黑龙江省北大沟金矿床矿石特征及金的赋存状态研究

Study of Ore Features and Gold Occurrence of the Beidagou Gold Deposit in Heilongjiang Province

黑河市北大沟金矿床是近年来在大兴安岭燕山期成矿带发现的与火山热液有关的浅成中-低温热液型金矿床,矿床的矿石类型主要为石英脉型。矿石的结构为半自形-它形粒状结构、交代结构、胶状结构。矿石的构造为致密块状构造、稀疏浸染状构造、细脉状构造。金矿物为自然金,以裂隙金为主,其次是粒间金,包裹金只占少数,金矿物以细粒为主,载金矿物主要为石英。金的赋存状态较简单,属易浸型矿石,有用组分含量较高,具有较高的工业利用价值。北大沟金矿与三道湾子金矿的矿石特征和金的赋存状态相似,显示北大沟金矿的深部及外围具有巨大找矿潜力。

The Beidagou gold deposit in Heilongjiang Province is a newly-discovered mesothermal-epithermal gold deposit related to the Yanshanian volcanism, located in the Da Hinggan Ling Mountains metallogenie belt. The ore type of the Beidagou gold deposit is quartz vein type. The ore textures are hypautomorphic-xenomorphic granular, metasomatic and colloidal. The ore is characterized by dense block, disseminate and veinlet structures. Gold appears as natural gold at the state of intergranular, crevice and enclosure, occurring in the major gold-carrying mineral quarlz. Gold minerals are commonly fine grain size. The ore is easy leaching. It has useful composition and industrial value. The ore features and gold occurrence of the Beidagou gold deposit is similar to the Sandaowanzi gold deposit, showing a great potential to search for other large-scale gold deposits at depth and in the surrounding areas.