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Round Top

Round Top Project

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 WAC&G’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

Round Top RT18 Chalcocite Drill Core

Round Top Project

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 WAC&G’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

Round Top RT18 Chalcocite Drill Core
Round Top Drill Hole Location Map
Round Top Drill Hole Location Map

Opportunity & Plans

Round Top has been shown to be a major porphyry Cu-Mo-Ag system with extensive chalcocite secondary enrichment for potential SXEW extraction

Upon conclusion of the 2019 drilling program, data from 40 drill holes and 38,060 feet (or 9,933 meters) of drilling will be compiled into a copper resource study and released as a 43-101 Technical Report in 2019Q4

The deposit is open to the southeast and northwest with additional tonnage potential demonstrated by drill holes RT19-027 and 028 at the West Lobe

Opportunities & Plans

Round Top has been shown to be a major porphyry Cu-Mo-Ag system with extensive chalcocite secondary enrichment for potential SXEW extraction

Upon conclusion of the 2019 drilling program, data from 40 drill holes and 38,060 feet (or 9,933 meters) of drilling will be compiled into a copper resource study and released as a 43-101 Technical Report in 2019Q4

The deposit is open to the southeast and northwest with additional tonnage potential demonstrated by drill holes RT19-027 and 028 at the West Lobe

Round Top Drill Hole Location Map
Round Top Drill Hole Location Map

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 temporarily into late lower temperature alteration assemblages

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 temporarily into late lower temperature alteration assemblages

Thin zones of biotite-magnetite-chalcopyrite mineralization (mainstage porphyry mineralization) were encountered below 300m depth in RT-19

Magnetic susceptibility modeling by Precision Geosurveys of WAC&G aeromagnetic data at Round Top shows a deep magnetic apophysis immediately below drill holes RT-18, 19 and 22