. Transactions. of pyrite in depth and, consequently,should not be included in estimates of tonnage, but there is no indicationon the surface that pyrite actually increases in depth. Removal ofpyrite by oxidation near the surface, which would result in a proportion-ally greater pyrite content below the oxidized zone, does not appear tohave taken place to any important extent. For the deposits of ore in * hoc. cii., p. 106.^ Loc. cit., p. 113. 6 Trans. 1, 236 to 245 (1914).^ Trans., This volume, p. 38. * Loc. cit., p. 235. WALLACE E. PRATT 101 Rizal and Camarines no estimate of quantity can be
. Transactions. of pyrite in depth and, consequently,should not be included in estimates of tonnage, but there is no indicationon the surface that pyrite actually increases in depth. Removal ofpyrite by oxidation near the surface, which would result in a proportion-ally greater pyrite content below the oxidized zone, does not appear tohave taken place to any important extent. For the deposits of ore in * hoc. cii., p. 106.^ Loc. cit., p. 113. 6 Trans. 1, 236 to 245 (1914).^ Trans., This volume, p. 38. * Loc. cit., p. 235. WALLACE E. PRATT 101 Rizal and Camarines no estimate of quantity can be offered. TheCalambayanga deposit appears to be large; probably 100,000 tons arerepresented in the blocks of ore on the surface. Lateritic Iron OresGeneral On the eastern coast of Surigao Province in Mindanao there is anarea of about 40 square miles, bordering the sea for a distance of 10 125 50 MAP OF SURIOAO IKON OKE DEPOSIT SURIGAO, MISDANAO SCALE 1 M 0 1 3 4 Kir Based on Coast & GeodeticSurvey Charts 9 30. 125 50 9 30 Fig. 2.—Topographic Map of Iron-Ore Deposit in Surigao. Cross-hatchedAreas Best Parts of Deposit. Broken Line shows Approximately InteriorLimit of Deposit. Elevations in Meters. miles, which is conspicuously barren of vegetation and is covered with abright red soil. This condition is the more notable in that the surround-ing country is heavily forested and the singular barren appearance ofthis one section of the coast line has been a subject of interest for yearsto those who knew of it. But the region is sparsely inhabited and but fewboats pass along that coast; consequently it was not until the year 1914 102 THE IRON ORES OF THE PHILIPPINE ISLANDS when H. F. Cameron, an engineer who is famihar with the iron ores ofthe Nipe Bay region in Cuba, made an inspection trip through Surigaothat the Red Hills, as the area in question has been designated on theCoast and Geodetic charts, were found to be covered with laterite richenough in iron to constitute an ore. The
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
