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California · San Bernardino County

Puertas Negras Mine

Unconfirmed Arsenic Mixed Underground / Surface

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Key facts

State
California
County
San Bernardino
Development status
Producer
Mine type
Mixed underground / surface
Primary commodity
Arsenic
Verification
Unconfirmed

Mine Location

Approximate Area

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Documented underground workings

Mindat locality description

An As occurrence/mine located in sec. 24, T11N, R1E, SBM, about 11.2 km NNE of Calico, along the NE margin of the Calico Hills. MRDS database stated accuracy for this location is 100 meters. Local rocks include Paleozoic marine rocks, undivided, uni…

View full locality record on Mindat

Historical mapped workings

USGS historical topographic mapping. Features may no longer exist.

  • 2 shaft symbols
  • 1 adit symbol
View individual source records (2)

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

  • Derived from MRDS oper_type (existing operation): Surface-Underground
  • MRDS oper_type documents existing underground operation (dev_stat=Producer): Surface-Underground · oper_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: Producer

Commodities & minerals

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

USGS Historical Topographic Mine Features

Type: Historical mapped physical features

Dataset: DOI 10.5066/P9TAALR6

Supports:

  • mapped shaft symbols (2)
  • mapped adit symbols (1)

Historical mapped features may no longer exist.

Dataset information

Mindat

Type: Mineralogical locality database

Record: Mindat Locality: 89294

Supports:

  • locality identity

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

View on Mindat