1897. The project was financed by Pennsylvania and New York capitalists. The large portal was near the base of Spencer Mountain and contained two sets of tracks to haul loaded ore cars from mining points to bins near the portal, where the ore could...
Mining engineers--Colorado--Eldora--1930-1940.; Eldora (Colo.)--1930-1940.; Gilpin County (Colo.)--1930-1940.; Cats--Colorado--1930-1940.; Gold mining--Colorado--Eldora--1930-1940.; Pioneers--Colorado--Eldora--1930-1940.; Gilfillan, John A.
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