                      
                             INTRODUCTION

           This cdrom contain metallic and industrial mineral records of
      mines, prospects, and occurrences in Puerto Rico. The records were
      compiled for the mineral resource assessment of Puerto Rico and the
      U.S. Geological Survey's Minerals Resources Data System (MRDS). Also 
      it contains GSSEARCH software which is used to search and retrieve
      data from this CD-ROM.

           Each record is composed of 228 fields although every field may
      not contain data. Some of topics covered in the record are deposit name,
      location, commodity information, description of deposit, geology of the
      deposit, amount of production, amount of reserves, amount of potential
      resources, and references. For a complete list of the fields that may be
      found in a record, see tech.doc file or a MRDS Application Guide.

           The GSSEARCH software was developed at the U.S. Geological Survey
      as an outgrowth of a system to manage geologic bibliographic information.
      It supports fixed or variable length data and allows for full text
      searching of specific fields that have indexed. It presents selected
      records back to the user for perusal in both browse and detail formats.
      Also the records may be printed or written to a disk file in different
      formats.

           If you have any question regarding this CD-ROM, contact Walt Bawiec.
      (ph#-703-648-6148, fax-703-648-6383, email-wbawiec@rgborafsa.er.usgs.gov).
      



                             RECNO (RECORD NUMBER)

     The Record Number is a seven-character alphanumeric code that is unique
     for each MRDS record. This field is used to uniquely identify the record.

                            REC_TYPE (RECORD TYPE)

       This field is used to indicate the record type or the general area
       covered by the record. The valid types are listed below:

                       Code       Record Type
    
                        S         Site Record
                        D         District Record
                        R         Regional Record
                        T         Tailings Record

                          CTRY_CODE (COUNTRY CODE)

    This field is used to report the country code in which the deposite site
    is located. Below is a list of the country codes and names.

