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面山区矿体厚度2～12米,倾角50～60°,走向北20--50°西,走向长1600～2000米,倾向与东北部山坡相反;地表山坡倾角一般在40°以上,山顶至下部的金沙江面高差2200米。矿体上盘及山头皆为白云岩,中等稳固(地表岩层受构造破坏欠稳固);下盘为紫色砂岩,很稳固。采用分段空场法回采,矿房及底柱、壁柱用垂直扇形孔落矿,顶柱用水平扇形孔落矿。矿柱回采后上盘围岩及上中段复盖岩石大都能跟随冒落。底柱厚4～6米,壁柱宽8
The thickness of the ore body in the mountainous area is 2 ~ 12 meters and the dip angle is 50 ~ 60 °, and it is 20 - 50 ° westward and 1600 ~ 2000 meters long. The inclination of the ore body is opposite to that of the northeastern part. The inclination of the mountain slope is generally above 40 °, The lower part of the Jinsha River surface height of 2,200 meters. The orebodies and hills are all dolomite, moderately stable (the surface rock is structurally unstable and underdeveloped), and the lower plate is purple sandstone, which is very stable. The use of sub-step empty field mining, mining and the bottom column, pilasters with vertical fan-shaped hole, the top column with horizontal fan-shaped hole. Pillar rock after mining on the plate and the upper middle can cover the rock to follow the fall. The end of the column thickness of 4 to 6 meters, pillars wide 8