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The only lodes known in the Aleutian Islands region are gold deposits (some of which may have been productive) and occurrences of metallic sulfide minerals on Unalaska and neighboring Amaknak and Sedanka Islands (Berg and Cobb, 1967, P. 7â8, fig. 2).
The deposits form in deep ocean water by the precipitation of sulfide minerals released by submarine volcanoes. Volcanic fluids and hot seawater move through the volcanic rocks and leach metals. The deposits are associated with lava flows, breccia, water-deposited tuffs, cherts, sulfates, and limestones.eposits of nickel sulfides are mined from greenstone belts in many ancient volcanic terranes. The ore is associated with ultramafic lava flows called komatiites. Komatiites have more than 18 weight % magnesium oxide (MgO) and large amounts of the mineral olivine.