stripping ratio | mining | Britannica.great depths that it becomes uneconomical to continue with surface mining. . Stripping ratios can also consider the selling price of coal, and a certain.what is stripping ratio coal mining,Calculating Stripping Ratios for Area Strip Mines . - paulywogbog“Elements of Practical Coal Mining” and SME's “Surface Mining” were specifically referenced . Stripping Ratio determines relative amounts of each to be moved.