A strike at Canadian Goldcorp Inc’s Cerro Negro mine in Argentina has forced a halt to operations, the company said on Tuesday, calling the union’s action at its biggest mine illegal. Mining activities stopped when the strike by the Asociacion Obrera Minera Argentina (AOMA) union began on March 8, and processing is also now halted as surface stockpiles have run out, Vancouver-headquartered Goldcorp said in a statement.