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Yogo Gulch, Montana, Sapphire Mine Locale

Shown above left is the south-western portion of the Yogo Gulch sapphire mine as it appeared in 1985. The sapphire deposit is actually a lamproite dike that intruded a fissure in the earth millions of years ago. The dike stands on end, varies from a few feet, to almost 100 feet in width, and runs across country for over five miles. This is the area of Yogo Gulch where the Vortex miners developed an undergound mine that worked an extension of the lamproite dike system. In March of 2012 Mike Roberts, the owner/operator of the Robert's Mine (obtained from the Vortex Group), was killed in a mining accident.