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Margaret

Prospect in Skamania county in Washington, United States with commodities Copper, Molybdenum, Gold, Silver, Lead, Zinc, Arsenic
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Geologic information

Identification information

Deposit ID 10097315
MRDS ID M700154
Record type Deposit
Current site name Margaret
Included sites Earl Group, Earl Nos. 1-13, Samson Group, Germania, Golconda, Polar Star Group (1-11)

Geographic coordinates

Geographic coordinates: -122.08202, 46.3562 (WGS84)
Elevation 1044
Relative position 1 MI NORTHWEST OF RYAN LAKE
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Geographic areas

Country State County
United States Washington Skamania

Public Land Survey System information

Meridian Township Range Section Fraction State
Willamette 010N 006E 08,17 S2 (08); N2 (17) Washington

Comments on the location information

  • ON SOUTH SLOPE OF GOAT MOUNTAIN NEAR NORTH EDGE OF BLAST ZONE FROM 1980 MOUNT ST. HELENS ERUPTION. SITE MAY BE BURIED UNDER DEBRIS FROM THE MAY 18, 1980 ERUPTION OF MOUNT ST. HELENS. PROPERTY CONSISTS OF 13 PATENTED CLAIMS.
  • The outline of the Margaret Mine project of Duval is shown on p. 20, Figure 11 (Moen, 1977). The project includes parts of sections 7, 8, 9, 16-20, T. 10 N. R. 8 E. and a very small part of sections 12 and 13, T. 10 N. R. 5. E, Willamette Meridian.

Commodities

Commodity Importance
Copper Primary
Molybdenum Primary
Gold Secondary
Silver Secondary
Lead Tertiary
Zinc Tertiary
Arsenic Tertiary

Materials information

Materials Type of material
Bornite Ore
Chalcocite Ore
Chalcopyrite Ore
Chrysocolla Ore
Copper Ore
Covellite Ore
Galena Ore
Magnetite Ore
Malachite Ore
Molybdenite Ore
Pyrite Ore
Sphalerite Ore
Biotite Gangue
Calcite Gangue
Chlorite Gangue
Epidote Gangue
Goethite Gangue
Hematite Gangue
Kaolinite Gangue
Limonite Gangue
Quartz Gangue
Sericite Gangue
Tourmaline Gangue

Alteration

  • (Local) Potassic, Phyllic, Argillic, Propylitic Outward. Propylitic Can Overprint Phyllic Zone

Analytical data

Result SEE RESERVE ESTIMATES FOR GRADE INFORMATION

Mineral occurrence model information

Model code 78
USGS model code 20c
Deposit model name Porphyry Cu-Au
Mark3 model number 34
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 Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock unit name Spirit Lake Pluton, Main Phase
    Rock description Spirit Lake Pluton, Main Phase;;
    Stratigraphic age (youngest) Miocene
    Stratigraphic age (youngest) Miocene
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Quartz Diorite
    Rock unit name Spirit Lake Pluton, Main Phase
    Rock description Spirit Lake Pluton, Main Phase
    Stratigraphic age (youngest) Miocene

Nearby scientific data

(1) -122.08202, 46.3562
ListMap

Ore body information

  • General form STOCKWORK, DISSEMINATED
    Width 914.4M
    Length 1524M

Controls for ore emplacement

  • Brecciation Of Host Rocks

Comments on the geologic information

  • From Derkey and others, 1990, p. 338) The Spirit Lake pluton was emplaced along a series of north-trending Tertiary dikes, plugs, and plutons. The pluton is also on the southwest extension of a pronounced topographic linear that extends from Bumping Lake through Packwood. The Margaret deposit is a classic porphyry copper deposit emplaced in quartz diorite of the Spirit Lake pluton. The quartz diorite was dated by K-Ar methods at 20.6-22 m.y. The deposit is located near the contact of a quartz monzonite phase of the Spirit Lake pluton. Fracture systems, stockworks, and veinlets have localized the deposit. Brecciation is minor. The Margaret deposit exhibits concentric patterns of alteration and mineralization. There is a low-grade core of potassic-alteration surrounded by a phyllic-altered copper-molybdenum zone, then a phyllic-altered copper zone, and then an outer zone of propylitic-alteration. The phyllic-altered copper zone contains tourmaline bearing veinlets and breccia.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name St. Helens District - Ryan Lake Area

Mineral rights holdings

Type of mineral rights Patented
Type of mineral rights Located Claim

Land status

Ownership category National Forest
Area name In Gifford Pinchot National Forest

Ownership information

  • Type Operator
    Owner Teck Exploration, Inc.
    First year 1992

Comments on the production information

  • NOT PRODUCING. TENOR PROBABLY OVERRATED BY OWNERS. GALLAGHER THINKS AVERAGE IS 1 KG/T, AND RANGE IS 1/2 - 5 KG/T.

Comments on the reserve resource information

  • TOTAL AMOUNT OF POTENTIAL ORE IS 750 MILLION TONS TO DEPTH OF 1,000 FT WITH 0.6% EQUIVALENT CU.
  • From Derkey and others (1990, p. 338) The deposit is 3,000 ft wide, 5,000 ft long, and open at depth. Proven and probable reserves have been calculated at 577 million tons grading 0.36% Cu, 0.011% Mo, 0.007 oz/ton Au, and 0.046 oz/ton Ag. For a proposed 82,000 ton/per day operation, the overall stripping ratio would be 1:1.8. The higher grade portion contains drill-indicated reserves of 221 million tons at 0.434% Cu, 0.015% Mo, 0.008 oz/ton Au, and 0.056 oz/ton Ag. A smaller scale operation was also considered; it would use open pit and block caving methods. Average ore grade would be 0.9% Cu for this 16,000 ton/per day operation. The total amount of potential ore is 750 million tons to a depth of 1,000 ft, which contains 0.6% equivalent Cu.

