There's gold and silver in them thar coulee walls

In the 1930s, the coulee walls behind Electric City and Delano were being prospected for gold and silver. These deposits occurred near the base of the Coulee Wall, in granite, overlain by basalt. The land was owned by James O. Black of Electric City and Joseph Rosauer of Opportunity Washington. Rosauer was a Spokane grocer whose family would form the beginnings of the Rosauer's Supermarket chain i...