| Basis for focus area |
Epigenetic carbonate-hosted lead-zinc enrichment in stratabound zones hosted by Cambrian Shady Dolomite at Austinville-Ivanhoe district, and similar style of mineralization in stratiform breccia and replacement deposits at the Timberville district in Ordovician Beekmantown Formation in the northern Shenandoah Valley. |
| Identified resources |
Identified resources and historical production of lead and zinc. |
| Production |
Overall production from Austinville and Ivanhoe estimated at 34 million tons of Pb-Zn concentrate from ore averaging 4.7% combined Pb-Zn. |
| Status |
Past mining. Current mining at Austinville produces agricultural lime from historical mine tailings. |
| Estimated resources |
At the time of closure in 1981, New Jersey Zinc Corp estimated remaining mineable ore reserves of about 900,000 tons. |
| Geologic maps |
Austinville-Ivanhoe area: unpublished New Jersey Zinc Corp mine maps; Virginia Division of Mineral Resources (1993), scale 1:500,000; Timberville area: Heller and others (2014), scale 1:24,000; Heller and others (2018), scale 1:24,000; Stephenson (1949, plate 1), scale unknown. |
| Geophysical data |
Inadequate aeromagnetic and aeroradiometric data. |
| Favorable rocks and structures |
Austinville-Ivanhoe district: Cambrian Shady Dolomite; Timberville district: Ordovician Beekmantown Formation. |
| Deposits |
Austinville-Ivanhoe district; Austinville East mine (MRDS dep_id: 10088538), Austinville Flatwood mine (MRDS dep_id: 10067278); Timberville district: Bowers-Campbell mine (MRDS dep_id: 10111261). |
| Evidence from mineral occurrences |
MRDS; Virginia Dept. Energy Economic Geology Files. |
| Geochemical evidence |
See Good and Allen (1972). |
| Geophysical evidence |
Unknown. |
| Evidence from other sources |
Geologic mapping. |
| Comments |
Despite their locations in different stratigraphic unites, the various occurrences of Appalachian MVT deposits have many similarities (Appold and others, 1995). |
| Cover thickness and description |
Exposed bedrock to thin cover. |
| Authors |
William L. Lassetter. |
| New data needs |
Geochemical sampling for a comprehensive suite of metals to assess potential critical commodities that have been overlooked in the past. Mine waste materials may be of particular interest. Also geologic mapping in selected areas. |
| Geologic mapping and modeling needs |
1:24,000 scale geologic mapping. |
| Geophysical survey and modeling needs |
Not requested at this time. |
| Digital elevation data needs |
Lidar complete. |
