E/MJ : engineering and mining journal . ? J : ,. ^^m^ PLANT OF THE YOGO SAPPHIRE MIXES IN FERGUS COUNTY, MONTANA Fergus County, Montana, is said to be the only locality in the world where sapphires are profitably mined in place, all other production coming from placers. The principal American deposit is now owned by a British company

---

Size: 2507px × 997px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries