A more accurate method for estimating in situ coal density and mineral matter from ash and specific energy determinations

This method has several advantages over existing techniques. It is valid for all values of ash, with no loss in accuracy outside a limited range. The scatter caused by mineral volatiles is reduced, resulting in a much higher correlation coefficient. Coal and mineral densities derived from the formula may also provide insight into the coal maceral and mineral types present within a project, as well as changes in mineralogy with ash content.