Northisle > Projects > North Island Project > Other Exploration Targets

Northwest Expo

Project Overview

Northwest Expo has been explored in multiple programs over many decades, including through drilling which was completed in 2006 through 2008, as well as an IP survey completed during 2012. Northisle completed a drilling program during 2021 in the area of previous higher-grade gold intercepts, and holes NW21-03 and NW21-04, combined with previous drilling, confirmed that an area of gold-enriched copper porphyry mineralization exists in an area more than 500 meters long by 360 meters across. Multiple intercepts in this zone extend more than 80 meters in depth with gold grades much higher than found elsewhere on the property. This area is denoted as Zone 1 in the map below

In addition, Northisle completed an extensive surface geophysical program covering an extensive area of silica-clay-pyrite alteration which has been mapped at surface.  During 2022, the company completed a geophysical survey totaled 11.1 line-kilometres covering an area of 2.6km by 1.0km northeast of the Zone 1 area where Northisle carried out drilling in 2021 and identified a gold-enriched zone which is interpreted to be a portion of a larger porphyry system.


The objective of the geophysical survey was to test the area of the trend of silica-clay-pyrite alteration within which historic holes EC-236 intersected 176.4 metres @ 0.12% Cu, 0.09g/t Au and EC-242 intersected 91.5 metres @ 0.15% Cu, 0.18g/t Au. These intercepts are peripheral to a large chargeability anomaly to the west that has not been drill tested. The geophysical survey defined 13 preliminary drill targets in addition to the Zone 1 area to be drilled. Eight of the targets are within the untested area of high chargeability (>12mV/V) noted above.

Current Work Program

Northisle is planning a drill program with the target of defining an initial resource at Northwest Expo Zone 1 during 2023.  The program is anticipated to consist of eight road-based drill holes which, combined with previous drilling, target the definition of an initial resource of 40 million to 50 million tonnes.  To date, there has not been sufficient drilling to provide any certainty that the company will be successful in defining a mineral resource at Northwest Expo.

Northisle is drilling several holes across four drill pads in the Northwest Expo area in order to test both the IP anomalies and the gold-rich zone.


Downward Dog

Project Overview

During analysis of historic IP geophysics and soil geochemistry it was observed that north and northwest of the Red Dog Deposit (see Figure 6) the south and southeast limit of a previous IP survey indicated >17.5 mV/V chargeability anomalies at 40m and 100m depths. A 2005 soil geochemistry survey in this area of no outcrop was found to exhibit coincident anomalies (95th percentile) of >128ppm Cu, >87ppb Au, >34ppm Mo with a peripheral anomalous zone of >194ppm Zn

This geochemical pattern of coincident Cu, Au, Mo and peripheral Zn anomalies is commonly seen in mineralized porphyry areas. The coincident geochemical anomalies are not thought to be caused by drainage from the Red Dog Deposit as this area is separated from the Red Dog Deposit by a ridge of barren diorite and the streams from Red Dog do not drain in this direction.


An IP/magnetic geophysical survey was carried out along two forest service roads (brown dashed lines above), to test a prospective area identified by a review of historic geophysics and soil geochemistry adjacent to a previous geophysical survey which did not fully cover the area.  Five preliminary targets have been defined for future drill testing, as shown on the map below.

Current Work Program

Further mapping, sampling and clay analyses will be carried out to aid focusing geophysical surveys followed by drilling.


Project Overview

The Macintosh target is located to the southeast of the Hushumu deposit. Recent logging roads exposed a large area of previously unknown high level porphyry alteration. During 2021 and early 2022, the company completed a geophysical survey and drilled a total of 9 holes extending 3,579 meters. These programs indicate that the Macintosh target may be a southeast arm of the Hushamu hydrothermal system, but did not intersect economically significant mineralization.  This has provided increased confidence in the viability of the waste storage facility proposed in the Company’s 2021 PEA. The southwest side of Macintosh is interpreted to be faulted and remains to be explored following detailed review of assays, geochemistry, mapping and geophysics, as this area remains very much under drilled.
Project image


The next steps are to complete additional infill drilling in order to upgrade the resource ahead of a potential future pre-feasibility study.

All scientific information contained on this website has been reviewed and approved by Robin Tolbert, P.Geo., Vice President, Exploration of NorthIsle Copper and Gold Inc. who is a “qualified person” as defined by National Instrument 43 – 101 of the Canadian Securities Administration.

Note that the preliminary economic assessment is preliminary in nature. It includes inferred mineral resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves, and there is no certainty that the preliminary economic assessment will be realized.


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