大量开采法的发展和改进,使国际镍业公司在萨德伯里的安大略分公司得以提高产量。1982年约有三分之一的矿石是用大量开采法采出的。1983年,这个比重将增加到50％以上。大量开采法中的一个主要方法是垂直后退式采矿法(VRM)。这个采矿法是国际镍业公司和加拿大工业公司一起发明的,使用漏斗爆破技术破碎矿石至合适块度,利用美国C.W.利温斯顿 The development and refinement of a large number of mining laws allowed TNI’s Ontario branch in Sudbury to increase production. About one-third of the ores in 1982 were mined using extensive mining methods. In 1983, this proportion will increase to more than 50%. One of the major methods of mass mining is Vertical Backward Mining (VRM). This mining law was invented by International Nickel Company and Canadian Industrial Corporation using funnel blasting techniques to break the ore to the proper extent using the U.S. C.W. Levingston