Airborne Geophysics

In 2019 a Geotech VTEM airborne survey was flown over the northern portion of the property early this year. Geotech outlined seven shallow (<100 metre deep) targets, four of which were given high-priority status.

The survey area was flown by Helicopter in an east to west direction with traverse line spacings of 100 metres. Principle geophysical sensors included a Versatile Time Domane Electromagnetic (VTEM Plus) system and a horizontal magnetic gradiometer with two caesium sensors.  A total of 589 line-kilometres of geophysical data were acquired during the survey.

Geotech identified Seven targets of possible polymetallic vein gold mineralization in the Gowganda West Survey area. Results of the geophysical survey are shown in maps below.

Map of Magnetic Data (Reduced to Pole)

The image above shows magnetic data that has been processed by Geotech — the image represents the first vertical derivative of the RTP data (Reduced to Magnetic Pole).

Because Polymetallic vein gold mineralization is structurally controlled it is important to map basement faults from the magnetic data. These mapped structures can be easily seen in the RTP magnetic data. Faults as well as dykes are highlighted.

Map of Magnetic Vector Inversion

The image above represents a Magnetic Vector Inversion Map (MVI) at a depth slice of 250 metres. This image shows Geotech’s interpreted basement district-scale fault zones as well as known and inferred secondary fault systems.

Using Total Magnetic Intensity data and applying a Magnetic Vector Inversion (MVI) Geotech was able to identify several district-scale fault zones that trend in the same direction as the Tyrrell Fault zone (that hosts the Juby Deposit).

Map of Tau-Scaled Chargeability

This map represents processed VTEM data that shows Tau-Scaled Chargeability (TSC). This data highlights areas with strong chargeable responses with relatively coarse grain sizes—good for identifying disseminated metal sulphides.

Generally, disseminated sulphides can be associated with gold mineralization. VTEM surveys detect shallow (<100 metre) sub-surface conductivity and chargeability. These two separate physical phenomena are typically associated with hydrothermal clays, metallic sulphides and some oxides like magnetite and graphite.

Map showing target areas (Z-1A to Z-1G) with respect to shallow (<100 metre deep) Tau Chargeability Anomalies and interpreted deep structures (which may represent feeder structures for mineralization). 

This composite map also highlights the fact that the Tyrrell shear trend and South Corridor Gold Trend are similar to the trend of the interpreted deep structures. In addition, all but one of these deep structures have associated Tau Chargeability anomalies.

A number of potential gold targets have been selected by iMetal Resource Inc based on favourable VTEM conductivity high and magnetic low associations. These targets are shown in the map below and listed  A1 to A12.

3D view of Apparent Resistivity. Hot Colours represent Low Resistivity and highlight 12 additional geophysical targets for iMetal Resource Inc.

Google Map showing Gowganda West property with Geotech Targets.