Calculating Stockpile Capacity: Once the minimum storage capacities which will assure maximum mill output are known, the appropriate stockpile configuration must be determined. Stockpiles fall into two general categories: conical and elongated.
The conical stockpile is the simplest and easiest to analyze. The total stockpile capacity is given by:
3.14 (Tan A)R³ D/3000 = capacity in metric tons…………………(1)
where: R = stockpile radius in meters
A = angle of repose for material to be stockpiled
D = density of material in kg/m³
Note that the capacity of the conical stockpile varies with the cube of the radius of the pile. This means that the capacity of the conical pile grows very rapidly as the height (and hence the radius of the pile) increases. Increasing the height of the stockpile by 26% results in a doubling of the stockpile capacity. One should also observe at this point that one-half of the capacity of the stockpile is in the lower 1/5 of the pile. This fact will become important later in considerations of live storage capacity.
For many common materials, the angle of repose, A, is about 38 degrees. Substituting this value for A reduces Equation 1 to:
8.18 x 10 -4 ….Read more