The Trek property North zone is underlain by Upper Triassic Stuhini Group rocks, which have been intruded by Late Triassic monzonitic intrusions, Eocene granitic dikes, sills and stocks of the Major Hart Plutonic Suite, Paleocene to Eocene granodioritic plutons and Miocene basaltic and rhyolitic dikes.
Mineralization on the property is dominated by copper-gold bearing porphyry and porphyry-related disseminated, vein-controlled and breccia hosted mineralization.
The North zone is hosted mainly in augite-bearing andesitic flows, andesitic lapilli tuff and lesser coarse volcaniclastics of the Stuhini Group. Alteration and mineralization are concentrated within and along the flanks of a north-northwest trending monzonite dike, and more importantly within a swarm of breccia pipes exposed in the cliff face. The largest of the breccia bodies exhibits a characteristic circular outcrop pattern, with strong copper oxide staining within and haloing the breccia pipe in the surrounding altered volcanics. The breccia pipes cut both the monzonite dike and the host volcanics, post-dating all intrusive and volcanic units in the vicinity except the Eocene basaltic dikes. The breccia pipes vary in size from 3 to 15 metres in diameter, and appear to form a swarm of pipes, the largest of which measures 12 by 25 metres.
The breccias are well mineralized with primary chalcopyrite, pyrite and bornite mineralization seen as coarse, clotty matrix fill and outcrops are heavily coated with secondary malachite, chalcocite and azurite staining. The largest of these breccias - which was first drilled in 1970 but never reached the target breccia - is easily identifiable in the cliff face as strongly malachite and iron oxide stained. Large clots of massive pyrite up to 30 centimetres and chalcopyrite (plus/minus bornite) up to 5cm are seen in a silica rich matrix. Clasts are commonly bleached, dusty, white to pale green and clay altered with an uncertain protolith, but inferred to be both predominantly volcanic. Black chalcocite coats much of the high grade pieces in the core of the breccia where chalcopyrite is greater than pyrite and jarosite-limonite iron oxides coating is strongest at the contacts with the host rocks, where pyrite is greater than chalcopyrite. Magnetite was previously reported in the zone also.
The main 50 metre by 18 metre zone averages 0.24 gram per tonne gold, 10.6 grams per tonne silver and 2.45 per cent copper (Assessment Report 09614). Propylitic volcanic rocks and quartz carbonate veins occur periphal to the mineralized zones.
Mineralization at the Northeast Zone is within and flanking a northeast trending monzonite to monzo-diorite dike swarm cutting a host rock largely composed of augite-phyric coherent volcanics. Clotty to disseminated malachite, chalcopyrite and pyrite is seen at the contact of the dikes and the host rock. Through-going vein and fracture controlled chalcopyrite-malachite-chalcopyrite is also seen within and haloing the dike, and is associated with silca-albite-epidote-chlorite alteration with locally weak k-feldspar staining and magnetite veining. Locally, calc-sodic alteration is very intense, and albite alteration forms massive white, dusty veins up to 20 centimetres in width. The area is structurally complex and intensely sheared, but main structural controls on mineralization appear to be northeast-southwest, and east-west. Exposure is limited to a 350 metres long north trending gully, with the best mineralization at the northeast zone measuring 100 metres by 50 metres. At the Upper Northeast Zone, alteration mineralogy is vein-controlled to pervasive pink potassium feldspar, and thick east-west trending magnetite veins with lesser epidote and chlorite veining. Mineralization is seen as clotty to vein controlled chalcopyrite, malachite, and chrysocolla, commonly in east-west, north dipping veins. Quartz veins are locally present as chalcopyrite bearing, centimeter-scale veins with center-line sulphides and are stable in potassic assemblages. Drillholes through the Upper Northeast subzone TRK10-05, -06, and TRK11-28 indicate barren rock at depth and to the east.
Work History.
