The grade of the ore is the amount of a metal or useful component contained in the ore, generally expressed as a percentage of the ore grade.
Most of the metals, such as iron, copper, lead, zinc and other minerals, are represented by the weight percentage of the metal element content;
Some metal ore grade is the oxide (such as tungsten trioxide, five of two vanadium etc.) the weight percentage;
Majority of non-metallic mineral raw material is in the useful minerals or compounds of weight expressed as a percentage, such as potassium salt and alum stone;
Some non metallic minerals depend on the physical and chemical properties of the mineral, such as crystals and gems;
The precious metal ore in grams / tons;
Primary diamond ore in carats / tonne or mg / t represents (1 carat = 0.2 g);
Placer in grams / cubic meter or kg / m to represent.
The grade of the ore shall be determined by the results of the sample tests.