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Yogo sapphires were ultimately traced from the alluvium to their source. [31] In February 1896, a sheepherder named Jim Ettien found the sapphire mother lode: the Yogo dike. [21] [61] [62] Ettien was prospecting for gold, and found sapphires after washing gravel he found in a fissure within a limestone outcrop. [44] Ettien staked two claims.
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The sapphires, called Yogo sapphires as they are mined near Yogo Creek, occur in a formation three miles (4.8 km) long and eight feet (2.4 m) across. [ 1 ] The mountains are named for a butte in the range, Belt Butte, itself named for a band of white rock which encircles it.
Sapphires of gem quality are found in the region. They were first found in this region at Rock Creek near Philipsburg in 1892. Rock Creek, also known as Gem Mountain, has been the most productive site in Montana for sapphires by far, even more so than Yogo Gulch, producing over 190 million carats of sapphires [citation needed].
The mineralogy of the gem deposits varies widely with, among others, corundum (sapphire, ruby), chrysoberyl, beryl, spinel, topaz, zircon, tourmaline, garnet being common. [2] Residual deposits are mainly found in flood plains of rivers and streams. The metamorphic types of gems constitute 90% of the gem deposits in Sri Lanka.
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