Deposit

Frontier Formation-Spring Gap

Frontier Formation-Spring Gap is a rare earth occurrence in Wyoming, 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: Wyoming, United States (41.380, -110.635 approx.)

Commodities: heavy minerals; rare earth elements

Deposit model: paleo beach placer · unclassified

Geology

The same altered Frontier Formation sandstone in section 30 [other Spring Gap entry], crops out here… (Sutherland and Cola (2016))

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