I am pretty certain now that these "Tsatang" are Tsaatan people. Tsaatan are Tuvans, whose territory was divided when the current Mongolian borders were created. The Tuvans were repeated expelled when they tried to roam in their Mongolian territories until they were given Mongolian citizenship in 1955. They continue to use tee-pees today, and the city "Muren" must be Mörön.
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Lake Hovsgol in winter, 1960