Alaska Resource Data File, 

Chignik quadrangle, Alaska 

By Steven H. Pilcher 1 

Open-File Report 00-130 

2000 

This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey 

editorial standards or with the North American Stratigraphic Code. Any use of trade, firm, or 

product names is for descriptive purposes only and does not imply endorsement by the U.S. 

Government. 

U.S. DEPARTMENT OF THE INTERIOR 

U.S. GEOLOGICAL SURVEY 

1

 Anchorage, Alaska 
Alaska Resource Data File 

This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic code. Any use 

of trade, product, or firm names is for descriptive purposes only and does not imply 

endorsement by the U.S. Government. 

OPEN-FILE REPORT 00-130 

Alaska Peninsula

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Distribution of mineral occurrences in the Chignik

 1:250,000-scale quadrangle, Alaska Peninsula, Alaska

 This and related reports are accessible through the USGS World Wide Web site 

http://ardf.wr.usgs.gov. Comments or information regarding corrections or missing 

data, or requests for digital retrievals should be directed to: Frederic Wilson, USGS, 4200 

University Dr., Anchorage, AK 99508-4667, e-mail fwilson@usgs.gov, telephone (907) 

786-7448. This compilation is authored by:

 Steven H. Pilcher

 Anchorage, AK

Chignik quadrangle

 Descriptions of the mineral occurrences shown on the accompanying figure follow. 

See U.S. Geological Survey (1996) for a description of the information content of each field 

in the records. The data presented here are maintained as part of a statewide database 

on mines, prospects and mineral occurrences throughout Alaska.
Alaska Resource Data File 

Page 2 

Site name(s): Braided Creeks; Cathedral Creek; Manhattan 

Site type: Prospect 

ARDF no.: CG001 

Latitude: 56.527 Quadrangle: CG C-2 

Longitude: 158.573 

Location description and accuracy:

 This site represents a large color anomaly. The anomaly is approximately 3 miles northsouth and 9 miles east-west, covering parts of T. 42 S., R. 59 and 60 W., of the Seward 

Meridian, encompassing the headwaters of Milk, Cathedral, and Braided Creeks (Cobb, 

1972: MF-374, locality 1; U.S. Bureau of Mines, 1973, localilties 11, 12, 14, 15, and 18; 

MacKevett and Holloway, 1977, localities 1, 8-16, 18, and 19; Cox and others, 1981, locality 2; Nokleberg and others, 1987, locality AP 10). The map site is plotted at the location of the Manhattan prospect, near the headwaters of Braided Creek (map C-2). The location is accurate to within 1/2 mile. 

Commodities: 

 Main: Ag, Au, Cu, Pb, Zn 

 Other: As 

Ore minerals: Arsenopyrite, chalcopyrite, galena, gold, pyrargyrite, pyrite, pyrrhotite, 

sphalerite, tetrahedrite 

Gangue minerals: Dolomite, quartz 

Geologic description:

 Rocks in this prospect area include a large diorite stock of Oligocene age and smaller 

andesite and dacite plug domes of Miocene and Oligocene ages. The diorite stock cuts 

dacite flows of Oligocene age and sedimentary rocks of the Meshik Formation 

(Detterman and others, 1981). 

 Mineralization within the main part of the stock has been described as a large, discontinuous sulfide system with low order copper and molybdenum anomalies (Fields, 1977). 

Cathedral and Milk Creeks drain an area distinguished by a cluster of silt samples containing anomalous values in copper and molybdenum. Fields, however, did not report any 

outcropping copper-molybdenum mineralization in this area, although chalcopyrite in 

quartz-chlorite veins was found in float. Nokleberg and others (1987) reported the occurrence of copper and molybdenite in zones of sericitic alteration within intrusives in the 

area. 

 Pervasive pyrite (2 to 7 percent) is present in the sedimentary rocks and to a minor deCG001 
Alaska Resource Data File 

Page 3 

gree in the volcanic rocks peripheral to the stock. In some areas the pyrite is accompanied 

by epidote, chlorite, and clay alteration. Other areas exhibit pervasive sericitization. 

 In the eastern part of the area of the color anomaly, base and precious metal veins crop 

out at the Manhattan prospect, near the headwaters of Braided Creek. Approximately 20 

veins have been discovered, traceable for up to 700 feet on strike. These are up to several 

feet in thickness and contain arsenopyrite, chalcopyrite, galena, gold, pyrargyrite, pyrite, 

pyrrhotite, quartz, sphalerite, and tetrahedrite. The veins cut the Chignik Formation and 

dacite porphyry. They trend N 20 to 45 E It has been suggested that these veins represent 

a peripheral zone to the Cathedral Creek sulfide system (Wilson and Cox, 1983). 

 At the Manhattan prospect Pan American Exploration (now Amoco) carried out geophysical surveys and drilled 14 holes for a total of 2,539 meters in 1965-1967. Bear Creek 

Mining Company briefly explored the area in 1975. In 1979 Resource Associates of 

Alaska sampled a 2-3 foot thick vein traceable for 700 feet. Their assay results are as follows: copper to 2400 ppm, gold to 0.596 ounce per ton, lead to 1.06 percent, silver to 

16.29 ounces per ton, zinc to 9.5 percent (Anderson and others, 1979). In 1984 Anaconda 

drilled approximately 6 holes on this vein system. They reported metal values of 0.25 to 

0.5 ounce gold per ton, 1 to 10 ounces silver per ton, and 5 to 10 percent lead-zinc. 

 Young and others (1997) estimate a resource at the Manhattan prospect of 90,000 to 

180,000 tonnes grading 0.6 ounce gold per ton, 10 ounces silver per ton, and 15 percent 

lead-zinc. Subsequent owners claim a resource of 575,000 tons grading 0.39 ounce gold 

equivalent per ton (Alaska Earth Science, 1997). 

Alteration:

 The sedimentary rocks peripheral to the stock exhibit pervasive sericitization in some 

areas and epidote, chlorite, clay alteration in others. Chloritization in the stock is common 

and localized areas of quartz-sericite alteration have been reported. 

Age of mineralization:

Tertiary or younger. 

Deposit model:

Polymetallic vein and possible upper level of a prophyry copper system (Cox and Singer, 

1986; models 22c and 17?) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

22c and 17? 

Production Status: None 

Site Status: Inactive 

Workings/exploration:

 Fourteen holes were drilled at the Manhatten prospect on Braided Creek by Pan American Exploration in 1965-67 for a total of 2539 meters. Bear Creek Mining Company examined and sampled the prospect for 3 days in 1975. Resource Associates of Alaska sampled a polymetallic vein here in 1979. Anaconda drilled approximately 6 holes on the 

CG001 
Alaska Resource Data File 

Page 4 

Braided Creek showings in 1984. 

 Sampling of 1 vein by Resource Associates of Alaska assayed as follows: copper to 

2400 ppm, gold to 0.596 ounce per ton, lead to 1.06 percent, silver to 16.29 ounces per 

ton, and zinc to 9.5 percent. Anaconda reported metal values of 0.25 to 0.5 ounce gold per 

ton, 1 to 10 ounces silver per ton, and 5 to 10 percent lead-zinc. 

Production notes:

 

Reserves:

 Young and others (1997) list a resource of 90,000 to 180,000 tonnes grading 10 ounces 

silver per ton, 0.6 ounces gold per ton, and 15 percent lead-zinc. Subsequent owners 

claim 575,000 tons grading 0.39 ounce gold equivalent per ton (Alaska Earth Science, 

1997). 

Additional comments:

 This site is located in Alaska Peninsula National Wildlife Refuge. 

References:

Brown and others, 1965; Cobb, 1972 (MF-374); U.S. Bureau of Mines, 1973; MacKevett 

and Holloway, 1977; Fields, 1977; Anderson and others, 1979; Cobb, 1980 (OFR 80-

909); Wilson, 1980; Cox and others, 1981; Detterman and others, 1981; Wilson and Cox, 

1983; Nokleberg and others, 1987; Alaska Earth Science, 1997; Young and others, 1997. 

Primary reference: Wilson and Cox, 1983 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG001 
Alaska Resource Data File 

Page 5 

Site name(s): Mallard Duck Bay; Calcite; Marshinlak 

Site type: Occurrences 

ARDF no.: CG002 

Latitude: 56.231 Quadrangle: CG A-2 

Longitude: 158.511 

Location description and accuracy:

 This site represents an area southeast of Chignik Lagoon at the head of Mallard Duck 

Bay (Berg and Cobb, 1967, locality 2; Cobb, 1972: MF-374, locality 2; MacKevett and 

Holloway, 1977, locality 2; Cox and others, 1981, locality 8; Nokleberg and others, 1987, 

locality AP 11). The map site is plotted at an elevation of about 1000 feet, about 0.2 miles 

southeast of the head of Mallard Duch Bay. The location is accurate to within 1/4 mile. 

