Yogo. But they're opposite direction from this property, up in the Little Belts. Jake Hoover, western artist Charlie Russell's friend, is credited with finding them. The mine, 45 miles southwest of Lewistown, is the only producing sapphire dike mine in North America, and possibly the world.
A unique quality of Yogo Sapphires is that they retain their brilliance under artificial light. Sapphires from other parts of the world generally absorb light, making them appear black and lustreless. They never require heat treating and are very special gem, found in crown jewels is several countries in Europe. One of my favorites--I've got a few, also a couple of dandys from 'west-side', over by PBurg.
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