The BIK syndicate (Silver Standard/McIntyre/Kerr Addison) discovered the Silver Standard Zone on the south side of Sphaler Creek in 1957, but only staked it in 1962 as their Kim and Goat claims. In 1963 and 1964, Kennco carried out silt sampling for copper and Molybdenum across what is now the Trek property and discovered additional mineralization north of Sphaler Creek (e.g. North Zone, Northeast Zone, Lower Northeast Zone) and west of the BIK ground on the south side of Sphaler Creek (e.g. West Zone, Camp Zone and South Showings) (Assessment Report 565). The BIK and Kennco properties were amalgamated in 1964 and five short lines of IP and ground magnetics were surveyed in 1965: three on the West Zone, one on the Northeast Zone and one west of the West Zone near Sphaler Creek (Assessment Report 681).
In 1970, Kennco/BIK drilled four AQ holes on the West Zone, totalling 477.3 metres. Only one hole (DDH #2) intersected significant mineralization, with 6.1 metres grading about 0.25 per cent copper and 9.1 metres grading about 0.3 to 0.5 per cent copper. Holes DDH #2 and #3 were collared to the west of the current Sphal claims, on the current Trek property. Three holes, totalling 67.3 metres, were drilled from a single site on the North Zone, but all were abandoned without reaching their target breccia (Private report for Silver Standard Mines Ltd by Milne, 1970).
In 1980, Teck Explorations explored the Kennco/BIK ground (Sphal and Kim claims) with limited silt sampling and reconnaissance in the vicinity of the North Zone and a soil/magnetics grid over the Camp Zone. This grid yielded 25 soil samples with greater than 100 parts per billion gold (Assessment Report 8424). Rock chip sampling was carried out over mineralized parts of the North Zone and Camp Zone in 1981. The weighted average of the 23 North Zone chip samples was 2.45 per cent copper and 0.23 gram per tonne gold over an area of about 18m x 20m. For the Camp Zone, the 34 chip samples taken in 1980 and 1981 gave a weighted average of 0.37 per cent copper and 0.58 gram per tonne gold across an average length of 8.4 metres (Assessment Report 9614). The majority of the Kennco/BIK claims were subsequently allowed to lapse, including those under the bulk of their gold soil geochemical anomaly. Eight claims, covering two of the seven copper-bearing zones were retained by Kennco/BIK and sold to NovaGold Resources in 2004.
In 1987, Equity Engineering Ltd. staked the Trek property around the eight remnant Sphal and Kim 2-post claims. The following year, Lorica Resources Ltd. carried out comprehensive exploration of the Trek property, including a soil/mag/VLF grid between Trek Creek and the line of Sphal claims, with soil samples taken at 25 metre intervals along cross-lines oriented at 120 degrees and spaced 100 metres apart. Several new zones were discovered, including the Gully (massive pyrrhotite copper-gold vein), Heel (copper-gold-Molybdenum porphyry), Toe (copper-silver-gold-zinc-lead VMS?) and East (quartz-carbonate silver-lead-gold-zinc vein) zones. In particular, a 3.6 metre chip sample from the Gully Zone assayed 5.31 per cent copper and 8.77 grams per tonne gold (Assessment Report 18115).
In 1989, Lorica extended the soil/mag/VLF grid 600 metres to the south to cover the Heel Zone and detailed a portion of the 1988 grid with lines at 25 metre intervals to better define the Gully Zone. The geochemical and geophysical data over the grid confirmed 1988 results, indicating a possible strike length of 800 metres for the Gully Zone and a large gold-copper soil geochemical anomaly extending northwest from the Heel Zone. Four contour soil lines were run on the north side of Sphaler Creek to test for a northern extension to the Gully Zone with limited success (Assessment Report 19479).
In 1990, infill soil/mag/VLF lines (50 metres apart) were used to flesh out copper-gold soil anomalies on the 1989 grid. A new soil/mag/VLF grid was laid out on the east side of Trek Creek over the Toe and East zones, at the same orientation as the 1988-89 grid on its west side. A contour soil line was run west from the Sphal claims, returning a number of samples with highly anomalous gold and copper. Prospecting led to the discovery of the Wall Zone, a pyrrhotite-rich copper-gold shear vein west of the Sphal claims, and the Grey Zone, another porphyry copper-gold prospect near the Heel Zone (Assessment Report 20956).
