Primrose Mine airshaft, Cougar Mountain Regional Wildland Park, King County, Washington, USA.

The #4 coal seam airshaft extends 1200 feet underground to the Primrose Mine at an elevation 780 feet below its opening, in Cougar Mountain Regional Wildland Park, King County, Washington, USA. The Newcastle coal seams were laid down in a salt-water lagoon of the Pacific Ocean. Over 20 million years, plate tectonics tilted the flat coal beds to a 42 degree angle, making removal more expensive. The peak of coal mining here fueled World War I trains, ships, and factories.

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Filename: 1204COU-004_Primrose-Mine.jpg
Copyright: © Tom Dempsey / PhotoSeek.com
Image Size: 4500x3375 / 5.7MB; http://www.photoseek.com/; energy history
Contained in galleries: Cascades I90 to US2: mountains

The #4 coal seam airshaft extends 1200 feet underground to the Primrose Mine at an elevation 780 feet below its opening, in Cougar Mountain Regional Wildland Park, King County, Washington, USA. The Newcastle coal seams were laid down in a salt-water lagoon of the Pacific Ocean. Over 20 million years, plate tectonics tilted the flat coal beds to a 42 degree angle, making removal more expensive. The peak of coal mining here fueled World War I trains, ships, and factories.