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在第三次扩建完成之后,为了寻求更低的单位成本使得皮马矿业公司的管理部门一直没有停止研究各种选择方案。六个月的半工业自磨和半自磨试验,取得良好的成果。1970年8月作出开工的决定。1971年12月新的选矿厂投产。1972年3月已达到14000吨/日的设计能力。前三次在皮马矿业公司的扩建,从3000吨/日到36000吨/日。这些扩建包括普通的分开的三段破碎厂和另加的现在的重复利用当前流程的选矿厂。第四次扩建由新的、分开的第一段破碎厂和一个位于老选厂东南2000呎的
After the third expansion, the management of the Pima Mining Company has never ceased to study options in search of lower unit costs. Six months of semi-industrial self-grinding and semi-self-grinding test, and achieved good results. August 1970 to make the decision to start. 1971 December new concentrator production. March 1972 has reached 14,000 tons / day design capability. The first three additions at the Pima Mining Company, from 3,000 tons / day to 36,000 tons / day. These expansions include ordinary, separate three-stage crushing plants and an additional now-existing concentrator that reuses the current process. The fourth expansion consisted of a new, separate first-stage crushing plant and a 2,000-foot southeast of the old plant