USGS Mineral Resources Data System
Type: Historical mine record
Supports:
- mine identity
- development status
- commodities
- underground eligibility evidence
California · Santa Clara County
New Almaden Mine
Unconfirmed Mercury Mixed Underground / Surface
Key facts
- State
- California
- County
- Santa Clara
- Development status
- Past Producer
- Mine type
- Mixed underground / surface
- Primary commodity
- Mercury
- Verification
- Unconfirmed
Also known as
- Chaboya, Santa Clara, New Almaden District, Cora Blanca, San Francisco, South Randol, North Randol, Victoria, Central Stope, Velasco, HarryNew Almaden, San Pedro - Almaden., Santa Mariana
Mine Location
Approximate AreaDocumented underground workings
Source classification: Underground operation documented
Specific physical workings are not yet documented in discrete records.
Historical mapped workings
USGS historical topographic mapping. Features may no longer exist.
- 9 shaft symbols
- 6 adit symbols
View individual source records (3)
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
- 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.
Why it's listed
Source records document both underground and surface mining.
History & operations
Historical record
- Development status: Past Producer
Operators / organizations
- New Almaden Property Holders, Inc. · Source-reported owner
Commodities & minerals
Reported minerals
- Dolomite
- Quartz
- Cinnabar
- Metacinnabar
- Bornite
- Chalcopyrite
- Galena
- Pyrite
View all 10 reported minerals
- Dolomite
- Quartz
- Cinnabar
- Metacinnabar
- Bornite
- Chalcopyrite
- Galena
- Pyrite
- Sphalerite
- Stibnite
Photos
Wikimedia Commons
Access & recent conditions
- Land
- public land
- Source
- Santa Clara County Parks
- Access information last checked
- August 9, 2026
Community reports
Sources & evidence
USGS Historical Topographic Mine Features
Type: Historical mapped physical features
Dataset: DOI 10.5066/P9TAALR6
Supports:
- mapped shaft symbols (9)
- mapped adit symbols (6)
Historical mapped features may no longer exist.
Santa Clara County Parks
Type: Access / land-management source
Supports:
- access / lawful visit information
Approved historical / mine photographs
Type: Image sources
Record: 1 approved photograph
Supports:
- visual documentation
Related underground mines
Bernal
California · Santa Clara County
Unconfirmed Mercury Past Producer Underground
Documented shaft/adit evidence
Chaboya - Hillsdale
California · Santa Clara County
Unconfirmed Mercury Past Producer Mixed Underground/Surface
Historical mapped workings available
American
California · Santa Clara County
Unconfirmed Mercury Past Producer Mixed Underground/Surface
Historical mapped workings available
Enriquita
California · Santa Clara County
Unconfirmed Mercury Past Producer Mixed Underground/Surface
Historical mapped workings available