Abstract
The deposits which have been studied include the Blackstone, Temperley, and Teasdale mines. Most of the observations were made on sediment-ore-structure relationships. The ores lie in layers and breccia near, and in sag or basin structures at the base of the Quimbys Mill Member of the Platteville formation. The structure and bedding relationships of the contorted calcite and sphalerite bearing limestone layers show that the ores were present in the sediment during deformation. Geopetal and compaction features such as sphalerite nodules in carbonaceous limestones and the bulged ore layers further indicate a sedimentary and diagenetic formation for the ores.
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