Productive Capacity of Coal Mines by Mine Type (Thousand Short Tons)


  2007 2006 2005 2004 2003 2002 2001 2000
Total 31,083 32,500 39,631 43,103 38,007 38,993 39,927 39,013
Underground 19,827 20,716 23,661 27,864 25,690 26,475 26,448 26,908
Continuous - W 17,596 W 17,650 W 18.627 19,054
Conventional - - 467 W W - - -
Longwall - W W W W W W 6,660
Surface 11,256 15,970 15,970 15,239 12,317 12,518 13,479 12,104


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Note:
  •  W = Withheld to avoid disclosure of individual company data.
  • Productivity (short tons per miner hour) is calculated by dividing the total coal production by the total direct labor hours worked by all mine employees engaged in production, preparation, processing, development, maintenance, repair, and shop or yard work at mining operations. Calculation excludes mines producing less than 10,000 short tons and preparation plants with less than 5,000 employee hours, which are not required to provide this data.
  • Totals may not equal sum of components due to independent rounding.


  • Source:
  • Table 11, Annual Coal Report, EIA.