Porphyry copper deposits of the world: Database, maps, and preliminary analysis

Abstract

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.

Long-lived, stationary magmatism and pulsed porphyry systems during Tethyan subduction to post-collision evolution in the southernmost Lesser Caucasus, Armenia and Nakhitchevan

“…5c), although the quality and accuracy of Au data must be treated with caution. For instance at Kadjaran, depending on the source of data (Table 1), the reported Au contents vary from 0.65 g/t (Singer et al, 2002) to 0.02 g/t (data communicated by the mine staff). In addition, further studies are required to understand if the reported Au grades are intimately associated with the porphyry event or…”

Development of a correlation between mineralogy, rock strength measures, and breakage of Copper Porphyries

“…The following subtypes of porphyry deposits are defined according to the metal abundance (Sinclair, 2008 From a geological perspective, porphyry copper deposits are considered to be one of the best-understood classes of hydrothermal systems operating above a crystallizing magma chamber which may have intruded its coeval stratovolcano (Hedenquist and Richards, 1998). , defines porphyry copper systems as large volumes (10 to >100 km 3 ) of hydrothermally altered rock centered on porphyry copper stocks that may also contain skarn, carbonate-replacement, sediment-hosted, and intermediate to the high sulfidation epithermal base and precious metal mineralization.…”

“…"In many porphyry deposits, alteration zones on a deposit scale consist of an inner potassic zone characterised by biotite and/or potassium-feldspar (± amphibole ± magnetite ± anhydrite) and an outer zone of propylitic alteration that consists of quartz, chlorite, epidote, calcite and, locally, albite associated with pyrite. Zones of phyllic alteration (quartz + sericite + pyrite) and argillic alteration (quartz + illite + pyrite ± kaolinite ± smectite ± montmorillonite ± calcite) may be part of the zonal pattern between the potassic and propylitic zones, or can be irregular or tabular, and younger zones could be superimposed on older alteration and sulphide assemblages (e.g., Ladolam; )" (Sinclair, 2008;p8). deposits.…”

“…Such zones have significantly higher Cu grades, thereby enhancing the potential for economic exploitation" (Sinclair, 2008 p1-2). The following subtypes of porphyry deposits are defined according to the metal abundance (Sinclair, 2008 The Eocene-Oligocene aged Cu porphyry deposits located in Chile are one of the important 'young' porphyry copper systems. Together with Escondida, the system has six other giant porphyry copper systems, namely Potrerillos, El Salvador, Chuquicamata, El Abra, Collahuasi and Radomiro Tomic.…”

Molybdenum deposits in the eastern Qinling, central China: constraints on the geodynamics

“…10.7 Mt, including 5.4 Mt in the USA, 2.5 Mt in Chile, 0.91 Mt in Canada, 0.36 Mt in Russia, and 1.67 Mt in other regions of the world (Ray 1995;Singer 1995;Kirkham and Sinclair 1996;Laznicka 1999;Mutschler et al 2000;Singer et al 2002). Based on the reserve data provided by the China National Mineral Resources Committee, Mo deposits in China can be classified into giant (.0.5 Mt), large (0.1-0.5 Mt), medium (0.01-0.1 Mt), or small (,0.01 Mt;Zhu 1999).…”