Commodities: 

 Main: Ag, Au, Cu, Mo, Pb, Zn 

 Other: As 

Ore minerals: Arsenopyrite, chalcopyrite, galena, gold, pyrite, sphalerite 

Gangue minerals: Calcite, quartz, siderite 

Geologic description:

 This site represents a large propylitically altered zone covering an area 6 miles by 2 1/2 

miles at the head of Mallard Duck Bay (Wilson and Cox, 1983). Elevation of the zone 

varies from sea level to 600 meters. The altered zone is associated with widespread introduction of pyrite and with low-order drainage anomalies (60 ppm copper, 15 ppm molybdenum, 0.3 ppm silver). 

 Rock types include diorite stocks up to 2000 feet in diameter and a system of northeasttrending quartz-diorite dikes which are up to 1/2 mile in length and up to several hundred 

feet in thickness. A system of andesite dikes trends N 30 to 40 W and dips vertically 

across a 4000-foot wide zone. All of these intrusives cut Eocene-Oligocene volcanics of 

the Meshik Formation which consists of andesite and basalt flows, volcaniclastic breccias, volcaniclastic sediments, and tuffaceous units. 

 Within the large area of propylitized rock is a zone of intense argillic alteration which 

covers an area of approximately 2 miles by 1/2 mile. This is referred to as the central argillic zone (Anderson and others 1979). The argillic alteration appears to be related to the 

northwest-trending andesite dikes because it forms envelopes up to 100 feet wide on either side of the dikes. The altered areas exhibit some silicification and introduction of disseminated pyrite. They also contain coarse stockworks of fractures, some of which conCG002 
Alaska Resource Data File 

Page 6 

tain quartz, pyrite, and rarely molybdenite. 

 Molybdenum mineralization occurs primarily in a stockwork that lies between two parallel andesite dikes outside of the central argillic zone. The mineralized rock is limonitic 

and exihibits silicification and minor argillization. As the dikes are approached the alteration increases and the molybdenum mineralization decreases (Anderson and others, 

1979). The molybdenum zone has been traced for 100 feet but the total length is unknown. Fields (1977) notes molybdenum values ranging from 2 to 99 ppm in rock samples. 

 Systems of northwest-trending polymetallic veins are present in the propylitized volcanics. The Calcite and Mallard Duck vein systems occur in an area 1/2 to 1 mile southwest 

of the central argillic zone. Individual veins are up to 800 feet long and 10 feet wide. 

Other veins are known to extend along this trend for over 4 miles northwest to the beach 

exposures at Mallard Duck Bay. The Marshinlak vein system is located approximately 2 

miles north of the central argillic zone and has been traced intermittently for over 6500 

feet in a northwest direction. These veins are up to 15 feet in thickness. Minor strike 

trends include northeast, north-south, and east-west. The veins vary in composition from 

quartz to quartz-calcite to quartz-siderite and may carry up to 5 percent sulfides, including 

arsenopyrite, chalcopyrite, galena, pyrite, and sphalerite. Some veins exhibit cockscomb 

features and some show evidence of repetitive pulsing of quartz and sulfides. 

 Metal values in the Calcite and Mallard Duck systems range as follows: 3360 ppm to 

4.2 percent copper, < 0.02 ppm to 3.3 ppm gold, 1100 ppm to 4.45 percent lead, 20 ppm 

to 21ounces silver ounces per ton, 1100 ppm to 22.7 percent zinc (Butherus and others, 

1981). Trace amounts of antimony and mercury were also detected. Copper, lead, and 

zinc values obtained in the Marshinlak system were all less than 100 ppm. Gold values 

ranged from 0.48 ppm to 0.163 ounce per ton and silver values from 3.4 ppm to 0.54 

ounce per ton. 

Alteration:

 Propylitically altered volcanics cover an area of approximately 6 by 2 1/2 miles. Within 

this altered zone argillic alteration forms envelopes up to 100 feet wide peripheral to 

northwest-trending andesite dikes, resulting in a central argillic zone which covers an area 

of approximately 2 by 1/2 miles. 

Age of mineralization:

 The probable age of mineralization is estimated at 21-27 million years (Cox and others, 

1981). 

Deposit model:

Porphyry copper; porphyry copper-molybdenum; polymetallic veins (Cox and Singer, 

1986; models 17, 21a, 22c) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

17, 21a, 22c 

Production Status: None 

CG002 
Alaska Resource Data File 

Page 7 

Site Status: Inactive 

Workings/exploration:

 Gold claims were staked in the early part of the century. Bear Creek Mining Company 

mapped and sampled this zone in 1975 and 1976. Resource Associates of Alaska did detailed mapping and sampling in 1979, 1981, and 1982. 

Production notes:

 

Reserves:

 

Additional comments:

 This site is on land patented by or interim conveyed to the Bristol Bay Native Corporation. 

References:

Atwood, 1911; Berg and Cobb, 1967; Cobb, 1972 (MF-374); MacKevett and Holloway, 

1977; Fields, 1977; Anderson and others, 1979; Wilson, 1980; Cobb, 1980 (OFR 80-

909); Butherus and others, 1981; Cox and others, 1981; Detterman and others, 1981; Wilson and Cox, 1983; Nokleberg and others, 1987. 

Primary reference: Anderson and others, 1979 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG002 
Alaska Resource Data File 

Page 8 

Site name(s): Port Heiden 

Site type: Occurrence 

ARDF no.: CG003 

Latitude: 56.8 Quadrangle: CG D-4 

Longitude: 159.1 

Location description and accuracy:

 This site represents 20 miles of beach placers on the northwest coast of the Alaska Peninsula between the Seal Islands and Port Heiden (Cobb, 1973: B-1374, locality 5; 

MacKevett and Holloway, 1977, locality 4; Cobb, 1980: OFR 80-909, locality 4). 

Commodities: 

 Main: Fe, Ti 

 Other: Au 

Ore minerals: Gold, ilmenite, magnetite 

Gangue minerals: 

Geologic description:

 This occurrence consists of beach placer deposits of ilmenite and titaniferous magnetite 

in narrow spits and bars along the outer shores of low-lying mudflats. The beaches are 

sandy gravel, often loosely packed. 

 Twenty-four auger samples were collected along this 20-mile section (Berryhill, 1963). 

They were screened, tabled, and run through a magnetic separator. In the magnetic fraction iron content ranged from 2.2 to 103.6 pounds per cubic yard, and the titanium oxide 

content ranged from 0.6 to 21.9 pounds. In the non-magnetic fraction the titanium oxide 

content ranged from 0 to 1.2 pounds per cubic yard. A trace of flour gold was present in 5 

samples. 

Alteration:

 

Age of mineralization:

Quaternary. 

Deposit model:

Shoreline placer titanium (Cox and Singer, 1986; model 39c) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

CG003 
Alaska Resource Data File 

Page 9 

39c 

Production Status: None 

Site Status: Inactive 

Workings/exploration:

 The magnetic fraction of 24 auger samples collected in 1963 contained 2.2 to 103.6 

pounds iron and 0.6 to 21.9 pounds titanium oxide per cubic yard. The non-magnetic fraction contained 0 to1.2 pounds titanium oxide per cubic yard. 

Production notes:

 

Reserves:

 

Additional comments:

 This site is located on state land, part of which is in the Port Heiden Critical Habitat 

Area. 

References:

Berryhill, 1963; Cobb, 1972 (MF-374); Cobb, 1973 (B-1374); MacKevett and Holloway, 

1977; Cobb, 1980 (OFR 80-909). 

Primary reference: Berryhill, 1963 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG003 
Alaska Resource Data File 

Page 10 

Site name(s): Port Moller 

Site type: Occurrence 

ARDF no.: CG004 

Latitude: 56.1 Quadrangle: CG A-8 

Longitude: 160.5 

Location description and accuracy:

 This site represents 5 miles of beach placer deposits on the northwest coast of the 

Alaska Peninsula extending for approximately 5 miles southwest of Franks Lagoon onto 

the Port Moller 1:250,000-scale map sheet (Cobb, 1973: B-1374, locality 3; MacKevett 

and Holloway, 1977, locality 4). The maps site is plotted at Franks Lagoon. 

Commodities: 

 Main: Fe, Ti 

 Other: Au? 

Ore minerals: Gold?, ilmenite, magnetite 

Gangue minerals: 

Geologic description:

 This occurrence consists of beach placer deposits of magnetite and titaniferous ilmenite 

in well-developed sandy spits extending 5 miles southwest of Franks Lagoon. 

