 | Braxton, D. P., Cooke, D. R., Ignacio, A. M., Rye, R. O., Waters, P. J. (2009) Ultra-Deep Oxidation and Exotic Copper Formation at the Late Pliocene Boyongan and Bayugo Porphyry Copper-Gold Deposits, Surigao, Philippines: Geology, Mineralogy, Paleoaltimetry, and their Implications for Geologic, Physiographic, and Tectonic Controls. Economic Geology, 104 (3) 333-349 doi:10.2113/gsecongeo.104.3.333 | Journal (article/letter/editorial) | | Bayugo Porphyry Copper-Gold Deposits, Surigao, Philippines: Geology, Mineralogy, Paleoaltimetry, and their...American Exploration (Philippines) Inc. 21 Outlook Drive Baguio City, Philippines 2600 Abstract The Boyongan...the Surigao district of northeast Mindanao, Philippines. Exhumation and weathering of these Late Pliocene-age...shallower supergene copper oxide minerals (malachite + azurite + cuprite) to deeper sulfide-stable assemblages...–5.7 per mil. At the latitude of the southern Philippines, this value corresponds to Pleistocene rain water |  | | Report (issue) | | Clark and others, 2007). In the thermal infrared region, quartz and hydrous silica contain emission minima...a typical assemblage might include malachite + azurite + cuprite + chrysocolla, with minor amounts of...the magma is largely inherited from the source region (Carmichael, 1991). Other parameters, such as magma...and so forth) are also inherited from the source region. The compositional features and degree of magma...are assigned to the last intrusive event in the region (for example, host dacites evolving from cogenetic |  | Hodges, C.A., Cox, D.P., Singer, D.A., Case, J.E., Berger, B.R., Albers, J.P. (1984) U.S. Geological Survey-INGEOMINAS mineral resource assessment of Colombia. Open-File Report Vol. 1984 (84-345) US Geological Survey doi:10.3133/ofr84345 | Report (issue) | | sampling and geophysical surveying throughout the region, begun. The geologic environment of the shield...(oceanic). This zone, in the subsurface, separates the San Jacinto belt from the Sinu belt in the Tertiary basins...Central (Magdalena Valley), the Cordilleras Central and Occidental (Cauca-Patia Valley), the Cordillera...Cordillera Occidental and Serrania de Baudo (San Juan-Atrato Basin), the Serrania de Perija and Sierra Nevada de...percent of the deposits from the California-Oregon region in the United States contain 1,800 tonnes or more |  | | Report (volume) | | 12201 Sunrise Valley Dr. SALT LAKE CITY, Utah--Federal Bldg., Rm. 8105,125 South State St. SAN FRANCISCO...and effective resource assessment of such a broad region required that grade-tonnage models be created for...shown conclusively that the classic Mississippi Valley-type ores cannot have originated from either syngenetic...based on considerations that extend far beyond the mine itself, in some instances relating to the overall...subject, as in a scale model of the workings of a mine, to a unifying concept that explains or describes |  | | Book | | Arqueo/6gicas y Museo. Unii·ersidad Cat6lica de! Norte, San Pedro Alacama. Chile V. Oliveros Departamento de...limestones. The central depression (zone 2), or Central Valley, is a c.Jownwarp with a Mesozoic to Quaternary...several major cities. In southern Chile the centrai valley is not recognized and the transition between the...so-called ·fiat slab' zone). where the Central Valley is also absent. The northern volcanoes a re builL...nitrates from the evaporitic deposits of the Atacama region was paramount). Because of its economic in1portance |
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