The Round Top property is a large copper-molybdenum-silver (Cu-Mo-Ag) porphyry system that includes both high grade copper surface discoveries and drill intercepts to a depth of 800 meters. Cu-Mo-Ag mineralization is associated with Cretaceous (+/- 74 Ma) age intrusive rocks.
The 2016-2019 drilling programs demonstrated the existence of an extensive copper mineralized system at Round Top with chalcocite as a meaningful component of the mineralization. The presence of secondary copper mineralization, primarily in the form of chalcocite (Cu2S), is a critical element of WAM’s future value considerations because this form of secondary-enriched copper can be extracted using the solution extraction electro-winnowing (SXEW) method. Drilling at Round Top has also identified a secondary enrichment chalcocite blanket and deep high grade primary copper sulfide mineralization associated with potassic+magnetite alteration.
Exploration & Geology
Significant Drill Intercepts
Significant copper-silver mineralization has been encountered in numerous drill holes:
- RT-11 reported 61.6 meters that averaged 0.50% CuEq
- RT-18 reported 64.7 meters of 0.65% CuEq (includes 31.6 m of 0.72% Cu and 23.8 g/t Ag or 0.90% CuEq)
- RT-19 reported 166.0 m of 0.51% Cu Eq (includes 28.7 m of 0.92% Cu and 8.5 g/t Ag or 1.08% CuEq)
Alteration encountered in 2017 shows a broad lithocap of early phyllic (QSP or sericitic) alteration as crystalline illite overprinted by late intermediate argillic alteration with sheeted high-level often vuggy veinlets of py-cpy-chalcocite (digenite) -covellite and trace bornite.
The presence of hypogene chalcocite-covellite-bornite in argillic and sericitic-altered lithocaps is very rare above porphyries but does occur in some of the best deposits around the world. Some of the most notable examples include Resolution (Arizona), Oyu Tolgoi (Mongolia), Wifi Golpu (Papua New Guinea), and Butte (Montana). This mineralization assemblage is very supportive of a significant porphyry at depth with copper grades extending temporally into late lower temperature alteration assemblages.