Black Rock Mining Limited announced the appointment of John de Vries as Chief Operating Officer on March 16, 2017. His primary responsibility is to complete the Mahenge Graphite Mine PFS and the commence working with the Company´s preferred construction partner to deliver a construction ready mine. Most recently from 2011 to 2015 he acted as General Manager Technical Services for St Barbara. After his success with St Barbara, de Vries took an eighteen month sabbatical before joining Black Rock Mining.