Historic work on the PIL property includes two drill holes in the northwest part of the property by Cordilleran Engineering in 1967. In 1981, Serem Ltd. blasted two trenches over chalcedony-quartz veining at Atlas West, yielding 2.67 oz/t Ag over 7 m and 0.24 oz/t Au over 5 m. More advanced-stage exploration was not conducted again until 2003, after Finlay had completed several geochemical and geophysical exploration programs to develop targets.
2003 Drilling at PIL South
In 2003, Finlay Minerals drilled 707 m in four holes in the PIL South area. Drillholes PILS-03-01 and -03-04 intersected crystal tuff with intense actinolite, quartz, magnetite, epidote, and K-feldspar alteration, minor sphalerite, chalcopyrite, and malachite mineralization, and anomalous Cu, Zn, and sporadic Ag and Au. PILS-03-01 (400 m), hosted quartz-pyrite-hematite-magnetite-K-feldspar ± chalcopyrite veining in Takla Group metasediments. All holes were shut down prematurely due to bad drilling conditions.
2004 – 2006 Drilling at WG Gold, Northwest & Silver Ridge Zones
In 2004, Finlay conducted a reconnaissance diamond drilling program of 6,168 m in 26 holes at the Northwest, Silver Ridge, Central, Northeast, Gold, and WG Gold targets.
At Gold, drillholes PN-04-17 (253.9 m) and PN-04-18 (230.45 m), intersected monzonite, diorite, and syenite with minor pyrite disseminated and in quartz veins, trace sphalerite and molybdenum, but no significant intercepts. Encouraging results at Silver Ridge and the Northwest Zone led to continued drilling in 2005, as well as in the newly discovered Atlas East Zone.
In the NW Zone, several drill holes (2004 – 2006) intersected wide intervals of weak Cu-Mo ± Au porphyry-style mineralization comprising disseminated pyrite, chalcopyrite and minor molybdenite in strongly altered monzonitic rocks. Within these intervals, structurally controlled quartz-vein stockworks host pyrite ± chalcopyrite ± galena ± sphalerite and fault-controlled quartz-pyrite ± magnetite veining hosts sporadic Au ± Ag enrichment and anomalous Pb-Zn. Sparse galena and sphalerite occur both disseminated and vein-related, commonly with barite-calcite gangue. Gypsum/anhydrite veinlets are locally common.
Drill hole PN04-09 intersected weak Cu mineralization over its entire 396m length, including 24.4m grading 0.21% Cu, 0.02 g/t Au, 0.71 g/t Ag, and 0.003% Mo from 23.15m and 40.0m grading 0.13% Cu, 0.04g/t Au, 1.2g/t Ag, 0.006% Mo.
Follow-up drilling in 2005 succeeded in intersecting porphyry-style Cu-Mo mineralization in two holes >300 m from PN04-09. Hole PN05-02 intersected 59.9 m of 0.11% Cu and 0.003% Mo from 142.65m; PN05-09 intersected 155 m of 0.06% Cu and 0.002 % Mo from 48.5m, including 0.15% Cu, 0.013% Mo along with 88 ppm W, and 0.46% Zn in the bottom 1.70 m of the hole.
In 2006 two holes (PN06-01, 02) were drilled the first of which tested the area west and beneath Hole PN05-02. The second hole targeted the western and possibly down-dropped portion of the NW Zone along a prominent north-south fault zone. Hole PN06-01 intersected 34 metres of very altered and pyritic intrusive rocks containing anomalous Cu. PN06-02 ended in a prominent tectonic breccia likely representing a major fault. Deepening of these holes is planned.
Also during 2005, in an area referred to as the Silver Ridge North Zone, drill hole PN05-03 tested a strong Au-Ag soil anomaly. The hole intersected a shear zone with 2.0 m grading 2.93 g/t Au and 57.5 g/t Ag. At increasing depth, the hole intersected zones up to 68 m wide consisting of strongly altered and pyritic intrusive rocks grading at depth into silicified and brecciated monzonite. A 60.3 m section near the bottom of the hole contains sporadic anomalous Cu, 24 ppm W, and 0.13% Zn. It was apparent that PN05-03 intersected Silver Ridge-type mineralized structures but unexpectedly bottomed in what appears to be a mineralized porphyry system. Drill hole PN05-08, a 100-m southerly step out from PN05-03, bottomed in similar, but less extensive, W-Zn mineralization. The halo of very altered rocks encountered in both holes and the underlying W-Zn mineralized intrusive rocks may be evidence of a deeper or lateral expression of a porphyry system. Drilling is proposed to determine whether Silver Ridge North and the NW Zones are part of a much larger porphyry system.
