 | 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...Isotopic measurements of oxygen in supergene kaolinite from Boyongan suggest that local paleometeoric...–5.7 per mil. At the latitude of the southern Philippines, this value corresponds to Pleistocene rain water |  | | Journal (article/letter/editorial) | | Porphyry copper deposits account for 60% of the world's mine production of copper and constitute 80% of ore reserves...Bering (pers. commun., 1980), Bering (1984) Philippines 9. Dizon Silltoe and Gappe (1984); Malihan (1987)...Madamba (1972); Kerntke (1992) 10. Tirad 11. Batong-Buhay 12. Far South East 13. Atlas Papua New-Guinea...Schwartz, 1984), Tangse (van Leeuwen et al., 1987) Philippines: Marcopper (Loudon, 1976),2 Santo Nino (Bryner...sericite kaolinite. ± Advanced argillic: Feldspar altered to aluminum-rich phases (dickite, kaolinite, pyrophyllite |  | | Journal (article/letter/editorial) | | Emerging Porphyry District in Northeast Mindanao, Philippines* David P. Braxton,1,2,†,** David R. Cooke,1,3...American Exploration (Philippines) Inc., 21 Outlook Drive, Baguio City 2600, Philippines Abstract The Boyongan...the Surigao district of northeast Mindanao, Philippines. Since their formation in the early Pleistocene...pervasive illite and alunite-pyrophyllite-dickite-kaolinite alteration assemblages that have overprinted K...historic Surigao Au district of the southern Philippines (Fig. 1). Recent mineral resource estimates for |  | | Book (edition) | | • t --•- """"" ' The Lornex copper-molybdenum mine and plant, Highland Valley, British Columbia. (By...measurements have been retained in specific cases such as mine levels when measured in feet, values of gold and...developing an annual ton of new copper capacity from mine through the refinery without intrastructure costs...fold in three years. As an example, the " Surface Mine Control and Reclamation Act,' ' which was initially...resources in the future.'' In 1977, a surface coal mine regulation that greatly restricts the areas of strip |
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