The Seventy-Nine Lead-Copper Co. assumed control of the property in 1928. A 60-ton concentrator built onsite treated 10,483 tons of zinc-lead ore from the Discovery and Massive Pyrite ore bodies.

Adam Gopnik, a staff writer, has been contributing to The New Yorker since 1986. During his tenure, he has written fiction, humor, criticism, book reviews, personal essays, Profiles, and reported ...