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在马格马铜矿,由于复杂的围岩条件,迫使它采用下向充填采矿方法,所用充填料是水泥和选矿厂的分级尾砂以及磨碎的炉渣的混合料。在22英尺垂直间隔的分段巷道上进行采矿。沿走向掘进10英尺宽的进路,並在完成几条进路之后就铺设包括纵向梁、横柱和金属网的垫层。在首先充填3英尺高的充填体中,尾砂和炉渣与水泥的比例是16:1,其余部分是28:1或35:1。在一个分段巷道上完成了采矿和充填作业时,采矿就转入下一个分段水平。梁和其它支护结构被包在充填体内,因此提供了比在原岩下作业更安全更快的采矿条件。这个方法可得到近乎100％的回采率和有限的貧化。到目前为止,对马格玛矿体是一个最成功的方法。
At the Magma copper mine, due to the complex surrounding rock conditions, it was forced to adopt a down-fill method using a mixture of graded tailings from cement and concentrator and ground slag. Mining is carried out on segmented roadways spaced vertically at 22 feet. Drive along a 10-foot-wide approach and lay down cushions that include longitudinal beams, cross-columns and metal meshes after completing several passes. Tailings and slag to cement ratios are 16: 1 in the first 3-foot-filling and the rest 28: 1 or 35: 1. When mining and filling operations are completed on a staged roadway, mining moves to the next level of sectioning. Beams and other support structures are encased in the fill body, thus providing safer and faster mining conditions than under the original rock. This method yields nearly 100% recovery and limited depletion. So far, one of the most successful methods has been the Magma Ore.