Deposit

Boulogne

Boulogne is a deposit with published resource estimates in Florida, 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: Florida, United States (30.741, -81.985 approx.)

Commodities: titanium; zircon; rare earth elements (in monazite)

Deposit model: coastal heavy-mineral sands

Geology

The deposit itself encompassed the central part of a ridge trending nearly north-south, and reaching a width of 1.9 km and a length of more than 5.3 km. (Elsner (1997))

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.

Material	Class	Amount	Grade	Contained	As of	Reference
heavy minerals	Unclassified	26,325,000 t	3.4 percent	895,000 metric tons heavy minerals	Jan 1, 1992	Elsner (1997), Page 20, Table 7 — Elsner, H., 1997, Economic geology of the heavy mineral placer deposits in northeastern Florida: Open-File Report 71, Florida Geological Survey, 142 p.

Recorded production

Boulogne, Boulougne Mine: produced 16,316,745 metric tons of heavy minerals at 3.75 percent, containing about 612,000 metric tons heavy minerals, 1974–1979 (Elsner (1997), Page 20, Table 7)

Exploration and site history

Active — Operated by Humphreys Mining Co.; Products were titanium product, zircon, and monazite, 1974–1979 (Elsner (1997))

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