Projects/Mosseau
Mosseau
Our flagship gold property in the Urban Barry belt of Quebec’s Abitibi region. We hold an option with Vior Inc. to earn 80%, and our first drilling here returned a high-grade discovery.
- 105.0g/t Gold over 1.15 metres (core length), hole MO-25-25 Feb 11, 2026 news release
- 32km Kiask River Mineralized Corridor across Mosseau and LaBelle Apr 16, 2026 news release
- 4,692m Drilled in 21 holes in 2025 Dec 23, 2025 news release
- 20 Priority targets for the next program, chosen from 50 Apr 16, 2026 news release
Location and access
West of Windfall, on the Kiask River corridor
Mosseau lies in the Urban Barry belt of Quebec’s Abitibi region. With LaBelle and Urban Barry, it sits about 45–70 km west of Gold Fields’ Windfall deposit. The property straddles the Eeyou Istchee-James Bay and Abitibi territories, and two Quebec hunting zones (13 and 16).
Since our 2026 acquisitions, Mosseau connects with LaBelle, and together they cover the whole Kiask River Mineralized Corridor. The central area, where the discovery lies, is wooded and had little access, so we cut new roads and drill pads for the 2025 program. Mosseau is suitable for winter drilling.
Sources: Oct 5, 2026 news release, Apr 16, 2026 news release, Nov 4, 2025 news release and Oct 3, 2025 news release.
Geology
Gold in shear zones, with silver and copper beside it
Higher-grade gold at Mosseau commonly comes with anomalous silver and copper, inside broad, lower-grade gold halos. We use copper as a pathfinder for gold.
The Kiask River Deformation Zone runs through the central part of the property; the Toussaint Deformation Zone lies to the north. In the central area, every hole we drilled along strike intersected a gold-bearing corridor up to 16 metres wide, traced for about 3 kilometres and tested only to about 100 metres depth. It remains open in all directions.
In the north, near Trench #1B, our drilling found a new mineralized horizon about 100 metres east of the known lens, with semi-massive sulphides of pyrite and lesser chalcopyrite. It is associated with a moderate induced polarization anomaly with a 600 m strike length.
New claims to the south-west cover Quévillon Group basalts and andesites with intermediate to felsic tuff horizons and gabbro sills, analogous to the rocks that host the corridor.
Technical information from Feb 11, 2026 news release, Nov 25, 2025 news release, Apr 29, 2026 news release and May 5, 2026 news release, prepared and approved by Louis Martin, P.Geo., Technical Advisor to Harvest Gold and a Qualified Person under NI 43-101.
2025 drilling
A high-grade interval in a broad gold corridor
Our maiden program drilled 21 holes for 4,692 metres in the northern and central areas. The central holes, on the Kiask River corridor, returned the discovery. The final five holes, north of the corridor, returned anomalous copper, including 802 ppm Cu over 0.9 m (SW-25-34).
| Hole | Area | Au g/t | Length m | Notes |
|---|---|---|---|---|
| MO-25-25 | Central | 105.0 | 1.15 | Visible gold; 4.3 g/t Ag, 464 ppm Cu |
| MO-25-25 | Central | 0.32 | 6.9 | Lower-grade halo beside the high-grade interval |
| MO-25-26 | Central | 0.50 | 16.35 | Including 1.85 g/t Au and 700 ppm Cu over 1.50 m |
| MO-25-27 | Central | 0.76 | 5.85 | Including 2.11 g/t Au and 466 ppm Cu over 1.00 m |
| MO-25-28 | Central | 0.22 | 16.0 | And 2.48 g/t Au and 571 ppm Cu over 0.50 m |
| MO-25-30 | Central | 0.23 | 6.0 | |
| MO-25-15 | North | 1.90 | 5.4 | Including 8.67 g/t Au, 203 g/t Ag, 2.26% Cu over 0.6 m in semi-massive sulphides |
| SW-25-14 | North | 1.10 | 6.0 | Including 2.02 g/t Au over 1.5 m |
Intervals are core lengths. For the northern holes, the Nov 25, 2025 news release states that true widths are not known at this time. NQ half-core samples were assayed by AGAT Laboratories, independent of Harvest Gold, by 50-gram fire assay with an atomic absorption finish, with standards, blanks and field duplicates inserted. Sources: Feb 11, 2026 news release, Nov 25, 2025 news release and Apr 29, 2026 news release; approved by Louis Martin, P.Geo., Qualified Person under NI 43-101.
