With a proliferating world population, and the desire for improving standards of living, demand for the products of mining is increasing. At the same time the price that society is willing to pay for these products is generally static, if not decreasing in real terms. Much of the world has already been explored, and the more obvious and simpler-to-mine deposits have been exploited. Cost-effective production of current workings, and planning of future exploitation, require sensible and reproducible estimates of distribution, grade, and tonnage of ore in place. These estimates, which often have legal implications, have to be produced against a...

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