TABLE 4 Production and Waste Allocation for U.S. Industrial Mineral Production from Domestic and Foreign Ores, 1988(1,000 metric tons)

Mineral

Total Material Handled (A)

Ore Treated or Sold (B)

Domestic Production (C)

Exports (D)

Imports (E)

Apparent Consumption (C - D + E)

Overburden

Loss (A - B)

Concentration Losses (B - C)

Abrasives, natural

232

156

156

156

76

0

Barite

404

404

404

0.205

1,207

1,611

0

0

Clays

83,370

44,633

44,515

3,535

33

41,013

38,737

118

Diatomite

3,420

695

629

147

0

482

2,725

66

Feldspar

649

649

649

12

287

924

0

0

Gypsum

18,325

14,869

14,869

246

8,782

23,405

3,456

0

Mica

130

130

130

6

12

136

0

0

Perlite

586

586

585

0

0

585

0

1

Phosphorus

451,778

224,075

45,389

0

0

45,389

227,703

178,686

Potassium salts

12,247

11,884

2,999

579

6,964

9,384

363

8,885

Pumice

423

374

353

1

28

380

49

21

Salt

34,470

34,470

34,470

802

4,966

38,634

0

0

Sand and gravel

863,640

863,640

863,531

1,837

357

862,051

0

109

Soda ash

15,728

15,728

8,738

2,238

257

6,757

0

6,990

Stone (estimate)

1,151,000

1,150,000

1,148,533

3,304

3,300

1,148,529

1,000

1,467

Talc, soapstone, pyrophilite

1,179

1,234

1,234

382

80

932

-54

0

Vermiculite

3,393

1,769

275

18

32

289

1,624

1,495

TOTAL

2,640,974

2,365,295

2,167,459

13,108

26,305

2,180,656

275,679

197,836

SOURCE: Bureau of Mines (1988, 1989).



The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement