Ring Mountain, also called Crucible Dome, is a tuya in the Mount Cayley volcanic field, British Columbia, Canada. It has a horseshoe shaped crater, located on the east side of the upper Squamish River. Outcrops on Ring Mountain's western side contain highly variable, fine-scale jointing and are locally broken down into many small spires and knobs. The age of Ring Mountain is unknown, but probably formed during the like most tuyas in Canada.