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California · Sonoma County

Last Chance and Young Denver

Unconfirmed Mercury Mixed Underground / Surface

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Key facts

State
California
County
Sonoma
Mining district
West Mayacmas
Development status
Past Producer
Mine type
Mixed underground / surface
Primary commodity
Mercury
Verification
Unconfirmed

Mine Location

Approximate Area

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Documented underground workings

Mindat locality description

A former Hg mine located 5.0 km (3.1 miles) SW of Castle Rock Springs. Mineralization is hosted in serpentinite. Local structures include a serpentine-sandstone contact.

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.

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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
  • Cinnabar

Access & recent conditions

Land
unknown

Community reports

No community field reports yet.

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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: 95713

Supports:

  • locality identity
  • reported minerals (1)

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

View on Mindat

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Historical mapped workings available