Negative attack! Trillion giant reports big news! What will happen to the largest copper mine or strike copper prices? Trillion giant BHP Billiton, comes a heavyweight news! On July 29th, it was reported that the labor union of the Escondida copper mine in Chile urged its nearly 2400 members to reject the contract offer and prepare for a strike. BHP holds 57.5% equity in Escondida copper mine. Affected by the above news, BHP Billiton's stock price fell 1.5% at one point during trading on the 29th, and eventually closed down 0.67%, with its market value shrinking to 139.5 billion US dollars, equivalent to about 1 trillion yuan in Chinese yuan.