28 
MINERALS YEARBOOK, 1985 
 
Table 5.—Crude ore and total material handled at surface and underground
mines 
in the United States in 1984, by commodity 
(Percent) 
Commodity 
METALS 
W Withheld to avoid disclosing company proprietary data; included with "Surface"
or "Underground." ' Includes underground; the Bureau of Mines is
not at liberty
to publish separately. 
2lncludes surface; the Bureau of Mines is not at liberty to publish separately.

' Includes unpublished data. 
4Abrasive stone, emery, garnet, and tripoli. 
 
 
 
 
 
 Crude ore Total material 
  Under 
 Surface ground Surface Under 
    ground 
 
Antimony                                       
Bauxite                                         
Copper                                         
100.0 
88.5 
100.0 
 
11.5 
100.0 
95.6 
100.0 
—— 
 
 4.4 
Gold: 
Lode                                         
 Placer                                       Ironore                   
                     
 92.7 
 997 
1100.0 
7.3 
.3 
W 
97.8 
97.7 
11000 
2.2 
 
2.3 W 
Lead                                           
W 
2100.0 
W 
2100.0 
Manganiferous ore  
Molybdenum                                     
Nickel                                          
100.0 
' 100.0 
100.0 
W 
~ 
100.0 
' 100.0 
100.0 
W 
Silver -  
39.0 
61.0 
78.1 
21.9 
Tungsten                                       Uranium                  
                     
 .6 
64.6 
99.4 
35.4 
1.5 
95.3 
98.5 
4.7 
Zinc                                          Average3                  
                
 
100.0 
 
100.0 
 
88.1 
11.9 
93.9 
6.1 
INDUSTRIAL MINERALS 
Abrasives4                                       
1100.0 
W 
1100.0 
W 
Asbestos                                       Barite                   
                      
100.0 
100.0 
 
100.0 
100.0 
 
Clays                                          Diatotnite               
                       
99.3 
100.0 
.7 
99.6 
100.0 
.4 
~ 
Feldspar                                        
Fluorspar                                       
Gypsum                                         
Mica(scrap)                                      
Millstones                                       
100.0 
 W 
84.6 
100.0 
100.0 
2100.0 
 
 15.4 
 ~ 
 ~ 
100.0 
 W 
84.6 
100.0 
100.0 
—— 2100.0 
 15.4 
 
—— 
Olivine                                         
100.0 
 
100.0 
 
Perlite                                          
1100.0 
W 
1100.0 
W 
Phosphaterock                                   Potassium salts         
                          
1100.0 
 
 ~ 
 W 
100.0 
1100.0 
 W 
100.0 
Pumice                                         
100.0 
 
100.0 
 
Salt —                       
6.4 
93.6 
6.2 
93.8 
Sandandgravel                                  Sodiunicarbonate(natural)
                          
100.0 
100.0 
100.0 
 ~ 
100.0 
Talc, soapstone, pyrophyllite                         Vermiculite       
                              
 
Average3                                   
 
Average, metals and industrial minerals'            
90.0 
100.0 
10.0 
~ 
98.3 
100.0 
1.7 
 
96.3 
3.7 
97.0 
3.0 
 
93.9 
6.1 
95.7 
4.3