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The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

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Longwall and Room-and-Pillar Productivity: A Review of U.S. Coal Mines.

PB94150604

Publication Date	1994
Personal Author	Bhatt, S. K.
Page Count	14
Abstract	Although overall worker productivity for U.S. underground coal mines is available, productivity by mining method and seam thickness is not. Mining technology has gone through dramatic changes in the past decade and the industry has experienced a lack of accurate productivity figures addressing these changes. The information is of great interest in planning for future mining systems as thick and shallow coal seams currently being mined are depleted and exploitation of thinner, deeper, and better quality seams is considered to partially meet the requirements of 1990 Clean Air Act Amendments. In a cooperative program, the U.S. Bureau of Mines obtained raw mine level production and related data from the Energy Information Administration for 1989 and 1990 and performed the needed statistical analysis. Base criteria, parameters, and salient results of the mine productivity analysis are presented in the report.
Keywords	Coal mining Productivity Room and pillar mining Caving mining United States Coal seams
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries
Corporate Authors	Bureau of Mines, Pittsburgh, PA. Pittsburgh Research Center.
Supplemental Notes	Library of Congress catalog card no. 93-21353.
Document Type	Technical Report
Title Note	Information circular/1994.
NTIS Issue Number	199411

Longwall and Room-and-Pillar Productivity: A Review of U.S. Coal Mines.

Longwall and Room-and-Pillar Productivity: A Review of U.S. Coal Mines.
PB94150604

Publication Date	1994
Personal Author	Bhatt, S. K.
Page Count	14
Abstract	Although overall worker productivity for U.S. underground coal mines is available, productivity by mining method and seam thickness is not. Mining technology has gone through dramatic changes in the past decade and the industry has experienced a lack of accurate productivity figures addressing these changes. The information is of great interest in planning for future mining systems as thick and shallow coal seams currently being mined are depleted and exploitation of thinner, deeper, and better quality seams is considered to partially meet the requirements of 1990 Clean Air Act Amendments. In a cooperative program, the U.S. Bureau of Mines obtained raw mine level production and related data from the Energy Information Administration for 1989 and 1990 and performed the needed statistical analysis. Base criteria, parameters, and salient results of the mine productivity analysis are presented in the report.
Keywords	Coal mining Productivity Room and pillar mining Caving mining United States Coal seams
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries
Corporate Authors	Bureau of Mines, Pittsburgh, PA. Pittsburgh Research Center.
Supplemental Notes	Library of Congress catalog card no. 93-21353.
Document Type	Technical Report
Title Note	Information circular/1994.
NTIS Issue Number	199411