陕西铜峪铜矿床主要特点及开发利用中遇到的问题及对策

THE MAIN FEATURES OF SHAANXI TONGYU COPPER DEPOSIT AND SOME RECOMMENDATIONS USED FOR DEVELOPMENT AND EXPLOITATION

铜峪铜矿是陕西地矿局第八地质队1972～1979年勘查探明的一个火山岩型的小型铜矿床,探明铜矿石量1047.88万吨,金属量65064.64吨,平均品位0.62%。共圈铜矿体73条,其中主矿体9条,主矿体储量占总储量77%,矿石量803万吨,金属量49778吨,平均品位0.62%。最大的主矿体7号矿体(盲矿体),矿石量185万吨,金属量13826吨,平均品位0.75%。矿体分布集中,多为扁、鸡窝状,尖灭再现明显,矿体与围岩属渐变过渡关系,没有明显界线,矿体厚度变化较大。开发利用发现矿体厚<3m时,开采贫化率>50%,无法开采利用(以往勘查最小可采厚度≥0.8m)。根据这一情况,按照最小可采厚度≥3m,重新对主矿体进行了圈定,开采矿体厚度≥3m的矿体或矿体中厚度≥3m的部分,有效的把矿石的贫化率控制在30～35%之间,实现了矿山规模化生产、保证了矿石入选品位。

The Tongyu copper Deposit is a small--sized copper deposit in volcanic rocks, which was explored by Geological Team No. 8 of Shaanxi Province during 1972 and 1979, obtaining a proved copper ore reserves 10, 478, 800 tons including metal reserves 65, 064. 64 tons with an averaged grade 0.62%. There are 73 orebodies delineated in this area, 9 of which are dominant and contain 77% of the total ore reserves, including ore reserves 8, 030, 000 tons （metal reserves 49, 778 tons） with an average grade 0. 62%. The largest orebody numbered No. 7 is a blind orebody, containing ore reserves 1. 850, 000 tons （metal reserves 13, 826 tons） with an average grade 0.75%. The distribution of ore bodies are concentrated and present mostly in shapes of flat and pinch reproduction. The boundary separating orebodies and wallrocks is not clear and the ore zones vary a lot in thickness. When the ore body had a thickness less than 3m, the dilution ratio of mining would be over 50% （minimum ruinable thickness of ores in history was over 0.8 m） . When delineation of the major orebody was based on the minimum ruinable ore thickness, the dilution ratio could range between 30% and 35%, thus making sure the ore grade to be profitably selected for industry production.