Golden Minerals Co. (NYSE-A: AUMN and TSX: AUMN) has entered into a definitive agreement to sell its wholly-owned subsidiary, Silex Argentina S.A. (“Silex”), to Butte Energy Inc. (“Butte”). Butte has agreed to purchase 100% of the issued and outstanding shares of Silex, which owns the company’s El Quevar silver project located in Salta Province, Argentina….