Hopes Advance North Zone
The Hopes Advance North Zone is located 800 m north-northeast of the Hopes Advance Main Zone. The mineralized zone is underlain by folded and contorted porphyritic gabbro, gabbro, graphitic schist and peridotite in a structurally complex part of the property (Figure 20).
In 1962 Falconbridge and its joint venture partners drilled four holes for 600 m in this area. Extensive trenching in the early 1960s reported a composite grade of 6.34% Cu and 1.09% Ni over 17.3 m, not true thickness, in the massive sulphide section. In 1996 Troymin collared 26 drill holes into this region for a total of 3111 m and in 1997 an additional four holes were drilled for a total of 764 m.
Although structurally complex, the area appears to show a steeply plunging anticlinal structure. The massive sulphides occur in tabular bodies on the western limb of the structure that may be truncated. At Hopes Advance North copper- nickel mineralization is present as massive and disseminated sulphides in a zone about 70 m long that strikes north-northwest (Figure 20). Near the north end of the Hopes Advance North Zone graphitic schist and gabbro associated with peridotite that has been thrust from the east contain massive sulphides. Some of the grades include composite intervals of 6.81% Cu and 1.92% Ni over 3.0 m. and 1.24% Cu and 0.84% Ni over 3.95 m in HR 96-35.
In three drill hole fences along a new zone called the Hopes Advance Middle Zone Troymin intersected disseminated and massive sulphides extending about 200 m south of Hopes Advance North. In these three areas massive, stockwork and disseminated chalcopyrite and pyrrhotite mineralization are associated with graphitic schist and with porphyritic gabbro.
Eight sulphide-rich grab samples from gabbro and amphibolite associated with massive sulphide reported values of 140-400 ppb Pt and 120-910 ppb Pd from the area (Wares and Goutier, 1990). A grab sample containing massive chalcopyrite reported 4.4 g/t Pt and 11.3 g/t Pd. Two rock samples from gabbro
that reported 5-15% sulphides also contain 1.5 and 1.6 g/t Au but their exact coordinates are unknown.
Drill hole HR 96-03 reported 1.3 g/t Pd over 0.88 m at 37.17 m; 3.5 g/t Au over 1.2mat45.8m;1.0g/t Pt, 2.8 g/t Pd, and 2.1 g/t Au over 1.0 m at 71.05 m; and 1.1 g/t Pd over 5.0 m at 78.0-83.0 m. The intervals reported are probably not true thicknesses because complex structural environment in this area. No other section of core from Hopes Advance North was analyzed for PGEs (Figure 20) (Beauchamp, 2001).
In a fence of three drill holes about 245 m south of the Hopes Advance North a zone of massive sulphides was intersected in two drill holes. In drill hole HR 96-32 the interval of massive sulphides started at bedrock where a composite value of 1.87% Cu and 0.74% Ni were reported over an interval of 4.0 metres, true thickness (Figure 22). The first interval of this composite reported 1.18% Cu and 2.0% Ni over 1 m.
Collared to test the down-dip extension of HR 96-32, drill hole HR 97-112 intersected 2.45% Cu and 0.39% Ni over 3.5 m, true thickness, with values of 0.55% Cu and 5.0% Ni over 0.5 m. Drill Hole HR 97-114 drilled further down-dip intersected only disseminated mineralization of 0.21-0.81% Cu and 0.09-0.37 averaging 0.50% Cu and 0.19% Ni over 24.0 m, not true thickness.
The style of mineralization is very similar to that of Pio Lake further south on the property. The massive sulphides with high copper and modest nickel, but high PGE are similar to those of the East Lens where they have been compared to hydrothermal mineralization, and the massive sulphide intervals with high copper and nickel resemble the West Lens, which may be magmatic mineralization. None of the core with high nickel values was assayed for PGEs.