 Berryhill (1963) collected 11 auger samples and a few shovel samples along this 5-mile 

section of beach. These samples were screened, tabled, and run through a magnetic separater. The magnetic fraction contained 1.1 to 191.4 pounds iron per cubic yard and 0.3 to 

42.2 pounds titanium oxide. The non-magnetic fraction contained 0 to 10.3 pounds per 

cubic yard titanium oxide. 

Alteration:

 

Age of mineralization:

Quaternary. 

Deposit model:

Shoreline placer titanium (Cox and Singer, 1986; model 39c) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

39c 

CG004 
Alaska Resource Data File 

Page 11 

Production Status: None 

Site Status: Inactive 

Workings/exploration:

 The magnetitic fraction of 11 auger and shovel samples collected in 1963 contained 1.1 

to 191.4 pounds iron and 0.3 to 42.2 pounds titanium oxide per cubic yard. The nonmagnetic fraction contained 0 to 10.3 pounds titanium oxide per cubic yard. 

Production notes:

 

Reserves:

 

Additional comments:

 This site is located on state land. 

References:

Berryhill, 1963; Cobb, 1973 (MF-374); MacKevett and Holloway, 1977; Cobb, 1980 

(OFR 80-909). 

Primary reference: Berryhill, 1963 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG004 
Alaska Resource Data File 

Page 12 

Site name(s): Warner Bay; Prospect Bay 

Site type: Prospect 

ARDF no.: CG005 

Latitude: 56.15 Quadrangle: CG A-2 

Longitude: 158.41 

Location description and accuracy:

 This site is at or near sea level on the west side of Warner Bay just to the south of the 

spit (Berg and Cobb, 1967, locality 3; Cobb, 1972: MF-374; Cobb, 1980: OFR 80-909, 

locality 3; MacKevett and Holloway, 1977, locality 3; Cox and others, 1981, locality 11; 

Nokleberg and others, 1987, locality AP 9). Site location as plotted is accurate to within 1 

mile. 

Commodities: 

 Main: Ag, Au, Cu, Mo, Pb, Zn 

 Other: Sn, W 

Ore minerals: Chalcopyrite, galena, gold, molybdenite, pyrite, sphalerite, wolframite? 

Gangue minerals: Calcite, chlorite, hematite, quartz, zeolites 

Geologic description:

 This prospect is within the northeast part of the Devils Bay batholith (Detterman and 

others, 1981). This pluton is a multiphase granodiorite to tonalite which intrudes sediments of the Cretaceous Hoodo Formation. Potassium-argon dates of the pluton indicate a 

range of between 5 and 10 million years (Wilson, 1980). 

 Atwood (1911) first described this prospect as a 50-foot wide crushed zone containing 

chalcopyrite, galena, pyrite, quartz and sphalerite. Later, more extensive investigation has 

shown that mineralization is exposed mostly in vertical cliffs extending down to sea level. 

Chalcopyrite and molybdenite occur as veinlets on joint surfaces spaced 5 to 10 centimeters apart (Cox and others, 1981). The extent of this mineralization has not been reported. 

Four samples collected by Resource Associates of Alaska in 1979 assayed as follows: 520 

to 16,000 ppm copper, 280 to 9,110 ppm molybdenum, 0.4 to 2.5 ppm silver, 20 ppm tin, 

and 9-128 ppm tungsten. Cox and others (1981) list the grade of this mineralization at 0 

to 0.07 percent molybdenum with a trace of copper. Nokleberg and others (1987) list an 

average grade of 0.03 percent copper with values up to 0.7 percent. 

 Massive sulfide veins, ranging in width from 2 inches to 4 feet occur filling a northwest-trending nearly vertical fracture system. These are spaced approximately 100 feet 

apart over a distance of 3500 feet along the beach. Assays of this material by Resource 

CG005 
Alaska Resource Data File 

Page 13 

Associates of Alaska returned values of up to 5.7 percent copper, 0.312 ounce gold per 

ton, 0.91 percent molybdenum, 1.25 percent lead, 395 ppm tungsten, and 10.8 percent 

zinc (Anderson and others, 1979). One sample reported 3000 ppm lanthanum. 

 A breccia pipe, approximately 3 meters in diameter, occurs at the extreme north end of 

the showing. It contains clasts of propylitically altered granodiorite cemented by galena, 

pyrite, sphalerite, calcite, chlorite, and zeolites. The small tonnage in sight is estimated at 

>10,000 tonnes. Anderson and others (1979) give values for a high-grade sample as follows: 1600 ppm copper, 0.1 ppm gold, 4000 ppm lead, 2.3 ppm silver, 8 ppm tungsten, 

400 ppm zinc. 

 Four holes were drilled on the prospect in 1965 and 1966 by Pan American Exploration 

(now Amoco) for a total of 2432 feet Cobb (1980: OFR 80-909) reports drilling as recent 

as 1977. 

Alteration:

 Alteration of granodiorite host rock is limited to partial alteration (?) of amphibole to 

biotite and slight chloritization of biotite. Clasts of granodiorite in the breccia pipe exhibit 

propylitic alteration. Biotitic and sericitic alteration occur as thin selvages along veinlets. 

Age of mineralization:

 The age of mineralization is estimated at less than 6.5 million years (Wilson, 1980). 

Deposit model:

Porphyry copper-molybdenum; polymetallic vein (Cox and Singer, 1986; models 21a, 

22c) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

21a, 22c 

Production Status: None 

Site Status: Inactive 

Workings/exploration:

 Two short adits were driven in the early 1900's (Atwood, 1911). In the 1960's four holes 

were drilled for a total of 2432 feet. Some drilling has been reported as late as 1977. Bear 

Creek Mining Company visited the property in 1975 and Resource Associates mapped 

and sampled there in 1979. 

Production notes:

 

Reserves:

 

Additional comments:

 This site is located on land patented by or interim conveyed to the Bristol Bay Native 

Corporation. 

CG005 
Alaska Resource Data File 

Page 14 

References:

Atwood, 1909; Atwood, 1911; Knappen, 1929; Berg and Cobb, 1967; Cobb, 1972 (MF374); Fields, 1977; MacKevett and Holloway, 1977; Anderson and others, 1979; Cobb, 

1980 (OFR 80-909); Wilson, 1980; Cox and others, 1981; Detterman and others, 1981; 

Wilson and Cox, 1983; Nokleberg and others, 1987. 

Primary reference: Wilson and Cox, 1983 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG005 
Alaska Resource Data File 

Page 15 

Site name(s): Bearskin Gulch 

Site type: Occurrence 

ARDF no.: CG006 

Latitude: 56.25 Quadrangle: CG B-3 

Longitude: 158.95 

Location description and accuracy:

 This site represents an area of approximately 8 square miles in T. 45 S., R. 62 W., of the 

Seward Meridian, covering the headwaters of both the east and west forks of Bearskin 

Creek (Cox and others, 1981, locality 6). The map site is plotted at an elevation of 1200 

feet at the head of the east branch of Bearskin Gulch, which is at the head of Bearskin 

Creek. The location is accurate to within 2 miles. 

Commodities: 

 Main: Ag, Au, Cu, Mo 

 Other: 

Ore minerals: Chalcopyrite, gold, molybdenite, pyrite 

Gangue minerals: 

Geologic description:

 The Jurassic Naknek Formation is the main rock unit exposed at the site (Detterman and 

others, 1981). It consists of graywacke, siliceous siltstone, hornfels, quartzite, and minor 

grit. The strata strike N 20 to 45 E, and dip 28 to 40 southeast. A small (1000 feet diameter) weakly-mineralized diorite porphyry stock crops out within the western fork of Bearskin Creek. 

 The sulfide system as exposed is approximately 2 by 4 miles (Fields, 1977). Pyrite and 

chalcopyrite occur in highly shattered and fractured rocks throughout the area as fracture 

fillings, veinlets, and disseminations. Some of the better copper mineralization appears to 

occur within the sandstone and grit units of the Naknek Formation. The sulfide content of 

the sedimentary rocks varies from 3 to 10 percent with a high pyrite to chalcopyrite ratio. 

Within the diorite sulfide content is 1 to 2 percent. 

 Secondary biotite is present within the copper-bearing areas and beyond. Chlorite is 

ubiquituous throughout the area in all rock types. Sericite occurs as veinlet selvages and 

within the higher sulfide areas on the periphery of the system. Other peripheral alteration 

minerals include epidote, kaolinite, montmorillonite, and pyrophyllite. 

 In the eastern fork of Bearskin Creek metal values ranged from 235 to 1500 ppm copper, 0.01 to 0.13 ppm gold, 4 to 30 ppm molybdenum, 0 to 4.1 ppm silver (Fields, 1977). 

