Report of placer possibilities of the Grayback mining district, Costilla County, Colorado

McAuliffe, Joseph2018-11-192022-02-032018-11-192022-02-03https://hdl.handle.net/11124/172760Mine report no. 1000.reportsengIn copyright - non-commercial use permitted (http://rightsstatements.org/vocab/InC-NC/1.0/).Mines and mineral resources -- Colorado -- Costilla CountyGold -- Colorado -- Costilla CountyDredging -- Colorado -- Costilla CountyGrayback Mining District (Colo.)Report of placer possibilities of the Grayback mining district, Costilla County, ColoradoText