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Plumbago

Past Producer in Sierra county in California, United States with commodities Gold, Lead, Copper
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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. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Ore body information
  13. Economic information about the deposit and operations
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10086507
MRDS ID X025371
Record type Site
Current site name Plumbago
Alternate or previous names Croesus, Hope, Crafts Clute, Gold Beater, Standard, Standard Ext., Enterprise, Marion
Related records 10189886

Geographic coordinates

Geographic coordinates: -120.8127, 39.45267 (WGS84)
Elevation 1280
Relative position 2 MI SE OF ALLEGHANY

Site location context

Political divisions (FIPS codes)

Sierra(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Alleghany(quadrangle 1:24,000 scale)

Truckee(quadrangle 1:100,000 scale)

Chico(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Yuba(hydrologic unit)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Federal lands

Tahoe National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States California Sierra

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 018N 010E 01 California

Comments on the location information

  • UTM ACC. SW 1/4

Commodities

Commodity Importance
Gold Primary
Lead Tertiary
Copper Tertiary

Comments on the commodity information

  • HIGH GRADE ORE ASSOC. W COARSE ARSENOPYRITE. CONCENTRATES CONTAIN ENOUGH AU TO WARRANT BEING SAVED - AVE. $150/TON. HIGH GRADE ORE WHEREVER VEIN CARRIES MUCH QTZ.

Materials information

Materials Type of material
Gold Ore
Pyrite Ore
Quartz Gangue

Alteration

  • (Local) Carbonate

Mineral occurrence model information

Model code 273
USGS model code 36a
Deposit model name Low-sulfide Au-quartz vein
Mark3 model number 27
Model code 273
USGS model code 36a
Deposit model name Low-sulfide Au-quartz vein
Mark3 model number 27

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro
    Stratigraphic age (youngest) Late Permian
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro
  • Host or associated Host
    Rock type Metamorphic Rock > Schist
  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt

Nearby scientific data

(1) -120.8127, 39.45267
ListMap

Economic information

Ore body information

  • Strike N 49 W
    Dip 38 NE
    Thickness 9.14M

Comments on the geologic information

  • 2 - 4 FT AVE THICK QTZ VEIN W 1 LENS 30 FT THICK MOSTLY WELL DEFINED W HORNBLENDE SCHIST FOOTWALL & HANGING WALL OF LESS SCHISTOSE GABBRO THAN USUAL FOR THE AREA. BOTH WALLS WELL DEFINED & SEPERATED FROM QTZ BY CRUSHED, ALTERED GABBRO. CONSIDERABLE VARIATIONS IN BOTH STRIKE & DIP - ON 8 & 9 LEVELS ITS FLATTER DIP IS ASSOCIATED W GREAT INCREASE OF THICKNESS. SEVERAL SPLITS IN THE PARALLEL VEINS. QTZ CONTAINS GABBRO FRAGS EMBAYED BY QTZ SUGGESTING REPLACEMENT OF GABBRO; ELSEWHERE QTZ STRANDS W. DARK MINERAL LINES SUGGEST THRUSTING W/1 VEIN. REVERSE FAULT DISPLACES SCHIST. QTZ PINCHES OUT BEFORE MEETING SERP. VEIN CUT BUT NOT DISTORTED BY BASALT INTRUSION WHICH MAY HAVE REPLACED 60 - 150 FT OF QTZ. LATER QTZ VEINS TRANSVERSE TO MAJOR STRUCTURE, & ALONG HANGING WALL BRECCIATED WALL ROCK ALTERED TO CARBONATE MARIPOSITE & VEIN QTZ, CEMENTED BY FINE-GRAINED DARK QTZ. IN PLACES GABBRO CLOSE TO VEIN CONTAINS SML ARSENOPYRITE XTLS. VEIN ARSENOPYRITE IN LARGE BLADED CLUSTERS. ONLY PLACE IN
  • DISTRICT WHERE PALYGORSKITE IS FOUND - IN TOUGH FELT-LIKE SHEETS, AS FILLING OF SMALL, UP TO A FOOT, VEINS. POST MINERAL THRUSTS IN PLACES.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant Yes

Comments on the production information

  • FERGUSON ESTIMATES RETURN AT $86/FOOT OF WORKING IN LAST 20 YRS GRADE OF MILLROCK IS $8.40/TON. PRODUCTION OF A SMALL AMOUNT OF AU ORE REPORTED IN 1959.

Workings at the site

  • Type of workings Surface/Underground
    Overall depth 365.76M
    Overall length 609.6M

Comments on the workings information

  • 4 ADITS, NO 3 & NO 4 , 500 FT BELOW NO 3 , UNCAVED, RECENT WORK IN NO 4 EXTENDED TO NO 10 LEVEL, 800 FT DOWN DIP FROM NO 4 ADIT LEVEL. 20000 FT DRIFTS 9000 FT RAISES & WINZES.

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit VEINS

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1979 Hayden, F. (Albers, J.) U.S. Geological Survey

Beyond USGS

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

Current status (per MSHA)

StatusAbandoned since 05/09/2016
MSHA mine ID0403065
Mine name (MSHA)Plumbago Mine
Current operatorOriginal Sixteen to One Mine, Inc.
Current controller (parent)Michael M Miller
Mine typeUnderground (Metal / non-metal)

Inferred by coordinate + name similarity (173 m, 1.00 match). Confirm against MSHA if precision matters — non-USGS-curated cross-references may occasionally point at a neighbouring mine.

Open MSHA's Mine Data Retrieval System for inspections, accidents, and violations for this mine.

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.