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<br />f'V <br />~ <br />~ <br />~ <br /> <br /> <br />- <br /> <br />Anthracite & se~i-anthrac1te <br /> <br />~ <br /> <br />Lov-volatile bituminous coal <br /> <br />~ <br />~ <br /> <br />_n'." <br /> <br />,.,..,...., <br />"0..'."'"..' <br /> <br />Medium & high-volatile bituminous coal <br /> <br />1:,:'.">'1-:,,:',1 <br /> <br />Subbituminous coal <br /> <br />Dark color represents areas known to contain <br />coal beds of present or future co~erclal <br />value. In g~neral, the minimum thicknesses <br />of beds incl~ded are 14 inches far bituminous <br />coal and anthracite an~ 30 inches for sub- <br />bituminous coal and lignite. <br /> <br />Light color represents areas In which coal <br />beds are generally less chan the minimum <br />th1ckne$ses or are deeply buried 1n the <br />center of structural basins or are covered <br />by younger noneoal-bearing rocks. <br /> <br />Note, however, that map is <br />from 1971, and more recent <br />studies in San Juan and <br />Rio Arriba counties, New <br />Mexico, shoy addition~l <br />coal deposits of possi- <br />ble commercial value <br />in that area. <br /> <br />Source: Upper Colorado Region State-Federal Inter-Agency Group/Pacific <br />Southwest Inter-Agency Committee/Water Resources Council, <br />Upper Colorado Region, Comprehensive Framework Study, Appendix <br />VII, Nineral Resources, June, 1971, p. 12. <br /> <br />FIGURE 2.7: GENERAL MAP OF COAL DEPOSITS <br />IN THE UPPER COLORADO RIVER REGION <br /> <br />2-11 <br />