El Refugiorio Colorado

STAFF, MINING INTERNATIONAL YEARBOOK 1978: FINANCIAL TIMES,LONDON, 1978, 310 P.STAFF, 1978 ENGINEERING AND MINING JOURNAL INTERNATIONALDIRECTORY OF MINING AND MINERAL PROCESSING OPERATIONS: NEWYORK, MCGRAW-HILL, 1978, 314 P.MINING ANNUAL REVIEW, MEXICO: LONDON, MINING JOURNAL, 1977,343 P.FLUORSPAR-THE WORLD'S LEADING PRODUCER, INDUSTRIAL MINERALS,JUNE, 1980.INDUSTRIAS PENOLES,S.A. DE C.V.,ANNUAL REPORT, 1981.FLUORSPAR-FALLING PRICES AS CAPACITY LEADS DEMAND,INDUSTRIAL MINERALS, JUNE 1982.GEOLOGY AND GEOCHEMISTRY OF THE LAS CUEVAS FLUORITE DEPOSITSAN LUIS POTOSI, MEXICO, ECONOMIC GEOLOGY, VOL.75,1980.MINE/DEPOSIT DATA SHEETSPERSONAL CORRESPONDENCE FROM MR. GILL MONTGOMERY TO MR.WAISSAR.