CG006 
Alaska Resource Data File 

Page 16 

These values outlined an area of 1500 by 3000 feet. In the diorite located in the western 

fork maximum values of 800 to 900 ppm copper, 0.02 to 0.62 ppm gold, and 2 to 26 ppm 

molybdenum were obtained from an area of 1000 feet by 2000 feet. 

Alteration:

 Secondary biotite is present within the copper-bearing areas and beyond. Chlorite is present throughout the area in all rock types. Sericite is present as veinlet selvages and within 

the higher sulfide areas on the periphery of the system. Other periphery alteration minerals include epidote, kaolinite, montmorillonite, and pyrophyllite. 

Age of mineralization:

Tertiary? 

Deposit model:

Porphyry copper; porphyry copper-gold; porphyry copper-molybdenum (Cox and Singer, 

1986; models 17, 20c, 21a) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

17, 20c, 21a 

Production Status: None 

Site Status: Inactive 

Workings/exploration:

 Bear Creek mapped and sampled this site during the period 1975 to 1976 (Fields,1977). 

Maximum metal values obtained were 1500 ppm copper, 30 ppm molybdenum, and small 

amounts of precious metals. 

Production notes:

 

Reserves:

 

Additional comments:

 This site is on lands selected by the Bristol Bay Native Corporation. 

References:

Fields, 1977; Cox and others, 1981. 

Primary reference: Fields, 1977 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG006 
Alaska Resource Data File 

Page 17 

Site name(s): Bee Creek; Dry Creek 

Site type: Prospect 

ARDF no.: CG007 

Latitude: 56.51 Quadrangle: CG C-2 

Longitude: 158.39 

Location description and accuracy:

 This site is located in T. 42 S., R. 58 W., of the Seward Meridian, near the headwaters 

of an unnamed creek entering Dry Creek approximately 1 mile north of Chignik Bay 

(Bundtzen and others, 1982, locality 89; Cox and others, 1981, locality 3; Nokleberg and 

others, 1987, locality AP 12). Site location is accurate to within 1 mile. 

Commodities: 

 Main: Ag, Au, Cu, Mo 

 Other: Pb, Zn 

Ore minerals: Chalcopyrite, chrysocolla, galena, gold, malachite, molybdenite, pyrite, pyrrhotite, sphalerite 

Gangue minerals: Gypsum, quartz 

Geologic description:

 At this prospect sedimentary units (sandstone, siltstone, argillite, and conglomerate) of 

the Jurassic Naknek Formation have been intruded by a small dacite stock, which is surrounded by a sulfide system and alteration halo covering approximately 2 square miles 

(Fields, 1977). The main intrusive is dacite, but quartz diorite, andesite, and quartz porphyry have also been reported. These intrusives are part of a nearly east-west trending linear belt extending from Weasel Mountain (CG008) on the east to Cathedral Creek 

(CG001) on the west. This prospect was explored by Bear Creek Mining Company in 

1975 and 1976 and by Resource Associates of Alaska in 1979 and 1981. 

 The prospect was identified on the basis of silt and color anomalies at the headwaters of 

the unnamed creek. Clusters of arsenic, copper, gold, lead, silver, and zinc silt anomalies 

surround the deposit. The main mineralized area is in a steep cirque basin at elevations of 

500 to 1500 feet. Work by Resource Associates of Alaska (Anderson and others, 1979) 

suggest that mineralization may extend southwest into the McKinsey Valley. 

 Mineralization occurs mainly peripheral to the dacite stock with the bulk of it in arkose, 

conglomerate, and quartzite. Resource Associates of Alaska (Anderson and others, 1979) 

claim that the hornfelsed sediments near the contact contain the best mineralization. Mineralization decreases towards the core of the intrusive. 

CG007 
Alaska Resource Data File 

Page 18 

 Chalcopyrite and pyrite occur within a stockwork of hairline fractures containing 

quartz-sulfide veinlets throughout an area 2000 feet in diameter. Disseminated chalcopyrite and pyrite occur in biotized hornfels and these sulfides replace mafic minerals in the 

dacite. Molybdenite is present as fine-grained disseminations within the quartz veinlets, 

within gypsum veinlets, and within chalcopyrite clots. Pyrite forms a halo on the periphery of the system. Some magnetite veins have been reported which appear to be early in 

the mineralization sequence and contain no associated sulfides. Veins containing lead and 

zinc values occur peripheral to the copper zone. 

 Within the copper zone richer surface samples contained 500 to 2000 ppm copper, 0.04 

to 0.18 ppm gold, 20 to 220 ppm molybdenum, and 0.4 to 0.18 ppm silver (Fields, 1977). 

Bear Creek drilled 5 holes in this zone in 1975-76. Four holes averaged 500-1200 ppm 

copper and 5-28 ppm molybdenum. The best hole averaged 0.25 percent copper, 0.01 percent molybdenum, and 0.06 ppm gold over 500 feet. In 1979 Resource Associates of 

Alaska discovered two areas of polymetallic quartz veins. Samples of this material contained up to 5700 ppm copper, 4.4 ppm gold, 1.18 percent lead, 530 ppm molybdenum, 

4.2 ounces silver per ton, and 1.62 percent zinc (Anderson and others, 1979). A resource 

of 4.5 to 9 million tonnes grading 0.25 percent copper and 0.01 percent molybdenum has 

been estimated (Young and others, 1997). 

 An age of the mineralization has been determined at between 3.2 and 3.8 million years 

(Wilson, 1980). 

 Secondary biotite is widely distributed both within and outside of the chalcopyrite zone. 

It replaces mafics and forms fine-grained aggregates 

 both in the pluton and in the surrounding sediments. The biotite zone centers on the stock 

and extends irregularly southward over an area of 1500 by 3400 feet. Discontinuous zones 

of sericitic alteration occur peripheral to the biotite zone and have been reported to be superimposed on the potassic and propylitic alteration. Propylitic alteration forms the outer 

alteration zone and is represented by chlorite and epidote. A strong zone of argillic alteration located between the phyllic and propylitic zones has been reported (Butherus and 

others, 1981). 

Alteration:

 The alteration at this prospect appears to be the classic porphyry type with a potassic 

core grading outward through phyllic, argillic, and propylitic alteration zones although 

these may not all be developed fully. The best copper mineralization is in the potassic 

zone. 

Age of mineralization:

Pliocene. 

Deposit model:

Porphyry copper; porphyry copper-molybdenum (Cox and Singer, 1986; models 17, 21a) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

17, 21a 

Production Status: None 

CG007 
Alaska Resource Data File 

Page 19 

Site Status: Inactive 

Workings/exploration:

 In 1975-76 Bear Creek Mining Company did detailed mapping and sampling and drilled 

5 holes totalling 1865 feet. Resource Associates of Alaska carried out exploration here in 

1979 and 1981. Additional mapping and sampling was done by the U.S. Geological Survey in 1980 and 1981. The prospect contains an estimated resource of 4.5 to 9 million 

tonnes grading 0.25 percent copper, 0.01 percent molybdenum, and trace gold. 

Production notes:

 

Reserves:

 The prospect contains an estimated resource of 4.5 to 9 million tonnes grading 0.25 percent copper, 0.01 percent molybdenum, and trace gold. 

Additional comments:

 This prospect is located on land conveyed to or patented by the Bristol Bay Native Corporation. 

References:

Fields, 1977; Anderson and others, 1979; Wilson, 1980; Cox and others, 1981; Butherus 

and others, 1981; Wilson and Cox, 1983; Nokleberg and others, 1987; Young and others, 

1997. 

Primary reference: Fields, 1977 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG007 
Alaska Resource Data File 

Page 20 

Site name(s): Weasel Mountain 

Site type: Occurrence 

ARDF no.: CG008 

Latitude: 56.49 Quadrangle: CG B-1 

Longitude: 158.19 

Location description and accuracy:

 This occurrence is located approximately 2 miles northwest of Weasel Mountain and 2 

miles west of Hook Bay in T. 42 and 43 S., R. 56 and 57 W., of the Seward Meridian 

(Cox and others, 1981, locality 4; MacKevett and Holloway, locality 25?). Location is accurate to within 1 mile. 

Commodities: 

 Main: Cu, Mo 

 Other: Ag, Au, Pb, Zn 

Ore minerals: Chalcopyrite, galena, molybdenite, pyrite, sphalerite 

Gangue minerals: Calcite, quartz, tourmaline 

Geologic description:

 The area of this site is underlain by strata of the Cretaceous Chignik Formation and by 

the interbedded sediments, volcaniclastics, and andesite of the Oligocene-Pliocene 

Meshik Formation. 

