Both anthracite and bituminous deposits have been found.
M., and comprise a valuable stock of excellent anthracite and coal, together with iron-mines.
The chief anthracite beds, those in the Gorjiu department, are leased until 1975 to an English capitalist, who has the right to construct railways.
In graphitizing en masse large lumps of anthracite are treated in the electric furnace.
They are rarely metamorphosed to the point of recrystallization, though locally shales are altered to roofing slates, sandstones are indurated, limestones slightly marblized, and coals, originally bituminous, are changed to anthracite in northern Pennsylvania, and to graphite in Rhode Island.
In the manufacture of calcium carbide in the electric furnace, lime and anthracite of the Manufac- highest possible degree of purity are employed.
In the valley of the Bow river, alongside the Canadian Pacific railway, valuable beds of anthracite coal are worked, and the coal is carried by railway as far east as Winnipeg.
Pittston is in the midst of the richest anthracite coal region of the state, and fire-clay also abounds in the vicinity.
Coal, chiefly bituminous, occurs in large quantities in Nova Scotia, British Columbia and in various parts of the north-west (lignite), though most of the anthracite is imported from the United States, as is the greater part of the bituminous coal used in Ontario.
Coke or anthracite is heated to incandescence by an air blast in a generator lined with fire-brick, and the heated products of combustion as they leave the generator and enter the superheaters are supplied with more air, which causes the combustion of carbon monoxide present in the producer gas and heats up the fire-brick baffles with which the superheater is filled.