The Tundra zone on the Trek property is underlain by Upper Triassic Stuhini Group rocks, which have been intruded by Late Triassic monzonitic intrusions, Paleocene to Eocene granodioritic plutons, Eocene granitic dikes, sills and stocks of the Major Hart Plutonic Suite 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 Tundra Zone consists of what was previously known as the Heel, Grey, Arch, and Pickle zones. These zones were grouped together because they appear to be continuously mineralized from one zone to the next. The Tundra zone appears to be geologically bounded to the west by the Tangle zone fault and is crossed by a large structure with a surface trace trending approximately 060 degrees expressed by a about 10 metres wide zone of broken rock within a linear topographic depression. To the south, potassic and calc-potassic alteration predominates, whereas to the north, propylitic alteration is dominant. The true orientation and sense of motion (if any) on this structure is unknown. Mineralization north and west of this lineament (former Arch and Pickle Zones) is spatially limited to shear zones where fracture density is high. These zones are generally not more than 10m wide and NNE-trending. Mineralized host rocks in the area include Jurassic monzonite and Stuhini Group rocks. Lithologies of host Stuhini Group rocks include subvolcanic diorite porphyry, andesitic augite-feldspar crystal tuff, and volcanic conglomerate. The subvolcanic diorite porphyry appears to be preferentially mineralized and the mineralization is spatially related to the southern contact with a Jurassic monzonite. However, mineralization is cut off to the south where a large Eocene granodiorite has intruded the mineralized Stuhini Group rocks. Alteration in this area consists of strong fine-grained biotite concentrated along fracture planes with lesser k-feldspar and magnetite. It is also pyrrhotite and chalcopyrite bearing, and may represent the source of metals in the Tundra zone. A large gossanous area to the southeastern edge was geochemically sampled during the 2011 field season however, no anomalous samples were found.
Mineralization at the Tundra zone consists of 5 to 15 per cent pyrite, chalcopyrite and lesser pyrrhotite as disseminations, fracture coatings, and blebby concentrations of sulphides. Semi-massive sulphide veins up to 20 centimetres wide occur in north-northeast trending shear zones. These shear zones contain minor amounts of quartz in the veins. This style of mineralization gradually transitions into the disseminated style of mineralization, but is not as well copper, gold or silver mineralized as other areas. Internal fractures are often coated with azurite and malachite in all areas. Sample 391454 from the 2006 program (41.8 grams per tonne gold), shows that high grades may be obtained from within the porphyry mineralization in the Tundra zone (Assessment Report 28624).
A grab sample (over 5 metres) taken in 1990 on the Heel zone assayed 1.12 per cent copper, 7.61 grams per tonne gold and 117.2 grams per tonne silver (Assessment Report 20956).
In 2014, Romios Gold Resources Inc. collected rock samples from their Trek property, including Tundra (104G 400), East (104G 402), Tomb (104G 404), Lower North (104G 406) and zones. A brief investigation of the mineralization at the Tundra Zone was undertaken, focusing on the area around the drill pads constructed in 2011 and the area recently uncovered by the glacier. Sample H234844 from a hornfelsed andesite just below the drill pad returned 2.37 per cent copper, 1.09 grams per tonne gold and 48.5 grams per tonne silver. Sample H234807, taken from a zone of strong veining to the south of the drill pads returned 1.27 per cent copper. 0.21 gram per tonne gold and 10.7 grams per tonne silver. Sample H234808 from the small gully to the north of the drill pads returned 0.681 per cent copper, 0.433 gram per tonne gold, and 7.2 grams per tonne silver. The results of the sampling at the Tundra indicate that a potentially mineralized body lies at depth.
Refer to the Trek property North zone (104G 022) for details of a common Trek/Sphal property work history of which this showing is part of.
