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In the mining process, some waste rock is mixed into the ore, so the ore that is taken out must be lower than the grade of the industrial ore that is taken. This process is called depletion.
The degree of depletion is usually expressed as the depletion rate Ï.
The depletion rate also has an actual depletion rate and an apparent depletion rate.
The apparent depletion rate is represented by Ï'. It refers to the percentage reduction in ore grade after harvest.
Ï'=[(a-a')/a]×100%
Where a-original industrial ore grade;
a'-The grade of the ore after the harvest.
The actual depletion rate refers to the percentage of mixed waste rock and collected ore (including waste rock mixed in).
Ï=(R/Q')×100%
Q'-the amount of ore collected (including the waste rock mixed in);
The amount of waste rock contained in the ore mined by R-.
If expressed in terms of quality indicators, the above formula is written as:
Ï=[(a-a')/(a-a")]×100%
In the formula a" - the grade of waste rock.