Download or read book Moving Longwall Shield Supports at the York Canyon Coal Mine Raton New Mexico written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Moving Longwall Shield Supports at the York Canyon Mine Raton N Mex written by Richard H. Oitto and published by . This book was released on 1977 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Moving longwall shield supports at the York canyon coal mine Raton N Mex written by Richard H. Oitto and published by . This book was released on 1977 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Moving Longwall Shield Supports at the York Canyon Mine Raton N Mex written by Richard H. Oitto and published by . This book was released on 1977 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rock Mechanics Instrumentation Program for Kaiser Steel Corporation s Demonstration of Shield type Longwall Supports at York Canyon Mine Raton New Mexico written by Colorado School of Mines and published by . This book was released on 1981 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results of a rock mechanics instrumentation program designed to determine the rock mass response due to longwall mining a thick coal seam utilizing shield-type supports at the York Canyon Mine near Raton, New Mexico. The data collected during this study is unique in that it represents the results from mining three adjacent longwall panels varying from sub-critical to super-critical in a known geologic environment with cross- and along-panel topographic variations. Data from the program indicated the following: (1) Topography significantly influenced the magnitude and distribution of surface movements. (2) The study failed to substantiate the theory that the angle of draw decreased as the depth of overburden increased. (3) Subsidence started when the face was an average of 0.33h (h = overburden depth) from a given surface point and was essentially completed when the face was 0.9h beyond the surface point. (4) Underground mining activity produced almost instantaneous surface movement and major surface subsidence ceased almost as soon as mining ceased. (5) Topography influenced shield loading patterns only where the overburden depth was thin. (6) The width of the pressure abutment was apparently related to the depth of overburden. (7) The type of roof rock controlled the amount of roof-sag. (8) With longwall face advance, the roof tended to move away from surface topographic highs and towards the caved area. (9) Roof-floor convergence at the mining face was approximately one percent of extracted seam height. (10) The magnitude of roof-floor convergence out ahead of the mining face could be related to the face distance with a logarithmic curve function.

Download or read book Information Circular written by and published by . This book was released on 1977 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Demonstration of Shield type Longwall Supports at York Canyon Mine of Kaiser Steel Corporation Final Technical Report A written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report represents work on a program that was originated by the USBM of the Department of the Interior and was transferred to the Department of Energy on October 1, 1977. A demonstration with the Government funded Hemscheidt 320 HSL caliper type shield supports was conducted at three longwall panels of Kaiser Steel Corporation's York Canyon Mine. The purpose of this longwall demonstration was to provide the US coal industry with information on all aspects of shield longwall mining in high seams. The demonstration provided a working model for the coal industry and during the project, 350 people from the industry, schools, and government agencies visited the demonstration. They were provided with a first hand knowledge of a working shield longwall. The demonstration showed that the control of large coal lumps may be a problem in the mining of coal seam thicker than 8 feet. Mining with shield type supports provided good working conditions and a safe working environment. The shield requires very little maintenance and has a high mechanical availability.

Download or read book Demonstration of Shield type Longwall Supports at York Canyon Mine of Kaiser Steel Corporation written by Rodney G. Lawrence and published by . This book was released on 1980 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laboratory Wear Testing Capabilities of the Bureau of Mines written by Robert Blickensderfer and published by . This book was released on 1985 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Subsidence Information for Underground Mines literature Assessment and Annotated Bibliography written by Alan J. Fejes and published by . This book was released on 1985 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Department of the Interior and Related Agencies Appropriations for 1977 written by United States. Congress. House. Committee on Appropriations. Subcommittee on Department of the Interior and Related Agencies and published by . This book was released on 1978 with total page 1242 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Department of the Interior and Related Agencies Appropriations for Fiscal Year 1977 written by United States. Congress. Senate. Committee on Appropriations. Subcommittee on the Department of the Interior and Related Agencies and published by . This book was released on 1976 with total page 1244 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Department of the Interior and Related Agencies Appropriations for Fiscal Year 1977 written by United States. Congress. Senate. Committee on Appropriations. Subcommittee on Dept. of the Interior and Related Agencies and published by . This book was released on 1976 with total page 1246 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Research Abstracts written by and published by . This book was released on 1982-02 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fossil Energy Update written by and published by . This book was released on 1978 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Coal Age Second Operating Handbook of Underground Mining written by Nicholas P. Chironis and published by Coal Age Mining Informational Services. This book was released on 1980 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Subsidence written by D.J. Reddish and published by Elsevier. This book was released on 2012-12-02 with total page 541 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface subsidence is recognised as a problem in most countries, particularly those with significant mining and other underground resource extraction industries. This book addresses the problems relating to subsidence whether caused naturally, or arising from mining or other forms of underground extractive activity.The main purpose of this book is to bring together subsidence knowledge, experiences and research findings in many countries and rationalise such information especially in respect of its particular field of application. Emphasis has been given to collating field data on subsidence from different countries in order to make direct comparisons. Prediction of subsidence, particularly its occurrence and general characteristics has been seen as an important area where the book can contribute significantly in terms of reviewing available knowledge, methods, scope of application and orders of accuracy achieved. The book also examines methods of controlling subsidence and discusses the response of surface structures to and protection against subsidence.