Chinese refined metal imports have been trending lower since the start of the year and continued doing so in April.

The six-year investment blueprint includes a $2.3bn expansion to existing smelting capacity in Sonora and $815m for major new electricity lines for the Baja California peninsula.

The Iron Creek project is one of the few primary cobalt deposits in the world.

Canada's DeepGreen Metals among the companies planning to mine oceans for battery metals.

The University of Nottingham, Terra Motion and Geospatial Insight are making a tailings dam motion monitor service available to miners.

Add sulfuric acid to the list of challenges facing copper miners as the world clamors for more of the wiring metal.