Warner Ventures optioned the Trek property in 1993 and drilled six holes from three sites at the Gully Zone. All holes intersected the a 2-7 metre wide body of semi-massive pyrrhotite-chalcopyrite (“Zone B”) under the surface showing, and some hit a second 2 metre wide semi-massive body (“Zone A”). Hole TRK93-01 intersected 1.50 grams per tonne gold and 1.49 per cent copper across a true width of 7.2 metres in Zone B and hole TRK93-04 hit a true width of 4.3 metres of 3.10 grams per tonne gold and 1.26 per cent copper in Zone A (Assessment Report 23394).
Romios Gold optioned the Trek property in 2006 and focused on the Wall Zone area west of the Sphal claims (Assessment Report 28624). Their work revealed a copper-gold-silver-molybdenum soil geochemical anomaly which measures 600 x 1100 metres, parallel to and alongside the western boundary of the Sphal claims. The 2006 exploration program by Equity Engineering, under contract for Romios Gold Resources, consisted of mapping, prospecting, and geochemical soil, rock, and silt sampling. A soil sampling grid was established over an anomalous contour soil line from 1990 in the area of the West and Wall Zones. In total, 398 soil samples were taken from this area, with an addition 49 samples taken on contour lines opposite the grid on the north side of Sphaler Creek. The area of the grid was the main focus of mapping and prospecting, though considerable work was also dedicated to the North Zone and visiting old zones in the Grey Zone vicinity. Prospecting in the area of the grid led to the discovery of the Tangle Zone. The Tangle zone is characterized by low-grade disseminated copper-gold mineralization of disseminated pyrite, chalcopyrite and pyrrhotite, with fracture surfaces coated in malachite and azurite. This new zone is coincident with a large copper-gold soil anomaly and may simply represent a northwest extension of the West Zone. Several samples from this area are well mineralized with copper and gold and adequately explain the soil anomaly. Prospecting in the area of the North Zone was completed, with rock sampling returning a 5 meter chip sample from this area assaying 3.52 per cent copper and 0.53 gram per tonne gold (Assessment Report 28624). Sampling of old zones confirmed mineralization at the Toe, Heel, Arch, West, Grey, and Pickle Zones.
In 2007, a DIGHEM V airborne geophysical survey was flown for Romios Gold Resources Inc over the Trek North, Trek South, Royce-Porc, and JW properties, in the Galore Creek area Assessment Report 29707). The survey areas can be located on NTS map sheets 104B/14 and 104G/3,4.
Fieldwork in 2008 began with property-wide mapping, geochemical rock sampling and prospecting program, with a focus on the North Zone and nearby showings on the north side of Sphaler creek. In total, 145 geochemical rock samples were taken on the property, with an emphasis on the breccia-style mineralization at the North Zone. Ground Geophysical surveys and associated line-cutting for the completion of Ground Spectral Induced Polarization/Resistivity (IP) and Magnetics surveys was carried out between the North and Northeast zones, and a magnetics survey was completed over the Trek cirque, due west of the 2008 drilling. A follow-up diamond drilling program was initiated with 6 helicopter-assisted diamond drill holes totaling 1408.56 metres drilled on the North Zone. Drillholes intersected strong copper-porphyry and breccia-hosted mineralization, grading up to 0.64 per cent copper and 0.41 gram per tonne gold over 130.9 metres, including 30.5 metres of 2.11 per cent copper and 1.02 grams per tonne gold (Assessment Report 30748). A select sample from the Upper Northeast zone yielded 8.55 grams per tonne gold and 8.07 per cent copper (Desautels, P. (2011-06-21): NI 43-101 Technical Report for the Trek Property).
