Masinloc (119.92E 15.57N) is a small port on the west Luzon, north of Manila Bay in the Philippines. There are significant deposits of chromium and manganese in the nearby Zambales ophiolite complex (120.09E 15.56N), a region of former deep oceanic crust that was thrust to the surface by tectonic action. Manganese production was about 15,000 tons a year. The chromite deposit here is the largest in the world and produced about 92,000 tons a year.

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Van Royen and Bowles (1952)

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