Northstar Magnetic Survey Defines Gold Potential at Rosegrove Property

Northstar Gold Corp. has announced that a recently completed airborne magnetic survey by Abitibi Geophysics over the Company's 100%-owned, 1,200 hectare Rosegrove Property, situated 11 km south of the town of Kirkland Lake, has identified 2 significant structures and 5 anomalies consistent with possible syenitic intrusions. 

UAV Magnetic Survey Results

Abitibi's survey report has identified, "Two shear zones and a few faults that may play a key role in the control of gold mineralization. Two distinctive low magnetic corridors (RZ-LC-01, RZ-LC-02 - Figure 2) striking northwest were identified in the center and northeast of the study grid. The largest corridor (RZ-LC-01) exceeding 250 m in width is interpreted as a shear zone; the known Pacaud Fault appears to follow this corridor." The Pacaud Fault, which is proximal to the former producing Barry-Hollinger gold mine, strikes parallel to the Catharine Fault on the nearby Miller Property and could represent another first-order regional structure. The newly identified shear zone (RZ-LC-02) located 500m southwest of the Pacaud Fault has not seen any recorded exploration to date. Numerous west-northwest and northeast striking cross structures were also interpreted from the survey data. 

The report also states that five, "negative elliptical to ring-shaped magnetic anomalies (RZ-03 to RZ-07 - Figure 2) were detected in different areas of the survey grid." These features display magnetic signatures that are similar to known alkaline intrusions in the survey area such as the gold-bearing Allied and Planet Syenites on Northstar's adjoining Miller Gold Property 

In addition to the newly identified structures and intrusive anomalies, the report included a predictive heat map (Figure 3) created with a CET Grid Analysis highlighting areas of structural complexity. These structurally complex areas may have enhanced hydrothermal permeability and could also be prospective for gold mineralization. Centre for Exploration Targeting (CET) is an automatic predictive image processing technique for the prospectivity analysis of Archaean lode-gold deposits. 

A comprehensive surface mapping, sampling and prospecting program will be conducted on the Rosegrove property as a follow up to the magnetic survey. 

The Rosegrove UAV Magnetic Survey

The 12 square km, 240-line km airborne UAV magnetic survey represents the first stage of an integrated exploration program on the underexplored Rosegrove Property (Figure 1), situated between the Company's flagship Miller Gold Property and the Kirkland Lake Gold camp. Val d'or based Abitibi Geophysics mobilized to the Miller Property on June 8th and commenced geophysical surveying utilizing an AeroVision MAG-drone survey system equipped with a Scintrex Cs-VL Cesium Vapor magnetometer. The AeroVision drone system was equipped to acquire high-resolution magnetics while the on-board collision avoidance system was integrated with the data acquisition and navigation systems to fly at a low-level constant terrain clearance between 30m and 35m. Abitibi Geophysics completed the survey work on June 11th, 2020. 

About the Rosegrove Property 

The 1,200 hectare Rosegrove claims overlay the same northwest-orientated mafic and intermediate volcanic rock package that hosts significant gold-telluride mineralization at the Miller Gold Property, including a belt of tuffaceous and volcanic fragmental rocks and evidence of syenite and porphyry intrusives. The Property has several shear zones, faults and splays which may be related to the highly prospective first order Catharine Fault structure and the Pacaud fault adjacent to the former past producing Barry-Hollinger gold mine. 

Previous Exploration

The Rosegrove claims are overlain by clay, sand and glacial deposits that has hampered previous exploration efforts in the area. Previous work on an adjacent property in 1981 by Marshall Boston Iron Mines Limited reported drill intersections as high as 0.60 oz/ton over 2.62 feet. This mineralized zone is apparently open to the south and may extend onto the Rosegrove Property. The southernmost 1981 drill hole appears to be located on the Rosegrove lands.

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