1980年以前,大义山有色矿的浮选老尾矿(堆积于一尾矿库)平均含锡0.297％。1982年10月投产一座日处理能力为70～100吨的简易选厂,一年多来,已回收锡金属31.254吨,增益55万多元。现有可资利用的老尾矿量约3.3万吨,锡储量近百吨。 (一)矿石性质老尾矿属均质细砂类,最大粒度0.2毫米,-0.074+0.037毫米占30％, Prior to 1980, the flotation tailings of Dayi Mountain Non-ferrous Mine (deposited in a tailing pond) contained an average of 0.297% tin. In 1982 October put into operation a daily processing capacity of 70 to 100 tons of simple processing plant, over the past year, has been recycled tin metal 31.254 tons, more than 550,000 yuan gain. Existing available for the use of the old tailings about 33,000 tons, nearly 100 tons of tin reserves. (A) the nature of the ore The old tailings are homogeneous fine sand, the maximum particle size of 0.2 mm, -0.074 +0.037 mm accounted for 30%