Remember this from drill hole 5?
..."The granodiorite from 104.65m to 107.65m is strongly altered with heavy chlorite replacement and disseminated pyrite-chalcopyrite-chalcocite, with veins of pyrite at 20ø to the core axis. At 107.65m a dark grey to black, silicified dyke of magnetic "granodiorite" with very heavy disseminated chalcopyrite-pyrite, up to 25% by volume, was intersected. The rock was fine grained, very magnetic and very siliceous, and could not be identified. Several samples of the dyke were sent for petrographic analysis, the petrographic report showed it contained 25% potassium feldspar and gold bearing chalcopyrite. The footwall to this 'granitic' dyke is a silicified dark green fluidised quartz-feldspar rich granodiorite with sericite alteration and much pyrite. Further into the footwall, from 113.00m to 121.00m, there are a series of xenoliths or veins of the black dyke intrusive within sericitically altered granodiorite. The Gold-Copper assays from this intersection were spectacular, with values from 1.39 g/t to 26.90 g/t Gold reported and Copper values from 0.192% to 3.116%. The weighted average for the intersection from 107.00m to 113.00m, 6.00 meters, returned 11.69 g/t gold, 37.87 ppm silver and 1.41% copper....."
Perhaps this dyke that Gordon House is talking about is actually a little upward extension of the porphyry minerlization itself? (Certainly stingers of prophyry minerlization into the breccia pipe are common) The intense alteration of the dyke material suggests as much. Look at the great gold/copper values associated with it...now imagine about 1 billon or more tons of it...get the picture? |