In the Silver Ridge Zone, drill hole PN04-06 ended in 2.4 m of 1,230 g/t Ag with anomalous Cu, W, and Zn. Similar mineralization, albeit lower grade, was intersected in two holes 0.8 and 1.95 km along-strike to the north-northwest. A parallel hole ~50 m to the SSE in 2005, PN05-10 yielded 2.30 m of 6.8 g/t Ag associated with a shear zone and 7.60 m of 1.05 g/t Au.
In 2005, Fill-in soil sampling was conducted on the existing grid from the Silver Ridge Zone to the NW Zone. Magnetic and electromagnetic (VLF-EM) surveys were conducted over the Silver Ridge, Silver Ridge North and NW Zones. Stream sampling follow-up of historic anomalies was completed. Detailed soil and rock sampling completed on the Atlas East Zone identified numerous float and bedrock occurrences of epithermal gold and silver mineralization. Twelve diamond drill holes totaling 3,090 m were completed on the NW, Silver Ridge, and Atlas East Zones.
2005 – 2007 Drilling at Atlas East
From 2005 – 2007, a total of 3,881 m were drilled in 19 holes at the Atlas East Zone. Drilling intersected silicified volcanics and localized quartz stockwork veining with visible electrum and/or argentite in four drill holes. Six holes intersected reported intervals. Significant drill intercepts include 2.00m assaying 4.65g/t Au and 59.4g/t Ag within a broader interval 26.10m assaying 1.04g/Au and 15.3g/t Ag (Hole A06-05), 1.05m assaying 8.58g/t Au and 361.2g/t Ag within a broader interval of 25.30m assaying 0.96g/t Au and 30.4g/t Ag (Hole A06-12), and 4.00m assaying 5.06g/t Au and 99.1g/t Ag within a broader interval of 20.7m assaying 1.73g/t Au and 31.9g/t Ag (HoleA07-03).
2018 – 2019 Channel Sampling at Pillar East
At Pillar East, epithermal Au-Ag mineralization is hosted in a structural system of variably oriented quartz-amethyst vein and quartz-carbonate breccia zones. Trenching has demonstrated that the mineralized system trends to the NNE for over 500 m, and spans across an ~100 m width.
In 2018, channel sampling from 14 trenches identified 9 new Au-Ag mineralized structures. Priority trenches were excavated at a quartz breccia sub-crop where a 2017 grab sample yielded 19.95 g/t Au and 423 g/t Ag (T2), and ~40 m to the north where a quartz breccia boulder sampled in 2006 assayed 6.57 g/t Au and 13.1 g/t Ag (T1). Trenches T1 and T2 exposed steeply dipping, NW-striking mineralized zones comprised of silicification, quartz veining and quartz-carbonate breccias. Elsewhere, several trenches exposed mineralized and structural (fault) zones that strike northerly and dip near vertically suggesting there are two or more structural orientations associated with the epithermal trend. Free gold, electrum and argentite were visually identified in four samples from T2. Overall, 23 trench samples returned > 1 g/t Au and range up 20.63g/t Au; 15 trench samples assayed > 50 g/t Ag and range up to 694 g/t Ag. Galena (Pb), sphalerite (Zn) and chalcopyrite (Cu) present in many of the structures and metallic analysis of high-grade samples confirmed the presence of coarse gold and silver.
Trenching in 2019 yielded up to 2.79 g/t Au, 12.7 g/t Ag, and 2.4 % combined Pb-Zn over 4.0 m. Mineralization appears to be associated with feldspar-phyric dykes and micro-diorite of the Black Lake Intrusive Suite. Locally elevated Mo suggests a possible porphyry affinity for observed low-sulphidation epithermal-style Au-Ag.
DDH Assay Results