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引言克里萨斯金矿床于1980年被巴西INCO有限公司的勘探分队所发现。自矿床发现后分队对矿床完成了大量的评价工作,包括250多个的金刚石钻孔和一个勘探斜井。“钻探表明约有7百万短吨,平均品位每短吨为0.34盎司的金矿”(INCO有限公司1985年年度报告),相当于630万吨品位11.7克/吨的金。本文描述克里萨斯金矿床的地质特征并认为它是后生成因的,形成在绿片岩相—角闪岩相区域变质作用之后。岩石学研究和钻孔内挑选出的含矿岩石全岩和矿物分析数据提供了工作的基础资料。
INTRODUCTION The CRISSA gold deposit was discovered in 1980 by an exploration unit of INCO Inc., Brazil. After the discovery of the deposit, the detachment completed a great deal of evaluation of the deposit, including more than 250 diamond bores and an exploration inclined shaft. “Drilling shows a gold mine of about 7 million short tons and an average grade of 0.34 ounces per short ton” (Inco Ltd 1985 Annual Report), equivalent to 6.3 million tonnes of gold of 11.7 g / t. This paper describes the geological characteristics of the Kelisha gold deposit and considers it to be a post-causal gene that formed after the metamorphism of the gneiss-amphibolite facies. Petrology studies and borehole-wide rock and mineral analysis data have been selected to provide the basis for the work.