. Transactions. bundance that the Cordilleraof the island of Luzon, from Montufar Point in San Bernardino Straits to CapeBojeador, is composed of no other mineral than iron, its ranges, of the third order,being in content and structure totally iron of the best quality, the more valuable inthat its combinations are such as to facilitate its fusion and to render its reductionto metal simple. Today, however, it is recognized that the iron-ore deposits in theEastern Cordillera of Luzon constitute, not a continuous belt, but aseries of widely separated deposits, including a half dozen ore bodieswit
. Transactions. bundance that the Cordilleraof the island of Luzon, from Montufar Point in San Bernardino Straits to CapeBojeador, is composed of no other mineral than iron, its ranges, of the third order,being in content and structure totally iron of the best quality, the more valuable inthat its combinations are such as to facilitate its fusion and to render its reductionto metal simple. Today, however, it is recognized that the iron-ore deposits in theEastern Cordillera of Luzon constitute, not a continuous belt, but aseries of widely separated deposits, including a half dozen ore bodieswithin a distance of 10 miles in Bulacan Province, a single outcrop atSanta Inez, Rizal Province, farther south, and three deposits around * Published by permission of the Director, Bureau of Science. Manila, P. Chief, Division of Mines, Bureau of Science. WALLACE E. PRATT 91 the margin of the Mambulao-Paracale gold-mining district in CamarinesProvince, 100 miles farther to the east-southeast. Other unimportant. Fig. 1. occurrences of magnetite-hematite ores are known, but the foregoing,together with the lateritic ores in Surigao Province, Mindanao, containthe economically important iron-ore reserves of the Philippines.^ 92 the iron ores of the philippine islands Magnetite-Hematite OresGeneral The deposits of magnetite-hematite ores are found in the lowerpart near the base of the Miocene sedimentaries and along the contactof this series with the older igneous-complex upon which it rests. Someof the orebodies are entirely within the older igneous rocks close to thecontact. Intrusive rocks are associated with each of the orebodies andpenetrate the sedimentaries, the older igneous rocks, and even the ore-bodies at places. The igneous-complex includes deep-seated, intrusive,and extrusive types; in Bulacan, intrusive diorite and andesite, andesiteflows, agglomerates, and tuffs; in Camarines, peridotite and in Bulacan and in Camarines, also, there are areas of hornbl
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
