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一、工程概况白马铁矿主平洞位于四川省攀枝花市米易县白马乡,平洞全长4700m,断面60．50m2,总投资1．6亿元。坍方段位于进口0+60米处,围岩为六类泥质、碳质页岩,f=0．2-2,成洞条件极差。
I. Project Overview The main flat hole of the White Horse Iron Mine is located in Baima Township, Miyi County, Panzhihua City, Sichuan Province, with a total length of 4700m and a cross-section of 60.50m2. The total investment is 160 million yuan. The slump section is located at the entrance of 0 +60 meters, the rock is six types of argillaceous, carbonaceous shale, f = 0.2-2, poor hole conditions.