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用空场法或充填法开采厚度很大的金属矿床,通常都是将矿体分成若干横向布置的矿房和间柱,第一步先采矿房,然后再回采间柱和顶底柱。这种两步或三步回采法,工艺复杂,回采周期长,采矿强度低,成本和矿石损失也较高。为了克服上述缺点,国外一些金属矿山相继推广了一种不留间柱的连续矿房式空场采矿法。现将这一方法在某些矿山的应用情况介绍如下。(一)瑞典《斯特罗萨》铁矿
Mining the thick metal deposits by the field method or filling method usually divides the ore body into several transversely arranged mines and pillars. The first step is to mine the mines and then the mines and pillars. This two-step or three-step mining method has complicated process, long recovery period, low mining intensity, high cost and ore loss. In order to overcome the above shortcomings, some foreign metal mines have successively promoted a continuous miner-type open-field mining method that does not leave space between pillars. The application of this method in some mines is described below. (A) Sweden “Strosa” iron ore