Sinclair Gold continues to push the boundaries of its Mt Henry Gold Project in Western Australia, extending known mineralisation well below previous limits and setting the stage for a significant resource update later this year.
- Step-out drilling extends Selene deposit mineralisation down-dip by 125m to ~600m
- Mt Henry deposit mineralisation increases 150% down-dip to ~250m in central zone
- Four diamond rigs active in 50,000m growth campaign with assays pending
- Current 915,000oz resource mainly within upper 100m; new drilling confirms deeper mineralisation
- Resource update scheduled for December 2026, backed by $30m capital raise
Drilling Campaign Uncovers Deeper Gold at Mt Henry
Sinclair Gold Ltd (ASX:SGC) is steadily rewriting the story of its Mt Henry Gold Project, located near Norseman in Western Australia’s prolific Goldfields. Recent step-out drilling has pushed the known gold mineralisation boundaries beyond the existing 915,000-ounce resource, with significant extensions at both the Selene and Mt Henry deposits.
At Selene, the biggest contributor to the project’s resource base with 651,000 ounces, drilling has extended down-dip mineralisation by approximately 125 metres to around 600 metres depth. This represents a meaningful deepening beyond the prior resource footprint, which was largely confined to the upper 100 metres. The broad, continuous mineralised zones and consistent grades reinforce Sinclair’s interpretation of Selene as a large-scale bulk-tonnage gold system.
Mt Henry Deposit Sees 150% Extension Down-Dip
Meanwhile, the Mt Henry deposit, which accounts for roughly 25% of the resource at 232,000 ounces, has seen its interpreted down-dip mineralisation increase by 150% to about 250 metres in the central zone. Step-out drilling has intersected multiple mineralised banded iron formation (BIF) horizons beyond the current resource, highlighting both open pit and underground growth potential.
The mineralisation at both deposits remains open at depth and along strike, suggesting there is more to uncover. Sinclair’s geological model and targeting strategy appear to be paying dividends, with the company reporting strong assay results such as 33.2 metres at 1.6 grams per tonne gold from 230.7 metres at Selene, and 17 metres at 1.5 grams per tonne from 180 metres at Mt Henry.
Aggressive 50,000m Drilling Program Underway
Supporting this resource growth push, Sinclair has four diamond rigs turning as part of a 50,000-metre drilling campaign. Assays are pending for a further 17 holes, and the company recently bolstered its balance sheet with a $30 million capital raise aimed at funding this aggressive exploration effort.
Chief Executive Jeff Sansom emphasised the momentum: “We have significantly expanded the mineralisation at both the Selene and Mt Henry deposits in just four months of drilling. The mineralisation remains wide open at depth and along strike, and we have numerous new targets to test within the 16-kilometre mineralised corridor. We are on track to deliver a resource update later this year.”
Strategic Location and Resource Potential
The Mt Henry Gold Project sits 20 kilometres south of Norseman and about 220 kilometres south of Kalgoorlie, positioned within a highly prospective 16-kilometre BIF corridor. The project hosts a JORC (2012) Mineral Resource of 24 million tonnes at 1.2 grams per tonne gold for 915,000 ounces, spread across Selene, Mt Henry, and the smaller North Scotia deposits.
Historical drilling has largely defined resources to shallow depths, leaving substantial upside potential at depth and along strike. Sinclair’s ongoing drilling program aims to unlock this, with the December 2026 Mineral Resource update expected to incorporate the latest results and potentially reshape the project’s scale.
What Lies Beneath and Beyond
While the current resource figures provide a solid foundation, the real story is in the open-ended nature of the mineralisation. Both Selene and Mt Henry deposits remain open-ended, and Sinclair has multiple new targets along the 16-kilometre corridor yet to be tested. The continuation of drilling and forthcoming assay results will be key to understanding how far this resource can grow.
Investors will be watching closely as Sinclair advances its exploration, with the company’s recent capital raise providing the financial muscle to sustain an active and well-resourced campaign. The upcoming resource update in December will be a critical milestone, potentially unlocking further value in this emerging gold project.
Bottom Line?
Sinclair Gold’s continued drilling success at Mt Henry hints at a resource poised for meaningful expansion, but the full extent remains to be confirmed with pending assays and the December update.
Questions in the middle?
- How will the pending assay results from the 17 holes influence the scale and grade of the upcoming resource update?
- What is the potential for discovering additional high-grade zones within the 16km mineralised corridor beyond Selene and Mt Henry?
- How might Sinclair’s recent capital raise impact its ability to accelerate drilling and advance towards development decisions?