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    Mineral processing, art of treating crude ores and mineral products in order to separate the valuable minerals from the waste rock, or gangue. It is the first process that most ores undergo after mining in order to provide a more concentrated material for the procedures of extractive metallurgy.

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    The control of a milling operation is a problem in imponderables: from the moment that the ore drops into the mill scoop the process becomes continuous, and continuity ceases only when the products finally come to rest at the concentrate bins and on the tailing dams.

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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 concentration of

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    1.. IntroductionIn refractory minerals and concentrates gold is present in microparticles surrounded by a layer of complex sulphides. This insoluble layer restricts the access of the cyanide used to extract the gold from the mineral, causing low metal recuperation and/or high operation costs.

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    Mulatos met the top end of 2017 guidance with production of 160,000 ounces of gold. In 2018, the mine is expected to produce between 150,000 and 160,000 ounces of gold at mine-site AISC 1 of $900 per ounce.

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    Gold extraction refers to the processes required to extract gold from its ores.This may require a combination of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore.