Yellen’s comments kick off two days of meetings in Beijing for the US Treasury chief.

Environmental groups expect next week's meeting of the International Seabed Authority to rule out any immediate permission for mining to begin.

While precious metals-focused juniors are working to revive Nevada’s tired Tonopah Silver District, lithium discoveries to the north, west and south of the desert town’s doorstep could again kick the boom-bust local economy into high gear.

The company's flagship project is the exploration-stage Kabanga in Tanzania.

The agreement establishes a 10-year offtake contract for minerals that NioCorp aims to produce at its Elk Creek project.

China announced export restrictions on the two metals used in semiconductors.

The United States "firmly" opposes export controls announced by China on gallium and germanium, a US Commerce Department spokesperson said.

China said on Monday it will impose export restrictions on gallium and germanium.