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M. B. Johnson was an executive secretary for mines located in and around Pioche, Nevada. Includes correspondence, reports, assay reports, and maps of Pioche, Nevada, area mines and companies under Johnson's supervision: Black Prince Mine, Black Bess Mine, Combined Metals Reduction Company, Raymond-Ely Company, Mascot Silver Mines, Kismet Group of Mining Claims, Pioche-Bristol Group of Mining Claims, Imperial Lead Mining Company. There is also correspondence from Johnson's business...
- Subject: Mines and mineral resources -- Nevada -- Lincoln County
- Subject: Mascot Silver Mines