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
Anthracite iron States, in the principal control and supervision of Ironmaster David Thomas who had begun experimenting with attempts to use locally available Wales anthracite deposits as early as 1820 soon after he became in charge at Yniscedewin Iron Works in Wales. About this 1837-38 timeframe experiments were also being made in Pennsylvania near Port Carbon, and in Mauch Chunk, but with overall better success than in Wales. White, Hazard and the LC&N Co. had begun systematic experiments to smelt using anthracite in two furnaces in Mauch Chunk in 1832-1837 with intermittent but sporadically improved successes using cold blast processes with two