Past ProducerManganese, SilicaUndergroundUSGS MRDS
Location
State
California
County
Alameda
Coordinates
37.60351, -121.65413
Commodities
Tertiary
Manganese, Silica
Mine Details
Status
Past Producer
Type
Underground
First Production
1888
Discovery Year
1886
Data Source
USGS MRDS
Source ID
10162994
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.