Canada-listed gold mining and exploration company Calibre has announced that it will buy joint venture (JV) partner Iamgold’s 70% interest in the Eastern Borosi gold/silver property, which it sees as the next potential “spoke” in its “hub-and-spoke” operating philosophy. Calibre, which operates in Nicaragua, has surplus processing capacity of about 1.5-million tonnes a year at the Libertad Complex and will be launching technical studies in the fourth quarter to better understand how material from Eastern Borosi could be processed at Libertad.