 Fields (1977) describes two major intrusive systems, a diorite porphyry dike or sill and 

a younger quartz porphyry mass. The diorite is approximately 1/2 mile in width and extends in a northeast direction for more than a mile. The quartz porphyry intrudes the the 

diorite, extends in a northeast direction, and measures approximately 700 by 3000 feet in 

outcrop. Butherus (1981) reports these intrusive phases as occupying approximately two 

square miles. Large areas of hornfels have resulted from thermal metamorphism of the 

nearby sedimentary rock. 

 The site is marked by a color anomaly which contains 1 to 6 percent sulfides over an 

area 2 miles in long by 1 mile wide. Fields (1977) describes the sulfides as mostly fracture controlled, primarily along certain marginal zones of the diorite and quartz porphyry 

and in the metasediments to the west. Chalcopyrite and sparse molybdenite occur in the 

marginal areas of the diorite, mostly along northeast-trending fracture zones. The resulting copper anomaly is approximately 700 by 1500 feet and contains 500 to 2100 ppm 

copper. The molybdenum anomaly coincides in part with the copper but has a more easterly trend. This anomaly is approximately 1000 by 2000 feet and contains 22 to 160 ppm 

CG008 
Alaska Resource Data File 

Page 21 

molybdenum. Low gold values (0.04 to 0.18 ppm) coincide with the molybdenum. Diffuse peripheral lead-zinc values are present. 

 Alteration is diffuse with no strong focus on a core. A broad sericitic zone exists within 

the area of higher sulfide content. Sericite occurs pervasively and along fractures. Propylitic alteration in the sediments is patchy and consists of chlorite and epidote clots. 

 Butherus (1981) reports intrusive breccia near the head of a valley in the NW1/4 sec. 2, 

T. 43 S., R. 57 W., of the Seward Meridian. The breccia, approximately 800 feet in diameter, contains traces of chalcopyrite and sphalerite in a quartz-tourmaline matrix. Other 

minerals present include pyrite, calcite, and barite. One sample contained >10,000 ppm 

copper, 0.06 ppm gold, 13 ppm lead, 28 ppm silver, and 1800 ppm zinc. Three other samples contained up to 750 ppm copper, 0.02 to 0.04 ppm gold, and 1.2 to 11.4 ppm silver. 

Alteration:

 Alteration consists of a broad sericitic zone within the area of higher sulfide content and 

a peripheral, patchy propylitic zone. 

Age of mineralization:

Tertiary. 

Deposit model:

Porphyry copper; porphyry copper-molybdenum (Cox and Singer, 1986; models 17, 21a) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

17, 21a 

Production Status: None 

Site Status: Inactive 

Workings/exploration:

 Bear Creek Mining Company mapped and sampled this occurrence in 1975-1976, and 

Resource Associates of Alaska explored it in 1979 and 1981. 

 Copper values of 500 to 2100 ppm occur in an area of 700 by 1500 feet. Molybdenum 

values of 22 to 160 ppm occur in an area of 1000 by 2000 feet. Gold values are up to 0.18 

ppm. 

Production notes:

 

Reserves:

 

Additional comments:

 This site is partially on land selected by the Bristol Bay Native Corporation. 

References:

Fields, 1977; MacKevett and Holloway, 1977; Anderson and others, 1979; Butherus and 

others, 1981;Cox and others, 1981; Detterman and others, 1981; Young and others, 1997. 

CG008 
Alaska Resource Data File 

Page 22 

Primary reference: Fields, 1977 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG008 
Alaska Resource Data File 

Page 23 

Site name(s): Unnamed (on coast near Ilnik) 

Site type: Occurrence 

ARDF no.: CG009 

Latitude: 56.6 Quadrangle: CG C-5 

Longitude: 159.6 

Location description and accuracy:

 This site represents beach placer deposits on the shore of Bristol Bay extending 3 miles 

to the southwest and 12 miles to the northeast of Ilnik Lake. 

Commodities: 

 Main: Fe, Ti 

 Other: 

Ore minerals: Ilmenite, magnetite 

Gangue minerals: 

Geologic description:

 The Ilnik beach deposit is a long spit bordering low-lying shallow swamps and mudflats. The mile-wide spit is capped by extensive dunes. The sediment is generally sand or 

loose gravel. Thin surface veneers of magnetite and ilmenite occur along the strand line as 

surf and wind concentrates. 

 Berryhill (1963) collected samples from 25 auger holes along approximately 15 miles of 

beach. Concentrates of this material contained 2.5 to 57.4 pounds of iron and 0.6 to 11.5 

pounds of titanium per cubic yard in the magnetic fraction. In the non-magnetic fraction 

the concentrates contained 0 to 2.1 pounds of titanium per cubic yard. 

Alteration:

 

Age of mineralization:

Quaternary. 

Deposit model:

Shoreline placer titanium (Cox and Singer, 1986; model 39c) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

39c 

CG009 
Alaska Resource Data File 

Page 24 

Production Status: None 

Site Status: Inactive 

Workings/exploration:

 Twenty-five auger holes were drilled and the resulting samples were concentrated and 

analysed for iron and titanium. The magnetic fraction contained 2.5 to 57.4 pounds of iron 

and 0.6 to 11.5 pounds of titanium per cubic yard. The non-magmetic fraction contained 0 

to 2.1 pounds titanium per cubic yard. 

Production notes:

 

Reserves:

 

Additional comments:

 This deposit is located on state land. 

References:

Berryhill, 1963. 

Primary reference: Berryhill, 1963 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG009 
Alaska Resource Data File 

Page 25 

Site name(s): Foot Bay 

Site type: Occurrence 

ARDF no.: CG010 

Latitude: 56.048 Quadrangle: CG A-3 

Longitude: 158.769 

Location description and accuracy:

 This mineral occurrence is insec. 2, T. 48 S., R. 61 W., of the Seward Meridian, approximately 2 miles west of Foot Bay, near the head of a small northeast-flowing drainage. The location is accurate to within 1/2 mile. 

Commodities: 

 Main: Cu 

 Other: Ag, Au, Mo 

Ore minerals: Chalcopyrite, molybdenite, pyrite 

Gangue minerals: 

Geologic description:

 This site is marked by a color anomaly which occupies an area of approximately 1/2 by 

1 mile along the northern contact zone of a small diorite stock (Fields, 1977). The stock 

intrudes siltstone, sandstone, grit, and conglomerate of the Cretaceous Hodoo Formation, 

which exhibits strong hornfelsing near the contact zone. 

 A peripheral pyrite-bearing fracture zone is present along the northern contact. The sulfide content in this zone is up to 5 percent, whereas the intrusive contains 1 percent or 

less sulfides (Fields, 1977). 

 Two rock samples collected by Bear Creek Mining Company in 1976 contained values 

of about 230 ppm copper and 2 ppm molybdenum along with traces of lead, zinc, and precious metals. One high-grade sample collected near the contact had metal values of 2300 

ppm copper, 1.9 ppm gold, 2 ppm molybdenum, and 4.6 ppm silver. 

Alteration:

 

Age of mineralization:

Tertiary. 

Deposit model:

Porphyry copper; porphyry copper-molybdenum (Cox and Singer, 1986; models 17, 21a) 

CG010 
Alaska Resource Data File 

Page 26 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

17, 21a 

Production Status: None 

Site Status: Inactive 

Workings/exploration:

 This site was briefly examined and sampled by Bear Creek Mining Company in 1976 

(Fields, 1977). Two of the rock samples contained about 230 ppm copper and 2 ppm molybdenum along with minor base and precious values. A high-grade sample collected near 

the contact had metal values of 2300 ppm copper, 1.9 ppm gold, 2 ppm molybdenum, and 

4.6 ppm silver. 

Production notes:

 

Reserves:

 

Additional comments:

 This mineral occurrence is located within the Alaska Peninsula National Wildlife Refuge. 

References:

Fields, 1977. 

Primary reference: Fields, 1977 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG010 
Alaska Resource Data File 

Page 27 

Site name(s): Home Creek 

Site type: Occurrence 

ARDF no.: CG011 

Latitude: 56.242 Quadrangle: CG A-3 

Longitude: 158.701 

Location description and accuracy:

 This site is located in sec. 31, T. 45 S., R. 60 W., of the Seward Meridian, approximately 2.5 miles northeast of Home Creek and 1 mile south of the Chignik River (Cox 

and others, 1981, locality 7). Location is accurate to within 1/2 mile. 

