in mineral rights at the site, which was worked sporadically for the remainder of his life. While prospecting for copper in Vermont, he also discovered iron ore in the valley of the Black River along the Connecticut River in 1835. He set up Tyson Furnace near Plymouth, Vermont to smelt it, and the furnace operated until his retirement in 1855. In 1845, he established the Baltimore Chrome Works company factory on the waterfront of the Northwest Branch of the Patapsco River of the Baltimore Harbor, at the western end of the Fells Point neighborhood (near modern skyscrapers development at Harbor East in the 1990s and subsequently the site of the long-time chrome works, last owned/operated by Allied-Signal in the 1980s and renamed as "Harbor Point" with a major controversial redevelopment project proposed in 2015 over the heavily-polluted capped soil surface). Baltimore Chrome Works was one of the largest facilities in the country then to refine the chromite into pigments, the primary use of the mineral at the time. Until then, this work had largely been done abroad, in Liverpool, England and elsewhere, and he continued to export chromite to manufacturers there. The expansion into pigment production helped cushion the shock when chromite deposits were discovered in Asia Minor (modern Turkey) in 1848 and began to supplant U.S. chromium ores. He continued iron and copper explorations, opening the Springfield Mine for those two metals in Sykesville, Maryland in southern Carroll County, just west of Bare Hills in 1849. Tyson married Hannah A. Wood, by whom he had at least four children: Rachel Tyson (1807?–1883), married John Jackson and established the Sharon Female Academy in Sharon, Pennsylvania Richard W. Tyson Jesse Tyson (1826–1906) James Wood Tyson (1828–1900) He purchased a large mansion townhouse on East Baltimore Street near Lloyd Street in the Old Town neighborhood, just east of the Jones Falls, and later established and further endowed the McKim School, a free school for the poor (elementary/grammar school level) in a landmark Greek Revival architecture style stone temple structure a block away, (still existent in 2017), prior to the formal establishment of city public schools in 1829. In the 1850s, he bought the Elba Furnace in Maryland for youngest son James to operate, and both James and Jesse followed him into the metallurgical profession. Tyson was posthumously inducted into the National Mining Hall of Fame in 1996. External links Wood Farm chromite