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California · Nevada County

Lotzen Ranch

Unconfirmed Copper Underground

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Key facts

State
California
County
Nevada
Mining district
Spenceville
Development status
Occurrence
Mine type
Underground
Primary commodity
Copper
Verification
Unconfirmed

Mine Location

Approximate Area

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Documented underground workings

Mindat locality description

A Cu occurrence/prospect located in sec. 2, T14N, R7E, MDM, about 8.6 km ESE of Spenceville, SSE of Iron Mountain (10 miles SW of Grass Valley), possibly on military reservation land. Owned/operated by William Lotzen (1908- ). MRDS database stated acc…

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: 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.

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History & operations

Historical record

  • Development status: Occurrence

Operators / organizations

  • Lotzen, William · Historical operator

Commodities & minerals

Reported minerals

  • Quartz
  • Bornite
  • Chalcopyrite
  • Pyrite
  • Bornite
  • Chalcopyrite
  • Cuprite
  • Limonite
View all 10 reported minerals
  • Quartz
  • Bornite
  • Chalcopyrite
  • Pyrite
  • Bornite
  • Chalcopyrite
  • Cuprite
  • Limonite
  • Pyrite
  • Quartz

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: 84351

Supports:

  • locality identity
  • reported minerals (6)

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

View on Mindat

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