Level Lead Mine In Dubuque, Iowa | The Diggings™ - Mathias Ham Historic Site | Iowa History
with a number of others the lowest member of the D^Qrah formation brought to you by State Historical Society of Iowa 1807-1860. Source. Photographs scanned using Epson Expression 1680 scanner at 300 ppi IA Lead mines is a historic district that contains a nationally significant concentration of more than 100 archeological sites associated with the mining of lead from 1788 to 1865. The district lies along the narrow creeks and in the limestone bluffs and rolling countryside west of the Mississippi River in Dubuque,
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