This is a coverage that shows areas in the Kaiparowits Plateauwhere geologic conditions in the Calico and A-sequences are morefavorable for current underground mining technology (Hettinger andother, 1996, fig. 22). This coverage contains nine attributes ofinformation. It was compiled by computing the geometricintersection of nine polygon coverages using the ARC/INFO UNIONcommand.This coverage is characterized as being a guide to where the morefavorable coal areas are likely to be for current undergroundmining technology: areas where coal beds in the Calico and A-sequences are greater than 3.5 feet thick, less than 3,000 feetdeep, and inclined by less than 12 degrees. Note: Coal beds lessthan 3.5 feet thick are generally not mined with today's longwalltechnology. Additionally, no more than 14 feet of coal can beeconomically mined from thicker beds. This coverage serves as anoverall picture of the distribution of coal. Additional work isrequired to determine the mineability and economics of these coaldeposits.The outside polygon defines the base of the coal-bearing John HenryMember of the Straight Cliffs Formation east of 112 degrees oflongitude. The northern boundary is delineated by the Paunsauguntfault and volcanic rocks of Tertiary age. The area within thispolygon includes parts of the coal-bearing John Henry Member wherethe entire section may not be represented due to erosion.Therefore, total coal values shown over the eroded areas representrestored net coal thicknessess.