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一、引言个旧矿区砂锡矿资源丰富,分布甚广,赋存于海拔标高1300～2500米的喀斯特地形的坡地和山洼盆地中,无覆盖层、矿石粒度小,含泥最高,具有露天水力机械化开采的有利条件。但解放前,公司以开采高品位脉矿为主,砂锡矿基本没有利用,解放后,才得到迅速发展。开采方法先后经过土法,机采机运,机采
I. INTRODUCTION The sand and tin mine in Gejiu Mining Area is rich in resources and widely distributed. There are no overburden layers in the karst terrain and the mountainous depression basins with an altitude of 1300 to 2500 meters. The mine has the features of small grain size and highest mud content, and has open-air hydraulic mechanization Mining favorable conditions. Before the liberation, however, the Company mainly exploited high-grade vein veins and basically did not make use of it. After its liberation, it rapidly developed. Mining methods have been through indigenous methods, machine mining machine transport, machine mining