The Triple-J gold occurrence, located 1.5km southwest of Eagle’s Nest (figure 1), lies within the Triple-J fault (AKA Frank’s Fault) at the contact between the regional tonalite body and the Blackbird ultramafic intrusion. Due to the overturned natured of the Blackbird intrusion, the tonalite body lies in the structural hangingwall to the zone. The Triple-J fault, which strikes east-northeast and dips moderately to the northwest, appears to be a parallel structure to the more regional Webequie shear zone (WSZ) located 1km south of Triple-J.
Mineralization at Triple-J was initially discovered in 2009 while targeting Ni mineralization in the Eagle-Two occurrence which lies at depth in the structural footwall. Gold mineralization at Triple-J typically occurs as narrow zones of low-grade to locally high-grade intersections within sheared quartz veins and as “no-see-em” zones within talc-carbonate altered ultramafic rocks. Disseminated sulfides (pyrite+/-pyrrhotite) are typically associated with the mineralized intersections. Low grade (0.5-1.0g/t Au) mineralization has been intersected along the fault for over 1.2km and to depths of over 500m. A higher-grade zone with a northwesterly plunge is observed towards the western end of the fault (figure 2). Interestingly, this plunge direction matches that of sheared Ni mineralization at Eagle-Two and the elongate aspect of the BB-1 chromite lens in the same vicinity. Highlights of intersections into the Triple-J and Triple-J South gold occurrences are presented in the table below.
Based on the airborne magnetic pattern, the Triple-J fault appears to dextrally offset the Blackbird intrusion ~1.2km to the northeast. This dextral offset agrees with the regional dextral sense of motion for the WSZ. The northwest plunge of the higher grade zone, coupled with the plunge of mineralization at Eagle Two, suggests there was a dip-slip component to fault movement at Triple-J as well, with the hangingwall block likely having moved up and to the east (reverse motion). Additional work is required at Triple-J to evaluate the potential for higher grade mineralization along strike and within higher grades shoots down-dip along the Triple-J fault.
The Triple-J South occurrence, which is located 800m south of Triple-J, consists of several thin high-grade gold intersections within narrow sulfide-bearing quartz-carbonate veins cutting serpentinized ultramafic rocks of the upper Blackbird intrusion. The zone was discovered while drilling the BB2-4 chromite lens. The significance of the Triple-J South zone is not in the currently intersected veins, but as an indication of gold fertility proximal to the WSZ (figure 1). Stratigraphic hangingwall rocks to the Blackbird intrusion consist of a mixed package of mafic, ultramafic, quartz-phyric (tuffs and quartz-porphyries) and metasedimentary rocks which are all sheared to some degree and present attractive chemical and rheological traps for gold-bearing fluids which may have ascended along the WSZ and its secondary structures, as at Triple-J South.
|Hole ID||From||To||Length||Au g/t||Area|
|NOT-11-1G237||564.7||565.0||0.3||184||Triple J South|
|NOT-11-1G236||531.2||531.4||0.2||11.5||Triple J South|
|NOT-09-1G135||183.5||183.7||0.2||10.0||Triple J South|
|NOT-11-1G216||484.1||484.3||0.2||7.7||Triple J South|
|NOT-09-1G115||404.4||404.7||0.3||7.4||Triple J South|
The WSZ along with its 2nd and 3rd order structures, presents a compelling gold exploration target which warrants additional exploration. In 2020, Noront executed widely spaced soil sampling over a portion of the WSZ covering known gold occurrences and an interpreted duplex structure along the WSZ. The objective of the survey was to determine if soil sampling could identify bedrock gold mineralization through the till and muskeg cover of the wetlands, and if so to highlight additional areas of gold anomalism. The results were highly encouraging with gold soil anomalies identified in the vicinity of the Triple-J, Triple-J South and AT4 gold occurrences, as well as along an interpreted splay structure (the North Webequie Splay or NWS) of the WSZ (figure 3). Future work in the WSZ will include additional soil sampling, followed up with ground geophysics and drilling in areas of highest priority.