. Transactions. the men of that class who have in recent years entered themines. The Engineering Committee has proved all these questions aspossible of solution. COAL MINING IN WASHINGTON 371 Coal Mining in Washington BY F. A. HILL,* SEDRO-WOOLLEY, WASH.(Colorado Meeting, September, 1918) Coal mining in the State of Washington offers many interesting prob-lems for the mining engineer, due to the varied physical conditionsoccurring in different fields, and often in the same mine. The differentcoal seams worked in the same mine commonly require different miningand transportation methods for econ
. Transactions. the men of that class who have in recent years entered themines. The Engineering Committee has proved all these questions aspossible of solution. COAL MINING IN WASHINGTON 371 Coal Mining in Washington BY F. A. HILL,* SEDRO-WOOLLEY, WASH.(Colorado Meeting, September, 1918) Coal mining in the State of Washington offers many interesting prob-lems for the mining engineer, due to the varied physical conditionsoccurring in different fields, and often in the same mine. The differentcoal seams worked in the same mine commonly require different miningand transportation methods for economical operation. The coal meas-ures have inclinations ranging from 5° to vertical, and in the same minethe dip of the coal may vary from 30° to 50°. In all fields, the seams areextensively faulted, folded, and sheared. The quality of the coal produced ranges from brown lignite to bitu-minous coking coal, the following being typical analyses: Lignite Coking Coal Moisture Volatile hydrocarbon Fixed carbon Ash. Very little of the coal contains as much as per cent, sulfur. The brown lignites occur mostly in Lewis and Thurston Counties, andas a rule are very cheaply mined. This coal has been successfully used inlocomotives of the Oregon & Washington Railroad, after equipping themwith specially designed fireboxes. The sub-bituminous coals occur in all the coal-mining counties. Theircost of production varies widely, according to the character of the forma-tions, the pitch, and the wall conditions. This makes a fairly good steamcoal, but the lump is used mostly for domestic trade, after grading intolump, nut, and pea. The coking coal is used for making coke, and for locomotive and otherboiler fuel. It yields a strong metallurgical coke, quite high in ash,though seldom exceeding 18 per cent. ash. Most of it is susceptible to Manager, Cokedale Coal Co. 372 COAL MINING IN WASHINGTON better cleaning than it now receives, but it will be difficult, from any seamsnow known, to
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
