On the northern side of Sail Pass are the remains of a cobalt mine. The vein runs north-south and, although showing some cobalt, was found to contain a great deal more arsenic. The mine was opened in 1848, after great sums had been spent on a roadway and dressing plant. The total yield of cobalt was only a few ounces and the venture was swiftly abandoned. Several levels can be seen at the surface.