Past ProducerManganeseSurface-UndergroundUSGS MRDS
Location
State
California
County
San Luis Obispo
Coordinates
35.66936, -121.15929
Commodities
Tertiary
Manganese
Mine Details
Status
Past Producer
Type
Surface-Underground
Discovery Year
1942
Data Source
USGS MRDS
Source ID
10237538
What This Means
This mine is a past producer — it was once operational but is no longer actively mining. Past producer sites may still have environmental impacts including disturbed land, tailings piles, and potential water quality effects. Some past producer sites have been reclaimed, while others remain as-is. Check with your state mining or environmental agency for current site conditions.