Summary of the geology and mineral resources of

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SUMMARY OF THE GEOLOGY AND MINERAL RESOURCES OF MINDORO ISLAND Mindoro Island is one of the major islands of the Philippine archipelago covering a land area of 10,244 square kilometres or 102,440,000 hectares. It lies about 130 kilometers south of Manila across Verde Island Passage. It is bounded on the east by the Tablas Strait, on the south by the Senirara Island, and on the west by the Mindoro Strait. The major physiographic feature of the island is the central mountain ranges. Its topography, which is controlled by lithology and partly by structures, is characteristically rugged and forms the physiographic divide between Occidental and Oriental Mindoro. Most peaks on this divide range from 900 meters to more than 2,400 meters in elevation. These peaks are Mount Burburungan (1,524 m), Mout Tandrac Peak (900m) and Mount Baco (2,488m). Major structures observed in the Island trend northwest to north-south. Other prominent physiographic feature includes the 10 kilometers wide and 15 kilometers long Naujan Lake located on its northeastern section. Narrow, swampy coastal plain fringes the WSW and ENE portion of the island. Northeast trending river systems namely: Bugsanga, Lumintao, Monpong, Amnay and Mamburao Rivers comprise some of the major drainages on the western portion of Mindoro Island while Magasawang Tubig, Pinamalayan and Bongabong River Systems comprise the major drainage lines in the eastern section of the island. A. General Geology of Mindoro Island Based from the Geological and Mineral Inventory Map of Mindoro Island (RP-Japan Project, JICA-MMAJ, 1984), the regional stratigraphy of the area comprises the following rock formations from oldest to youngest: a) the Halcon Metamorphics b) the Baco Group which is further subdivided into the Mansalay Formation and the Lumintao Formation c) the Mamburao Group d) the Sablayan Group, e) the Bongabong Group f) the Socorro Group, and g) the Quaternary Alluvial Deposits. Brief descriptions of the geology and its distributions within the province of Occidental and Oriental Mindoro are discussed below: Pre-Jurassic to Jurassic Halcon Metamorphics - This is the oldest rock formation in the island. It comprises metaconglomerates, schists and phyllites which form the backbone of the northwest ranges. The rocks crop out
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around the northwestern coast and the areas from Puerto Galera to Mt. Halcon. Jurrasic Baco Group This Group is composed of volcanic and clastic rocks that slightly undergone metamorphism. It is divided into two formations: the lower Mansalay Formation comprising predominantly of clastic rocks such as shale, sandstone, and slate to phyllite; and the upper Lumintao Formation composing mainly of basalt with basaltic tuff, sandstone, shale and slate to phyllite. The Mansalay Formation is distributed in a long belt from Mamburao to Mansalay in a northwest-southeast direction, while Lumintao Formation crops out from Lumintao River to Mamburao on the western side of the island. Exposures were also found in the upper reaches of Pula River and Balete River west of Pinamalayan. Other major outcrops were observed in the middle reaches of Bongabong River
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  • Spring '18
  • Coal, Provinces of the Philippines, Oriental Mindoro, Occidental Mindoro, MINDORO ISLAND

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