low polarization.Meanwhile,we should deploy the deeper engineering verification and enlarge effect on prospecting ore.