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一、矿床地質条件分层留矿法的新方案曾先后在五个采场中試用。这些采场的地質矿床条件大致相同。矿脉厚度为0.2—0.2米,分支、复合、尖灭及侧现的现象非常扁普遍,矿石有脆性,爆破后易成粉矿。矿石硬度系数f=10—12。矿脉傾角为80—85°但有时局部变缓(60°左右)。围岩为硅化石灰岩,稳固性較大,节理及裂縫比較发达,但极少产生脫帮。围岩的硬度系數f=12—15。由于矿床含有大量硫化物,夹石中又有石膏及方解石等被水溶解后变成粘性的物質,因此,采下矿石的氧化及結块性較严重。
First, the geological conditions of stratified deposit method of the new program has been in the five stope trial. The geological conditions of these stopes are roughly the same. Veins thickness of 0.2-0.2 m, branches, composite, pinch off and the side of the phenomenon is very flat flat, brittle ore, blasting easy into powder ore. Ore hardness coefficient f = 10-12. The veins dip at 80-85 °, but sometimes locally slows down (around 60 °). Surrounding rock is silicified limestone, which is more stable, more developed in joints and cracks, but has few stripping help. Rock hardness coefficient f = 12-15. As the deposit contains a large amount of sulfide, gypsum and calcite in the stone are dissolved into water and become sticky substances, therefore, the oxidation and caking of the ore taken more serious.