A United Nations report says Rwanda provided critical support to the M23 rebels who seized key cities earlier this year in ...

In this paper we review the crystal chemistry and structure data from the literature and our results reported in the last decade for natural and synthetic samples of the tantalite-columbite series.

Ercit, T.S., Wise, M.A. and Cerny, P. (1995) Compositional and Structural Systematics of the Columbite Group. American Mineralogist, 80, 613-619.

However, production remains low, with only 80 tonnes of combined columbite-tantalite and cassiterite concentrate produced--containing around 4 tonnes of tantalum and 35 tonnes of tin.

In addition to the REE mineralogy, the QEMSCAN results confirm that niobium is hosted in columbite, particularly in CK-12 where columbite comprises over 99% of the total niobium content.

Prospecting for rare-earth minerals at the proposed Sheep Creek mine south of Darby will continue in 2025.

Moroto, Uganda | THE INDEPENDENT | Karamoja Minerals’ airborne geophysical and geological mapping indicates that the region has more than 300 million tons of Limestone/Marble in Moroto, Kotido and ...

The mining firm will deal in the exploration and mining of monoxide, Tin/columbite, Zircon and other rare earth elements in Toro and Dass Local Government Area.

Kula Gold has formed a joint venture to acquire the Wozi niobium and tantalum project on the prospective African Rift Belt in Malawi, in south-east Africa. The project presents historic surface ...

As the DRC brings an unprecedented case against Apple, and the company offers assurances that it will no longer use conflict minerals from central Africa, experts are questioning whether real ...

This tale begins with a mineral called columbite, the occurrence of which in the United States was presumably discovered by John Winthrop the Younger, an early governor of the Connecticut Colony ...