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 cryptoexplosion 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 automorphic-hypautomorphic-xenomorphic granular,metasomatic and poikilitic.The ore structures mainly show disseminate,brecciated,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.