Collected here are photos of iron mining in the hamlet of Lyon Mountain in the Town of Dannemora. The mines, which opened in the 1800s, were originally open-pit but eventually transitioned into underground mining. Although they were originally owned by the Chateaugay Ore & Iron Company, the mines were bought by Republic Steel in the late 1930s. To see more, check out our collection of photos from the Republic Steel mine in Mineville.