Injury Experience In Coal Mining 1961
![Injury Experience In Coal Mining 1961](https://ardhindie.com/assets/pdf.png)
DOWNLOAD
Download Injury Experience In Coal Mining 1961 PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Injury Experience In Coal Mining 1961 book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Injury Experience In Coal Mining 1961
DOWNLOAD
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
DOWNLOAD
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
DOWNLOAD
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
DOWNLOAD
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
DOWNLOAD
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
DOWNLOAD
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
DOWNLOAD
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
DOWNLOAD
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
DOWNLOAD
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
DOWNLOAD
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.