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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 Mantle is almost completely silicate, and is rich in magnesium. The minerals of olivine and pyroxene are most common, and an aluminum-bearing mineral. Earth has two types of crust - oceanic and continental. Oceanic crust is composed of basalt, the result of partial melting of the mantle. It is rich in Mg, Fe, Ca, Al which are in the minerals olivine, pyroxene plagioclase feldspar. Continental crust diverse, old, and composed of incompatible elements that do not fit well in the minerals stable in the mantle (K and Na).