Helen | UndergroundMines

Key facts

State: California
County: Lake
Mining district: East Mayacmas
Development status: Past Producer
Mine type: Underground
Primary commodity: Mercury
Verification: Unconfirmed

Also known as

American, Dead Broke

Mine Location

Approximate Area

Open in Mine Map

Documented underground workings

Adit — documented in 2 source records.
USGS Historical Topographic Mine Features

Historical mapped workings

USGS historical topographic mapping. Features may no longer exist.

6 adit symbols

Adit : Mount St. Helena , 1959
Adit : Mount St. Helena , 1959

View individual source records (4)

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

Adit
Mapped on historical USGS topographic data (Adit). Historical map features may no longer exist in the field.
Adit
Mapped on historical USGS topographic data (Adit). Historical map features may no longer exist in the field.

USGS MRDS working type: Underground

MRDS work_type documents underground workings: 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

USGS source data documents underground workings for this record.

View sources & evidence

History & operations

Historical record

Development status: Past Producer

Operators / organizations

H. W. Gould Co. · Source-reported owner

Commodities & minerals

Mercury · primary

Reported minerals

Opal
Pyrite
Cinnabar
Mercury
Metacinnabar

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

USGS Historical Topographic Mine Features

Type: Historical mapped physical features

Dataset: DOI 10.5066/P9TAALR6

Supports:

mapped adit symbols (6)

Historical mapped features may no longer exist.

Dataset information

Related underground mines

Aetna

California · Napa County

Unconfirmed Mercury Past Producer Mixed Underground/Surface

Documented adit evidence

Aetna Extension