| Basis for focus area |
Barite occurrences and production within limestone replacement deposits within the Eastern Hayfork Subterrane. |
| Identified resources |
Historical production of barite. |
| Production |
Glidden deposits (1962-1964): ~30,000 tons barite; Alwood deposit (1962): 100-10,000 tons barite. |
| Status |
Past mining; no current mining or exploration. |
| Estimated resources |
Unknown. |
| Geologic maps |
Jennings and others (1977), scale 1:750,000; California Geological Survey Regional Geologic Maps and Geologic Atlas of California, scale 1:250:000. |
| Geophysical data |
Inadequate Rank 2, 3, and 5 aeromagnetic and aeroradiometric coverage. |
| Favorable rocks and structures |
Limestone beds within the Eastern Hayfork Subterrane and age equivalents. |
| Deposits |
Glidden (Loftus) (MRDS dep_id: 10077526), Alwood mine (MRDS dep_id: 10077850). |
| Evidence from mineral occurrences |
MRDS. |
| Geochemical evidence |
Geochemistry from the Almanor and Glidden Ba deposits (see Wigglesworth, 1984). |
| Geophysical evidence |
None. |
| Evidence from other sources |
None. |
| Cover thickness and description |
Bedrock exposure at the surface. |
| Authors |
Catherine Wesoloski. |
| New data needs |
Updated geologic mapping, lidar, geochemistry, aeromagnetic and aeroradiometric surveys. |
| Geologic mapping and modeling needs |
1:24,000 scale geologic mapping. |
| Geophysical survey and modeling needs |
Inadequate Rank 5 airborne magnetic and aeroradiometric coverage. High resolution, Rank 1 aeromagnetic surveys would be useful in delineating serpentine, ultramafics, but unclear if a new geophysical survey would be effective for barite deposits. |
| Digital elevation data needs |
Lidar inadequate. |
