Location:

River placer. Jos Plateau, Nigeria

The samples are concentrates from river placers derived from Nigerian tin-tungsten-bearing granites. The primary mineralization of the granites is very similar to that of Ririwai.

Major Minerals:

Cassiterite, wolframite, columbite, zircon, thorite

Minor Minerals:

Ilmenite, xenotime, haematite, monazite

Trace Minerals:

Include galena, sphalerite, pyrite

Textures:

The primary oxides have suffered little alteration other than thin oxidation rims of haematite and TiO2, minerals about ilmenite. Twinned cassiterite carries small columbite inclusions

References:

Mackay et al., 1949; MacLeod et al., 1971; Kinnaird, 1984