Critical Minerals Factbook
Deposit

Boise Basin Monazite Placer District

Boise Basin Monazite Placer District is a deposit with published resource estimates in Idaho, 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: Idaho, United States (43.854, -115.859 approx.)

Commodities: rare earth elements (in monazite); garnet; ilmenite; thorium; zircon

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.

MaterialClassAmountGradeContainedAs ofReference
thorium oxide (ThO2)Unclassified18,800 t3.19111 percent526.1 metric tons ThJan 1, 1980Staatz and others (1980), Page 17 — Staatz, M.H., Hall, R.B., Macke, D.L., Armbrustmacher, T.J., and Brownfield, I.K., 1980, Thorium resources of selected regions in the United States: U.S. Geological Survey Circular 824, 32 p.
ilmenite (FeTiO3)Unclassified67,800 t—19,800 metric tons TiJan 1, 1980Staatz and others (1980), Page 18 — Staatz, M.H., Hall, R.B., Macke, D.L., Armbrustmacher, T.J., and Brownfield, I.K., 1980, Thorium resources of selected regions in the United States: U.S. Geological Survey Circular 824, 32 p.
garnetUnclassified24,700 t—24,700 metric tons garnetJan 1, 1980Staatz and others (1980), Page 18 — Staatz, M.H., Hall, R.B., Macke, D.L., Armbrustmacher, T.J., and Brownfield, I.K., 1980, Thorium resources of selected regions in the United States: U.S. Geological Survey Circular 824, 32 p.
zircon (ZrSiO4)Unclassified24,800 t—12,300 metric tons ZrJan 1, 1980Staatz and others (1980), Page 18 — Staatz, M.H., Hall, R.B., Macke, D.L., Armbrustmacher, T.J., and Brownfield, I.K., 1980, Thorium resources of selected regions in the United States: U.S. Geological Survey Circular 824, 32 p.

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

Sources