论文部分内容阅读
箇旧矿区地层的特点是:节理发育,破碎坍塌掉块(矿化带和接触变質带尤其突出),井壁极不稳定,这种岩层約占整个地层的50～60％;矿层較多且厚,类型也广(如:氧化矿、硫化矿、含矿矽卡岩、矿化大理岩、白云岩、冲积砂矿和地表氧化砂锡等),且有部分矿体分布很不规律,結构产状难以掌握(如网状矿体),矿层占施工岩层5～8％,普通Ⅳ～Ⅵ级中、粗、微晶大理岩、白云岩占20～25％;坚硬岩层(Ⅶ～Ⅺ)花岗岩、矽化灰岩、矽卡岩、硫化矿、长英石、石英脉占10％左右;喀斯特现象极为突出,地下溶洞,大空硐、裂隙、大断层、民窿較多,几乎每
箇 The features of the old mining strata are that the joints developed and crushed and collapsed (especially in the mineralized belt and the contact metamorphic belt), and the borehole wall is very unstable. This kind of strata occupies 50-60% of the total strata; And the type is also wide (such as: oxide ore, sulfide ore, mineralized skarn, mineralized marble, dolomite, alluvial sand and surface oxidation of tin oxide, etc.), and some ore body distribution is very irregular, (Such as reticular orebodies), the ore layer accounts for 5 ~ 8% of the construction rock formation, and the coarse and microcrystalline marble and dolomite accounts for 20 ~ 25% of the ordinary Ⅳ ~ Ⅵ rock. Hard rock formations (Ⅶ ~ Ⅺ ), Granite, limestone, skarn, sulfide ore, feldspar, quartz veins accounted for about 10%; Karst phenomenon is extremely prominent, underground karst cave, big cave, fissures, large faults,