695The Mineral Industry of 
Puerto Rico, 
The Panama Canal Zone, 
The Virgin Islands, 
Pacific Island Possessions, and 
Trust Territory of the Pacific Islands 
The Puerto Rico section of this chapter has been prepared under a cooperative
agreement between the Bureau of Mines, U.S. Department of the Interior, and
the Minereralogy and Geology Section, Industrial Research, Economic Development
Administration, Commonwealth of Puerto Rieo, for collecting information on
all minerals. 
 
By Harry F. Robertson,1 Jose F. Cadilla,2 and Roy Y. Ashizawa3 
 
 
PUERTO R!C04 
 
Mineral production value in Puerto Rico Supervisory mining engineer, Bureau
of Mines. Bartlesville, Okla. 
reached a record high of $63 million. In- 2 Director, Program of Geology
and Mineral creased construction activity was directly Reso~urces, Administration
De Fomento Economico, Commonwealth of Puerto Rico. 
 responsible because cement, sand ana , specialist, Bureau of Mines, San

gravel and stone accounted for most of Francisco, Calif. - 
   ~ Prepared by Harry F. Robertson and Jose 
 the value. F. Cadilla. 
 
 
 
Table 1.—Mineral production in Puerto Rico 1 
Mineral 
Quantity 
1966 
 
 
 
Value 
 
 
 
 (thousands) 
 
— 
1967 
 
 
 
 
 
Quantity 
 Value (thousands) 
 
Cement thousand 376-pound barrels 
Clays thousand short tons - 
Lime do~.. 
Salt do~.. 
7,603 
 350 
 30 
 11 
 
$24,277 
 271 
 960 
 183 
8,447 
 291 
 35 
 12 
 
$27,397 
 244 
 1,106 
 195 
Sandandgravel do......Stone do...... 
9,879 
5,732 
 
14,554 
10,541 
14,101 
7,269 
 
21,633 
12,795 
Total                              Total 1957—59 constant dollars 
           
XX 
XX 
 
50,786 
49,207 
XX 
XX 
 
63,370 
61,815 
XX Not applicable. 
 1 Production as measured by mine shipments, sales, or marketable production
(including consumption by producers).