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Established as a Division September 27, 1949 LeRoy Scharon, Chairman C. M. Cooley, Secretary 29 West 39th Street New York 18, N Y

Jan 1, 1952

Jan 1, 1913

Jan 1, 1892

Jan 1, 1949

By M. G. Spengler

A new type of pack has been developed primarily for the support of narrow stopes. It was shown in the laboratory that it has characteristics that very closely approximate the optimum required by underground support to achieve hangingwall stability.

Jan 1, 1978

Jan 1, 1934

Jan 1, 1922

Jan 1, 1947

Jan 1, 1949

Jan 1, 1930

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Jan 1, 1938

Jan 1, 1902

Jan 1, 1920

Dr. George Ferdinand Becker, a prominent geologist, connected with the United States Geological Survey since 1879, died at his home in Washington, D. C., Apr. 21, at the age of seventy-two.

Jan 5, 1919

Jan 1, 1914

Jan 1, 1940

By William F. Skully

An effective explosives storage program involves selection of a storage site, checking zoning and special permit requirements, acquisition of the storage site land, determining correct layout for required storage units, selection of storage units, construction of storage area, obtaining licenses and permits, and storage site operation.

Jan 1, 1976

The development of coal mining in this state has been well described by Goodyear, and much data are also given in the reports of the U. S. Commissioner of Mining Statistics, and the tonnages in Table 69 are from these sources, only a few of them being estimated. [ ]

Jan 1, 1942

To develop a comprehensive, practical method for designing longwall gate entries that considers coal pillar size, mine roof quality, and artificial support in an easy-to-use computer program.

Jan 1, 1995

The Effect of Grinding Aids on Laboratory Grinding of a Cassiterite-Polymetallic Sulfide Ore

Sep 13, 2010