Identification_Information: Citation: Citation_Information: Originator: US Geological Survey Publication_Date: 2005 Title: porCU Series Information: Series Name: Open-File Report Issue Identification: OFR-2005-xxx Publication Information: Publication Place: 2005 Publisher: US Geological Survey Description: Abstract: Mineral deposit models are important in exploration planning and quantitative resource assessments for two reasons: (1) grades and tonnages among deposit types are significantly different, and (2) many types occur in different geologic settings that can be identified from geologic maps. Mineral deposit models are the keystone in combining the diverse geoscience information on geology, mineral occurrences, geophysics, and geochemistry used in resource assessments and mineral exploration. Too few thoroughly explored mineral deposits are available in most local areas for reliable identification of the important geoscience variables or for robust estimation of undiscovered deposits-thus we need mineral-deposit models. Globally based deposit models allow recognition of important features because the global models demonstrate how common different features are. Well-designed and -constructed deposit models allow geologists to know from observed geologic environments the possible mineral deposit types that might exist, and allow economists to determine the possible economic viability of these resources in the region. Thus, mineral deposit models play the central role in transforming geoscience information to a form useful to policy makers. The foundation of mineral deposit models is information about known deposits. Purpose: The purpose of this publication is to make this kind of information available in digital form for porphyry copper deposits. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2004 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: Irregular Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -180 East_Bounding_Coordinate: 180 North_Bounding_Coordinate: 90 South_Bounding_Coordinate: -90 Keywords: Theme: Theme_Keyword_Thesaurus: AGI Glossary Theme_Keyword: Porphyry Copper Theme_Keyword: Copper Theme_Keyword: Molybdenum Theme_Keyword: Gold Theme_Keyword: Platinum Theme_Keyword: Palladium Theme_Keyword: Silver Theme_Keyword: Mineral Resources Theme_Keyword: Deposit Models Theme_Keyword: Ore Theme_Keyword: Reserves Place: Place_Keyword: World Access_Constraints: None Use_Constraints: uses constrained Security_Information: Security_Classification: Unclassified Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 1; ESRI ArcCatalog 9.0.0.535 Data_Quality_Information: Logical_Consistency_Report: Variable by record Lineage: Process_Step: Process_Description: Compiled Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Point Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: porCu.fp6 Attribute: Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: OtherNames Enumerated_Domain_Value_Definition: Alternative names that have been used for the deposit. Enumerated_Domain: Enumerated_Domain_Value: Includes Enumerated_Domain_Value_Definition: Names of deposits that have been combined with the primary deposit as a result of the two-kilometer minimum separation rule. Enumerated_Domain: Enumerated_Domain_Value: Country Enumerated_Domain_Value_Definition: Country. Enumerated_Domain: Enumerated_Domain_Value: CountryCode Enumerated_Domain_Value_Definition: Abbreviated version of the country information fond in Table 1. Enumerated_Domain: Enumerated_Domain_Value: StateProvince Enumerated_Domain_Value_Definition: "State, Province, or local regional information.„ Enumerated_Domain: Enumerated_Domain_Value: Type Enumerated_Domain_Value_Definition: "Deposit type number coded as listed in USGS Bulletins 1693 (Cox and Singer, 1986). Subtypes of porphyry copper deposits are defined in Cox and Singer (1992) as: porphyry Cu-Au (type 20c) if Au/Mo greater than or equal to 30, porphyry Cu-Mo (type 21a) if Au/Mo less than or equal to 3, and porphyry Cu (type 17) otherwise, where gold is in parts per million and molybdenum is in percent. Skarn-related porphyry copper deposits (type 18a) were not addressed". Enumerated_Domain: Enumerated_Domain_Value: LatitudeDegrees Enumerated_Domain_Value_Definition: LatitudeDegrees. Enumerated_Domain: Enumerated_Domain_Value: LatitudeMinutes Enumerated_Domain_Value_Definition: LatitudeMinutes. Enumerated_Domain: Enumerated_Domain_Value: LatitudeSeconds Enumerated_Domain_Value_Definition: LatitudeSeconds. Enumerated_Domain: Enumerated_Domain_Value: LatitudeDecimal Enumerated_Domain_Value_Definition: LatitudeDecimal. Enumerated_Domain: Enumerated_Domain_Value: LongitudeDegrees Enumerated_Domain_Value_Definition: LongitudeDegrees. Enumerated_Domain: Enumerated_Domain_Value: LongitudeMinutes Enumerated_Domain_Value_Definition: LongitudeMinutes. Enumerated_Domain: Enumerated_Domain_Value: LongitudeSeconds Enumerated_Domain_Value_Definition: LongitudeSeconds. Enumerated_Domain: Enumerated_Domain_Value: LongitudeDecimal Enumerated_Domain_Value_Definition: LongitudeDecimal. Enumerated_Domain: Enumerated_Domain_Value: Emplacement Depth Enumerated_Domain_Value_Definition: "The depth of emplacement of the porphyry copper deposits in kilometers recorded when it was estimated in the literature.