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Productivity Changes in US Coal Mining-Resources for the Future. Labor productivity in U.S. coal mining increased at an average annual rate of slightly .. 3-1: Ratio ...
Productivity Changes in US Coal Mining-Resources for the Future. Labor productivity in U.S. coal mining increased at an average annual rate of slightly .. 3-1: Ratio ...
In coal mining: Choosing a mining method …calculated with the aid of stripping ratios, which represent the amount of waste material that must be removed to extract ...
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The economic stripping ratio used to define an economic mining block in an open pit coal mining situation is rationalised by considering the time value of money, and ...
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Coal mining is the process of extracting coal from the ground. ... When the operation reaches a predetermined stripping ratio (tons of overburden/tons of coal), ...
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In mining, stripping ratio or strip ratio refers to the ratio of the volume of overburden (or waste material) required to be handled in order to extract some tonnage ...
In coal mining what is a good strip ratio - Wiki Answers What Is Stripping Ratio? a. Measures relative deposit depth. Q: How important is depth in surface mining?