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芒特艾萨矿山有限公司的铅、锌、银矿石的开采开始于1925年,第二次世界大战期间有短时间停产。1953年以来已开采铜矿体,现在仅从深部规模很大的1100矿体开采铜矿石,于1967年开始从这个矿体回采矿石。铅、锌、银矿石是从较下部水平约20个急倾斜的厚度和间距不等的板状矿体中开采出来的。其中有些矿体已经生产了二十年。在1100矿体中,最初的生产是从按规则网格布置的用沿整个矿体高度具有垂直矿壁的分段空场法采场回采的。这些采空场嗣后用廢石胶结充填以利用回收矿柱。矿柱的回采包括使用在廢石充填情况下的分段崩落法,大爆破空场法或大爆破和在廢石充填下放矿的采矿法。铅矿体的采矿方法取决于它的宽度和围岩的稳固性,但包括采用用以回收垂直矿柱的分段空场法或机械化分层充填法。空场之间的矿柱回收用在廢石充填下放矿的分段崩落法或用大爆破的空场法。前者空场采用非胶结的廢石充填,后者则需要胶结水力充填。用于开采狭窄矿体的分层充填法,要求水砂充填的正规作业。在充填方法中,特别要注意的一个方面是把分级的廢石从采石场输莲到采空场的一定位置,以及用铜反射炉渣来代替部分用于胶结水力充填中的波特兰水泥。充填研究的中心问题,在于确定胶结廢石充填的性质和发展计算机程序应力分析以预测胶结充填特性。增加铜反射炉渣使用的研究以及开拓一个泵送小于25毫米的集料组成的坑内胶结充填料系统也已进行。
Mining of lead, zinc and silver ores in Mount Isa Mine Co. began in 1925 with a short shutdown during World War II. Copper mines have been mined since 1953 and copper ore is now mined only from the large, deep 1100 ore body and from 1967 the ore was recovered from this ore body. Lead, zinc and silver ores are mined from about 20 steeply slabbed slabs of unequal thickness and spacing from the lower level. Some of these ore bodies have been produced for two decades. In the 1100 ore body, the initial production was taken from a regular grid of staged stopes with vertical walls along the entire ore body height. These mined-out fields are subsequently filled with waste rock cements to utilize recovery pillars. Mining of pillars includes the use of sub-caving methods in the case of waste rock fill, large blasting or large blasting and the mining method of releasing ore under waste rock fill. The method of mining a lead orebody depends on its width and the stability of the surrounding rock, but includes the use of a segmented open field method or a mechanized stratified filling method for recovering vertical strands. Recovery of pillars between the open fields is carried out by the sub-caving method of releasing ore under waste rock fill or the open-field method using a large blasting. The former is filled with non-cemented waste rock and the latter requires cemented hydraulic filling. Stratified filling method for the exploitation of narrow ore body requires regular operation of water sand filling. One area of particular interest in filling methods is the grading of waste gravel from the quarry to the mined-out site and the substitution of copper-reflecting slag for part of Portland cement used in cemented hydraulic filling . The central issue of filling research lies in determining the nature of the cementing waste rock fill and developing computer program stress analyzes to predict the cementing properties. Research to increase the use of copper reflective slags and to develop an in-celled cement filler system that pumps aggregates of less than 25 mm has also been conducted.