Summary

Mine Type	Underground
Study Completed	Preliminary Economic Assessment
Commodities	Copper Zinc Silver Gold
Mining Method	Longitudinal stoping Transverse stoping Longhole stoping Cut & Fill Overhand Cut & Fill
Backfill type	...
Mine Life	...
Snapshot	The results of a Preliminary Economic Assessment for the Scott Lake project were announced on November 20, 2017. Under the Environmental Quality Act (Quebec), an Environmental and Social Impact Assessment (“ESIA”) will be required and a Certificate of Authorization (“CA”) will need to be obtained for the mining operations at the project. In addition to the CA, Yorbeau will have to obtain permits, authorizations, approvals, certificates, and leases required from the appropriate authorities. To date, no permits have been obtained. No work on the Scott Lake project is planned for 2024.

Deposit type

• VMS

Summary:

The Property is located on the north limb of the Chibougamau Anticline. From south to north, the Property stratigraphy consists of a monoclinal sequence extending from the upper units of the Lake Doré Complex and the Chibougamau Pluton to basalts of the Gilman Formation, with remnants of felsic rocks of the Waconichi Formation caught in between. All units are metamorphosed to the greenschist facies.

The Project consists of a number of mineralized zones that have all the characteristics of volcanogenic massive sulphide (VMS) mineralization. VMS-style mineralization at Scott Lake comprises distinct stratabound massive sulphide lenses located mainly along or close to rhyolite-andesite/basalt contacts. In addition to the massive sulphides, separate zones of VMS style disseminated and stringer sulphides, which may or may not be connected with massive sulphide lenses, have been found over a strike length of at least two kilometres.

The following mineralized zones and lenses have been outlined by drilling at Scott Lake to date:
- Selco Scott deposit;
- West Massive Sulphide Lens;
- 34 Zinc Massive Sulphide Lens, which is stacked above the West Lens;
- Scott Lake Sulphide Stringer Zone, which lies below the West Lens;
- 800 Massive Sulphide Lens;
- Massive Sulphide Central Zone including three lenses, which have been interpreted as stacked above the Sulphide Stringer Zone;
- CFO Lens, which is located west of and at depth from the West Lens;
- CFO Stringer Zone, located beside and underneath the CFO Lens;
- Gap Zone that was recently discovered between the West Lens and the CFO Lens and at the western extent of the Sulphide Stringer Zone. Its eastern extent incorporates the former SC-30 lens.

SELCO-SCOTT DEPOSIT
The Selco-Scott deposit occurs along the contact between altered rhyolites and mafic rocks to the south and a large quartz porphyry dome to the north. No unequivocal stratigraphic facing criteria have been recognized in the immediate vicinity of the deposit, but it is interpreted that the tops are to the north or northwest based on a pillowed andesite outcrop located on strike with and approximately 250 m to the west of the lens, and on pillowed basalt outcrops several hundred metres to the north of the deposit. The irregular intrusive contact between the Chibougamau Pluton and the volcanic rocks lies just south of the deposit and locally comes within 10 m of the sulphide lens. The Selco-Scott deposit has a general east-west strike, with a length of approximately 300 m at the subcrop diminishing to less than 200 m at depth. It dips to the south at approximately 70° to a depth of approximately 200 m where it steepens to near vertical. The massive sulphides narrow with depth and pinch out at a depth of approximately 450 m. The lens is stratiform and varies up to approximately six metres to seven metres in true thickness. It appears that a significant portion of the original deposit may have been removed by erosion.

Pyrite is the most abundant metallic mineral in the deposit and typically constitutes 50% to 80% of the mineralization (Saunders and Allard, 1990). Sphalerite is the main mineral of economic interest and in places constitutes up to 25% of the deposit.

