【摘要】 本文通过江西武山吴家和安徽铜陵代家冲两个铁帽型金矿床的矿石矿物组成特点的研究,为长江中、下游进一步寻找和评价铁帽型金矿床提供必要的依据。更多还原

【Abstract】 Gossan-type gold deposit is of important economical value. By the study of ore chemicalcomposition of gossan-type gold deposits from the middle and lower reaches of Yangtze River, wefind that, in the ore, the Au content increases with the increase of Cu, As and Bi comtents and thedecrease of Ba, Mg contents, while the Ag content rises with the increase of Mn, Pb and Zncontents. The authors propose the minor elements indicators in evaluation of gold-bearing ability ofgossans as follows. In the gossan ores with Cu+As (both in wt%)>0.01, the content of Au isoften greater than 1 g/t, while those with (Mn+Pb+Zn)>0.5 (all in wt%), the content of Agis over 5 g/t. The emphasis is placed on the mineralogy of supergene gold, goethite, hematite,oxides and hydroxides of manganese (chalcophanite, birnessite, hollandite, cryptomelane andpyrolusite), covellite, and remnant primary pyrite, etc. A lot of genetic information and oreprospecting typomorphic peculiarities are extracted from these minerals.更多还原