| Orris, G. J., Carbonaro, Marguerite, with contributions by Allen, M. S., Bliss, J.D., Ruiz, A.H., Kibbe, Richard, Paidakovich, M.E., Page, N.J., Pierce, H.A., Staude, J.G. (1992) Puerto Rico; industrial mineral mines, prospects, and occurrences in the Mineral Resources Data System (MRDS) Open-File Report Vol. 1992 (92-244) US Geological Survey doi:10.3133/ofr92244 | Report (issue) | Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product...aggregate and road metal, gypsum, barite, and phosphate. Other commodities such as barite, clay, and dolomite...will give a name for a mine, prospect, claim, occurrence, group or placer. In some cases, this may be...geographic feature. If not named, tjhe site may be "unnamed." or "unidentified" if likely named but the reporter...activity. The codes are as follows: 1- mineral occurrence; 2- inactive prospect; 3- active prospect; 4- |
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