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2. Yogo sapphire - Wikipedia

   en.wikipedia.org/wiki/Yogo_sapphire

   "Yogo sapphire" is the preferred term for gems found in the Yogo Gulch, whereas "Montana sapphire" generally refers to gems found in other Montana locations. [18] More gem-quality sapphires are produced in Montana than anywhere else in North America. [18] Montana sapphires come in a variety of colors, though rubies are rare. [16] [18] [23]

3. Little Belt Mountains - Wikipedia

   en.wikipedia.org/wiki/Little_Belt_Mountains

   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.

4. Stillwater Mining Company - Wikipedia

   en.wikipedia.org/wiki/Stillwater_Mining_Company

   Stillwater Mining Company is engaged in the development, extraction, processing, refining and marketing of palladium, platinum and associated metals (platinum group metals or PGMs) from a geological formation in the Stillwater igneous complex in south central Montana known as the J-M Reef and from the recycling of spent catalytic converters.

5. Montana miner to lay off hundreds due to declining palladium ...

   www.aol.com/montana-miner-lay-off-hundreds...

   FILE - The Stillwater Mining Company, the only platinum and palladium mine in the United States, is seen near Nye, Mont., May 2, 2013. (AP Photo/Matthew Brown, File) (ASSOCIATED PRESS)

6. Montana miner backs off expansion plans, lays off 100 due to ...

   www.aol.com/montana-miner-backs-off-expansion...

   The owner of two precious metals mines in south-central Montana is stopping work on an expansion project and laying off about 100 workers because the price of palladium fell sharply in the past ...

7. List of U.S. state minerals, rocks, stones and gemstones

   en.wikipedia.org/wiki/List_of_U.S._state...

   Montana Agate (1969) Nebraska [45] Prairie agate (1967) Blue chalcedony (1967) Nevada [46] [47] Metal: Silver (1977); Nevada's nickname is the Silver State: Sandstone (1987) Precious Gemstone: Virgin Valley black fire opal (1987) Semiprecious Gemstone: Nevada turquoise (1987) New Hampshire [48] Beryl (1985) Granite (1985); New Hampshire's ...