Safety: Historic mine sites can be hazardous. Never enter abandoned workings without qualified supervision. Read full notice
UndergroundMines
Search Sign in Join Free

California · San Luis Obispo County

Madrone

Unconfirmed Mercury Mixed Underground / Surface

Save Mine I Visited Verify Flag Add to Trip

Key facts

State
California
County
San Luis Obispo
Mining district
Adelaide
Development status
Past Producer
Mine type
Mixed underground / surface
Primary commodity
Mercury
Verification
Unconfirmed

Mine Location

Approximate Area

Open in Mine Map

Documented underground workings

Mindat locality description

A former Hg mine located in secs. 17, 21, and 22, T27S, R10E (MD), 8.4 km (5.2 miles) S of Adelaida. Mineralization is hosted in serpentinite. Structures include local fractures. Production data are found in: U.S. Bureau of Mines file data.

View full locality record on Mindat

View individual source records (2)

Every underlying record used to build the summary above, for research/verification use.

  • USGS MRDS working type: Surface/Underground
  • MRDS work_type documents underground workings: Surface/Underground · work_type

Verification

Unconfirmed

Source records support underground workings, but UndergroundMines has not yet independently verified this mine.

Verify Mine Flag Mine

Why it's listed

Source records document both underground and surface mining.

View sources & evidence

History & operations

Historical record

  • Development status: Past Producer

Commodities & minerals

Reported minerals

  • Cinnabar
  • Mercury
  • Cinnabar
  • Native Mercury

Access & recent conditions

Land
unknown

Community reports

No community field reports yet.

I Visited This Mine

Sources & evidence

USGS Mineral Resources Data System

Type: Historical mine record

Supports:

  • mine identity
  • development status
  • commodities
  • underground eligibility evidence

Mindat

Type: Mineralogical locality database

Record: Mindat Locality: 91890

Supports:

  • locality identity
  • reported minerals (2)

A Mindat locality match does not by itself establish underground workings.

View on Mindat

Related underground mines

La Libertad

California · San Luis Obispo County

Unconfirmed Mercury Producer Underground

Klau Mine

California · San Luis Obispo County

Unconfirmed Mercury Past Producer Mixed Underground/Surface

Documented adit evidence

Mahoney

California · San Luis Obispo County

Unconfirmed Mercury Producer Mixed Underground/Surface

Historical mapped workings available

Cambria

California · San Luis Obispo County

Unconfirmed Mercury Past Producer Underground