                 CODES AND NAMES FOR COUNTRIES AND OTHER AREAS
               
                     CODE    COUNTRY
                      AF  -  AFGHANISTAN
                      AL  -  ALBANIA
                      AG  -  ALGERIA
                      AQ  -  AMERICAN SAMOA
                      AN  -  ANDORRA
                      AO  -  ANGOLA
                      AV  -  ANGUILLA
                      AY  -  ANTARCTICA
                      AC  -  ANTIGUA AND BARBUDA
                      AR  -  ARGENTINA
                      AM  -  ARMENIA
                      AT  -  ASHMORE AND CARTIER ISLANDS
                      AS  -  AUSTRALIA
                      AU  -  AUSTRIA
                      AZ  -  AZERBAIJAN
                      BF  -  BAHAMAS
                      BA  -  BAHRAIN
                      BG  -  BANGLADESH
                      BB  -  BARBADOS
                      BE  -  BELGIUM
                      BH  -  BELIZE
                      BN  -  BENIN
                      BD  -  BERMUDA
                      BT  -  BHUTAN
                      BL  -  BOLIVIA
                      BC  -  BOTSWANA
                      BV  -  BOUVET ISLAND
                      BR  -  BRAZIL
                      IO  -  BRITISH INDIAN OCEAN TERRITORIES
                      VI  -  BRITISH VIRGIN ISLANDS
                      BX  -  BRUNEI
                      BU  -  BULGARIA
                      BM  -  BURMA
                      BY  -  BURUNDI
                      BS  -  BYELARUS
                      CB  -  CAMBODIA
                      CM  -  CAMEROON
                      CA  -  CANADA
                      CV  -  CAPE VERDE
                      CJ  -  CAYMAN ISLANDS
                      CT  -  CENTRAL AFRICAN REPUBLIC
                      CD  -  CHAD
                      CI  -  CHILE
                      CH  -  CHINA
                      KT  -  CHRISTMAS ISLAND
                      CK  -  COCOS (KEELING) ISLANDS
                      CO  -  COLOMBIA
                      CN  -  COMORO ISLANDS
                      CF  -  CONGO
                      CW  -  COOK ISLANDS
                      CS  -  COSTA RICA
                      CU  -  CUBA
                      CY  -  CYPRUS
                      CZ  -  CZECHOSLOVAKIA
                      DA  -  DENMARK
                      DJ  -  DJIBOUTI
                      DO  -  DOMINICA
                      DR  -  DOMINICAN REPUBLIC
                      EC  -  ECUADOR
                      EG  -  EGYPT
                      ES  -  EL SALVADOR
                      EK  -  EQUATORIAL GUINEA
                      EA  -  ESTONIA
                      ET  -  ETHIOPIA
                      FA  -  FALKLAND ISLANDS
                      FO  -  FAROE ISLANDS
                      FJ  -  FIJI
                      FI  -  FINLAND
                      FR  -  FRANCE
                      FG  -  FRENCH GUIANA
                      FP  -  FRENCH POLYNESIA
                      FS  -  FRENCH SOUTHERN AND ANTARCTIC LANDS
                      GB  -  GABON
                      GA  -  GAMBIA
                      GZ  -  GAZA STRIP
                      GO  -  GEORGIA
                      GE  -  GERMANY
                      GH  -  GHANA
                      GI  -  GIBRALTAR
                      GR  -  GREECE
                      GL  -  GREENLAND
                      GJ  -  GRENADA
                      GP  -  GUADELOUPE
                      GQ  -  GUAM
                      GT  -  GUATEMALA
                      GV  -  GUINEA
                      PU  -  GUINEA-BISSAU
                      GY  -  GUYANA
                      HA  -  HAITI
                      HM  -  HEARD ISLAND AND MCDONALD ISLANDS
                      HO  -  HONDURAS
                      HK  -  HONG KONG
                      HU  -  HUNGARY
                      IC  -  ICELAND
                      IN  -  INDIA
                      ID  -  INDONESIA
                      IR  -  IRAN
                      IZ  -  IRAQ
                      IY  -  IRAQ-SAUDI ARABIA NEUTRAL ZONE
                      EI  -  IRELAND
                      IS  -  ISRAEL
                      IT  -  ITALY
                      IV  -  IVORY COAST
                      JM  -  JAMAICA
                      JN  -  JAN MAYEN
                      JA  -  JAPAN
                      JQ  -  JOHNSTON ATOLL
                      JO  -  JORDAN
                      KZ  -  KAZAKHSTAN
                      KE  -  KENYA
                      KU  -  KUWAIT
                      KY  -  KYRGYZSTAN
                      LA  -  LAOS
                      LV  -  LATVIA
                      LE  -  LEBANON
                      LT  -  LESOTHO
                      LI  -  LIBERIA
                      LI  -  LIBERTADOR
                      LY  -  LIBYA
                      LS  -  LIECHTENSTEIN
                      LH  -  LITHUANIA
                      LU  -  LUXEMBOURG
                      MC  -  MACAU
                      MA  -  MADAGASCAR
                      ME  -  MERINO
                      MI  -  MALAWI
                      MY  -  MALAYSIA
                      MV  -  MALDIVES
                      ML  -  MALI
                      MT  -  MALTA
                      MB  -  MARTINIQUE
                      MR  -  MAURITANIA
                      MP  -  MAURITIUS
                      MX  -  MEXICO
                      MQ  -  MIDWAY ISLANDS
                      MN  -  MONACO
                      MG  -  MONGOLIA
                      MH  -  MONTSERRAT
                      MO  -  MOROCCO
                      MZ  -  MOZAMBIQUE
                      WA  -  NAMIBIA
                      NR  -  NAURU
                      NP  -  NEPAL
                      NL  -  NETHERLANDS
                      NA  -  NETHERLANDS ANTILLES
                      NC  -  NEW CALEDONIA
                      NZ  -  NEW ZEALAND
                      NU  -  NICARAGUA
                      NG  -  NIGER
                      NI  -  NIGERIA
                      NE  -  NIUE
                      NF  -  NORFOLK ISLAND
                      KN  -  NORTH KOREA
                      NO  -  NORWAY
                      MU  -  OMAN
                      PK  -  PAKISTAN
                      PM  -  PANAMA
                      PP  -  PAPUA NEW GUINEA
                      PF  -  PARACEL ISLANDS
                      PA  -  PARAGUAY
                      PE  -  PERU
                      RP  -  PHILIPPINES
                      PC  -  PITCAIRN ISLANDS
                      PL  -  POLAND
                      PO  -  PORTUGAL
                      RQ  -  PUERTO RICO
                      QA  -  QATAR
                      RE  -  REUNION ISLAND
                      RO  -  ROMANIA
                      RU  -  RUSSIA
                      RW  -  RWANDA
                      SM  -  SAN MARINO
                      TP  -  SAO TOME AND PRINCIPE
                      SA  -  SAUDI ARABIA
                      SD  -  SANTO DOMINGO
                      SG  -  SENEGAL
                      SE  -  SEYCHELLES
                      SL  -  SIERRA LEONE
                      SN  -  SINGAPORE
                      BP  -  SOLOMON ISLANDS
                      SO  -  SOMALIA
                      SF  -  SOUTH AFRICA
                      KS  -  SOUTH KOREA
                      SP  -  SPAIN
                      PG  -  SPRATLY ISLANDS
                      CE  -  SRI LANKA (CEYLON)
                      SC  -  ST. CHRISTOPHER AND NEVIS
                      SH  -  ST. HELENA
                      ST  -  ST. LUCIA
                      SB  -  ST. PIERRE AND MIQUELON
                      VC  -  ST. VINCENT AND THE GRENADINES
                      SU  -  SUDAN
                      NS  -  SURINAM
                      SV  -  SVALBARD
                      WZ  -  SWAZILAND
                      SW  -  SWEDEN
                      SZ  -  SWITZERLAND
                      SY  -  SYRIA
                      TW  -  TAIWAN
                      TJ  -  TAJIKISTAN
                      TZ  -  TANZANIA
                      TH  -  THAILAND
                      TO  -  TOGO
                      TL  -  TOKELAU ISLANDS
                      TN  -  TONGA
                      TD  -  TRINIDAD AND TOBAGO
                      TR  -  TRUJILLO
                      NQ  -  TRUST TERRITORY OF PACIFIC ISLANDS
                      TS  -  TUNISIA
                      TU  -  TURKEY
                      TM  -  TURKMENISTAN
                      TK  -  TURKS AND CAICOS ISLANDS
                      UG  -  UGANDA
                      UE  -  UKRAINE
                      TC  -  UNITED ARAB EMIRATES
                      UK  -  UNITED KINGDOM
                      US  -  UNITED STATES
                      UV  -  UPPER VOLTA
                      UY  -  URUGUAY
                      UZ  -  UZBEKISTAN
                      NH  -  VANUATU
                      VT  -  VATICAN CITY
                      VE  -  VENEZUELA
                      VM  -  VIETNAM
                      VQ  -  VIRGIN ISLANDS
                      WQ  -  WAKE ISLAND
                      WF  -  WALLIS AND FUTUNA
                      WI  -  WESTERN SAHARA
                      WS  -  WESTERN SAMOA
                      YS  -  YEMEN (ADEN)
                      YE  -  YEMEN (SANAA)
                      YO  -  YUGOSLAVIA
                      CG  -  ZAIRE
                      ZA  -  ZAMBIA
                      ZI  -  ZIMBABWE


