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 Post subject: Lemhi Pass name origin
PostPosted: Jan 03, 2015 4:18 pm 
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The Lemhi Pass in Idaho is considered the richest deposit of thorium in North America.

I had always wondered about the origin of the name "Lemhi" because it sounds similar to names of characters in the Book of Mormon. So I did a little investigating and found that the Lemhi Pass gets its name from Fort Lemhi, which was an early Mormon mission to that area in Idaho. Fort Lemhi was originally named Fort Limhi, and was named after a king named Limhi who lived in the second century BC.

So my suspicion ended up being confirmed.


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PostPosted: Jun 01, 2016 12:34 pm 
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Aside from the name origin, I found this on the Lemhi Pass rich thorium deposit:

Circular T336, Idaho’s “Wonder Vein” and the $2 Company Leading the “New Era of American Power”

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PostPosted: Jun 04, 2016 12:57 pm 
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Kirk Sorensen wrote:
The Lemhi Pass in Idaho is considered the richest deposit of thorium in North America.

Geochronology of Iron Oxide-Copper-Thorium-REE Mineralization in Proterozoic Rocks at Lemhi Pass, Idaho, and a Comparison to Copper-Cobalt Ores, Blackbird Mining District, Idaho - December 30, 2008

Part of the Missouri River Ecosystem Restoration Plan (MRERP) "created to help address conflicts between The Army Corps of Engineers, both local and federal governmental agencies, the general public, and local stakeholders with the intent to restore ecosystem functions, mitigate habitat losses, and recover native fish and wildlife while seeking balance with social, economic, and cultural values for future generations."
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In contrast to the intrusives, rare earth element compositions of the thorium-REE veins show a definitely unusual pattern of middle rare earth (MREE) enrichment relative to chondritic values (Figure 25). This has been noted by previous workers in the Lemhi Pass District. It is of both geologic and economic interest since neodymium is currently used in several high tech applications, such as magnets. The other middle rare earths are also of considerable economic importance, but carbonatites and other easily mined REE deposits tend to be LREE-enriched.

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