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Chapter 74 - Mining and Quarrying MINING: AN OVERVIEW Norman S. Jennings Minerals and mineral products are the backbone of most industries. Some form of mining or quarrying is carried out in virtually every country in the world. Mining has important .
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Are these grades good? The following are considered 'high grades' for the purposes of most North and South drilling programs: G reater than 5 g/t gold and 15 g/t silver (NOTE: this was the company's version of what a high grade means, and they specifically .