FRONTERA AND KUPARI ANNOUNCE COMMENCEMENT OF STRATEGIC SALE PROCESS FOR THE JOINTLY OWNED PIEDRAS VERDES COPPER MINE COMPLEX IN SONORA, MEXICO

MEXICO CITY, June 23, 2026 /PRNewswire/ -- Frontera Copper Corporation, S.A.P.I. de CV and Kupari Investments Ltd. ('Kupari'), collectively the 'Companies', announced today that Frontera Copper Corporation ('Frontera'), and Kupari Metals A.G., a wholly-owned subsidiary of