California · Napa County

Fourth of July Claim

Unconfirmed Chromium Mixed Underground / Surface

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Key facts

State: California
County: Napa
Development status: Past Producer
Mine type: Mixed underground / surface
Primary commodity: Chromium
Verification: Unconfirmed

Mine Location

Approximate Area

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Documented underground workings

Mindat locality description

A Cr occurrence/claim located in sec. 18, T10N, R5W, MDM, 7.5 km (4.6 miles) NNE of Aetna Springs. Operated by Mr. Frank Rhoda. Workings included an open cut. Production was some 15 tons of ore.

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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=Past 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.

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History & operations

Historical record

Development status: Past Producer

Commodities & minerals

Chromium · primary

Reported minerals

Chromite

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: 83660