Underground Mines                                                        Surface Mines

Year

Underground

Surf at UG

Total

Strip

Dredge

Other

Total

1978

3,736,533

910,730

4,647,263

65,622,643

851,478

-

66,474,121

1979

3,871,446

963,214

4,834,660

69,494,907

997,678

-

70,492,585

1980

3,553,234

836,941

4,390,175

65,778,342

873,708

-

66,652,050

1981

3,149,931

822,918

3,972,849

56,692,442

812,182

-

57,504,624

1982

2,730,503

811,226

3,541,729

26,468,945

269,333

-

26,738,278

1983  ^1/

2,578,560

728,117

3,306,677

52,143,546

320,188

-

52,463,734

1984

2,862,197

774,821

3,637,018

56,537,983

416,187

-

56,954,170

1985

2,799,062

821,363

3,620,425

58,747,865

580,276

-

59,328,141

1986

2,916,982

726,095

3,643,077

61,245,897

527,495

-

61,773,392

1987

2,885,904

743,435

3,629,339

61,462,075

511,203

-

61,973,278

1988

3,007,123

824,878

3,832,001

60,942,035

384,136

-

61,326,171

1989

3,029,414

830,957

3,860,371

57,909,215

372,017

-

58,281,232

1990

3,123,546

909,863

4,033,409

56,628,199

358,714

-

56,986,913

1991

2,929,923

870,739

3,800,662

51,754,519

211,493

-

51,966,002

1992

3,024,659

904,791

3,929,450

52,625,149

148,559

-

52,773,708

1993

3,092,881

882,066

3,974,947

54,557,746

174,051

-

54,731,797

1994

3,391,409

717,977

4,109,386

57,567,156

195,881

-

57,763,037

1995

3,423,888

624,586

4,048,474

57,718,063

162,031

-

57,880,094

1996

3,438,121

603,153

4,041,274

56,448,940

209,394

-

56,658,334

1997

3,619,880

612,289

4,232,169

57,721,111

157,415

-

57,878,526

1998

3,852,906

634,385

4,487,291

60,585,553

77,462

-

60,663,015

1999

3,905,514

704,183

4,609,697

62,779,296

57,034

-

62,836,330

2000

3,957,707

786,822

4,744,529

63,018,404

65,367

1,844

63,085,615

2001

3,850,874

829,542

4,680,416

62,715,700

78,232

-

62,793,932

2002

3,750,888

901,869

4,652,757