SANTIAGO, May 23 (Reuters) - Workers at BHP Billiton's BHP.AX BLT.L Spence mine in northern Chile went on a 24-strike on Monday due to a contractual dispute, a union official told Reuters.
Workers there previously went on a 24-hour strike earlier in May, as the union demanded improvements in labor conditions and to protest alleged contract breaches. Spence produced 175,600 tonnes of copper in 2015.