在威特沃特斯兰德金矿区采矿初期,相当普遍地采用水砂充填和石墙支护。然而,由于成本太高,于50年代初期已开始停止采用这类支护方法。众所周知,S.J.帕切特博士于1976年就开始深入研究南非金矿的充填问题,并反复试验研究加水泥或不加水泥的高浓度(含78％的固体物料)脱水全尾砂的浇注问题。可是,高浓度充填料脱水系统不受欢迎,这倒不是系统本身的性能问题,其实这种系统的性能极好,而是由于下述原因:1.脱水系统的基建费用和生产费用高; In the early stages of mining at the Witwatersrand Goldfield, water sands and stonewalling were fairly common. However, due to the high cost, such support methods have begun to be discontinued in the early 1950s. It is well-known that Dr. S.J. Pachart began to study in depth the gold filling problem in South Africa in 1976 and repeated trial studies on the pouring of dehydrated tailings with or without cement at high concentrations (containing 78% solids). However, the high concentration of filling dewatering system is not welcome, this is not the performance of the system itself, in fact, the performance of this system is excellent, but because of the following reasons: 1. Dewatering system infrastructure costs and high production costs;