Graphite Creek

Location: Alaska, United States (65.039, -165.539 approx.)

Commodities: graphite

Deposit model: 37f - Disseminated flake graphite

Tracked facility at this deposit: Graphite One Graphite Creek Project

Geology

Disseminated flakes of graphite, up to 1 mm or more across, make up several percent of the rock. (King and others (2019)) There are two distinctive graphite-bearing schist intervals at Graphite Creek. The first is quartz-biotite-garnet-sillimanite schist that contains coarse, semi-massive and massive graphite segregations. The other interval unit is quartz-biotite schist that typically contains disseminated graphite. The quartz-biotite-garnet-sillimanite schist is the principal host to higher grade graphite and makes up two distinctive layers in the metasedimentary sequence along the north flank of the Kigluaik Mountains. A third potential horizon is defined by ''pods'' of quartz-biotite-garnet-sillimanite schist. (King and others (2019))

Published resource estimates

As compiled by USGS USMIN from the cited studies. Resource classes follow the source; "approximate" flags values USMIN reports as approximations. These are not current company reserve statements.

Recorded production

• Graphite Creek, Christophosen Creek mine: produced 390 metric tons of graphite, 1912–1916. Mat_Amnt represents two periods of production, in 1912: 130 tons, and in 1916: 300 tons (Coats (1944), Pages 1-2 — Coats, R.R., 1944, Graphite deposits on the north side of the Kigluaik Mountains, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 44-25, 10 p., https://doi.org/10.3133/ofr4425.)
• Graphite Creek, Graphite Creek mine: produced 122 metric tons of graphite, 1907–1916. Mat_Amnt represents two periods of production, in 1907: 35 tons, and in 1916 about 100 tons (Coats (1944), Page 1 — Coats, R.R., 1944, Graphite deposits on the north side of the Kigluaik Mountains, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 44-25, 10 p., https://doi.org/10.3133/ofr4425.)

Exploration and site history

• Active — Intermittent production of graphite by Uncle Same Alaska Mining Syndicate, 1912–1916 (Coats (1944))
• Active — Intermittent production of graphite by Alaska Graphite Mining Company, 1907–1917 (Coats (1944))
• Evaluation — NI 43-101 compliant report published, 2019 (King and others (2019))
• Evaluation — NI 43-101 compliant report published, 2013 (Duplessis and others (2013))
• Discovery — Discovery is considered 1900 when the first claims were staked at the site, 1900 (Coats (1944))
• Evaluation — NI 43-101 compliant report published, 2015 (Eccles and others (2015))
• Exploration — Exploration has consisted of mapping, sampling, airborne geophysical surveys, drilling, and bench-scale beneficiation testing, 2001–2018 (King and others (2019))
• Evaluation — NI 43-101 compliant report published, 2014 (Eccles and Nicholls (2014))
• Evaluation — NI 43-101 compliant report published, 2017 (Robinson and others (2017))

Record imported from USGS USMIN ver. 4.0 (June 2019). Developments after that date appear on facility records, not here; see the methodology.