Allard Stock

Occurrence in La Plata county in Colorado, United States with commodities Copper, Gold, Silver, PGE, Lead

Geologic information

Identification information

Deposit ID 10264283
MRDS ID D010798
MAS/MILS ID 0080670019
Record type Deposit
Current site name Allard Stock
Alternate or previous names Gail, North Star, Morning Star, Bright Star, Offset Nos. 1-2, Northerner, Northwesterner, Minnie, Protection, Flaussie Nos. 1-3, Audrey Nos. 1-2, Prize, Chance Nos. 1-2, Unpatented Claims: Copper Hill, Jane Nos. 1-4, Bill, Beverly, Herb, Jeanie, Larry, Punkey, Skippy, Willie, Willow Springs, Esmerelda, Hill Nos. 1-3, Jean, Ute, Ruby Nos. 1-95, Shorty Nos. 1-4, Pinky Nos. 1-2, Madden No. 1, Hazel Nos. 1-2, Sandra, Marge Nos. 1-2

Comments on the site names

  • ABW changed name from Allard to Allard Stock to better align with Long's Significant Deposits database.

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -108.08895, 37.40671 (WGS84)
Elevation 3115
Location accuracy 10(meters)
(click for info)

Geographic areas

Country State County
United States Colorado La Plata

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 036N 011W 05 NE Colorado

Comments on the location information

  • (Land Status And Administrative Area Locations Calculated Using Gis Overlay Analysis For San Juan N. F.). On West Side Of Stream Near Headwaters Of Bedrock Creek, 1.45 Miles Nw Of La Plata Townsite (Unsurveyed Section). ; Info From Land.St :1974


Commodity Importance
Copper Primary
Gold Tertiary
Silver Tertiary
PGE Tertiary
Lead Tertiary

Materials information

Materials Type of material
Galena Ore
Pyrite Ore
Augite Gangue
Calcite Gangue
Chrysocolla Gangue
Fluorite Gangue
Limonite Gangue
Magnetite Gangue
Malachite Gangue
Quartz Gangue


  • (Local) Oxidation

Analytical data

Result SAMPLE 2 (FROM 200 TO 580 FT), 0.543% CU, 0.23 OZ/TON AG, 0.003 OZ/TON PT
Result SAMPLE 3 (FROM 580 TO 740 FT), 0.192% CU, 0.24 OZ/TON AG
Result SAMPLE 4 (WEST DRIFT ALONG 212 FT), 0.486% CU, 0.22 OZ/TON AG.

Mineral occurrence model information

Model code 53
USGS model code 17
Deposit model name Porphyry Cu
Mark3 model number 4

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Syenite
    Rock unit name Nonporphyritic Rocks--Syenite
    Stratigraphic age (youngest) Eocene

Nearby scientific data

Main Entrance (1) -108.08895, 37.40671

Geologic structures

Type Description Terms
Regional San Juan Uplift, Four Corners Platform
Local La Plata Dome, Syenite Stock

Ore body information

  • Field Value
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 TABULAR
    Primary mode of Origin HYDROTHERMAL
    Date of Last Modification 920528

Controls for ore emplacement

  • East- To Ne-Trending Augite/Orthoclase Dikes; Quartz Veins:

Economic information

Economic information about the deposit and operations

Operation type Underground
Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant Yes
Discovery method Ore-Mineral In Place

Mining district

District name California (La Plata) District

Land status

Ownership category National Forest
Area name San Juan N. F.

Ownership information

  • Type Operator
    Owner Humble Oil Co.
    Home office Durango, Co.
    First year 1968
  • Type Owner
    Owner Harry Rowe
    Home office Hesperus, Co.
    First year 1968

Comments on the workings information

  • One Tunnel Driven Initially S 55 W For 20 Ft, Thence N 35 W For 370 Ft To Face; 100-Ft Sw- And Nw-Branching Tunnel At 255 Ft From Portal.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
U.S. Bureau of Mines Minerals Availability System MAS 0080670019
USGS Mineral Resources Data System MRDS D010798 MAS references MRDS

Bibliographic references

  • Deposit

    Ref: Cbm Annual Report 1968, Topo Map

  • Deposit

    Own/Op: Humble Oil Co. 1968

  • Deposit

    Bom Openfile Rpt MLA 2-92

  • Deposit

    Schwartz, G.M., And Others, 1949, Disseminated Chalcopyrite With Platinum And Palladium, In Eckel, E.B., And Others, Geology And Ore Deposits Of The La Plata District, Colorado: USGS Prof. Paper 219, P. 63-65, 84-85.

  • Deposit

    Eckel, E.B., 1938, Copper Ores Of The La Plata District, Colorado, And Their Platinum Content: Colorado Sci. Soc. Proc., V.13, No. 12, P. 647-664.

  • Deposit

    Colorado Div. Mines Inf. Rept.

General comments

Subject category Comment text
Deposit Pyrite And Chalcopyrite Sparsely Disseminated Through Syenite, Which Is Traversed By Numerous, Discontinous Dikes Of Augite And Orthoclase, By Quartz Veins Containing Chalcopyrite And Pyrite, And By Quartz-Flourite Veins Carrying Pyrite And Some Galena. Oxidation Of Sulfides Visible Throughout Area.

Reporter information

Type Date Name Affiliation Comment
Reporter 21-JUL-1992 Intermountain Field Operations Center (IFOC) U.S. Bureau of Mines
Editor 23-OCT-2008 Wilson, Anna B. U.S. Geological Survey
Reporter 01-AUG-1983 Schwochow, Stephen D. Colorado Geological Survey