                             SITE (SITE NAME)

This field contain the most recent name/type of the orebody, deposit, mine,
occurrence, prospect, claim or group when the site name is known. If the
site has no name or it's name is unknown, the term UNNAMED or UNIDENTIFIED
may be used. (exp: UNNAMED OR UNNAMED OCCURRENCE).


                               LAT (LATITUDE)

  This field contain the latitude for the record/deposit. It may be in degrees,
  minutes and seconds separated by a dash. (Exp: ((10-00-00X), X=N/S)) or it
  may be in decimal degrees. (Exp: ((10.000 or -10.000), (-)=SOUTH).


                              LONG (LONGITUDE) 

     This field contain the longitude for the record/deposit. It may be in
     degrees, minutes and seconds separated by a dash. (Exp: ((010-00-00X),
     X=E/W)) or it may be in decimal degrees. (Exp: ((10.000 or -10.000),
     (-)=WEST).

                       COMMOD (COMMODITIES PRESENT)

   This field contain all of the known commodities found at this site in
   coded form. They are ordered from most important to least important in
   the following order: Major commodities, Minor commodities, and Trace
   commodities. Most important can mean the following: coproducts; products
   of greatest economic significance; products most deliberately produced;
   the products of primary interest. Below is the list of MRDS valid codes
   and type codes ((M)etallic, (N)on-metallic, (B)oth).

