Masonic District

Past ProducerGold, SilverSurface-UndergroundUSGS MRDS

Location

StateCalifornia
CountyMono
Coordinates38.35750, -119.12444

Commodities

PrimaryGold, Silver
TertiaryCopper, Lead, Mercury, Arsenic, Antimony, Bismuth

Mine Details

StatusPast Producer
TypeSurface-Underground
Deposit TypeHydrothermal stringer zones, breccia filling, or "ledges"
Discovery Year1902
Data SourceUSGS MRDS
Source ID10310709

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.

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