decided to re-read cefas post & AAO release 28 May, my take on Cu; 3 holes drilled 50m to 150m for IP anomalies below old working it is probable the anomalies were caused by unmineralised conductive sources, such as graphite-bearing sedimentary rocks. In an earlier release 3 may AAO stated 'still oxidised & open at depth' at 50m so Cu just started or stopped?
