The Graystone Company Announces Acquires Additional Mining Concession in Peru and Announces Phase I Testing Symbol Price Change GYST.OB 0.26 +0.04   LIMA, Peru–(BUSINESS WIRE)–  The Graystone Company (OTC Bulletin Board: GYST), announced that its 100% owned subsidiary Grupo Minero Inca (a Peruvian Corporation) has claimed a additional mining concession in Peru. The new concession has been named [...]