Bureau of Mines / Minerals yearbook: Fuels 1957
Year 1957, Volume II (1959)
Young, W. H.; Anderson, R. L.; Hall, E. M.
Coal--bituminous and lignite, pp. 41-137 ff. PDF (9.8 MB)
General summary Scope of report Reserves___________________ Thickness of bituminous-coal and lignite seams_______________ Domestic production Production by months and weeks__________________ Summary by States Number and size of mines Employment and productivity - - Underground mining Strip mining Auger mining Mechanical loading Mechanical cleaning_________ Page 41 42 44 46 49 51 57 60 63 65 69 85 87 95 Page Domestic production—Con. Mechanical crushing 101 Treatment for allaying dust 104 Production by States and counties 107 Transportation 116 Consumption 120 Relative rate of growth of min eral fuels and waterpower 123 Stocks 124 Prices 125 Lignite 127 Foreign trade 128 World production 131 Coal technology 134 491862—59-——-4 41PART II. COMMODITY REVIEWS A1 Coal and Related Products CoaI~-Bituminous and Lignite By W. H. Young, R. L. Anderson, and E. M. Hall + Contents GENERAL SUMMARY THE BITUMINOUS-COAL AND LIGNITE INDUSTRY declined slightly in 1957 compared with 1956. Production, consumption, and days worked decreased; however, average value and exports increased. Mechanization continued to expand during the year, sales of continuous mining machines increased, and the percentage of underground production mechanically loaded and tons per man per day rose to new highs. Production.—The output of bituminous coal and lignite in 1957— 492.7 million tons—was 2 percent less than the 500.9 million tons produced in 1956. The lower production in 1957 was due largely to decreased consumption in the United States as a result of a general decrease in business activity. Production fluctuated very little during 1957. The only major fluctuation resulted from the miners' vacation period of 9 days in midsummer. According to the Bureau of Labor Statistics, United States Department of Commerce, time lost on account of strikes amounted to 136,000 man-days in 1957, compared with 377,000 in 1956. Trend of Employment.—Employment increased slightly in 1957 compared with 1956. Index to Capacity.—As it is impossible for all mines to operate every working day in the year, a conservative figure of 280 days for calculating potential capacity was suggested some years ago by the coal committee of the American Institute of Mining, Metallurgical, and Petroleum Engineers. The average output per day worked in
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