                LIST OF COMMODITY NAMES, CODES, AND TYPE CODES

CODE           NAME                TYPE  CODE           NAME                TYPE
AL     ALUMINUM (GENERAL)            M   AL1    BAUXITE                       M
AL2    ALUMINUM (OTHER)              M   AL3    ALUNITE                       N
ALM    ALUM                          N   AND    ANDALUCITE                    M
AS     ARSENIC                       M   ASB    ASBESTOS                      N
AU     GOLD                          M   B      BORON - BORATES               N
BA     BARIUM - BARITE               N   BE     BERYLLIUM                     M
BI     BISMUTH                       M   BIT    BITUMENS (ASPHALT)            N
BR     BROMINE                       N   BRI    BRINES/SALINES                N
C      CARBON                        N   CA     CALCIUM                       N
CAR    CARBONATES                    N   CD     CADMIUM                       M
CE     CERIUM                        M   CER    CEMENT ROCK (NATURAL)         N
CHL    CHLORITE                      N   CL     CHLORINE                      N
CLY    CLAY (GENERAL)                N   CLY1   BENTONITE                     N
CLY2   FULLER'S EARTH                N   CLY3   KAOLIN                        N
CLY4   BALL CLAY                     N   CLY5   FIRE CLAY (REFRACTORY)        N
CLY6   BLOATING MATERIAL             N   CLY7   COMMON BRICK CLAY             N
CO     COBALT                        M   CO2    CARBON DIOXIDE                N
COA    COAL                          N   COA1   ANTHRACITE                    N
COA2   BITUMINOUS COAL               N   COA3   SUB-BITUMINOUS COAL           N
COA4   LIGNITE                       N   COLL   COLLECTIBLE                   B
COR    CORUNDUM                      N   CR     CHROMIUM                      M
CS     CESIUM                        M   CU     COPPER                        M
DIA    DIAMOND                       N   DIT    DIATOMITE                     N
DOL    DOLOMITE (GENERAL)            N   DOL1   ULTRA PURE DOLOMITE           N
DOL2   HIGH MAGESIAN DOLOMITE        N   DY     DYSPROSIUM                    N
EMY    EMERY                         N   EVA    EVAPORITES                    N
F      FLUORINE - FLUORITE           N   FE     IRON                          M
FLD    FELDSPAR                      N   FLN    FLINT                         N
GA     GALLIUM                       M   GAR    GARNET                        N
GAS    GAS (NATURAL)                 N   GE     GERMANIUM                     M
GEM    GEMSTONES                     N   GEM1   PRECIOUS GEMS                 N
GEM2   SEMI-PRECIOUS GEMS            N   GEO    GEOTHERMAL                    N
GLA    GLAUCONITE                    N   GRF    GRAPHITE                      N
GRT    GRANITE                       N   GYP    GYPSUM, ANHYDRITE             N
HAL    HALITE                        N   HE     HELIUM                        N
HG     MERCURY                       M   I      IODINE                        N
IN     INDIUM                        M   IR     IRIDIUM                       M
K      POTASSIUM                     N   KYN    KYANITE                       N
LA     LANTHANUM                     M   LAT    LATERITE                      M
LI     LITHIUM                       B   LST    LIMESTONE (GENERAL)           N
LST1   ULTRA PURE LIMESTONE          N   LST2   HIGH CALCIUM LIMESTONE        N
LWA    LIGHTWEIGHT AGGREGATE         N   MBL    MARBLE                        N
MG     MAGNESIUM (BRUCIT)            M   MGS    MAGNESITE                     N
MIC    MICA                          N   MIC1   SHEET MICA                    N
MIC2   SCRAP MICA                    N   MIC3   FLAKE MICA                    N
MN     MANGANESE                     M   MO     MOLYBDENUM                    M
MON    MONAZITE                      M   MPG    MINERAL PIGMENTS              N
N      NITROGEN - NITRATES           N   NA     SODIUM                        N
NACO   SOCIUM CARBONATE              N   NASO   SODIUM SULFATE                N
NB     NIOBIUM (COLUMBIUM)           M   ND     NEODYMIUM                     N
NI     NICKEL                        M   OI     OSMIRIDIUM(OSMIUM+IRIDIUM)    M
OIL    PETROLEUM (OIL)               N   OLV    OLIVINE                       N
OS     OSMIUM                        M   P      PHOSPHORUS - PHOSPHATES       N
PB     LEAD                          M   PD     PALLADIUM                     M
PEA    PEAT                          N   PER    PERLITE                       N
PGM    PLATINUM GROUP METALS         M   PT     PLATINUM                      M
PUM    PUMICE                        N   PYF    PYROPHYLLITE                  N
PYR    PYRITE                        N   PYR1   PYRRHOTITE                    N
QTZ    QUARTZ                        N   RA     RADIUM                        M
RAM    RADIO-ACTIVE MATERIALS        M   RB     RUBIDIUM                      M
RE     RHENIUM                       M   REE    RARE EARTHS ELEMENTS          M
REF    REFRACTORY                    N   RH     RHODIUM                       M
RU     RUTHENIUM                     M   S      SULFUR                        N
SAM    SAND, MOLDING                 N   SAO    OIL SANDS                     N
SAP    SAPROLITE                     N   SB     ANTIMONY                      M
SC     SCANDIUM                      M   SDG    SAND AND GRAVEL               N
SE     SELENIUM                      M   SEA    SEA WATER                     N
SHL    SHALE                         N   SHO    OIL SHALE                     N
SIL    SILICA                        N   SLA    SLATE                         N
SLF    SULFURIC ACID                 N   SN     TIN                           M
SO4    SULFATES                      N   SR     STRONTIUM                     N
SST    SANDSTONE                     N   STA    STAUROLITE                    N
STN    STONE                         N   STN1   CRUSHED/BROKEN STONE          N
STN2   DIMENSION STONE               N   STN3   FLAGSTONE                     N
SUL    SULFIDES                      N   TA     TANTALUM                      M
TE     TELLURIUM                     M   TH     THORIUM                       M
TI     TITANIUM                      M   TL     THALLIUM                      M
TLC    TALC - SOAPSTONE              N   TRA    TRAVERTINE                    N
U      URANIUM                       M   V      VANADIUM                      M
VOL    VOLCANIC MATERIALS            N   VRM    VERMICULITE                   N
W      TUNGSTEN                      M   WOL    WOLLASTONITE                  N
YB     YTTERBIUM                     M   YT     YTTRIUM                       M
ZEO    ZEOLITES                      N   ZN     ZINC                          M
ZR     ZIRCONIUM                     B