„ Enumerated_Domain: Enumerated_Domain_Value: MapNumber Enumerated_Domain_Value_Definition: Unique number keyed to map. Enumerated_Domain: Enumerated_Domain_Value: DiscoveryDate Enumerated_Domain_Value_Definition: The discovery date if recorded. Enumerated_Domain: Enumerated_Domain_Value: StartupDate Enumerated_Domain_Value_Definition: Start up date listed when known. Enumerated_Domain: Enumerated_Domain_Value: Tonnage Enumerated_Domain_Value_Definition: "Millions of metric tons based on the total production, reserves, and resources at the lowest possible cutoff grade.„ Enumerated_Domain: Enumerated_Domain_Value: Copper grade Enumerated_Domain_Value_Definition: Percent metal. Enumerated_Domain: Enumerated_Domain_Value: Molybdenum grade Enumerated_Domain_Value_Definition: Percent metal. Enumerated_Domain: Enumerated_Domain_Value: Gold grade Enumerated_Domain_Value_Definition: Grams/metric ton. Grades not available are treated as zero. Enumerated_Domain: Enumerated_Domain_Value: Silver grade Enumerated_Domain_Value_Definition: Grams/metric ton. Grades not available are treated as zero. Enumerated_Domain: Enumerated_Domain_Value: Comments Enumerated_Domain_Value_Definition: "Contains supplementary information about incompletely explored deposits and some grades such as Pt and Pd when available. Two significant digits are presented for gold, silver, and molybdenum grades, but three significant digits are used for tonnage and copper grades.„ Enumerated_Domain: Enumerated_Domain_Value: DepositAge Enumerated_Domain_Value_Definition: Ages are in standard divisions of geologic time or in millions of years when available. Enumerated_Domain: Enumerated_Domain_Value: AgeMY Enumerated_Domain_Value_Definition: "Ages are reported in millions of years before the present, based on reported absolute (typically thermal dates) ages or midpoints of geologic time scale units (Remane, 1998).„ Enumerated_Domain: Enumerated_Domain_Value: Mineralogy Enumerated_Domain_Value_Definition: List of ore and alteration mineralogy mentions in references. By nature the list is of highly variable quality depending on authorsƒ purpose. Most common rock forming minerals are excluded. Enumerated_Domain: Enumerated_Domain_Value: SulfideArea Enumerated_Domain_Value_Definition: area of pyrite zone in square kilometers. Enumerated_Domain: Enumerated_Domain_Value: SulfideAAxis Enumerated_Domain_Value_Definition: area of pyrite zone in square kilometers. Enumerated_Domain: Enumerated_Domain_Value: SulfideBAxis Enumerated_Domain_Value_Definition: area of pyrite zone in square kilometers. Enumerated_Domain: Enumerated_Domain_Value: AlterArea Enumerated_Domain_Value_Definition: area of alteration zone in square kilometers. Enumerated_Domain: Enumerated_Domain_Value: AlterAAxis Enumerated_Domain_Value_Definition: the major alteration zone axis in km. Enumerated_Domain: Enumerated_Domain_Value: AlterBAxis Enumerated_Domain_Value_Definition: "alteration zone minor axis in km,„ Enumerated_Domain: Enumerated_Domain_Value: OreArea Enumerated_Domain_Value_Definition: area of ore zone in square kilometers. Enumerated_Domain: Enumerated_Domain_Value: OreAAxis Enumerated_Domain_Value_Definition: area of ore zone in square kilometers. Enumerated_Domain: Enumerated_Domain_Value: OreAAxis Enumerated_Domain_Value_Definition: area of ore zone in square kilometers. Enumerated_Domain: Enumerated_Domain_Value: RocksInDeposit Enumerated_Domain_Value_Definition: rocks that are represented in the deposit itself and not observable on a regional map. Enumerated_Domain: Enumerated_Domain_Value: RocksOnMapInDeposit Enumerated_Domain_Value_Definition: Rocks that are recorded both in the deposit and on a regional map. Enumerated_Domain: Enumerated_Domain_Value: RocksOnMap Enumerated_Domain_Value_Definition: "Rocks on a regional map, but not in the deposit.„ Enumerated_Domain: Enumerated_Domain_Value: Assoc Deposits less 5km Enumerated_Domain_Value_Definition: "Other deposits with in 5 km coded as the deposit type number and deposit type as listed in USGS Bulletins 1693 (Cox and Singer, 1986) and 2004 (Bliss, 1992)". Enumerated_Domain: Enumerated_Domain_Value: Assoc Deposits less 10km Enumerated_Domain_Value_Definition: "Other deposits with in 10 km coded as the deposit type number and deposit type as listed in USGS Bulletins 1693 (Cox and Singer, 1986) and 2004 (Bliss, 1992)". Enumerated_Domain: Enumerated_Domain_Value: References Enumerated_Domain_Value_Definition: List of source(s) of data. 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