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我矿已有六十多年的开采史。井田地质构造比较复杂,断层纵横交错,岩质松软破碎,其吸湿性、膨胀性很大。从1968年以来,至今有2万多米巷道采用了锚杆支护,这些巷道有玄武岩,凝灰岩和页岩,巷道断面5.4～6米~2;跨度2～11、4米,高度2～9.7米。此外,还用锚杆支护的三角点30多处、300马力纹车房4个。这些巷道经受了3～4年的地压考验,没有坍塌冒顶现象。
Mine has more than 60 years of mining history. Ida geological structure is more complicated, criss-cross the fault, rock soft broken, its hygroscopicity, expansibility. Since 1968, up to now, more than 20,000 meters of roadways have been used for bolting. The roadways have basalt, tuff and shale. The roadway section is 5.4-6 m ~ 2; the span is 2 ~ 11.4 m and the height is 2 ~ 9.7 Meter. In addition, there are more than 30 triangular points supported by bolts and 4 horsepower workshops of 300 horsepower. These roadways have been subjected to the earth pressure test for 3 to 4 years without collapse and roof collapse.