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New Almaden Mine

Past Producer in Santa Clara county in California, United States with commodity Mercury
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Mineral rights holdings
  17. Ownership information
  18. Production statistics
  19. Workings at the site
  20. Links to other databases
  21. Bibliographic references
  22. General comments
  23. Reporter information

Geologic information

Identification information

Deposit ID 10040742
MRDS ID M055605
MAS/MILS ID 60850092
Record type Site
Current site name New Almaden Mine
Alternate or previous names New Almaden, Santa Clara, Chaboya
Included sites New Almaden District

Geographic coordinates

Point of reference Approximate
Geographic coordinates: -121.84167, 37.17944 (WGS84)
Elevation 305
Location accuracy 1000(meters)
Relative position 9 MI S OF SAN JOSE. Located near center of the many New Almaden workings. Coordinates for each individual working should be listed separately as subrecords to this record.

Site location context

Political divisions (FIPS codes)

Santa Clara(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Santa Teresa Hills(quadrangle 1:24,000 scale)

San Jose(quadrangle 1:100,000 scale)

San Jose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Coyote(hydrologic unit)

San Francisco Bay(hydrologic accounting unit)

San Francisco Bay(hydrologic subregion)

California(hydrologic region)

Federal lands

LG(Federal land areas administered by LG)

Geographic areas

Country State County
United States California Santa Clara

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 008S;009S 001E;001E 27,28,29,02,03,04 California

Comments on the location information

  • LOCATED ON VICTORIA SHAFT NEAR TOP OF MINE HILL

Commodities

Commodity Importance
Mercury Primary

Materials information

Materials Type of material
Cinnabar Ore
Metacinnabar Ore
Dolomite Gangue
Quartz Gangue
Bornite Unknown
Chalcopyrite Unknown
Galena Unknown
Sphalerite Unknown
Pyrite Unknown
Stibnite Unknown

Alteration

  • (Local) Silica Carbonate Alteration Of Serpentine

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite
    Rock unit name Franciscan Complex
    Rock description Franciscan Complex
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Pyroclastic Rock > Tuff

Nearby scientific data

Approximate (1) -121.84167, 37.17944
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Local Anticline, Tension Fractures
Type of structure Regional
Structure description Nw

Ore body information

  • General form IRREGULAR
    Depth to top 0M
    Depth to bottom 731.52M

Comments on the ore body information

  • Orebody info copied from deleted record 10189541 (MAS 0060850092) appears to have been a USBM Matrix model: Length 1000m, Width 100 m, depth to top 100 m, thickness 5 M, strike N55W, dip 45E. MAS Matrix # : 1 MAS Column # : 1 Type of Orebody #1 : REPLACEMENT Shape of Orebody #1 : IRREGULAR Type of Orebody #2 : FISSURE VEIN Shape of Orebody #2 : TABULAR Primary mode of Origin : HYDROTHERMAL Primary Ore Control : LITHOLOGY Secondary Ore Control : FRACTURING Degree of Wallrock Alter. : MODERATE Type of Wallrock Alter. #1 : CARBONITIZATION Strike And Dip : N55W:45E Minimum Depth to Top : 0 Avg. Thick. Unconsol. Mat. : 3 Min. Thick. Unconsol. Mat. : 0 Date of Last Modification : 820524 Orebody Name: Total Surface Area (HA) : 259 Date of Last Modification : 910418

Controls for ore emplacement

  • Serpentine - Tuff Contact, Fractures

Comments on the geologic information

  • ASSOCIATED WITH UPPER CRETACEOUS ROCKS OF SANTA TERESA HILLS

Economic information about the deposit and operations

Operation type Surface-Underground
Development status Past Producer
Commodity type Metallic
Deposit size Large
Significant No
Discovery year 1824
Year of first production 1845

Comments on exploration

  • 1951 DIREXPL DMEA, FOUND MINOR MINERALIZATION BUT NOT OF ECONOMIC SIGNIFICANCe.

