Windfall

The Windfall property is located in the Abitibi Subprovince of the Canadian Shield, about 35 km west of the Grenville Thrust. The property is located in the central part of the Urban-Barry Greenstone Belt of the Superior Province which contains mixed mafic- to felsic volcanic rocks with lesser sedimentary deposits that are cross-cut by several east- and east-northeast trending deformation zones.  The property is located along the Mazères deformation zone which is a regional-scale east-northeast trending ductile deformation zone that is interpreted to be a second-order structure to the east-west trending Urban deformation zone.

Rocks of the Urban-Barry greenstone belt are generally metamorphosed to greenschist facies and locally reached amphibolite facies. The regional metamorphic gradient generally increases eastward towards the Grenville Front (Joly, 1990).

The Windfall deposit is hosted within the Windfall Member of the Macho Formation (Figure 3), which primarily consists of felsic and intermediate volcanic rocks, including tuff and lava units of tholeiitic affinity. In the Windfall deposit area, the stratigraphy trends northeast and dips moderately towards the southeast. Volcanic rocks are intruded by a series of younger quartz-feldspar porphyry dikes, commonly referred to as quartz-feldspar porphyry (“QFP”) dikes.

Following both historical work by exploration companies and geological mapping programs of the Quebec Government (RG2001-14), the mineralization styles present in the area of the property are:

1)      Volcanogenic Massive Sulphides (VMS) ;

2)      Auriferous volcanogenic veins ;

3)      Orogenic gold associated to shear zones ;

4)      Au-Cu-Zn mineralization associated with tourmalinized metapelites ;

5)      Molybdenum associated with felsic intrusions and pegmatites.

Historical work in this area succeeded in discovering three (3) gold deposits. The  Barry and Gladiator deposits are currently explored by Bonterra Resources. Measured and Indicated Resources of 1,413,000t @ 8.61 g/t Au have been calculated at Gladiator (NI 43-101 Technical Report, June 2021), while Measured and Indicated Resources calculated at Barry are 1,916,000t @ 2.68 g/t Au (same report).

The Windfall deposit is classified as a pre-Temiskaming intrusion-associated gold deposit. Two dominant styles of gold mineralization are observed in the Windfall deposit, and these are a vein-type and replacement-type mineralization. In addition to this, numerous remobilized gold veins cross-cut these features. The bulk of the gold mineralization is contained in extensive anastomosed networks of quartz-pyrite veins and pyrite-rich alteration zones. The resources are defined from surface to a depth of 1,600 m (Andrieux et al., 2023 – NI 43-101 Technical Report Feasibility Study for the Windfall Project).

Most of the Lynx mineralization is contained in an extensive anastomosed network of quartz-pyrite veins hosted within silica-sericite-pyrite altered felsic volcanic rock, gabbros, and felsic QFP intrusions. Most mineralized envelopes in the Main area are associated with pyrite veinlets and stockworks hosted in silica-sericite-pyrite alteration zones occurring near contacts between volcanic rocks and felsic QFP intrusions.

The occurrence of high-grade gold intersections with spectacular visible gold is a well-documented phenomenon at the Windfall deposit. Proven and Probable Reserves at Windfall are estimated at 12.2 Mt @ 8.06 g/t Au for 3.16 million ounces of gold and grading 4.18 g/t Ag for 1.64 million ounces of silver (Andrieux et al., 2023). The drill hole database considered for the resource estimate contains 4,834 surface and underground diamond drill holes totalling 1,852,861 m of drilling, of which 4,152 drill holes (1,665,282 m) were completed and assayed by Osisko.