chapter  8
41 Pages


At the beginning of Chapter 1, ‘ore’ was defined as: Ore: A natural aggregation of one or more solid minerals that can be mined, processed

and sold at a profit. The meaning of ‘profit’ was defined very simply in Equation (1.1) as

Profits = Revenues − Costs (1.1) Replacing ‘revenues’ and ‘costs’ by their equivalent expressions in Equation (1.1), one obtains Equation (1.4).