Current State of the Coal Industry in Wyoming - wyogeo.org
WYOMING COAL MINE QUALITY Mine Names Moisture %(As received) 2013 state mine inspector production (tons) Employees (2013) Ash % (As received) Sulfur % (As received) Stripping Ratio (bank cubic yards/ton) 10. NARM (North Antelope Rochelle Complex Mines) 111,005,549 1,340 3.88-4.28 0.2 3:1 to 2:1 11. Rawhide Mine 14,246,329 203 0.37 1.6 12.Modern Coal Mining Methods - Alison,Modern Coal Mining Methods Text Version Once the geological data gathered during the exploration phase has been evaluated, geologists will estimate the quality and quantity of coal present.Chapter 2: The Environmental Effects of Strip Mining - The,,This process continues along parallel strips of land so long as the ratio between the overburden and the coal seam, called the stripping ratio, makes it economically feasible to recover coal. Mining may cease in a particular area, for example, where the coal seam becomes thinner or where the seam dips further below the surface.