Anthracite latter in two or three sizes, all three being above in (38 mm) size on round-hole screens. High grade (HG) and ultra high grade (UHG) anthracite are the highest grades of anthracite coal. They are the purest forms of coal, having the highest degree of coalification, the highest carbon count and energy content and the fewest impurities (moisture, ash and volatiles). High grade and ultra high grade anthracite are harder than standard grade anthracite, and have a higher relative density. An example of a chemical formula for high-grade anthracite would be CHONS, representing 94% carbon. UHG anthracite typically has a
History of anthracite coal mining in Pennsylvania British navy blockades through during the war, industrialist Josiah White set his mill supervisors the task of experimenting with Anthracite to get to ignite and burn in a useful way. In 1813, the first mining actually in the Lehigh Valley was begun at Beaver Meadows, however, because of the various struggles getting it the to Philadelphia and because it is far more difficult to ignite Anthracite with its sporadic and unreliable supply did not come to be generally used regularly until after the War of 1812 and Hazard and White showed the way. The developments of the canal and then