Copper deposits near Keating, Oreg.

TL;DRAbstract

The copper deposits near Keating, Oreg., in the southwestern foothills of the Wallowa Mountains, form part of a series distributed along a belt over 75 miles long.The belt containing copper deposits extends from a point west of North Powder to and beyond the Snake River at Homestead.The area is underlain by three groups of rocks a greenstone series consisting of albitic volcanic rocks, both massive and pyroclastic, together with dioritic and granitic intrusive bodies and a few limestone lenses; an intermediate series of lavas and lacustrine deposits; and a younger series of superficial terrace gravel, talus, and slide rock.The older series is of Permian age except the intrusive rocks, which are probably Mesozoic; the intermediate series is of Miocene age; the younger series is Pleistocene and Recent.The Permian rocks are steeply, possibly isoclinally folded; the Tertiary rocks are gently warped and faulted, though the faults are generally of slight magnitude; the Quaternary deposits ar

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