E/MJ : engineering and mining journal . ^^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. WHERE SOME OF THE COPPER AND ZINC HAS GONECartridge cases from ammunition expended by 75-mm. guns somewhere behind the trenches December 16, L916 ENGINEEEING AND MINING JOUBNAL

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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries