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Mine Tales: Mining district near Tombstone busy for decades (from http://www.bing.com/news/apiclick.aspx?ref=FexRss&aid=&tid=63e9a3cd37e7419692cb6f1e15992284&url=https%3a%2f%2ftucson.com%2fnews%2flocal%2fhistory%2fmine-tales-mining-district-near-tombstone-busy-for-decades%2farticle_aaf156a2-96c1-11ed-bf84-3bafda8699e5.html&c=11931922905629709741&mkt=en-us)
Gleeson Ridge includes manganese deposits found in Pennsylvanian Naco limestone fractures ... and production in the district ran high due to activity among the Calumet and Arizona, Great Western and ...