Copper gained for a second day in London on concern that a labor dispute at a mine in Chile, the world’s largest producer of the metal used in pipes and wires, may disrupt supply.
A union at the Cerro Colorado copper mine in Chile voted yesterday to strike as part of wage negotiations with BHP Billiton [...]

Copper gained for a second day in London on speculation that a labor dispute at a mine in Chile, the world’s largest producer of the metal, may disrupt supply.
A union at the Cerro Colorado copper mine voted yesterday to strike as part of wage negotiations with BHP Billiton Ltd., the world’s biggest mining company. Supply [...]