With the depletion of sulfide nickel mineral resources, the boom of exploration and utilization of laterite-nickel mine arrived.
随着硫化镍矿资源的日益枯竭，红土镍矿的开发利用热潮已经来临。
With the depletion of high grade copper mineral resources, it has become very urgent to develop the discarded copper tailings.
随着高品位铜矿资源的日趋枯竭，高效开发铜尾矿变得越发迫切。
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