800 LENS
The 800 Lens is located along the south contact of the Scott Rhyolite approximately 600 m west of the Selco-Scott deposit and is centred on Section 800W. It starts at a vertical depth of 500 m and pinches out or disappears at approximately 800 m. It consists of 100% sulphides except for narrow internal diorite or mafic dykes. It has been intersected by only four holes spaced approximately 100 m apart. The sphalerite in the 800 Lens is pale grey to yellowish in colour, which makes it easy to underestimate zinc grades visually. Unlike at other lenses, the massive sulphides are located along a well-defined stratigraphic contact between basalts to the south and altered rhyolite to the north. Sulphide stringers carrying low-grade copper and zinc values are developed in the rhyolite just to the north of the massive sulphides (i.e., presumably in the stratigraphic hanging wall if tops are to the north). Furthermore, the massive sulphides grade laterally into a well-bedded cherty tuff, which is common for VMS camps.

CENTRAL LENSES
It stretches along a flat rake from sections 1000W to 1500W over a strike length of 400 m and at depths ranging from 200 m to 350 m. Unlike the SelcoScott and 800 lenses, which are located along the south contact of the Scott Rhyolite, the Central Zone massive sulphides occur near the north contact of the rhyolite but mostly vertically above the Scott Rhyolite and are hosted essentially in mafic intrusives and/or flows. Massive sulphides in the Central Zone are typically coarse grained with grain sizes in the order of three to five millimetres.

The current model for the Central Zone is that it formed initially as a thick massive sulphide lens sitting directly on top of the Scott Rhyolite from which it was subsequently disconnected and elevated above the Scott Rhyolite by mafic dykes or sills to form three separate massive sulphide slabs (Central 1, Central 2, and Central 3). The current model is that the sulphide zones are largely flat lying (like parts of the West Lens) and are separated from each other by barren mafic dykes and sills.

WEST LENS
The current model involves an elongated east-west trending pod of massive sulphides at the top of a rhyolite ridge or dome, underlain by vertical zones of stringer and semi-massive sulphides. Stringer sulphides reach thicknesses of over 20 m horizontal.

“34” ZINC LENS
This zinc-rich zone may represent a distinct mineralized horizon stacked above the West Lens but, alternately, may also represent a raft that was initially connected to the West Lens and subsequently cut off from the underlying West Lens massive sulphides and moved above the West Lens by mafic dykes and sills, analogous to the separation of the Central Lenses from the underlying stringer zone.

CFO LENS
Significantly, and unlike the West Lens and other mineralization at Scott Lake, this new lens is associated with the Tony Rhyolite, a rhyolite unit which is different from the Scott Rhyolite that hosts the West Lens and is located approximately 100 m further to the north. Strong chlorite alteration is associated with the CFO Lens, both in the Tony Rhyolite and in surrounding mafic fragmental rocks. Recent structural interpretation suggests that the CFO Lens appears to be a structural “raft” caught within the Gwillim Lake fault corridor, and may have been dragged into the northeast trending fault corridor from an unknown source.

The vertical depths of the intersections range from 900 m to1,013 m from surface. The CFO Lens is deeper than the rest of the mineralization at Scott Lake, but the mineralized intercepts obtained so far in the CFO Lens are almost double the overall average copper grade in the RPA (2011) estimate.

STRINGER ZONE (SCOTT RHYOLITE)
In addition to massive sulphides, widespread zones of stringer-type mineralization have also been identified at Scott Lake and more specifically over a two-kilometre strike length within the Scott Rhyolite. However, these stringer zones have not been given specific names and are grouped under the heading “Stringer Zone” for the purpose of resource estimation. Some of the stringer zones are in close proximity and are probably related to specific massive sulphide lenses, whereas other stringer zones do not have any clearly identified massive sulphides associated with them. Furthermore, particularly in the West Lens and Gap Zone areas, stringer sulphides may grade vertically or laterally into massive sulphides.

The Stringer Zone may contain significant copper, zinc, and silver over widths often exceeding 10 m and thus form mineralized envelopes of potential economic interest.

Mining Methods

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Comminution

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Processing

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Commodity Production

Operational metrics

Personnel

Job Title	Name	Ref. Date
.......................	.......................	Dec 16, 2024
.......................	.......................	Oct 28, 2024

Total Workforce	Year
......	2017