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 the building of a canal. By 1840, over 250,000 tons of anthracite mined from the region annually reached Philadelphia through White and Hazard’s Lehigh River system (Dublin, Licht, 12-3). A group of Germans wanted to seek the rights to the Schuylkill River. They received a charter in 1815 to incorporate the Schuylkill Navigation Company, which would have control over the Schuylkill River. After receiving investors the Schuylkill Navigation Company was able to finance a 108-mile long river and canal system that connected the Pottsville area to Philadelphia that opened in 1825. By the early 1840s, some 500,000 tons of anthracite