摘要
个旧矿区以产锡为主,同时伴生有色、稀有金属及贵金属。金和银与有色金属可构成伴生、共生矿床。银可达大型矿床规模,金可达中型矿床规模。 (一)地质概况个旧矿区位于南岭东西向构造带和川滇南北向构造带的复合部位。矿区内出露地层主要是中三叠统的个旧组碳酸盐岩和法郎组砂页岩夹泥质灰岩、白云岩。区内有印支、燕山期的基性、酸性和碱性岩浆岩侵入体。
The associated precious metal(gold, silver)together with nonferrous metal(copper, lead, zinc, tungsten, bismuth etc.)in the Gejiu tin ore area can reach a certain scale and constitute the paragenetic ore deposit in which gold is dominantly related to the olivine basalt and silver to the granite. Gold shows a close relation to bismuth and silver to lead or copper. Generally, gold is enriched in the skarn-type sulfide ores with rich bismuth whereas silver is enriched mainly in the sulfide and oxidize ores containing a high content of lead and subordinatively in the sulfide ores with rich copper. Gold occurs cheifly as an independent mineral(electrum), silver exists dominantly in the form of isomorphism and partialy in the form of the independent minerals(such as native silver, argentite, hypergyrite, polybasite, argentobismuthite and discrasite). Gold is recovered generally from the bismuth concentrates and silver from lead or copper concentrates.
出处
《云南地质》
1990年第1期65-74,共10页
Yunnan Geology
