Deposit

Unnamed (near Swift River)

Unnamed (near Swift River) is a rare earth occurrence in Alaska, recorded in the USGS USMIN rare earth element occurrence database (ver. 4.0, June 2019).

Facts on this page last re-verified Aug 12, 2026 — the oldest verification date among its current claims. How we verify.

Location: Alaska, United States (61.455, -154.109 approx.)

Commodities: rare earth elements

Deposit model: disseminated REE in granite · unclassified

Geology

The plutonic rocks are in large part leucocratic and of granitic composition. The color index (chiefly biotite) ranges, in general, between 3 and 10. Coarse-grained to very coarse-grained biotite granite and biotite quartz monzonite are the chief rock types noted. The two samples of biotite granite from the southeast and northwest borders of the intense magnetic anomaly (Lime Hills B-3 and C-A quadrangles, Figs. 2 and 3) are interesting in that they contain abundant accessory allanite. These samples also contain monazite and/or xenotime, which are also characteristic accessory minerals in granite and quartz monzonite samples from the main batholitic mass. (Reed and Anderson (1969))

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

Sources

U.S. Geological Survey · published Jun 1, 2019 · retrieved Aug 12, 2026 · archive unavailable: Wayback snapshot 20260427015518 of the ScienceBase item exists but the archive service returned 503 on verification 2026-08-12; recheck on a weekly pass