The Sanderson property consists of 70 claims located 40km northeast of Eagle’s Nest. Noront acquired a 75% interest in the property from MacDonald Mines in 2016. It hosts one of the largest layered ferrogabbro sills in the ROF known as the ‘Big Mac’ intrusion (Figure 1). Past exploration focused on potential VMS mineralization in the hangingwall to Big Mac and magmatic Ni-Cu-PGE and chromite mineralization within the intrusion itself. To date no significant deposits have been identified on the property, however there is a significant magnetic anomaly (the Pinay target) in the footwall to the Big Mac intrusion which has never been tested and which Noront believes represents a large ultramafic intrusion similar in scale to the Black Thor Intrusive Complex (BTIC). Should our assumption prove correct, the Pinay target would represent the largest untested ultramafic intrusion in the ROF a high priority target for Ni-Cu-PGE exploration.
Property Geology and Target Model
Regionally, ferrogabbro sills in the ROF have a close spatial, and possibly genetic, association with underlying ultramafic intrusions. This is best observed in the southern ROF where the Thunderbird layered intrusion lies stratigraphically above the ultramafic sill complex hosting the Ni-Cu-PGE and chromite resources in the ROF. It is also observed in the northern limb of the ROF where dunite plugs have been drilled stratigraphically beneath laterally extensive folded ferrogabbro sills. Similarly, on the Butler property ferrogabbro sills overlie peridotite sills with known Ni-Cu-PGE mineralization.
The Pinay target (named after the Ojicree word for ‘partridge’, from the shape of the anomaly) is similarly situated in the footwall to the Big Mac intrusion, one of the largest ferrogabbro bodies in the ROF. A recently acquired high-resolution airborne magnetic survey over the target shows it to be up to 800m thick by 4.5km long (figure 2) with a tabular main body and two to three sinuous limbs which could represent feeder dykes to the main body. Internal magnetic layering at Pinay is similar to the BTIC and several discrete anomalies along the peripheral may represent related satellite intrusions. Initial work on the Pinay target will attempt to confirm the ultramafic origin of the magnetic anomaly, which will be followed up with more detailed targeting.
In addition to the Pinay target, Noront is examining the footwall environment along the northern margin of the Big Mac intrusion where our recently acquired high-resolution magnetic survey has identified numerous discrete and somewhat sinuous magnetic anomalies in proximity to more primitive portions of the Big Mac intrusion.
The Sanderson property consists of 70 claims and hosts one of the largest layered ferrogabbro sills in the Ring of Fire, known as the “Big Mac” intrusion.
Noront is currently reviewing the technical documentation for this recently acquired site.