Photographs of core from 56 boreholes in Earth MRI focus areas in Wisconsin hosted on the WGNHS data viewer. Focus areas represented are: Midcontinent Rift mafic-ultramafic satellite intrusions, Paleoproterozoic weathering beneath mature quartzites, Upper Mississippi Valley Mineral District, Wolf River Batholith, and Upper Ordovician Phosphates.Focus areas are south of ceded territories except for the Midcontinent Rift mafic-ultramafic satellite intrusions, also know as the Round Lake exploration, as this is the only known site of exploration for a critical mineral, vanadium, in Wisconsin. Borehole data for these 56 drillholes has also been created. The core represented in the photographs is a subset of the collection, Rock cores from Wisconsin – Critical Minerals (Earth MRI).
