Prospect in Alaska, United States with commodities Silver, Gold, Copper, Arsenic, Lead, Antimony, Zinc

Geologic information

Identification information

Deposit ID 10000694
MRDS ID A011323
Record type Site
Current site name Mayflower

Geographic coordinates

Geographic coordinates: -149.64589, 63.21569 (WGS84)
Relative position The Mayflower prospect is at an elevation of about 3,400 feet, on the west side of Bryn Mawr Creek. It is in the NW1/4 of sec. 3, T. 20 S., R. 11 W., of the Fairbanks Meridian. The location is accurate to within 400 feet.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Silver Primary
Gold Primary
Copper Primary
Arsenic Secondary
Lead Secondary
Antimony Secondary
Zinc Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Chalcopyrite Ore
Galena Ore
Gold Ore
Pyrite Ore
Pyrrhotite Ore
Sphalerite Ore
Stibnite Ore
Ankerite Gangue
Quartz Gangue


  • (Local) Alteration consists of a combination of skarn (epidote, garnet and actinolite), silica flooding, ankerite, pyrite and sericite. Limonite and uncommon chalcocite are oxidation and supergene mineral assemblages.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46
Model code 78
USGS model code 20c
Deposit model name Porphyry Cu-Au
Mark3 model number 34
Model code 59
USGS model code 18b
Deposit model name Skarn Cu
Mark3 model number 8

Host and associated rocks

  • Host or associated Host
    Chronological age 67.5
    Uncertainty 2.5
    Stratigraphic age (youngest) Late Cretaceous

Nearby scientific data

(1) -149.64589, 63.21569

Comments on the geologic information

  • Geologic Description = The country rocks in the area of the Mayflower prospect include Devonian to Triassic clastic, carbonate, volcanic, and volcaniclastic strata, which are intruded by a plug and dikes of Upper Cretaceous (70-65 Ma) quartz diorite porphyry (Swainbank and others, 1977). The Mayflower prospect is associated with a dikelike extension of the intrusive plug at the Golden Zone mine (HE043). Major faults trend northeast-southwest and have imparted a strong northeast-trending fabric to the host rocks. These faults have controlled the emplacement of intrusive rocks. At the Mayflower there is evidence that northwest-trending faults predated intrusion, as the dike trends northwest before swinging back to the northeast. The northwest-trending shear zone was also important during mineralization (unpublished report by Addwest Minerals International Ltd., 1997). ? There are three types of deposits: sulfide disseminations, veins, and skarns. The dike contains disseminated sulfides and stockwork quartz-sulfide veinlets. Limonite and ankerite alteration is widespread. Adjacent to the dike, calc-silcate skarn bodies up to 15 feet thick contain 0.1 ounce of gold per ton and 10% combined lead and zinc. The skarn comprises pyrrhotite, pyrite, chalcopyrite, and arsenopyrite (up to 10% by volume) in a epidote, garnet, and actinolite (unpublished report by Addwest Minerals International Ltd., 1997).
  • Age = The Mayflower prospect is a satellite of the nearby Golden Zone mine (HE043) which has been dated at 70-65 Ma (Late Cretaceous) (Swainbank and others, 1977).
  • Age = Chron age is for the nearby Golden Zone mine.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Active

Mining district

District name Valdez Creek

Comments on the workings information

  • Workings / Exploration = The prospect was explored by a reconnaissance IP and CS-AMT survey and by 1,500 feet of trenching. One shallow shaft was dug (during the 1930s?) and since has collapsed (Hawley and Clark, 1974).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011323
USGS Alaska Resource Data File ARDF HE040

Bibliographic references

  • Deposit

    Berg, H.C., and Cobb, E.H., 1967, Metalliferous Lode Deposits of Alaska. U.S. Geological Survey Bulletin 1246, 254 p.

  • Deposit

    Mulligan, J.J., Warfield, R.S., and Wells, R.R., 1967, Sampling a gold-copper deposit, Golden Zone Mine, south-central Alaska: U.S. Bureau of Mines Open-File Report 9-67, 59 p.

  • Deposit

    Hawley, C.C., and Clark, A.L., 1974, Geology and mineral deposits of the upper Chulitna district, Alaska: U.S. Geological Survey Professional Paper 758-B, p. 1-47, 2 sheets, scale 1:12,000 and 1:48,000.

  • Deposit

    Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Healy quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-1062, 113 p.

Comments on the references

  • Primary Reference = unpublished report by Addwest Minerals International Ltd., 1997

General comments

Subject category Comment text
Deposit Model Name = Combination of polymetallic vein and Au-Ag breccia pipe or Cu-Au porphyry (Cox and Singer, 1986; models 22c, 20c), with Cu skarn (Cox and Singer, 1986; model 18b)
Deposit Model Number = 22c, 20c, 18b
Deposit Other Comments = See Golden Zone mine (HE043).

Reporter information

Type Date Name Affiliation Comment
Reporter 07-APR-2000 N. Van Wyck Stevens Exploration Management Corporation