Historical results
Earlier drilling found broad gold halos in the north
After our 2025 results, we re-read the historical drilling with a lower gold cut-off than earlier operators used. Wide gold intervals emerged at Trench #1 and the Morono deposit area, where samples were never analysed for copper or silver.
| Hole or showing | Operator or area | Au g/t | Length m | Source |
|---|---|---|---|---|
| 1217-01-13 | SOQUEM, 2001, Trench #1 | 1.44 | 26.2 | GM59164 |
| 1217-01-14 | SOQUEM, 2001, Trench #1 | 3.37 | 14.1 | GM59164 |
| M-12-87 | Morono deposit area | 3.05 | 7.62 | Historical drilling |
| M-25-87 | Morono deposit area | 2.66 | 8.35 | Historical drilling |
| Central Mosseau | Vior Inc., 2017 | 1.13 | 16.0 | GM71014; including 2.93 g/t Au over 5.0 m |
| Lac Labrie | Drill hole | 47.32 | 0.3 | SIGÉOM |
| Lac Labrie | Drill hole | 22.3 | 0.9 | SIGÉOM |
- The Morono deposit is historical and has no estimate under NI 43-101.
- Lengths are core lengths as published; true widths are not known.
Our plan
Twenty targets around the discovery hole
We hold a three-year work permit and a forestry permit, and remain fully funded. At the Lac Simon First Nation’s request, drilling will start once two agreements under negotiation are finalized and a drill contractor is secured; the property is suitable for winter drilling. Forward-looking
- 20 Priority targets in central Mosseau, from 50 defined along the corridor Apr 16, 2026 news release
- 8 At least eight targets within 500 metres of the discovery hole Apr 16, 2026 news release
- 4,000m Approximate size of the planned diamond drill program, about 20 holesForward-looking Jul 15, 2026 news release
- 6,000m Up to 40 holes contemplated to follow the halos in northern MosseauForward-looking Feb 4, 2026 news release
History
Scattered work for decades. Then a modern program.
Vior consolidated Mosseau under one owner; we flew it, mapped it and drilled it in two years.
Historical work by previous operators, from government records cited in our news releases. Not verified by Harvest Gold.
- HistoricMorono deposit drilled
Earlier operators drilled the Morono deposit; samples were not analysed for copper or silver.
- 2001SOQUEM at Trench #1
Drilling in the Trench #1 area (GM59164).
- 2017Vior in the central area
Limited drilling found gold with a shear zone on the Kiask River Deformation Zone (GM71014).
- 2023Option signed with Vior
Announced in our Dec 18, 2023 news release.
- 2024High-resolution magnetics
Helicopter magnetic survey and structural study; Apr 18, 2024 news release.
- 2025Maiden drill program
21 holes, 4,692 metres in the northern and central areas.
- 2026Discovery and expansion
105.0 g/t Au over 1.15 m reported; 24 claims, then 42 more, added along strike.
Ownership and terms
Earning 80% from Vior
Spending at least $1.3M on Mosseau before December 31, 2027 earns us 80%, with Vior holding 20% in a joint venture. We intend to pass that threshold with the next drill program. Forward-looking
Terms as stated in our Apr 29, 2026 news release, Dec 29, 2025 news release, Mar 12, 2026 news release and May 5, 2026 news release.
- Agreement
- Mineral property option agreement with Vior Inc., December 18, 2023, as amended
- Work to earn 80%
- At least $1.3M on Mosseau before December 31, 2027
- December 2025 payment
- 2,000,000 shares at a deemed $0.06, and $100,000 cash to Vior
- Claims added, 2026
- 24 claims (1,356 hectares) bought from two prospector groups; 42 claims (2,367.2 ha) staked
- Audet-Robert royalty
- 1% NSR to the vendors; Harvest Gold may buy back 0.5% for $750,000
News
News releases about Mosseau
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