Chilean workers have ended a 43-day strike at the world's biggest copper mine. The stoppage by some 2,500 workers at the Escondida mine began on February 9 over demands for a bonus payment, a salary increase and other benefits. Workers ended the strike after negotiations failed with majority owner BHP Billiton Ltd.<br/><br/>They used legal provision that allows them to return their old contract with their existing benefits and work conditions. But they will lose out on a bonus payment.<br/><br/>Chile is the world's top copper producing nation. Escondida is located in the Atacama desert and produces about 1.2 million metric tons of copper each year. The South American country's longest-running mining strike caused a loss of an estimated 700 million dollars.