Encyclopedia Dubuque
"Encyclopedia Dubuque is the online authority for all things Dubuque, written by the people who know the city best.”
Marshall Cohen—researcher and producer, CNN
Affiliated with the Local History Network of the State Historical Society of Iowa, and the Iowa Museum Association.
ROCK BONE
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ROCK BONE. "Rock bone" was a term used by miners in Dubuque for a massive vein of smithsonite. Smithsonite, named for James Smithson, the founder of the Smithsonian Institution, has been and is still being used as an important, although rather minor ore of ZINC.
The ROYCE AND FROST MINE was a local source of rock bone.