TUCSON, Ariz.—More than 1,700 copper-mine workers in southern Arizona and Texas went on strike Oct. 13, after going almost 10 years without a pay increase. The strike involves several unions at eight Asarco LLC mines and smelters whose contract expired in November. “We’ve been in negotiations for over a year now trying to make some sense about this and try to get a fair agreement,” United Steelworkers spokesperson Manny Armenta told KOLD-TV in Tucson. “This is