Primrose Mine airshaft grate, Cougar Mountain Regional Wildland Park, King County, Washington, USA.
The grid of an iron grate seals an old mine. 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.Add to Cart Add to Lightbox Download