Assume an underground mining cost of $25.5/ton ore for an orebody. assume open pit mining costs at $0.0028/kg ore removal and $0.0035/kg waste removal. determine the stripping ratio for an open operation that results in break-even cost differential between the two mining methods.

Analyze the map below and answer the question that follows. image by mdf the map projection above was created using mathematical formulas to calculate distances. it has a small amount of distortion. which map projection is shown in this image? a. the goode projection b. the political projection c. the mercator projection d. the winkel tripel projectio

What is the pattern of urbanisation around the word?

Which layer surrounds the center of the earth? a: crust b: core c: mantle