Photograph of a placer gold mining operation. Placer is an open pit form of mining using water pressure to extract minerals from the earth without tunneling.
Geology -- Washington (State); Strip mining; Fort George Wright (Wash.) -- History
Photo of a gravel pit located at Fort George Wright in Spokane, WA. Photo includes quarrying machinery and an automobile from the period (1920's or 1930's).
Grand Coulee Dam (Wash.);Hydroelectric power plants -- Washington (State);Dams -- United States -- Design and construction; Concrete construction; Gravel.
Aerial view of the Brett gravel pit. This was a source of aggregate for concrete used in the construction of the Grand Coulee Dam. View is looking generally south.