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(一) 据冶金部统计资料,1979年我国重点矿山铁矿石总产量中露天开采的实际比重已达90.2％。另据冶金部远景规划资料,当我国年产一亿吨钢时,在将要扩建与新建的年产矿石500万吨以上的铁矿山中,露采的比重将为93.2％。我国铁矿资源多为急倾斜厚矿体,规划中90％以上的露天矿均属采深(指地面封闭圈以下)大于100米的凹陷矿,其平均采深为320米,平均最终边坡垂高达483米。我国有色金属矿的露采比重也将迅速增长。
(I) According to statistics from the Ministry of Metallurgy, the actual proportion of open-pit mining in the total output of iron ore in key mines in 1979 in China reached 90.2%. According to the Metallurgical Bureau long-range planning data, when our country produces 100 million tons of steel annually, the proportion of open mining in the iron mines to be expanded and newly built with an annual output of over 5 million tons of ore will be 93.2%. Most of China’s iron ore resources are steeply inclined thick ore bodies. Over 90% of the open-pit mines in the planning are all hollow mines with mining depth greater than 100 meters (referring to the enclosed area below the ground) with an average depth of 320 meters. The average final slope Hang up to 483 meters. China’s non-ferrous metal mining proportion will also be rapidly increasing.