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我队在滇中古老变质岩地区进行勘探工作,钻进地层多属硬、脆、碎,硬度为7～11级,矿层(石英菱铁矿)及其上、下盘,节理发育,细脉穿插频繁,无粘结性.因此,钻探采心除在一般岩石与赤铁矿层应用单管钢粒钻进外,其余岩、矿层都需使用特殊的采心钻具.十多年来,我队施工的钻孔,矿心采取率都是偏低的,往往只有30%以下,一般用
Our team conducted exploration work in the ancient metamorphic rock area in central Yunnan. The drilling strata are mostly hard, brittle and broken with hardness of 7 to 11, and the orebodies (quartz siderite), their upper and lower plates, and their joint development and fine veins Intermittent frequent, non-cohesive.Therefore, in addition to drilling and mining in general rock and hematite application of single-tube steel grain drilling, the remaining rock, mining need to use a special core mining tools.For more than a decade, My team construction drilling, ore mining rate is low, often only less than 30% of the general use