Commodities: 

 Main: Ag, Pb, Zn 

 Other: Cu, Mo 

Ore minerals: Chalcopyrite, galena, molybdenite, pyrite, sphalerite 

Gangue minerals: Quartz 

Geologic description:

 This occurrence is a large color anomaly up to 1.5 miles wide which extends approximately 4 miles northeast from Home Creek towards Chignik Lagoon (Fields, 1977). The 

color is coincident with an area of pyritization and propylitization which may be related to 

a Tertiary dacite dike (Detterman and others, 1981) having a similar trend. The altered 

rocks are part of the Tolstoi Formation of Eocene and Paleocene age. 

 Several large quartz veins, up to 10 feet wide, were discovered by Bear Creek Mining 

Company during the period 1975-1976 (Fields, 1977). These were observed to carry galena and rare pyrite. A chip sample contained 120 ppm copper, 6270 ppm lead, 11.6 ppm 

molybdenum, 19.2 ppm silver, and 1600 ppm zinc. Massive quartz float containing 

sphalerite and disseminated pyrite was reported by Resource Associates of Alaska in 

1979. It contained 490 ppm copper, 190 ppm lead, 5.5 ppm silver, and 4400 ppm zinc 

(Anderson and others, 1979). 

Alteration:

 Sedimentary units of the Tolstoi Formation exhibit propylitization. 

Age of mineralization:

Tertiary. 

CG011 
Alaska Resource Data File 

Page 28 

Deposit model:

Polymetallic vein (Cox and Singer, 1986; model 22c) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

22c 

Production Status: None 

Site Status: Inactive 

Workings/exploration:

 This occurrence was briefly examined by Bear Creek Mining Company in 1975-1976. 

A vein chip sample contained 120 ppm copper, 6270 ppm lead, 11.6 ppm molybdenum, 

19.2 ppm silver, and 1600 ppm zinc. Resource Associates of Alaska examined the area in 

1979. They reported massive quartz float that contained 490 ppm copper, 190 ppm lead, 

5.7 ppm silver, and 4400 ppm zinc. 

Production notes:

 

Reserves:

 

Additional comments:

 A part of this site is on land conveyed to or patented by the Bristol Bay Native Corporation. The remainder is within Alaska Peninsula National Wildlife Refuge. 

References:

Fields, 1977; Anderson and others, 1979; Cox and others, 1981; Detterman and others, 

1981. 

Primary reference: Fields, 1977 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG011 
Alaska Resource Data File 

Page 29 

Site name(s): Windy Bay 

Site type: Occurrence 

ARDF no.: CG012 

Latitude: 56.143 Quadrangle: CG A-3 

Longitude: 158.779 

Location description and accuracy:

 This site is approximately 2 miles west of the head of the north arm of Windy Bay and 

includes the headwaters of streams draining into that head of the bay (Cox and others, 

1981, locality 9). The site is accurate as plotted. 

Commodities: 

 Main: Cu, Mo 

 Other: Au, Pb, Zn 

Ore minerals: Chalcopyrite, galena, gold, molybdenite, pyrite, pyrrhotite, sphalerite 

Gangue minerals: Chlorite, quartz 

Geologic description:

 The geologic setting at this site consists of a quartz diorite stock which has intruded 

sedimentary units of the Jurassic Naknek Formation (Fields, 1977). These units include 

grits, graywacke, siliceous siltstone, and black shale. 

 A discontinuous color anomaly is present along the inferred contact zone (Fields, 1977). 

The sediments near the contact have been hornfelsed and contain pyrrhotite, pyrite, rare 

chalcopyrite, and magnetite as disseminations and as veinlet and fracture fillings. Total 

sulfide content is 1-5 percent. Sulfides occur up to 1000 feet from the contact. 

 The sulfide content of the intrusive is 1 percent or less. Chalcopyrite is present on fracture surfaces and in quartz-chlorite and pyrite veinlets. These strike approximately N 25 

W and cover an area of 1000 by 4000 feet. 

 Samples of the mineralized intrusive contained up to 424 ppm copper, 0.13 ppm gold, 

32 ppm lead, 25 ppm molybdenum, and 9 ppm zinc (Fields, 1977). 

 The intrusive exhibits local chloritization along with scattered patches of epidote and 

secondary biotite. The hornfelsed sediments have been silicified and contain secondary 

biotite and minor chlorite. 

Alteration:

 Alteration in the intrusive consists of local zones containing chlorite, epidote, and secondary biotite. The sediments near the intrusive contact have been hornfelsed, silicified, 

CG012 
Alaska Resource Data File 

Page 30 

and contain chlorite and secondary biotite. 

Age of mineralization:

Tertiary. 

Deposit model:

Porphyry copper; porphyry copper-gold; porphyry copper-molybdenum (Cox and Singer, 

1986; models 17, 20c, 21a) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

17, 20c, 21a 

Production Status: None 

Site Status: Inactive 

Workings/exploration:

 Bear Creek Mining Company briefly explored this site during the period 1975-1976. 

The few samples collected contained up to 424 ppm copper, 0.13 ppm gold, 32 ppm lead, 

25 ppm molybdenite, and 9 ppm zinc (Fields, 1977). 

 Resource Associates of Alaska briefly sampled this occurrence in 1979 (Anderson and 

others, 1979). 

Production notes:

 

Reserves:

 

Additional comments:

 This site is partially on land selected by the Bristol Bay Native Corporation. The remainder is within the Alaska Peninsula National Wildlife Refuge. 

References:

Fields, 1977; Anderson and others, 1979; Cox and others, 1981. 

Primary reference: Fields, 1977 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG012 
Alaska Resource Data File 

Page 31 

Site name(s): Unnamed (south of mouth of Fishhook Bay) 

Site type: Occurrence 

ARDF no.: CG013 

Latitude: 56.004 Quadrangle: CG A-2 

Longitude: 158.644 

Location description and accuracy:

 This occurrence is located in T. 48 S., R. 60 W., of the Seward Meridian, approximately 

1.3 miles south of the mouth of Fishook Bay. The location is accurate to within 1/2 mile. 

Commodities: 

 Main: Ag, Cu, Pb, Zn 

 Other: As, Sb 

Ore minerals: Arsenopyrite?, chalcopyrite?, galena?, pyrite, sphalerite? 

Gangue minerals: Quartz 

Geologic description:

 The rocks at this site consist of Cretaceous Hoodoo Formation cut by andesite dikes. 

The U.S. Geological Survey sampled a pyritic quartz vein which cuts hornfelsed siltstone 

of the Hoodoo Formation at this site (Angeloni and others, 1985). The width of the vein 

is unknown. The sample of vein material ran 200 ppm antimony, >10,000 ppm arsenic, 

1,500 ppm copper, 1,500 ppm lead, 150 ppm silver; and >10,000 ppm zinc. 

Alteration:

 

Age of mineralization:

Tertiary? 

Deposit model:

Polymetallic vein (Cox and Singer, 1986; model 22c) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

22c 

Production Status: None 

Site Status: Inactive 

CG013 
Alaska Resource Data File 

Page 32 

Workings/exploration:

 Rock sample (83AWs 57) of vein material collected by the U.S. Geological Survey contained 200 ppm antimony, >10,000 ppm arsenic, 1,500 ppm copper, 1,500 ppm lead, 150 

ppm silver, and >10,000 ppm zinc. 

Production notes:

 

Reserves:

 

Additional comments:

 This site is located within the Alaska Peninsula National Wildlife Refuge. 

References:

Angeloni and others, 1985. 

Primary reference: Angeloni and others, 1985 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG013 
Alaska Resource Data File 

Page 33 

Site name(s): Unnamed (near the head of Portage Bay) 

Site type: Occurrence 

ARDF no.: CG014 

Latitude: 56.21 Quadrangle: CG A-3 

Longitude: 158.61 

Location description and accuracy:

 This site is located near the head of Portage Bay (MacKevett and Holloway, 1977, locality 5). Site location is accurate to within 2 miles. 

Commodities: 

 Main: Cu 

 Other: Ag 

Ore minerals: 

Gangue minerals: 

Geologic description:

 The area is underlain by volcanic rocks of the Meshik Formation of Oligocene and Eocene ages (Detterman and others, 1981). MacKevett and Holloway (1977) indicate alteration and porphyry type mineralization possibly associated with Tertiary intrusives. 

Alteration:

 

Age of mineralization:

Tertiary. 

Deposit model:

Porphyry copper? (Cox and Singer, 1986; model 17) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

17? 

Production Status: None 

Site Status: Inactive 

Workings/exploration:

CG014 
Alaska Resource Data File 

Page 34 

 U.S. Bureau of Mines records indicate claims were staked on this occurrence in the 

mid-1960's. 

Production notes:

 

Reserves:

 

Additional comments:

 This site is located on land conveyed to or patented by the Bristol Bay Native Corporation. 

References:

U.S. Bureau of Mines, 1973; MacKevett and Holloway, 1977. 

