GRADE AND TONNAGE MODEL OF CARBONATITE DEPOSITS

By Donald A. Singer

COMMENTS Locally these carbonatite complexes may contain economically interesting grades of uranium, thorium, titanium, iron, copper, vermiculite, zirconium or phosphorus; frequently, these other commodities are in different zones than the niobium-rich parts of the complex. See figs. 30, 31.

Figure 30. Tonnages of carbonatite deposits.

Figure 31. Grades of carbonatite deposits. A, Niobium. B, Rare-earth oxides.

DEPOSITS

Name Country

Araxa BRZL

Bingo ZIRE

Dominion Gulf CNON

Catalao BRZL

Iron Hill USCO

James Bay CNON

Lueshe ZIRE

Mbeya TNZN

Martison Lake CNON

Manitou Island CNON

Mountain Pass USCA

Mrima Hill KNYA

Nemogos (Lackner Lake) CNON

Oka CNQU

Salitre BRZL

Serra Negra BRZL

Sove NRWY

Sukula UGND

St. Honore (Soquem) CNQU

Tapira BRZL