Summary of Coal Production and Employment
| 2005 | 2004 | 2003 | 2002 | 2001 | 2000 | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 | 1992 | 1991 | 1990 | 1989 | 1988 | 1987 | 1986 | 1985 | 1984 | 1983 | |
| Production | |||||||||||||||||||||||
| Production Total (thousand short tons) | 27,964 | 31,560 | 31,691 | 30,126 | 32,989 | 33,131 | 32,577 | 33,819 | 36,511 | 35,800 | 34,601 | 37,133 | 39,035 | 42,211 | 41,691 | 45,977 | 43,249 | 45,844 | 43,866 | 40,949 | 39,932 | 39,588 | 33,914 |
| Surface | 11,578 | 10,988 | 10,546 | 9,635 | 10,486 | 9,951 | 10,015 | 8,543 | 9,207 | 9,728 | 8,934 | 8,909 | 9,192 | 8,187 | 8,017 | 7,749 | 6,950 | 7,849 | 7,451 | 7,152 | 7,041 | 7,614 | 7,175 |
| Underground | 16,386 | 20,346 | 21,145 | 20,491 | 22,503 | 23,181 | 22,562 | 25,275 | 27,303 | 26,072 | 25,667 | 28,225 | 29,844 | 34,024 | 33,674 | 38,228 | 36,299 | 37,996 | 36,414 | 33,797 | 32,891 | 31,973 | 26,739 |
| Number of Mines | 265 | 260 | 264 | 280 | 282 | 311 | 324 | 327 | 332 | 339 | 338 | 371 | 453 | 425 | 475 | 515 | 699 | 769 | 838 | 934 | 889 | 891 | 880 |
| Surface | 99 | 91 | 84 | 92 | 87 | 106 | 112 | 101 | 95 | 101 | 80 | 96 | 167 | 109 | 125 | 139 | 275 | 302 | 318 | 362 | 266 | 285 | 261 |
| Underground | 122 | 124 | 134 | 145 | 154 | 158 | 163 | 172 | 185 | 186 | 201 | 214 | 225 | 247 | 274 | 298 | 341 | 382 | 433 | 485 | 529 | 521 | 535 |
| Employment | |||||||||||||||||||||||
| Average Number of Miners | 5,339 | 5,045 | 4,892 | 5,248 | 5,629 | 5,614 | 5,880 | 6,347 | 7,169 | 7,004 | 7,694 | 8,990 | 9,353 | 10,391 | 10,967 | 11,608 | 11,443 | 12,740 | 13,381 | 14,117 | 14,693 | 15,386 | 14,237 |
| Coal Processing Mill | 623 | 707 | 613 | 628 | 591 | 601 | 625 | 787 | 861 | 863 | 934 | 1,058 | 1,139 | 1,283 | 1,389 | 1,536 | 1,538 | 1,572 | 1,548 | 1,644 | 1,698 | 1,678 | 1,620 |
| Surface | 1,599 | 1,301 | 1,355 | 1,317 | 1,391 | 1,383 | 1,417 | 1,249 | 1,397 | 1,341 | 1,481 | 1,667 | 1,662 | 1,705 | 1,819 | 1,673 | 1,552 | 1,713 | 2,225 | 2,048 | 2,127 | 2,272 | 2,285 |
| Underground | 3,117 | 2,781 | 2,923 | 3,303 | 3,646 | 3,630 | 3,839 | 4,312 | 4,911 | 4,800 | 5,279 | 6,265 | 6,553 | 7,403 | 7,759 | 8,399 | 8,353 | 9,455 | 9,609 | 10,424 | 10,868 | 11,436 | 10,332 |
| Productivity (short tons per miner hour) | 2.49 | 2.89 | 3.11 | 2.89 | 2.86 | 3.05 | 2.99 | 2.72 | 2.66 | 2.59 | 2.36 | 2.33 | 2.23 | 2.18 | 2.07 | 2.08 | 2.01 | 1.99 | 1.87 | 1.67 | 1.61 | 1.51 | 1.44 |
| Surface | 3.15 | 3.66 | 3.53 | 3.39 | 3.67 | 3.78 | 3.63 | 3.41 | 3.48 | 3.47 | 3.31 | 3.08 | 2.99 | 2.77 | 2.51 | 2.53 | 2.45 | 2.41 | 2.12 | 2.06 | 2.00 | 1.92 | 1.84 |
| Underground | 2.68 | 3.53 | 3.61 | 3.29 | 3.05 | 3.34 | 3.28 | 3.04 | 2.92 | 2.83 | 2.53 | 2.59 | 2.45 | 2.45 | 2.35 | 2.40 | 2.34 | 2.30 | 2.18 | 1.91 | 1.83 | 1.70 | 1.63 |