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埃尔·特尼恩特矿目前日产约10万 t 铜钼矿石,是世界上最大的应用矿块崩落法的矿山。矿床赋存于原岩应力很高的区域内,随着软弱次生矿的采完,开采正朝深部硬岩延伸.这就对新开采水平的设计提出一些特殊的问题,特别是岩爆灾害.在某区,1976至1980年间发生了一系列岩爆,致使2346m 水平的生产不得不放弃;若干年后又恢复生产,1987年12月在该水平下12m 处又遭到一次岩爆,摧毁面积达18000m~2.岩爆是由矿柱载荷由压变剪而产生的,因而应加大矿柱的厚度。对放矿点间距的加大进行了分析,结果表明:加大间距还将改善成本效果,因为在连续崩落中产生的不均匀料流有利于放矿点数的减少.但是最省钱的特点是矿块高度加大到260～300m,这既加大了矿石在重力流动过程中的破碎,又取消了一个中间开采水平,可节省4亿多美元.另外,本文对矿柱和巷道加固的选择也重新进行了评价。
El Tenente mine currently produces about 100,000 t of copper-molybdenum ore and is the largest mine in the world using the riprap caving method. The deposits are located in areas where the stress of the original rock is high, and mining is proceeding toward deep hard rock as the mining of the weak secondary ore completes.This raises some special problems in the design of the new mining level, especially rock burst In a certain area, a series of rockbursts occurred between 1976 and 1980, resulting in the abandonment of production at a level of 2346m. After some years of resumption of production, a rock burst at 12m was devastated in December 1987 An area of 18000m ~ 2. Rockburst by the pillars of the load generated by the pressure shear, which should increase the thickness of the pillars. The analysis shows that the increase of the spacing of the ore discharge points results in that the increase of the spacing will also improve the cost effectiveness because the uneven flow produced during the continuous caving is beneficial to the reduction of ore discharge points but the most economical feature is The height of the nugget is increased to 260-300m, which not only increases the crushing of the ore during the gravity flow but also cancels an intermediate mining level, which can save more than 400 million U.S. dollars. In addition, the selection of pillar and roadway reinforcement Also re-evaluation.