The BCI orebody in Rapu-Rapu Island, Albay is a volcanogenic sulphide deposit containing pyrite, 1.8% Cu, 2.5% Zn, 0.8% Pb plus 40 grams per ton Ag and 2 grams per ton Au. The orebody is overlain by quartzofeldspathic muscovite schists and underlain by a thick zone of metamorphosed spilitic lava flows intercalated with agglomerates. The deposit is believed to have been formed subaqueously by volcanic-fumarolic activity which occurred periodically during volcanism, and concentrated by folding (Hutchinson, 1973).