http://www.ghosttownsofwashington.com/Skookum_Mine.html
mine shaft behind coke ovens? Skookum Tunnel Lat 47 06' 05" N Lon: 122 02' 06" W
directions?
Once in Wilkeson, drive east on Railroad Avenue past the Wilkeson School and ovens, both of which are interesting sites of their own accord, and keep a lookout for some large ruins in the woods on the right side of the road. Stop there, and if you proceed to the river behind the ruins (which are likely old loading bins) you'll be able to see the mine entrance.