Nay-pyi-daw mine, Dattaw-mid, Dattaw-taung (Dattaw hill), Mogok Valley, Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar

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The ruby-bearing marble bands are very coarse-grained and the gems are mined in an open-pit scheme.

Ref: Ted Themelis (2008) Gems and Mines of Mogok, p. 204

Gemstone List

Corundum var: Ruby