Tantalum is a metal in group VB of the periodic table with atomic number 73, an atomic weight of 180.95, and a density of 16.6 Mg/m 3. Its melting point is 2996 C, and it boils at 5425 C. In the solid ...

In the New Year's Eve under control The Armed Forces of Russia in the village of Shevchenko in DNR is one of the largest ...

He also discusses the bloody history behind the mining of their ore in the heart of Africa with Sophia Pickles of human rights organisation Global Witness. And the BBC challenges the Rwandan ...

The price of coltan depends on how much tantalum it contains, but on average, a kilogram of the rare ore fetches $48 (£37), according to Forbes. Analysts say the international demand for coltan ...