Australia-listed Sunstone Metals on Tuesday announced the latest results from its Bramaderos project, in Ecuador, which provided more evidence that drilling was closing in on the centre of a large copper/gold porphyry system at the Limon target.
Assay results from drill hole LMDD004 at Limon have delivered a long interval of highly anomalous copper and gold values over 360 m from 703 m down hole, to the end of hole.
LMDD004 intersected a sequence of magmatic and hydrothermal breccias and altered intrusive rocks. Vein intensity was mostly low averaging two quartz veins a meter over the 340 m interval from 700 m to 1 040 m depth, but locally averaging 25 quartz veins a metre within a narrow potassic-altered quartz diorite dyke.
The lower part of the hole contained intervals of intense pyrite alteration with minor chalcopyrite within a broader phyllic alteration zone.
Sunstone stated that the results strengthened its belief that LMDD004 and previously reported drill hole LMDD002, had drilled in close proximity to, and within the outer halo of, a mineralised porphyry gold/copper system of significant scale.
“Geological and assay results from Limon hole LMDD004 are telling us we are tantalisingly close to a mineralised porphyry system. We are seeing highly anomalous gold and copper grades over long intervals that suggest we are very close to the main mineralising system,” said MD Malcolm Norris.