Ores are also classified by the nature of their gangues, such as calcareous or basic (lime rich), or siliceous, or acidic (silica rich).
矿石还根据脉石的性质进行分类，例如钙质或碱性（富含石灰），硅质或酸性（富含二氧化硅）。
The minimum metal content required for a deposit to qualify as an ore varies from metal to metal.
矿床符合矿石的最低金属含量因金属而异。
Many nonferrous ores contain, as mined, as little as 1 % metal, and often much less.
许多有色金属矿在开采的时候含量低至1%，而且通常更少。
Gold may be recovered profitably in ores containing only 5 parts per million (ppm) of the metal, whereas iron ores containing less than about 20 % metal are regarded as low grade.
在含金量仅为百万分之五的（ppm）的矿石中，可获得利润丰厚的黄金，而金属含量低于20%的铁矿石被视为低品位。
There are many plants where minerals are recovered in secondary circuits, treating tailings, where the feed grades are much lower than would be economic on a mined ore.
有许多工厂的入料来自二次回路和处理的尾矿，其入料品位远低于开采矿石的品位。
Typical ore grades for tungsten ores are in the range of 0.5% ~ 1.5% WO3, but the Climax Molybdenum plant in the United States treats 45000 tonnes per day of tailings, containing less than 0.1% WO3, and is one of the two major producers of tungsten concentrate in the United States.
钨矿石的典型品位为0.5% ~ 1.5% WO3，但是美国的Climax钼厂每天处理45000吨尾矿，其中WO3含量低于0.1%，是美国两大钨精矿生产商之一。
Non-metallic Ores
Ores of economic value can be classed as metallic or non-metallic, according to the use of the mineral.
有经济价值的矿石按用途可分为金属矿和非金属矿。
Certain minerals may be mined and processed for more than one purpose.
某些矿物可能出于多种目的而被开采和加工。
In one category the mineral may be a metal ore, i.e. when it is used to prepare the metal, as when bauxite (hydrated aluminium oxide) is used to make aluminium.
在一个类别中，矿物可以是金属矿石，即当用它来制备金属时，就好像当铝土矿（水和氧化铝）用来制备铝时一样。
The alternative is for the compound to be classified as a non-metallic ore, i.e. when bauxite or natural aluminium oxide is used to make material for refractory bricks or abrasives.
另外一种方案是将化合物归类为非金属矿石，即使用铝土矿或天然氧化铝制成耐火砖或耐磨材料。
Many non-metallic ore minerals associate with metallic ore minerals and are mined and processed together, e.g. galena, the main source of lead often associates with fluorite (CaF2) and barytes (BaSO4), both important non-metallic minerals.
许多非金属矿物与金属矿共生，并在一起开采和加工，如方铅矿，铅的主要来源，往往与萤石（CaF2）和重晶石（BaSO4）伴生，这两种矿物都是重要的非金属矿物。
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