Colonial Mill and mine ruins located within Wittenoom Gorge. The large concrete area on the upper level is the former mining offices and railway workshops, a sharp eye will see the sealed mine entry with a red door. Concrete foundations remain of the once impressive crusher, mill, dryer and bagging plant. See images of the site intact here , 194-08 shows the sealed red entry point. Geodata: -22.3112605 118.3190326 .