硫镍钴矿——一种新发现的载金矿物

Siegenite:A New Gold-Bearing Mineral

金厂铜金矿床是中国东北部一超大型斑岩型铜金矿床，J-0号矿体为矿床内一典型的斑岩型铜金矿体。J-0号矿体有3种载金矿物：硫镍钴矿、黄铁矿和黄铜矿。硫镍钴矿主要元素为Ni、Co、S，Ni 含量19．005％～28．14％，Co含量26．877％～34．971％，S含量40．242％～44．076％，矿物的Ni/Co 原子摩尔比为0．55～1．03，与其理论值Ni/Co≈1相近；矿物的（Ni，Co）/S原子摩尔比为0．68～0．74，与其理论值（Ni，Co）/S＝0．75相吻合，其晶体化学分子式与（Ni，Co）3 S4相符。硫镍钴矿中的自然金的成色较高，在830～955之间。硫镍钴矿作为载金矿物，在金厂矿区和国内金矿床是首次发现，在世界范围内金矿床中也十分罕见，到目前为止还未发现相关报道。其在金厂矿区的发现填补了硫镍钴矿作为载金矿物领域的空白，为研究与完善金的成矿理论提供了关键证据，因此，这一发现存在重大的现实意义与地质意义。

Jinchang Cu-Ag deposit is a super-large scale porphyry Cu-Au deposit in Northeastern China.No.J-0 is a typical porphyry Cu-Au ore body in the deposit.There are three gold-bearing minerals in the J-0 ore body：siegenite,pyrite and chalcopyrite.Major element of the siegenite are Ni,Co and S.Ni constitutes 19.005%-28.14%,Co constitutes 26.877%-34.971% and S constitutes 40.242%-44.076% in the Siegenite.The atomic mol ratio of Ni/Co is 0.55-1.03,close to the theoretical value （Ni/Co≈1）.The atomic mol ratio of（Ni,Co）/S is 0.68-0.74,tallying with the theoretical value [（Ni,Co）/S= 0.75],and the crystal chemical molecular formula is coincides with（Ni,Co）3 S4 .The purity of natural gold is high in the siegenite,between 830 and 955.As a gold-bearing mineral,it was the first time to discover siegenite in the Jinchang mining areas and gold deposits in China.It is also a rare finding for gold deposits throughout the world.By far,there are no related reports.The discovery in the Jinchang gold area has important factual and geological meaning,and made the discovery that siegenite is a new gold-bearing mineral,and it was found for the study and improvement of gold mineralization theory provides key evidence.