Mining district

District name New Almaden District

Mineral rights holdings

Type of mineral rights Other

Ownership information

  • Type Owner
    Owner New Almaden Property Holders, Inc.
  • Type Owner
    Owner Santa Clara County
    Interest 100
    Home office Santa Clara County, CA
    Year 1981

Production statistics

  • Year 1962
    Period To 1962
    Material HG
    Accuracy Estimate
    Description Cp_Grade: ^2-20 Lb/Ton
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Mercury Mercury 4969g/mt

Comments on the production information

  • USBM UNPUB DATA

Comments on the reserve resource information

  • [From deleted record 10189541, MAS 0060850092]: MATRIX 1 COLUMN 1 EQUALS MATRIX 1 COLUMN 2 PLUS MATRIX 1 COLUMN 3, AND IS CUMMULATIVE. MATRIX 1 COLUMN 2 REPRESENTS IDENTIFIED RESOURCES IN THE SAN FRANCISCO AREA BELOW THE 400-LEVEL, AND IS NON- CUMMULATIVE. MATRIX 1 COLUMN 3 REPRESENTS IDENTIFIED RESOURCES IN THE MINE HILL AREA, AND IS NON-CUMMULATIVE. THE MATERIAL IS STOPE FILL.

Workings at the site

  • Type of workings Surface/Underground
    Length 53106.9M
    Overall depth 746.76M

Comments on the workings information

  • Seems to be a USBM hypothetical model: length 56,000 m, depth 200 m MAS Development Schedule #: 1 Mining Record # : 1 Status of Mining Method : ESTIMATE Mining Method : OPEN STOPE Swell Factor : .6 Percent Waste Rock : 0 Percent Recovery : 100 Hardness of Rock : HARDROCK FISSURED WITH MODERATE WATER Rock Characteristics : ONE SYSTEM OF WEAKNESS PLANES Rock Support Chars. : SUPPORTING MAY BACK SLAB Mine Support Chars. : TIMBER Number of Shafts : 22 Length of Inclines (m) : 200 Slope of Inclines : 60 Number of Inclines : 2 Avg. Length of Adits (m) : 300 Number of Adits : 99 1st Condition of Workings : OPEN 2nd Condition of Workings : CAVED AT PORTAL 3rd Condition of Workings : FLOODED Capacity : 64Capacity Units : MT ORE/DAY Unit Production Cost : 68.64 Units of Production : $/MT ORE Operating Days per Year : 250 Operating Shifts per Day : 1 Year of Information : 1982

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit [From deleted record 10189541]: THE NEW ALMADEN MINES INDLUDE FROM EAST TO WEST, THE NEW ALMADEN, AMERICA, PROVIDENCIA, ENRIQUITA, SAN ANTONIO, SAN MATEO, AND SENATOR MINES. THE MINES ARE CONTAINED IN 1,456 HECTARES LYING ALONG LOS CAPITANCILLOS RIDGE. THE PROPERTY WAS SOLD BY NEW IDRIA MINING AND CHEMICAL CO. TO SATA CLARA COUNTY IN 1975. THE AREA IS NOW THE ALMADEN QUICKSILVER PARK. PRODUCTION TO THE END OF 1976 WAS 38.09 MILLION KILO- GRAMS (1,104,922 FLASKS) OF MERCURY FROM 1,722,900 TONNES OF ORE. THE AVERAGE FIVE YEAR ANNUAL GRADE WAS 5.40% AND THE CUMMULATIVE GRADE WAS 2.21%. THIS IS LESS THAN 57 T/D ASSUMING A 250 DAY OPERATING YEAR FOR THE 121 PRODUCING YEARS. THERE ARE NO RESERVES AND IDENTIFIED RESOURCES ARE INSIGNIFICANT. ESTIMATES OF HYPOTHETICAL RESOURCES RANGE FROM 100,000 TO 1,000,000 FLASKS OF MERCURY. WATER AND ELECTRICAL POWER ARE AVAILABLE AT THE SITE, OR WITHIN 5 KILOMETERS (KM). THE PRESENT ACCESS ROAD IS ADEQUATE.

Reporter information

Type Date Name Affiliation Comment
Reporter 1976-07-01 Peterson, Jocelyn A. U.S. Geological Survey
Reporter 1976-01-01 Weeks, Robert U.S. Geological Survey W017645 = 10072388.
Reporter 1979-07-01 Unknown U.S. Geological Survey W025130 = 10111050.
Reporter 1994-04-28 Lindsey, David S. U.S. Geological Survey 0060850092 = newMRDS 10189541
Editor 2010-11-09 Wilson, Anna B. U.S. Geological Survey Merged and deleted 3 duplicate records: 0060850092 = newMRDS 10189541 W025130 = 10111050. W017645 = 10072388,

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

External references

Maps centered on this site

Authoritative California resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.