胶东大磨曲家金矿床矿石及金矿物特征

Characteristic of gold ore and gold mineral in Jaodong Damoqujia gold deposit

大磨曲家金矿床为破碎带含金蚀变岩型金矿床,其矿石主要为黄铁绢英岩、黄铁绢英岩化碎裂岩、多金属矿化矿石及少量含金石英脉。矿床主要经历热液和表生2个成矿期及5个成矿阶段。主要载金矿物为黄铁矿。金矿物为自然金和银金矿,金的赋存状态为包裹体金、晶隙金、裂隙金,以裂隙金和晶隙金为主,二者占79%;金矿物粒度以中细粒为主,占69%。

Damoqujia gold deposit is an alteration type gold deposit where the gold occurs in the crash belt. The main ore is beresitization, beresitization cataclasite, polymetallic ore and a little amount of auriferous quartz vein. The deposit experienced two metallogenic period, hydrothermal metallogeny and supergenic metaUogeny, and the metallogenic stage can be classified as 5 stages, which is embodied as pyrite-qnartz, quartz-pyrite, polymetallic sulfide and carbonate. Pyrite is the main gold loading mineral, and the gold mineral is natural gold or electrum. The occurrence states of gold are expressed as gold inclusion, interstitial gold and fracture gold. The interstitial gold and fracture gold makes up 79% of them, and the grade of gold mineral is mainly medium-grained and fine, which makes up 69 % of the gold mineral.