Mineral Exploration Document Areas - Lehmann Family Fund Collection

Spatial (GIS) footprints that connect to more than 2,000 scanned mineral exploration documents from the Lehmann Family Fund Collection (including the Polaris Joint Venture). The GIS polygon data includes URL links to view or download the document(s) for a mineral exploration area. Please read the lineage and accuracy sections of this form for details on GIS data creation and accuracy. <br/><br/>For information on the Lehmann Exploration Collection inventory please visit the DNR's webpage at:<br/>http://www.dnr.state.mn.us/lands_minerals/polaris/index.html

Additional Info

Field Value
dsAccessConst None
dsMetadataUrl https://resources.gisdata.mn.gov/pub/gdrs/data/pub/us_mn_state_dnr/geos_mineral_exp_docs_lehmann/metadata/metadata.html
dsModifiedDate 2022-09-01 02:05:15
dsOriginator Minnesota Department of Natural Resources (DNR) - Lands and Minerals Division
dsPurpose The Lands and Minerals Division's goal for the Lehmann Family collection is to protect and preserve the original documents while making them readily accessible to the public via the internet and in GIS. There are now approximately 20,000 individual pages available from this collection comprised of 2,056 documents. The documents include reports, maps, and raw data; nearly all have been scanned and are available online. Certain documents are only available to view at the Hibbing Lands and Minerals office due to logistical constraints of scanning very large and fragile documents or documents in unusual formats. The Lehmann Family Fund donated $10,000 to preserve and catalog these documents.

Users may search through the online documents through the GIS data provided, an associated excel spreadsheet, as well as in a web map.

About the Collection:
A generous gift from the Lehmann Family Fund has made historical mineral exploration data available and accessible to the public and to the industry. The donation honors the lifelong work of Ernie Lehmann, an internationally-renowned mineral explorer who was a pioneer in evaluating the mineral resource potential of Minnesota's greenstone belts and Duluth Complex.

The Polaris Joint Venture (PJV) was a large-scale five year-long exploration campaign that targeted high-grade Copper-Zinc prospects in the greenstone belts of Northern Minnesota during the early 1980's. Ernest K. Lehmann & Associates (ELA), in partnership with Getty and Billiton, completed airborne and ground geophysical surveys, geologic mapping, geochemical sampling, and 50 drill holes within a 13,000 square mile study area that stretched roughly from Bemidji to Ely. This new data will accompany the drill core samples already deposited at the DNR's drill core library located in Hibbing, Minnesota.

Largely funded by private industry, historical mineral exploration records are the primary source of information about the buried, undiscovered, and undeveloped mineral deposits in the state. The records represent a significant investment of time, capital and human effort to discover and map the state's minerals.

In addition to mineral exploration, the use of the geoscience information contained in the records by state agency geologists will inform state land administration and groundwater planning decisions as well as university researchers to further discover the geologic history of the state.

gdrsDsGuid {f1f0e3e8-6ea7-4f2a-935f-db088fe31e0d}
spatial {"type":"Polygon","coordinates":[[[-95.72, 45.72],[-95.72, 48.64], [-91.40, 48.64], [-91.40, 45.72], [-95.72, 45.72]]]}

Dataset extent

Map data © OpenStreetMap contributors