They have worked with oxides of iron, aluminium, zirconium, titanium and copper.

ECONOMIST: Bunker-busting

Helium-cooled superconducting coils, typically made of an alloy of niobium and titanium encased in copper cladding, create magnetic fields ten times stronger than similar-size permanent magnets can muster.

ECONOMIST: Inside story

The sludge inside the tank contains chunks of solids, many common metals including aluminum, nickel, lead, silver, copper, titanium, and zinc and other common elements.

FORBES: What's Inside The Suspect Nuclear Waste Tank At Hanford?

The Company has interests in mining for aluminum, borax, coal, copper, gold, iron ore, lead, silver, tin, uranium, zinc, titanium, dioxide feedstock, diamonds, talc and zircon.

FORBES: Guru Stocks at 52-Week Lows: VALE, RIO, FB, AAUKY, HPQ