In addition, preliminary surface geophysical surveys at Macintosh have identified numerous chargeability and resistivity anomalies. Northisle commenced drill testing these anomalies on
Highlights
Drilling confirms a trend of gold-rich copper porphyry mineralization covering 480 meters strike length by 360 meters dip length with an average width of 86 meters and open in multiple directions
Grades in the gold-rich zone at Northwest Expo in the range of three to five times higher than those at Hushamu and Red Dog
Assays for five drill holes at Northwest Expo remain pending that are targeting the eastern extent of interpreted large porphyry-related alteration system
Northwest Expo is approximately 3km to the northwest of Red Dog and not part of current resources
Northwest Expo Details
Northwest Expo has been the subject of several drill programs dating back to at least 2005. Current exploration is focused on gaining a better understanding of three zones, labelled Zone 1, Zone 2, and Zone 3. Zone 1 contains significant intercepts of gold-rich copper porphyry mineralization and is a compelling target for near-term exploration. Zone 2 exhibits extensive faulting and may represent a down faulted block. Zone 3 contains historic drill intercepts of significant (>0.1 % Cu) copper-gold porphyry mineralization from 91 metres to 176 metres in length. Two holes were drilled in 2021 in this area with assays pending.
The objective of the 2021 program at Northwest Expo was to drill test anomalies indicated by limited induced polarization (IP) geophysical surveys completed in 2012. A review of historical drilling from 2005 and 2007, and updated with additional data from 2008, identified several intercepts of economically significant gold and copper which are detailed below. The previous IP geophysics identified a 550 m wide chargeability anomaly (>15mV/V) extending south from a line running northeast from 5619500 North (north of DDH EC245) to 571400 East (northeast of DDH NW21-02). This anomaly is open to the northeast. The IP/Mag survey planned to commence in Q2 2022 will cover that un-surveyed area.
The observed styles of alteration and mineralization in drill holes at Northwest Expo are consistent with the current hypothesis that this porphyry system is tilted to the southwest so that the core of the porphyry system lies to the northeast.
Zone 1 - Gold-rich Porphyry Target
This zone is underlain by Jurassic Bonanza Formation andesitic volcaniclastics, flows and feldspar porphyry dykes and minor diorite with intense silica-clay-pyrite alteration imposed upon them, as well as hydrothermal breccias and silica immiscibility textured rocks emanating from an aerially extensive hydrothermal system. Mineralization occurs predominantly in characteristic chlorite-magnetite altered rocks (CMG) which is identical to the mineralization observed at Island Copper, Hushamu, Red Dog and
Drill hole NW21-03 is of particular interest as it confirms a zone of high-grade gold-copper porphyry mineralization which extends from EC-254 in the west approximately 480 meters horizontally to NW21-03 in the east, and from EC-254 in the north 120 metres horizontally to EC-228 in the south, for an interpreted total extent of at least 500 meters strike length by between at least 240 - 480 metres dip length. Drill holes which intersect this zone have significant mineralized intercepts (>0.1% Cu) ranging from 70 metres to 116 m in length, and an interpreted average true width of 86 metres.
The surveys identified two main IP chargeability anomalies which extend to over 400 metres depth, with branches approaching near surface, and trend across
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