A diamond drilling program was completed by Romios in 2009 following encouraging results from the 2008 program. A total of 9 drillholes totaling 2730 metres were completed on the North, Northeast and Upper Northeast Zones. Disseminated, vein-controlled and breccia-hosted copper-gold porphyry mineralization was intersected in all 9 holes, returning grades up to 0.36 per cent copper and 0.25 gram per tonne gold over 49 metres, including a high-grade intersection of 4.5 metres of 2.16 per cent copper and 1.66 grams per tonne gold (Assessment Report 31505).
In 2010, Romios completed a further eight drill holes, totalling 4047.4 metres, were completed. Drilling, performed during 2008 through 2010, is reported to have indicated continuity of mineralization between the North Zone breccia-hosted mineralization and the Northeast/Upper North East zones porphyry-style disseminated and vein hosted mineralization. Holes in the area of the Northeast and Upper Northeast Zones encountered mineralization at depths greater than the holes drilled in 2009, and indicate significant extension to the mineralization at depth and open to the east. Highlights of drilling include 0.37 per cent copper, 0.15 gram per tonne gold and 1.18 grams per tonne silver over 102.0 metres in hole TRK10-03 and 0.25 per cent copper, 0.15 gram per tonne gold and 1.94 grams per tonne silver over 152.0 metres in hole TRK10-07 (Desautels, P. (2011-06-21): NI 43-101 Technical Report for the Trek Property).
The 2011 exploration season led by Romios completed a 15 hole diamond drilling program, ground geophysics, geological mapping, and a geochemical rock sampling program. An Induced Polarization (IP) and surface magnetics survey was conducted over the North Zone, for a total of 1.4 line kilometers of coverage along with a downhole magnetics survey consisting of 215 meters in drillhole TRK10-04. Detailed alteration and lithological mapping was conducted on much of the North and Tangle Zones on a 1:1000 scale with a strong focus on structural mapping. A geochemical rock sampling program was conducted on four gullies featuring continuous outcrop on the North Zone. A total of 193 chip samples were taken from gold-copper-silver mineralized outcrops, with the objective of establishing continuity between surface mineralization and mineralization intersected at depth. A total of 46 grab samples were collected from copper-gold mineralization from selected mineralized zones. A total of 7906.48 metres were drilled on the North, Northeast, Upper Northeast, and Tangle Zones. Two drillholes, totaling 1056.74 metres were completed at the Tangle Zone (just west of the 2014 Kim-Sphal property field program) with the purpose of targeting a magnetic and resistivity high identified during a 2010 Fugro geophysical survey. Thirteen drillholes, totaling 6849.74 metres completed at the North Zone, targeted vein and fracture-controlled mineralization, breccia mineralization, and magnetic and resistivity highs identified in the 2010 Fugro geophysical survey. Drillholes at the North Zone intersected copper/gold-porphyry and breccia-hosted mineralization yielding grades up to 113.64 metres of 0.30 gram per tonne gold, 0.25 per cent copper and 3.01 grams per tonne silver including 2.15 metres of 1.82 grams per tonne gold, 6.85 per cent copper and 33.83 grams per tonne silver (Assessment Report 32866).
In 2014, Galore Creek Mining carried out a rock sampling program on the Sphal-Kim claims. A total of six samples were collected to confirm copper and gold grades in historical samples. The program focused on verifying assays collected within the Tangle/Wall zone identified by Equity Engineering in the 2006 program.
In 2014, Romios Gold collected rock samples from their Trek property, including Tundra (104G 400), East (104G 402), Tomb (104G 404) and Lower North (104G 406) zones. See these MINFILE showing for details.
In 2018, Galore Creek Mining collected 5 chip samples on their Sphal-Kim property, four from the Tangle area and 1 from the Lower North area (104G 406). all samples plot as sub alkaline or alkaline basalts. One sample (458401) from the Tangle area was observed to a have fine grained igneous texture. It was collected to compare to the intrusions of the Galore Creek suite and plotted as syeno-diorite with anomalous concentrations of gold and copper (0.155 grams per tonne gold and 0.197 per cent copper) (Assessment Report 38218).