                           MAJOR (MAJOR COMMODITIES)

     This field contain the commodities that are of primary importance at
     this site. They are ordered in decreasing order of significance in
     relation to having been produced at the site. Secondary importance can
     mean the following: byproduct(s); less abundant product(s); product(s)
     of some economic significance; product(s) least deliberately produced;
     the product(s) of least interest. See the COMMOD (COMMODITY PRESENT)
     help message for the list of MRDS valid commodity codes.

                           PROD (PRODUCTION SIZE)

      This field is used to indicate the relative amount of production for
      this site. Below is a list of the valid MRDS production size codes.

                          CODE         SIZE
                           N   -   NO PRODUCTION
                           U   -   UNKNOWN
                           Y   -   PRODUCTION SIZE UNKNOWN
                           S   -   PRODUCTION SIZE SMALL
                           M   -   PRODUCTION SIZE MEDIUM
                           L   -   PRODUCTION SIZE LARGE


                         STATUS (DEVELOPMENT STATUS)

   This field contain information about the status of the deposit in terms
   of the development activity occurring at the site. It is broken into
   eight categories. The characteristics of each category are described in
   terms of the amount of exploration and development work done at the site.
   Below is a list of the MRDS site development codes, categories, and status.

        CODE               CATEGORIES                STATUS
         1              OCCURRENCE                  INACTIVE
         2              PROSPECT                    INACTIVE
         3              PROSPECT                    ACTIVE
         4              LITTLE DEVELOPED PRODUCER   INACTIVE
         5              LITTLE DEVELOPED PRODUCER   ACTIVE
         6              DEVELOPED PRODUCER          INACTIVE
         7              DEVELOPED PRODUCER          ACTIVE
         8              INTERMITTENT PRODUCER       ACTIVE or INACTIVE

