The Gaxian Ni - Co deposit locate between Siberian platform and Sino - Korea paraplatform. This deposit is a mag-matic liquation - hydrothermal rework sulfide deposit. It is different from other common Cu - Ni sulfide deposit in its low grade of Cu and Ni , Ni - Co ore body ouccurs in pyroxene periodate. Ore minerals is consisted of pyrite, pentlandite and magnetite etc. The inler-growlh of pentlandite and pyrite forms disorder granulation. Commonlly magnetite forms later than the others and always found in pentlandite as stockworks. Pyrrhotite and pentlandite show in dissemination, veinlet, veinlet - dissemination and partially plaque or vein slructues. Geophysical exploration in this area not only undercovered spatial distribution features of Ni orebodies and regularity of mineralization and enrichment, but also found the best technique combination for prospecting similar deposits in this area, which is consisted of high - power IP ( pole - dipple array) sounding and high - precision magnetic survey.%嘎仙镍钴矿地处西伯利亚地台与中朝准地台过渡地带,位于内蒙—大兴安岭褶皱系大兴安岭优地槽褶皱带,属岩浆熔离—热液改造型硫化物镍矿床.该矿床类型特征与常见的铜镍硫化物矿床不同,镍品位低、贫铜,镍钴矿(化)体赋存辉石橄榄岩中.金属矿物主要由黄铁矿、镍黄铁矿和磁铁矿等组成,其中镍黄铁矿与黄铁矿紧密共生,成不规则颗粒状镶嵌于黄铁矿中；而磁铁矿—般形成较晚,多见于镍黄铁矿中,呈网脉状产出.磁黄铁矿、镍黄铁矿呈浸染状、细脉状、细脉浸染状,局部斑块状、脉状,矿产于辉石橄榄岩中.通过对该区开展的地球物理工作,不仅对镍矿(化)体的空间分布特征及矿化富集规律有了很好的认识,而且总结出了该区找矿的最佳技术方法组合,即大功率单极—偶极测深装置激发极化法与高精度磁法的结合.
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