Primary reference: MacKevett and Holloway, 1977 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG014 
Alaska Resource Data File 

Page 35 

Site name(s): Unnamed (at the head of Kuiukta Bay) 

Site type: Occurrence 

ARDF no.: CG015 

Latitude: 56.19 Quadrangle: CG A-2 

Longitude: 158.51 

Location description and accuracy:

 This occurrence is located in T. 46 S., R. 59 W., of the Seward Meridian. It is at the 

head of Kuiukta Bay (MacKevett and Holloway, 1977, locality 6). Site location is accurate to within 1 mile. 

Commodities: 

 Main: Cu 

 Other: Ag, Au, Pb 

Ore minerals: 

Gangue minerals: 

Geologic description:

 This site appears to be underlain by a Tertiary pluton (Detterman and others, 1981). 

MacKevett and Holloway (1977) suggest that this occurrence is a porphyry-type deposit 

associated with an altered Tertiary intrusion. The U.S. Bureau of Mines (1973) lists the 

commodities at this site as gold, lead, and silver and indicates that claims were active here 

during the mid-1960's. 

Alteration:

 

Age of mineralization:

Tertiary. 

Deposit model:

Porphyry copper? (Cox and Singer, 1986; model 17) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

17? 

Production Status: None 

CG015 
Alaska Resource Data File 

Page 36 

Site Status: Inactive 

Workings/exploration:

 There were active claims at this site in the mid-1960's (U.S. Bureau of Mines, 1973) 

Production notes:

 

Reserves:

 

Additional comments:

 This site is located within the Alaska Peninsula National Wildlife Refuge. 

References:

U.S. Bureau of Mines, 1973; MacKevett and Holloway, 1977. 

Primary reference: U.S. Bureau of Mines, 1973 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG015 
Alaska Resource Data File 

Page 37 

Site name(s): Unnamed (west of Bearskin Gulch) 

Site type: Occurrence 

ARDF no.: CG016 

Latitude: 56.2 Quadrangle: CG A-4 

Longitude: 159.1 

Location description and accuracy:

 The approximate location of this mineral occurrence is in T. 45 S., R. 63 W., of the Seward Meridian, 7 miles northwest of the headwaters of Clark River and 1 1/2 miles west 

of Bearskin Gulch (MacKevett and Holloway, 1977, locality 23). Site location is accurate 

to within 5 miles. 

Commodities: 

 Main: Cu? 

 Other: 

Ore minerals: 

Gangue minerals: 

Geologic description:

 This site has been described as a large altered zone in Tertiary intrusive rocks 

(MacKevett and Holloway, 1977). 

Alteration:

 

Age of mineralization:

Tertiary. 

Deposit model:

 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

 

Production Status: None 

Site Status: Inactive 

Workings/exploration:

 

CG016 
Alaska Resource Data File 

Page 38 

Production notes:

 

Reserves:

 

Additional comments:

 This mineral occurrence is located within the Alaska Peninsula National Wildlife Refuge. 

References:

MacKevett and Holloway, 1977. 

Primary reference: MacKevett and Holloway, 1977 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG016 
Alaska Resource Data File 

Page 39 

Site name(s): Unnamed (between arms of Castle Bay) 

Site type: Occurrence 

ARDF no.: CG017 

Latitude: 56.21 Quadrangle: CG A-1 

Longitude: 158.31 

Location description and accuracy:

 This site is located approximately on the point between the northwest and southwest 

arms of Castle Bay (MacKevett and Holloway, 1977, locality 26). Site location is accurate 

to within 2 miles. 

Commodities: 

 Main: Cu 

 Other: Ag, Mo 

Ore minerals: Chalcopyrite, molybdenite? 

Gangue minerals: 

Geologic description:

 This site is described as an altered zone in Tertiary intrusive and volcanic rocks 

(MacKevett and Holloway, 1977). Fields (1977) reports a 3/4-square-mile color anomaly 

associated with a small quartz diorite body in this general area. A silt sample collected by 

Bear Creek Mining Company from a northeast-flowing drainage approximately 1 mile 

west of the site as plotted contained 138 ppm copper and 3.4 ppm molybdenum. Sparse 

chalcopyrite was noted in quartz diorite boulders. 

Alteration:

 

Age of mineralization:

Tertiary. 

Deposit model:

Porphyry copper? (Cox and Singer, 1986; model 17) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

17? 

Production Status: None 

CG017 
Alaska Resource Data File 

Page 40 

Site Status: Inactive 

Workings/exploration:

 Bear Creek Mining Company did limited exploration at this occurrence during the period 1975-1976. 

Production notes:

 

Reserves:

 

Additional comments:

 This site is located on land conveyed to or patented by the Bristol Bay Native Corporation. 

References:

MacKevett and Holloway, 1977; Fields, 1977. 

Primary reference: Fields, 1977 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG017 
Alaska Resource Data File 

Page 41 

Site name(s): Unnamed (in Knife Peak area) 

Site type: Occurrence 

ARDF no.: CG018 

Latitude: 56.27 Quadrangle: CG B4 

Longitude: 159.09 

Location description and accuracy:

 This site is located on or near Knife Peak, approximately 8 miles west of Chignik Lake 

(MacKevett and Holloway, 1977, locality 24). Site location is accurate to within 2 miles. 

Commodities: 

 Main: Cu? 

 Other: 

Ore minerals: 

Gangue minerals: 

Geologic description:

 This site is marked by a color anomaly approximately 1 by 3 miles in extent (Cox and 

others, 1981). It has been described as a porphyry-type occurrence in Tertiary intrusive 

rocks (MacKevett and Holloway, 1977). This occurrence may be related to a dacite plug 

dome (Detterman and others, 1981). Nearby drainages are anomalous in tin and zinc. 

Alteration:

 

Age of mineralization:

Tertiary. 

Deposit model:

Porphyry copper? (Cox and Singer, 1986; model 17) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

17? 

Production Status: None 

Site Status: Inactive 

CG018 
Alaska Resource Data File 

Page 42 

Workings/exploration:

 

Production notes:

 

Reserves:

 

Additional comments:

 This site is located within the Alaska Peninsula National Wildlife Refuge. 

References:

MacKevett and Holloway, 1977. 

Primary reference: MacKevett and Holloway, 1977 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG018 
Alaska Resource Data File 

Page 43 

Site name(s): Unnamed (west of Hook Bay) 

Site type: Occurrence 

ARDF no.: CG019 

Latitude: 56.5 Quadrangle: CG C1 

Longitude: 158.2 

Location description and accuracy:

 The approximate location of this site is in T. 42 S., R. 57 W., of the Seward Meridian, 

several miles west of Hook Bay (MacKevett and Holloway, 1977, locality 25). It may be a 

part of the Weasel Mountain prospect (CG008). Location is accurate to within 3 miles. 

Commodities: 

 Main: Cu, Zn 

 Other: 

Ore minerals: 

Gangue minerals: 

Geologic description:

 This site is described as a porphyry-type occurrence represented by altered zones in 

sedimentary rocks of the Jurassic Naknek Formation and in Tertiary diorite and dacite 

(MacKevett and Holloway, 1977; Detterman and others, 1981). 

Alteration:

 

Age of mineralization:

Tertiary. 

Deposit model:

Porphyry copper? (Cox and Singer, 1986; model 17) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

17? 

Production Status: None 

Site Status: Inactive 

CG019 
Alaska Resource Data File 

Page 44 

Workings/exploration:

 

Production notes:

 

Reserves:

 

Additional comments:

 Depending on exact location this site may be on lands selected by the Bristol Bay Native Corporation or may be within the Alaska Peninsula National Wildlife Refuge. 

References:

MacKevett and Holloway, 1977; Detterman ans others, 1981. 

Primary reference: MacKevett and Holloway, 1977 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG019 
Alaska Resource Data File 

Page 45 

Site name(s): Unnamed (Between Portage Bay and Chignik Lake) 

Site type: Occurrence 

ARDF no.: CG020 

Latitude: 56.2 Quadrangle: CG A-3 

Longitude: 158.7 

Location description and accuracy:

 This site's approximate location is between Portage Bay and Chignik Lake in T. 46 S., 

R. 60 W., of the Seward Meridian (MacKevett and Holloway, 1977, locality 22). This site 

may be related to or part of the Home Creek occurrence (CG011). The site location as 

plotted is accurate to within 3 miles. 

Commodities: 

 Main: Cu? 

 Other: 

Ore minerals: 

Gangue minerals: 

Geologic description:

 This site has been described as consisting of extensive altered zones in composite Tertiary plutons which are weakly mineralized (MacKevett and Holloway, 1977). 

Alteration:

 

Age of mineralization:

Tertiary. 

