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Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, usually those containing metals such as ore containing gold, silver, iron, copper, zinc, nickel, tin and lead, but also involves using the same techniques for excavating ores of gems such as diamonds.
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CHAPTER 1 Underground Mining Methods and Applications Production Headframe Hans Hamrin* 1.1 INTRODUCTION Ore is an economic concept. It is defined as a
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UNESCO EOLSS SAMPLE CHAPTERS CIVIL ENGINEERING Vol. II Underground Mining Methods and Equipment S. Okubo and