Workings at the site

  • Type of workings Underground
    Length 309.37M

Comments on the workings information

  • 8 ADIT,S 20-475 FT LONG - MOST ADITS CAVED AT PORTALS
  • From Derkey and others (1990, p. 338) Adits were driven on the property in about 1900. No work had been done on the property until Duval Corporation acquired the claims in 1969. The deposit has been outlined by 105 diamond drill holes totalling 68,010 ft. The drilling was conducted by Duval Corp. from 1969 through 1979. In 1980 the Margaret property consisted of the Earl (Samson), Index, and Germania group of patented claims (36 total), as well as 237 unpatented Duval claims. The Margaret property is within the Mount St. Helens National Volcanic Monument.

Comments on development

  • INITIAL EXPLORATION WORK DONE BETWEEN 1900 AND 1904 BY MOUNT ST. HELENS CONSOLIDATED MINING CO. IN 1979, THE DUVAL CORP WAS DEVELOPING PROPERTY AS PART OF ITS MARGARET MINE PROJECT. IT DRILLED 105 HOLES TOTALING 68,010 FT. TECK EXPLORATION APPLIED FOR PROSPECTING PERMIT IN 1992

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS M700154
U.S. Bureau of Mines Minerals Availability System MAS 0530590054 Called Goat Mountain
U.S. Bureau of Mines Minerals Availability System MAS 0530590170 Called Margaret
USGS Mineral Resources Data System MRDS M700154
U.S. Bureau of Mines Minerals Availability System MAS 0530590084 Called Germania
USGS Mineral Resources Data System MRDS M700168 Called Germania
U.S. Bureau of Mines Minerals Availability System MAS 0530590071 Called Sampson
USGS Mineral Resources Data System MRDS SP00354

Bibliographic references

  • Deposit

    HOLLISTER, V.F., 1979, PORPHYRY COPPER-TYPE DEPOSITS OF THE CASCADE VOLCANIC ARC, WASHINGTON: MINERALS SCIENCE AND ENGINEERING, V. 11, P. 23-25.

  • Geology

    Phillips, W. M., compiler, 1987, Geologic map of the Mount St. Helens quadrangle, Washington and Oregon: Washington Division of Geology and Earth Resources Open File Report 87-4, 59 p., 1 plate.

  • Deposit

    HUNTTING, M.T., 1956, INVENTORY OF WASHINGTON MINERALS - PART II, METALLIC MINERALS: WASHINGTON DIVISION OF MINES AND GEOLOGY BULLETIN 37, V. 1, P. 78.

  • Deposit

    LANDES, HENRY, THYNG, W.S., LYON, D.A., AND ROBERTS, MILNOR, 1902, THE METALLIFEROUS RESOURCES OF WASHINGTON, EXCEPT IRON: WASHINGTON GEOLOGICAL SURVEY ANNUAL REPORT FOR 1901, V.I, PT. 2, P. 134.

  • Deposit

    MOEN, W.S., 1977, ST. HELENS AND WASHOUGAL MINING DISTRICTS OF THE SOUTHERN CASCADES OF WASHINGTON: WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES INFORMATION CIRCULAR 60, P. 17, 25.

  • Deposit

    MCFARLAND, C.R., MCLUCAS, G.B., RIGBY, J.R, AND STOFFEL, K.L., 1980, DIRECTORY OF WASHINGTON MINING OPERATIONS, 1979: WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES INFORMATION CURCULAR 69, P. 9.

  • Deposit

    DERKEY, R.E., JOSEPH, N.L., AND LASMANIS, RAYMOND, 1991, METAL MINES OF WASHINGTON - PRELIMINARY REPORT: WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES OPEN-FILE REPORT 90-18, P. 338-339.

  • Deposit

    DERKEY, R.E., GULICK, C.W., AND LINGLEY, W.S., JR., 1993, WASHINGTON'S MINERAL INDUSTRY - 1992: WASHINGTON GEOLOGY, V. 21, NO. 1, P. 3-25.

  • Reserve-Resource

    DERKEY AND OTHERS (1990) CITING DUVAL DATA

General comments

Subject category Comment text
Deposit POSSIBLY A MINERALIZED FAULT GOUGE
Deposit U.S. Bureau of Mines Minerals Availability Staff did a PEFR evaluation of this property in 1980.
Deposit MOST MINERALIZATION CONFINED TO CLOSELY SPACED FRACTURES THAT FORM STOCKWORKS. ORE GRADES ARE MOSTLY IN OUTER POTASSIC AND INNER PHYLLIC ZONE. DEPOSIT SHOWS CONCENTRIC ALTERATION AND MINERALIZATION PATTERNS

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1981 Caress, Mary E. (Evarts, Russ) U.S. Geological Survey
Updater 01-SEP-1991 Peterson, Jocelyn A. U.S. Geological Survey
Updater 19-MAY-2009 Causey, J. Douglas U.S. Geological Survey
Reporter 03-OCT-1990 Lasmanis, Raymond Washington Division of Geology and Earth Resources
Reporter 01-FEB-1991 Berger, Mary A. U.S. Geological Survey
Reporter 20-APR-1995 Hughes, Curt A. U.S. Bureau of Mines