大兴安岭北部虎拉林金矿床矿石及金矿物特征

虎拉林金矿位于额尔古纳成矿带北段，属于与斑岩体有关的隐爆角砾岩型金矿。矿石中主要的金属矿物为黄铁矿、褐铁矿和黄铜矿，同时也是主要的载金矿物；非金属矿物主要为石英和长石。矿石的主要结构为自形—半自形—他形粒状、交代和包含；矿石的主要构造为浸染状、角砾状、脉状和团块状。金矿物以自然金为主，其次为银金矿，其形态以角粒状、尖角粒状、长角粒状和麦粒状等居多，以中细粒者常见，最大粒度为0.38 mm×0.42 mm×0.06 mm。金的赋存状态以粒间金为主，其次是裂隙金和包裹金。依据矿石中金矿物粒度和赋存状态特征，建议矿石的磨矿细度选择以10 μm为宜，并可采用重选—浮选法进行选矿。

The Ore and Gold Minerals Characteristics of Hulalin Gold Deposit in North of Daxing' anling

Hulalin gold deposit is located in the north of Erguna ore-forming belt,belongs to the eryptoexplosion breccia type gold deposit related to the porphyry body.The major metallic minerals,also the major gold carrier minerals are pyrite,limonite and chalcopyrite;The nonmetallic minerals are quartz and feldspar.The ore textures include automorphie-hypautomorphic-xenomorphic granular,metasomatic and poikilitic.The ore structures mainly show disseminate, breeciated,veinlet and massive.The gold minerals are dominated by the native gold,and others are the electrum.Shapes of gold minerals are mostly granular,sharp-angled grain,longhorn granular and michael granular with middle to fine granule,the largest gold grain size is 0.38 mm×0.42 mm×0.06 mm.Gold occurs mainly in shape of interparticle gold,fissure gold or inclusion gold are taken the second place. Based on the features of gold grain size and occurrence in ore,the proposed ore grinding fineness choose 10 μm is appropriate,and may use the mineral processing of re-election-flotation.