696 
MINERALS YEARBOOK, 1967 
 
 
Table 2.—Value of mineral production in Puerto Rico, by districts 
Senatorial district 
1966 
1967 
Minerals produced in 1967, in order of value 
Aguadilla                 
Arecibo                  
Guayama                 
Hurnacao                 
$1,481,400 
1,303,750 
2,725,250 
999,300 
$1,583,050 
1,424,000 
4,697,900 
993,400 
Stone,sandandgravel. 
Do. 
Sandandgravel,stone. 
Stone, sand and gravel. 
Mayaguez                
Ponce                   
San Juan                 
3,059,522 
17,345,659 
23,871,119 
4,112,511 
22,107,874 
28,451,265 
Sandandgravel,stone,salt. 
Cement, sand and gravel, stone, lime, clay. 
Cement, sand and gravel, stone, clay. 
Total               
50,786,000 
63,370,000 
 
 
 The Puerto Rico Water Resources Authority was considering the Yabucoa area
on the southeast corner of the Island as the site for a 500,000-kilowatt-per-day
nuclear powerplant. Electric power requirements were increasing most rapidly
in that area with the growth of industry. A seawater desalting plant may
be included in the project. 
 Negotiations relating to the proposed copper mining in the Utuado-LaresAdjuntas
area continued. The Puerto Rico Economic Development Administration (PREDA)
considered different versions of a suitable contract to mine the copper resource
with minimal air, land, and water pollution. 
 The Geologic Division of the U.S. Geological Survey, working under a cooperative
agreement with PREDA, mapped 7½minute quadrangles at various locations
on the Island as part of the program of preparing geologic maps and advising
the Puerto Rican Government on geologic problems. Reports were published
on the geology of the Quebradillas, Corozal, and Utuado quadrangles5 and
the stratigraphy of west-central Puerto Rico.° 
 The Water Resources Division of the U.S. Geological Survey, in cooperation
with the Commonwealth of Puerto Rico, conducted water resource investigations
in various areas of the Island. A map delineating the boundaries of record
floods at Humacao was published.7 
 A study of minerals on the ocean floor 
around Puerto Rico was planned as a joint project by the Federal Geological
Survey and the Commonwealth Government. The study will begin by sampling
the ocean floor in Mona Passage south and west of the Island. 
 The Soils and Geology Division of the Puerto Rican Department of Public
Works continued work on reports. of construction material resources in the
Rio Grande, Barceloneta, and Arecibo quadrangles. Responsibility for continuing
the series of reports was assigned to the Highway Authority. 
 
REVIEW BY MINERAL COMMODITIES 
 
 Nonxnetals.—Cement.-----Increased shipments of portland cement followed
the upward trend of the construction industry. Domestic production gained
while imported cement—principally from Colombia, Belgium, and Japan—decreased
to 555,000 barrels. 
 
 ~ Monroe, W. H. Geologic map of the Quebradillas Quadrangle, Puerto Rico.
Miscellaneous Geological Investigations Map No. 1-498. U.S. Geol. Survey,
1967. Nelson, Arthur E. Geologic map of the Corozal Quadrangle, Puerto Rico.
Miscellaneous Geological Investigations Map No. 1-473. U. S. GeoL Survey,
1967. Nelson. Arthur E. Geologic map of the Utuado Quadrangle, Puerto Rico.
Miscellaneous Geological Investigations Map No. 1.480, U.s. Geol. Survey,
1967. 
 6 Mattson, P. H. Cretaceous and lower Tertiary stratigraphy in west-central
Puerto Rico. U.S. Geol. Survey Bull. 1254-B, 1967, 35 pp. 
 Lopez, M. A. Floods at Humacao, Puerto Rico. Hydrologic Investigations Atlas
No. HA245. U.S. Geol. Survey, 1967.