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Sliscovich

Producer in Alaska, United States with commodities Gold, Antimony, Silver, Arsenic
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10308934
MRDS ID A012805
Record type Site
Current site name Sliscovich
Related records 10136060, 10001963

Geographic coordinates

Geographic coordinates: -165.31519, 64.75949 (WGS84)
Relative position The Sliscovich claims extend north-northeast for about 1.5 miles from the gentle ridge between Cold and Manila Creeks into the head of Manila Creek. From southwest to northeast the claims are the Greater Alaska, My Best Lode, Sliscovich Discovery, Nasradin and Distin claims (two wide), and Discovery and Manilla Extension Lodes (two wide). The claims correspond generally with localities 15 and 16 of Hummel (1962 [MF 248]). The location used here is approximately the end line between Sliscovich Discovery and Distin lode claims (U.S. Mineral Survey No. 1380). The location is accurate to 0.1 mile of the coordinates. It is locality 28 of Cobb (1972 [MF 46], 1978 [OFR 78-93]).

Site location context

Political divisions (FIPS codes)

Nome(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Nome D-1(quadrangle 1:63,360 scale)

Solomon NW(quadrangle 1:100,000 scale)

Nome(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Nome(hydrologic unit)

Norton Sound(hydrologic accounting unit)

Northwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Antimony Critical Primary
Silver Secondary
Arsenic Critical Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Gold Ore
Pyrite Ore
Stibnite Ore
Albite Gangue
Ankerite Gangue
Quartz Gangue

Alteration

  • Chapin (1914, p. 404) reported that the footwall was strongly bleached for about 15 inches and converted to quartz and sericite with fine-grained white pyrite (arsenopyrite?). The hanging wall was silicified. D. Simpson (Bear Creek Mining Company, written communication, 1984) found that the footwall schist was sheared, and altered and carried small amounts of arsenopyrite.

Mineral occurrence model information

Model code 180
USGS model code 27d
Deposit model name Simple Sb (veins, pods, etc)

Nearby scientific data

(1) -165.31519, 64.75949
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = At least two distinctive types of mineral deposits occur on the Sliscovich claim block. A vein, probably continuous with mineralization at the Breen East prospect (NM085), strikes about east-west and appears to trend onto the southwest part of the My Best Lode claim, where it was opened by adits and trenches. Farther southwest, stibnite-bearing veins near a contact between metasedimentary schist and marble are subparallel to the alignment of the Sliscovich Discovery claim, and stibnite float is found at or below this contact for the length of the claim. Workings in the northeast part of the Sliscovich Discovery claim are, at least in part, on the contact of metasedimentary schist underlying marble (D. Simpson, Bear Creek Mining Company, written communication, 1984). The contact zone on the Sliscovich Discovery claim was probably developed when the property was visited by Chapin in 1913 (Chapin, 1914, p. 403-404). Chapin described the occurrence as a quartz-stibnite vein that strikes N 60 E and dips 45 degrees northwest. Stibnite was mostly on the footwall, but it also occurred as veins and nests in quartz (Cathcart, 1922). Gouge and slickensides were locally present on both footwall and hanging wall (Mertie, 1918 [B 662-I, p. 425-449]). The vein was developed by a 315-foot adit, a drift on the lode, and an incline from the drift. A 70-foot-long part of the lode was mined for antimony in 1915 from the incline workings. In general, the vein that remained was only a few inches wide, but Cathcart (1922, p. 230) found one section about 45 inches thick that consisted of 13 inches of stibnite and 32 inches of opaque quartz. The vein was similar to that at the Hed & [and] Strand mine (NM070) with most of the quartz on the hanging wall. Massive stibnite-quartz float occurs on the My Best Lode claim and appears to be from the same vein developed on the Breen West claims (NM087). Cathcart (1922) reported some steeply dipping quartz veinlets with northeast strike. A small ore shipment reported by Chapin (1914) contained about 35 percent antimony; gold and silver were present, but their values were not reported. An 88-ton ore shipment in 1915 returned most of its value in gold (Mertie, 1918). Gold values obtained by Bear Creek Mining locally exceeded 1 ounce per ton. Gamble and others (1985, p. 28) reported that antimony-rich samples contained 4.4 to 6.5 ppm gold, 2 to 7 ppm silver, and 100 to 250 ppm arsenic. The Sliscovich mine is in metasedimentary schist near an overlying marble. A granitic orthogniess is mapped upslope to the north (Hummel, 1962 [MF 248]). The metamorphic rocks are part of the Nome Group, which is derived from Proterozoic to early Paleozoic protoliths (Till and Dumoulin, 1994). The Nome Group underwent regional blueschist facies metamorphism in the Late Jurassic or Early Cretaceous (Sainsbury, Coleman, and Kachadoorian, 1970; Forbes and others, 1984; Thurston, 1985; Armstrong and others, 1986; Hannula and McWilliams, 1995). The blueschist facies rocks were recrystallized to greenschist facies or higher metamorphic grades in conjunction with regional extension, crustal melting, and magmatism in the mid-Cretaceous (Hudson and Arth, 1983; Miller and Hudson, 1991; Miller and others, 1992; Dumitru and others, 1995; Hannula and others, 1995; Hudson, 1994; Amato and others, 1994; Amato and Wright, 1997, 1998). Lode gold mineralization on Seward Peninsula is mostly related to the higher temperature metamorphism in the mid-Cretaceous (Apodoca, 1994; Ford, 1993 [thesis]; Ford and Snee, 1996; Goldfarb and others, 1997). The antimony-gold deposits are probably of about the same age.
  • Age = Mid-Cretaceous; controlled by structures that post-date regional metamorphism; may be same age as some lode gold deposits of Seward Peninsula.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic

Comments on exploration

  • Status = Active?

Mining district

District name Nome

Comments on the production information

  • Production Notes = A small ore shipment reported by Chapin (1914) contained about 35 percent antimony; gold and silver were present, but their values were not reported. An 88-ton ore shipment in 1915 returned most of its value in gold (Mertie, 1918 [B 662-I, p. 425-449]). Gold values obtained by Bear Creek Mining locally exceeded 1 ounce per ton. Gamble and others (1985, p. 28) reported that antimony-rich samples contained 4.4 to 6.5 ppm gold, 2 to 7 ppm silver, and 100 to 250 ppm arsenic.

Comments on the workings information

  • Workings / Exploration = The claims of the Sliscovich group were located between June 20, 1907, and January 1, 1917, and were patented to James F. Halpin in 1924. According to Chapin (1914, p. 403-404), at least one claim was located as early as 1905. The Sliscovich Discovery claim was developed by 315-foot adit and an incline driven 100 feet along the vein. Stibnite was mined from a 70-foot-long stope. These workings were driven in 1915 or before. The My Best Lode claim also has mine workings. The area was explored by Mapco in about 1981-82. The Sliscovich claims were mapped during Bear Creek Mining's option of the Breen claims (D. Simpson, written communication, 1984). Subsequently the area was studied by BHP (Ford, 1993 [thesis]). The area is within an extensive east-west, gold and arsenic soil anomaly identified by BHP.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Chapin, 1914

General comments

Subject category Comment text
Deposit Model Name = Simple Sb deposits and low sulfide, Au-quartz vein? (Cox and Singer, 1986; models 27a and 36a).
Deposit Model Number = 27d?, 36a?

Reporter information

Type Date Name Affiliation Comment
Reporter 22-OCT-99 Hawley, C.C. and Hudson, Travis L. Hawley Resource Group

Beyond USGS

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

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.