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Open-File Report 98-038

Prepared in cooperation with the Puerto Rico Department of Natural Resources
University of Puerto Rico at Mayagüez

Geology, Geochemistry, Geophysics, Mineral Occurrences and Mineral Resource Assessment for the Commonwealth of Puerto Rico

By U.S. Geological Survey Minerals Team
Walter J. Bawiec, Editor

Thumbnail of the title page showing  1920 Map of Natural Resources of Puerto Rico published by the Puerto Rico Department of Agriculture and Labor


The Commonwealth of Puerto Rico has been investigated over a very long period of time by earth scientists from many disciplines and with diverse objectives in the studies. This publication attempts to apply much of the geologic, geochemical, geophysical, and mineral occurrence information to a single objective focused on producing a mineral resource assessment for the Commonwealth of Puerto Rico. However, the value of this publication lies not within the results of the mineral resource assessment nor within the interactive PDF files which can be viewed on the screen, but within the geologic, geochemical, geophysical, and mineral occurrence digital map coverages and databases which can be used for their own unique applications.

The mineral resource assessment of Puerto Rico represents compilation of several decades of mineral investigations and studies. These investigations have been the joint efforts of the U.S. Geological Survey, the Puerto Rico Department of Natural Resources, and the University of Puerto Rico. This report contains not only the mineral-resource assessment, but also much of the scientific evidence upon which the assessment was based.

Directory Organization

Contains the descriptive text, with the subdirectory tables. The main report file is manuscript.pdf.
USGS Open-File Report 92-353 text is contained in this folder as a PDF file and geochemical sample analysis as dbase format. These include sample analysis for the main island of Puerto Rico, and Culebra and Vieques.
Contains complete Puerto Rico MRDS mineral occurrence data and GSSTK retrieval software. See Appendix E Read Me for installation instructions.
Contains Encapsulated PostScript plot files for those users who can use them. They are in an ASCII file format. These EPS files are provided to allow the user to produce their own plots or PDF files. File root names ending in 'hp' use color sets preferred by HP plotters.
Tagged Image File Format. These files, which are mostly geophysical maps, were scanned in order to provide a raster image to users.
Contains all map coverages provided in ARC/INFO export format. (ARC/INFO 7.1.1)
Contains metadata files for the included geospatial data.
Contains GRA graphic plot files for map coverages and legends. These files are used to produce plots on Versatec electrostatic plotters.
Copies of all aml's used to produce map coverages. Many of the map coverages are compilations and overlays of individual thematic layers, also provided. This information can be quite useful in understanding the thematic layers used and in recreating the plot file on the user's own system.

Posted online October 19, 2009
CD originally published in 1998

For additional information contact:

Eastern Mineral Resources

This report is online only.

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

Bawiec, W.J., ed., 1999, Geology, geochemistry, geophysics, mineral occurrences and mineral resource assessment for the Commonwealth of Puerto Rico: U.S. Geological Survey Open-File Report 98-038, available online only.


Introduction, by Sherman P. Marsh


History of Previous Activities of the U.S. Geological Survey in Puerto Rico, by Robert E. Learned

Geology of Puerto Rico, by Richard D. Krushensky and Johannes H. Schellekens

Geologic Map of Puerto Rico with Correlation Chart and Map Unit Descriptions, by Richard D. Krushensky

Associated Thematic Data for the Geologic Map of Puerto Rico, by Walter J. Bawiec

Geologic Terranes of Puerto Rico, by Walter J. Bawiec

Stream-Sediment Geochemistry of Puerto Rico, Isla de Vieques, and Isla de Culebra, by Sherman P. Marsh

Geophysical Maps of Puerto Rico, by Andrew Griscom and Nami E. Kitchen

Metallic and Industrial Mineral Mines, Prospects, and Occurrences in Puerto Rico, by W.J. Bawiec, D.P. Cox, G.E. McKelvey, M.E. Paidakovich, A. Handler, and J.H. Schellekens

Mineral Resource Assessment of Puerto Rico, by W.J Bawiec, D.P. Cox, A.Griscom, R. Alonzo, B.R. Lipin, S.P. Marsh, G.E. McKelvey, N.J Page, and J.H. Schellekens

Mineral Deposit Summary Sheets, by W.J. Bawiec, D.C. Cox, G.E. McKelvey, A. Griscom, and S.P. Marsh

Quantitative Mineral Resource Assessment of Puerto Rico, by W.J. Bawiec

Topical Studies

Gold Deposits of Puerto Rico, by G.E. McKelvey

Distribution of Platinum-Group Elements in Nickel-Bearing Laterites in Puerto Rico, by B.R. Lipin, J.H. Schellekens, and A.L. Meier

Offshore Sediments and Sand and Gravel Resources of the Insular Shelf of Puerto Rico, by K.M. Scanlon, J.L. Trias, R.W. Rodriguez, and C.M. Delorey

Silt Heavy-Mineral Distributions in the Rio Cibuco system and Adjacent Rivers of North-central Puerto Rico, by L.J. Poppe, J.A. Commeau, and G. Luepke

Side-Looking Airborne Radar Mosaic of Puerto Rico, by K.M. Scanlon

Lignite and Peat in Northwestern Puerto Rico, by Jean N. Weaver

Bibliography of Puerto Rico, by G.E McKelvey

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