Black Wonder Sec.28 Group.

Past ProducerManganese, SilicaSurfaceUSGS MRDS

Location

StateCalifornia
CountySanta Clara
Coordinates37.38162, -121.43132

Commodities

TertiaryManganese, Silica

Mine Details

StatusPast Producer
TypeSurface
First Production1941
Discovery Year1940
Data SourceUSGS MRDS
Source ID10287050

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.

Other Mines in Santa Clara County

View all mines in Santa Clara County →

Other Manganese, Silica Mines in California

All manganese, silica mines in California →