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National Institute for Occupational Safety and Health National Institute for Occupational Safety and Health
National Institute for Occupational Safety and Health

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  • Zeta potential control for simultaneous enhancement of penetration rates and bit life in rock drilling
    Filetype[PDF - 10.27 MB]
    Personal Author:
    Engelmann, William H.
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1987
    Series:
    Report of investigations (United States. Bureau of Mines) ; 9103
    Description:
    "In pursuit of innovative methods to improve mining productivity, the Bureau of Mines is investigating the use of inorganic salts as drilling fluid ad...
    File Type:
    Filetype[PDF - 10.27 MB]
    File Type:
    Filetype[PDF - 10.27 MB]
  • Cost comparison of gob hole and cross-measure borehole systems to control methane in gobs
    Filetype[PDF - 1.47 MB]
    Personal Author:
    Baker, E. C. (Eugene C.) ; Garcia, F. (Fred) ; ...
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1988
    Series:
    Report of investigations (United States. Bureau of Mines) ; 9151
    Description:
    "The capital investment and operating costs of two methane-control systems used during longwall mining operations are compared in this Bureau of Mines...
    File Type:
    Filetype[PDF - 1.47 MB]
    File Type:
    Filetype[PDF - 1.47 MB]
  • Bit wear-flat temperature as a function of depth of cut and speed
    Filetype[PDF - 6.87 MB]
    Personal Author:
    Wingquist, Carl F. ; Hanson, Bruce D. ;
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1987
    Series:
    Report of investigations (United States. Bureau of Mines) ; 9112
    Description:
    "As part of an ongoing study to determine how the wear of mining tools affects dust generation, the Bureau of Mines has measured bit temperature rise ...
    File Type:
    Filetype[PDF - 6.87 MB]
    File Type:
    Filetype[PDF - 6.87 MB]
  • Use of vertical boreholes for assisting ventilation of longwall gob areas
    Filetype[PDF - 796.51 KB]
    Personal Author:
    Elder, Curtis H.
    Corporate Authors:
    United States. Bureau of Mines. ; United States. Bureau of Mines. Methane Control Program. ;
    Published Date:
    May 1969
    Series:
    Bureau of Mines technical progress report ; TPR 13
    Description:
    An experimental degasification program using a vertical borehole and vacuum pump to drain gas from the gob area of a longwall panel was successful at ...
    File Type:
    Filetype[PDF - 796.51 KB]
    File Type:
    Filetype[PDF - 796.51 KB]
  • Probability of encountering coalbed discontinuities during vertical and horizontal borehole drilling
    Filetype[PDF - 1.13 MB]
    Personal Author:
    Houseknecht, David W.
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1982
    Series:
    Report of investigations (United States. Bureau of Mines) ; 8665
    Description:
    "Probabilities of encountering coalbed discontinuities during vertical or horizontal drilling in a specific coalbed can be estimated based on analysis...
    File Type:
    Filetype[PDF - 1.13 MB]
    File Type:
    Filetype[PDF - 1.13 MB]
  • Site-specific and regional geologic considerations for coalbed gas drainage
    Filetype[PDF - 1.55 MB]
    Personal Author:
    Diamond, W. P. (William P.)
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1982
    Series:
    Information circular (United States. Bureau of Mines) ; 8898
    Description:
    "The Bureau of Mines has been involved in the drilling of vertical, horizontal, and directional coalbed gas drainage boreholes for mine safety since 1...
    File Type:
    Filetype[PDF - 1.55 MB]
    File Type:
    Filetype[PDF - 1.55 MB]
  • Review of horizontal drilling technology for methane drainage from U.S. coalbeds
    Filetype[PDF - 3.02 MB]
    Personal Author:
    Finfinger, Gerald L. ; Cervik, Joseph ;
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1980
    Series:
    Information circular (United States. Bureau of Mines) ; 8829
    File Type:
    Filetype[PDF - 3.02 MB]
    File Type:
    Filetype[PDF - 3.02 MB]