Injury Experience In Coal Mining 1961

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Injury Experience In Coal Mining 1961

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Author : Forrest Theodore Moyer
language : en
Publisher:
Release Date : 1963

Injury Experience In Coal Mining 1961 written by Forrest Theodore Moyer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with Coal mine accidents categories.

Injury Experience In Coal Mining

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Author :
language : en
Publisher:
Release Date : 1989

Injury Experience In Coal Mining written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Coal mine accidents categories.

Injury Experience In Coal Mining 1959

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Author : John C. Machisak
language : en
Publisher:
Release Date : 1961

Injury Experience In Coal Mining 1959 written by John C. Machisak and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Coal mine accidents categories.

Injury Experience In Coal Mining 1966

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Author : Forrest Theodore Moyer
language : en
Publisher:
Release Date : 1969

Injury Experience In Coal Mining 1966 written by Forrest Theodore Moyer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Coal mine accidents categories.

Injury Experience In Coal Mining 1958

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Author : John C. Machisak
language : en
Publisher:
Release Date : 1961

Injury Experience In Coal Mining 1958 written by John C. Machisak and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Coal mine accidents categories.

Injury Experience In Coal Mining 1960

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Author : John C. Machisak
language : en
Publisher:
Release Date : 1962

Injury Experience In Coal Mining 1960 written by John C. Machisak and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Coal mine accidents categories.

Injury Experience In Coal Mining 1953 54

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Author :
language : en
Publisher:
Release Date : 1958

Injury Experience In Coal Mining 1953 54 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1958 with categories.

Injury Experience In Coal Mining 1965

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Author : Forrest Theodore Moyer
language : en
Publisher:
Release Date : 1968

Injury Experience In Coal Mining 1965 written by Forrest Theodore Moyer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Coal mine accidents categories.

Injury Experience In Coal Mining 1963

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Author : Forrest Theodore Moyer
language : en
Publisher:
Release Date : 1966

Injury Experience In Coal Mining 1963 written by Forrest Theodore Moyer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Coal mine accidents categories.

Injury Experience In Coal Mining 1961

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Author : Erle C. Donaldson
language : en
Publisher:
Release Date : 1963

Injury Experience In Coal Mining 1961 written by Erle C. Donaldson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with Chromite mines and mining categories.

The Mouat mine, Nye, Mont., was reopened in 1953 by the American Chrome Co. under a Defense Minerals Production Administration contract. Operations were terminated in 1961 after completion of the contract. Mining methods employed during this period are described in detail, and cost data are presented by years for 1953 through 1959. Ultramafic rocks of the Stillwater complex in Montana contain the largest domestic resource of chromite, and the Mouat mine has been the largest producer. Mine reserves were estimated in 1960 to be about 4.4 million tons containing 22.5 percent Cr203. The chromite deposits occur as a series of overlapping bands or lenses roughly paralleling the steeply dipping layers of the complex. Only two of the chromite layers have proven to be of economic importance. One layer is 2 to 1.6 feet wide; the other is 3 to 8 feet wide. Shrinkage stoping was generally used throughout the mine, but various methods of ore breaking, scope drawing, chute construction, etc., were tested to improve output and lower costs. Long-hole stoping proved to have limited use. Breasting down benches, developed outward from the center of the stope with air-leg drills, was satisfactory only in wider scopes. At the close of operations, the company had standardized the use of lightweight stopers to advance a flat back by breaking from a centrally located face. Mining costs were reduced 47 percent during 7 years of operation.