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目前在露天法开采多年冻结的砂矿床(含有用成分的松软沉积层)时,主要开采工艺是,随着砂矿自然解冻,用推土机分层开采后,用不大的移动式输送-擦洗机和水力提升设备进行选矿。由于存在无数体积不大和金属含量高的河床(小河和泉)砂矿,在五十～六十年代创立的、能迅速移动的输送-擦洗机及最近研制的水力提升设备,促进了这种工艺的推广。采用上述工艺还由于
At present, when the open-air method is used to mine sand deposits that have been frozen for many years (including soft sediments with composition), the main mining process is that, with the natural thawing of the sand mines, after being stratified and mined by a bulldozer, the movable mining and scrubbing machine And hydraulic lifting equipment for beneficiation. Due to the presence of innumerable small-volume and high metal content river beds (Xiaohehequan) sand mines, the rapidly moving conveyor-scrubber and the recently developed hydraulic lifting equipment, established in the 1950s and 1960s, have facilitated this process Promotion. Also use the above process