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Table 03. Average Number of Employees at Coal Mines in the United States, by Primary Activity, 1978-2006

 

 

Year

Underground Mines

Surface Mines

 

Underground

Surf at UG

Total

Strip

Auger

Culm Bank

Dredge

Total

1978

128,076

15,917

143,993

74,227

1,059

361

21

75,668

1979

132,928

15,997

148,925

73,244

636

362

44

74,286

1980

127,169

15,480

142,649

70,776

584

360

70

71,790

1981

121,702

15,603

137,305

72,062

793

342

120

73,317

1982

118,760

14,115

132,875

69,972

597

409

111

71,089

1983

89,803

11,681

101,484

63,306

592

363

114

64,375

1984

93,554

11,823

105,377

67,622

563

368

120

68,673

1985

89,073

11,959

101,012

62,516

628

382

126

63,652

1986

82,643

11,513

94,156

59,404

611

479

109

60,603

1987

 75,297

10,502

85,799

56,886

884

516

169

58,455

1988

71,775

10,194

81,969

54,753

910

486

186

56,335

1989

69,589

10,612

80,201

53,518

900

532

187

55,137

1990

70,955

11,486

82,441

54,940

874

607

147

56,568

1991

64,591

11,784

76,375

5l,752

872

648

118

53,390

1992

60,378

11,616

71,994

50,487

957

671

109

52,224

1993

52,427

11,699

64,126

48,365

767

1,196

83

50,411

1994

53,936

11,423

65,359

48,771

884

797

112

50,564

1995

49,437

10,385

59,822

44,918

867

759

93

46,637

1996

46,819

10,086

56,905

43,550

1,027

809

245

45,631

1997

45,755

10,114

55,869

44,152

1,179

896

147

46,374

1998

44,240

9,044

53,284

43,457

1,102

753

293

45,605

1999

40,248

8,813

49,061

41,532</