In 2009 the two companies mined half of the world's diamonds, measured by carat volume.
2009年，这两家公司生产的钻石按卡拉数计算占全球一半。
From the model, the spatial distribution and the volume of the residual ore at the bottom can be accurately obtained and the ore amount in the mined cavity can be calculated.
以此为基础，建立采场底部存留矿石的三维实体模型，准确地获取存留矿石在采场底部的空间分布及体积大小，进而计算出存留在采空区中的矿量。
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