mineralization or alteration within two (2) kilometers was combined into one deposit. Some examples illustrate the effects of the application of this rule. In many other lists of mineral deposits, Chuqui Norte, Exotica, Radomiro Tomic (Pampa Norte), and Chuquicamata in Chile are reported as separate deposits, whereas, here they are reported as one because of the two kilometer rule. El Pachon in Argentina and Los Pelambres in Chile are two parts of the same deposit, frequently reported as separate deposits. Here they are reported as one record (deposit) but with El Pachon in Argentina acting as a place holder pointing to Los Pelambres in Chile which contains the information on both. DATA FIELDS The information on the porphyry copper deposits is contained in the files PorCu.FP5 and PorCu.txt which are FileMaker Pro 5 and tab-delineated text files respectively. The fields in both files are described below. Deposit Name The most recent deposit name is used. There is another field, "OtherNames," which contains alternative names that have been used for the deposit. A third field, "Includes," provides the names of deposits that have been combined with the primary deposit as a result of the two-kilometer minimum separation rule. Locations A number of fields are provided to show the deposit's location. "Country" and "StateProvince" are used for general locations. "CountryCode" is an abbreviated version of the country information (Table 1). Degrees, minutes, and, in some cases seconds, of longitude and latitude are provided in the separate fields. Decimal degrees of latitude ("LatitudeDecimal") and longitude ("LongitudeDecimal") are calculated from the degrees, minutes and seconds fields. Southern latitudes and eastern longitudes are negative values. The field "Map number" is used to identify the location of the deposit on maps supplied in this publication. Activity Where the discovery date is know it is recorded ("DiscoveryDate"). If a deposit is known to be a prospect at the time of this publication it is recorded as a "yes" in the "Prospect?" field. If mining is known to have started, the date is listed in the "StartUp" field.
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