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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).
Titanium occurs in rocks in the form of oxide and silicate minerals. Of greatest economic value are titanium-bearing oxide minerals such as ilmenite, rutile, anatase, brookite, perovskite and magnetite. Rutile (titanium dioxide) and ilmenite (35% - 65% titanium dioxide) are the two primary sources of titanium products, with ilmenite the most abundant (Force, E.R, 1991). Ilmenite ore is sourced through the mining of magmatic and heavy mineral sand (also referred to as placer) deposits.