The ratio of the useful component (element or mineral) in ore to the weight of ore is called ore grade. Precious metals such as gold and platinum are expressed in grams per ton, and other ores are usually expressed as percentages. Used to measure the value of ore grade ore, but also effectively gangue ore (little useless mineral or useful components in ores and minerals cannot be used) how many components and harmful impurities can affect the value of ore.
Generally divided into low-grade ore, ordinary ore and rich ore. It is sometimes divided into lean ore and rich ore, this division has no unified standard, each industry and mine have calculated the scope of their respective. According to the characteristics of useful minerals and the characteristics of their utilization, they are divided into two major categories, metal ore and nonmetal ore.. In the process of mining, the ore is lost because of the waste rock mixed with or the loss of high-grade ore, so that the ore grade is reduced. Ore depletion will increase transportation and processing costs and reduce production capacity and recovery of the ore processing unit. Such as waste rock containing harmful impurities, will also reduce the quality of the final product. Ore dilution is mainly expressed by percentage of ore dilution (ratio of industrial ore grade to ore grade and ratio of industrial grade to percentage of industrial grade).
Mineral aggregate. In modern technological and economic conditions, metals and other products can be extracted from minerals in an industrial scale. The original refers to solid material mined from metal deposits, has been extended to after the formation of accumulation in the parent rocks of sulfur, fluorite and barite, non metallic minerals.