Deposit model:

Porphyry copper? (Cox and Singer, 1986; model 17) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

17? 

Production Status: None 

Site Status: Inactive 

CG020 
Alaska Resource Data File 

Page 46 

Workings/exploration:

 

Production notes:

 

Reserves:

 

Additional comments:

 Depending on its exact location this site may be located on land conveyed to or patented 

by the Bristol Bay Native Corporation or it may be within the Alaska Peninsula National 

Wildlife Refuge. 

References:

MacKevett and Holloway, 1977. 

Primary reference: MacKevett and Holloway, 1977 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG020 
Alaska Resource Data File 

Page 47 

Site name(s): Unnamed (on Braided Creek) 

Site type: Prospect 

ARDF no.: CG021 

Latitude: 56.5 Quadrangle: CG C-2 

Longitude: 158.5 

Location description and accuracy:

 This site consists of gold placer claims whose approximate location is on Braided Creek 

in T. 42 S., R. 58 W., of the Seward Meridian (MacKevett and Holloway, 1977, locality 

20). Site location is accurate to within 3 miles. 

Commodities: 

 Main: Au 

 Other: 

Ore minerals: Gold 

Gangue minerals: 

Geologic description:

 This site represents gold placer claims indicated on 1973 U.S. Bureau of Mines maps. 

Alteration:

 

Age of mineralization:

Quaternary. 

Deposit model:

Placer gold-PGE (Cox and Singer, 1986; model 39a) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

39a 

Production Status: Undetermined. 

Site Status: Inactive 

Workings/exploration:

 There has been no post-1950 activity. 

CG021 
Alaska Resource Data File 

Page 48 

Production notes:

 

Reserves:

 

Additional comments:

 This site is located within the Alaska Peninsula National Wildlife Refuge. 

References:

MacKevett and Holloway, 1977; U.S. Bureau of Mines, 1973. 

Primary reference: MacKevett and Holloway, 1977 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG021 
Alaska Resource Data File 

Page 49 

Site name(s): Unnamed (south of Chignik) 

Site type: Occurrence 

ARDF no.: CG022 

Latitude: 56.27 Quadrangle: CG B-2 

Longitude: 158.39 

Location description and accuracy:

 The approximate location of this occurrence is 1.5 miles south of the village of Chignik 

(Fields, 1977, locality 8). Site is accurate to within 2 miles. 

Commodities: 

 Main: 

 Other: 

Ore minerals: Pyrite, pyrrhotite 

Gangue minerals: 

Geologic description:

 This site represents a 3-square-mile color anomaly which generally corresponds in location to a Tertiary quartz diorite stock containing up to 0.25 percent disseminated pyrite. 

The stock cuts sedimentary rocks of the Tolstoy Formation (Eocene and Paleocene age). 

The siltstones and sandstones near the intrusive are hornfelsed and carry up to 5 percent 

pyrrhotite (Fields, 1977). 

Alteration:

 

Age of mineralization:

Tertiary. 

Deposit model:

Porphyry copper? (Cox and Singer, 1986; model 17) 

Deposit model number (After Cox and Singer, 1986 or Bliss, 1992):

17? 

Production Status: None 

Site Status: Inactive 

CG022 
Alaska Resource Data File 

Page 50 

Workings/exploration:

 The area was examined by Bear Creek Mining Company during the period 1975-1976 

(Fields, 1977). 

Production notes:

 

Reserves:

 

Additional comments:

 This site is located on land conveyed to or patented by the Bristol Bay Native Corporation. 

References:

Fields, 1977. 

Primary reference: Fields, 1977 

Reporter(s): S.H. Pilcher (Anchorage) 

Last report date: 2/8/00 

CG022 
Alaska Resource Data File 

Page 51 

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 Mining Claims, Alaska Peninsula, 1 map sheet, scale 1:1,000,000. 

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Anderson, G.D., Fitch, G.M., Lappie, D.W., Lindberg, P.A., and Fankhauser, R.E., 1979, Exploration and evaluation of Bristol Bay Native Corporation Lands, Vol. II, Book 1: prepared for Houston Oil and Minerals 

Company by Resource Associates of Alaska, 78 p. (held by Alaska Earth Science). 

Angeloni, L.M., Wilson, F.H., and Sutley, S., 1985, Map and tables showing preliminary rock geochemical data, 

Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey OpenFile Report 85-470, 179 p., 1 map sheet, scale 1:250,000. 

Atwood, W. W., 1909, Mineral resources of southwest Alaska, in Brooks, A.H., and others, Mineral resources of 

Alaska in 1908: U.S. Geological Survey Bulletin 379, 411 p. 

Atwood, W. W., 1911, Geology and mineral resources of parts of the Alaska Peninsula: U.S. Geological Survey 

Bulletin 467, 137 p. 

Berryhill, R.V., 1963, Reconnaissance of beach sands, Bristol Bay, Alaska: U.S. Bureau of Mines Report of Investigations 6214, 48 p. 

Berg, H.C., and Cobb. E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 

254 p. 

Brown, D.L., Crabtree, E.H., and Smith, F.L., 1965, Mineralogic study of a complex sulfide deposit, vein number 

1, project Manhatten, Alaska: Prepared for Pan American Petroleum Corporation by The Colorado 

School of Mines Foundation Inc., 55 p. (held by Alaska Earth Science). 

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industry in 1983: Alaska Division of Geological and Geophysical Surveys Special Report 33, 56 p. 

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evaluation of precious metal potential of Bristol Bay Native Corporation Lands, southwest Alaska, 1981, 

Vol. 1: prepared for Nerco by Resource Associates of Alaska, 90 p. (held by Alaska Earth Science). 

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from published reports of federal and state agencies through 1959: U.S. Geological Survey Bulletin 

1139, 363 p. 

Cobb, E.H., 1972, Metallic mineral resource map of the Chignik quadrangle, Alaska: U. S. Geological Survey 

Map MF-374, 1 map sheet, scale 1:250,000. 

Cobb, E.H., 1973, Placer deposits of Alaska: U.S. Geological Survey Bulletin 1374, 213 p. 

Cobb, E. H., 1980, Summaries of data on and lists of references to metallic and selected non-metallic mineral deposits in fifteen quadrangles in southwestern and west-central Alaska: U.S. Geological Survey Open-File 

Report 80-909, 103 p. 

Cox, D.P., Detra, D.E., and Detterman, R.L., 1981, Mineral resource maps of the Chignik and Sutwik Island 

quadrangles, Alaska: U.S. Geological Survey Map MF- 1053K, 2 map sheets, scale 1:250,000. 

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Page 52 

Cox, D.P., and Singer, D.A., eds., 1986, Mineral deposit models: U.S. Geological Survey 

Bulletin 1693, 379 p. 

Detterman, R.L., Miller, T.P., Yount, M.E., and Wilson, F.H.,1981, Geologic map the Chignik and Sutwik Island 

quadrangles Alaska: U.S. Geologic Survey Map I- 1229, 1 map sheet, scale 1:250,000. 

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Knappen, R.S., 1929, Geology and mineral resources of the Aniakchak District, in Smith, P.S., and others, Mineral Resources of Alaska in 1926: U.S. Geological Survey Bulletin 797, 227 p. 

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Nokleberg, W.J., Bundtzen, T.K., Berg, H.C., Brew, D.A., Grybeck, D., Robinson, M.S., Smith, T.E., and Yeend, 

W., 1987, Significant metallferous lode and placer deposits of Alaska; U.S. Geological Survey Bulletin 

1786, 104 p. 

Ransome, A.L., and Kerns, W.H., 1954, Names and definitions of regions, districts, and subdistricts in Alaska: U.

S. Bureau of Mines Information Circular 7679, 91 p. 

Sillitoe, R.H., 1990, Metallogenetic setting and gold potential of the Chignik and Iliamna regions, Alaska Peninsula: A report prepared for Western Gold Exploration and Mining Company Limited, 9 p.(held by 

Alaska Earth Science). 

Smith, W.R., and Baker, A.H., 1924, The Cold Bay-Chignik district, in Brooks, A.H., and others, Mineral resources of Alaska in 1922: U.S. Geological Survey Bulletin 755, 222 p. 

U.S. Bureau of Mines, 1973, Quadrangle map overlays showing mineral deposit locations in Alaska: U.S. Bureau 

of Mines Open-File Report 20-73, 95 map sheets, scale 1:250,000. 

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4 map sheets, scales 1:250,000 and 1000 feet to the inch. 

Wilson, F.H., and Cox, D.P., 1983, Geochronology, geochemistry, and tectonic environment of porphyry mineralization in the central Alaska Peninsula: U.S. Geological Survey Open-File Report 83-783, 24 p. 

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References