Marks, John H.Van Wagenen, Theodore F.2020-05-072022-02-032020-05-072022-02-03https://hdl.handle.net/11124/174092Mine report no. 1524.Includes maps.Letter of correspondence dated, July 14, 1928 -- The Summit Silver Producing Company, Dillon, Summit County, Colorado / John H. Marks -- Report on the Thunderbolt group of mines.reportsengIn copyright - non-commercial use permitted (http://rightsstatements.org/vocab/InC-NC/1.0/).Mines and mineral resources -- Colorado -- Summit CountyOres -- Colorado -- Summit CountyAssaying -- Colorado -- Summit CountyBoss-Thunderbolt Mine (Colo.)Boss Mine (Colo.)Wilkinson Mining District (Colo.)Text