Critical Minerals Factbook
Deposit

Burgdorf-Warren Monazite Placer District

Burgdorf-Warren 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 (45.290, -115.701 approx.)

Commodities: rare earth elements (in monazite); gold; thorium; uranium

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)Unclassified39,500 t4.46111 percent1,550 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.
uranium oxide (U3O8)Unclassified77.1 t—65.5 metric tons UJan 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.
total rare-earth oxide (TREO)Unclassified24,900 t—24,900 metric tons TREOJan 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.

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

Sources