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Lead and Zinc Mining in the Dubuque Area ... Encyclopedia Dubuque. 18 Sep 2016 LEAD mining was carried on in the area as early as 1685 when East Dubuque and mined ...

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History of Lead and Zinc Mining in Iowa ... The area includes most of the productive crevices of Dubuque connty. Lead is reported

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Lead and Zinc Mining in the Dubuque Area ... The economic life of the district was extended indefinitely when the commercial production of metallic zinc began in 1860.

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Lead and Zinc Mining in the Dubuque Area. As a general rule, production records were not kept, mines were not surveyed, nor were mine locations plotted.

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Geology and zinc-lead deposits in the Couler Valley area, Dubuque County, Iowa ... Geology and zinc-lead deposits in the Couler Valley area, Dubuque County, Iowa

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