Escondida and Spence copper mines in Chile, owned by BHP Billiton, face the threat of strike May 11,2021 07:03 CST Source:Mandarin Finance and Economics [the Escondida and Spence copper mines of BHP Billiton face the threat of strike] the union chairman said on Monday that the union representing workers at BHP Billiton's Chilean Escondida and Spence copper mines had asked its members to vote on the strike action after contract negotiations between employers and employees stalled. The company's integrated operations center, (Integrated Operations Centre), is operated by 205 workers and manages the open-pit mine, cathode and mineral processing plant north of Santiago, Chile.