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Boston and Colorado Smelting Company Assay Reports, Boulder [123574]

Currency:USD Category:Collectibles / Mining Start Price:120.00 USD Estimated At:240.00 - 600.00 USD
Boston and Colorado Smelting Company Assay Reports, Boulder  [123574]
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Lot of 4 assay memorandums, 3 different styles, for the Boulder Agency of the Boston & Colorado & Smelting Co. Reports for mines are in Sunshine (1882), Salina (1881 and 1886), and Boulder (1882). Each approx. 5.5 x 10.5" The Boston & Colorado Smelting Works were located in the town of Black Hawk, Gilpin County, Colorado, on the Clear Creek Narrow Gauge Railway, 55 miles from Denver. It was one of the first works erected for the metallurgical treatment of gold sulphuret ores. Gold, silver and copper was produced with lead if it existed, overlooked during extraction. The works were planned and built by Professor Nathaniel P. Hill, formerly of Brown University, Providence, Rhode Island in 1867. Hill later became a U.S. Senator from Colorado, 1879-1885 . In 1878 the company expanded and built the Argo Smelting works in Denver. The Boston & Colorado Smelting Co. was merged into the American Smelting and Refining Company (ASARCO) in 1899 and closed in 1908. Boulder Colorado 1881-1886