1Statistical Summary 
 
By Kathleen J. D'Ainico' 
 
 
 This summary appears in Minerals Yearbook volumes I-IT, and III, which cover
mineral production in the United States, its island possessions, the Canal
Zone, and the Commonwealth of Puerto Rico, as well as the principal minerals
imported into and exported from the United States. The sections of this chapter
and the area chapters in volume III contain further details on production.
A summary table comparing world and U.S. mineral production also is included.

 Mineral production may be measured at any of several stages of extraction
and processing. The stage of measurement used in the chapter is normally
what is termed "mine output." It usually refers to minerals in the form in
which they are first extracted from the ground, but customarily includes
for some minerals the product of auxiliary processing operations at or near
mines. 
 Because of inadequacies in the statistics available, some series deviate
from the foregoing definition. The quantities of gold, silver, copper, lead,
zinc, and tin are recorded on a mine basis (as the recoverable content of
ore sold or treated). The values assigned to these quantities, however, are
based on the average selling price of refined metal, not the mine value.
Mercury is measured as recovered metal and valued at the average New York
price for metal. 
 The weight or volume units shown are those customary in the particular industries
producing the respective commodities. No adjustment has been made in dollar
values for changes in purchasing power of the dollar. 
 
1 Statistical officer, Minerals Yearbook. 
 
Table l.—Value of mineral production 1 in the United States by mineral
groups 
(Millions) 
Year 
Mineral fuels 
Nonmetals 
(except fuels) 
Metals 
Total 
1963                        
1964                        
1965                        
1966'                       
1967                        
$13,317 
13,623 
14,047 
15,112 
16,198 
$4,316 
4,623 
4,933 
5,176 
5,205 
$2,002 
r2,366 
2,544 
2,703 
2,333 
$1963 r20,612 
' 21,524 22,991 
23,756 
 Revised. 
 ' Production as measured by mine shipments, sales, or marketable production
(including consumption by producers.