Island Gold District Canada

Home Operations Producing Mines Island Gold District, Canada

Quick Facts

Ownership 100%
Location Ontario, Canada
Status Operating
Operation Underground and Open Pit
Commodity Gold

The Island Gold District is comprised of the adjacent Island Gold and Magino mines, two long-life operations with a large Mineral Reserve and Resource base and significant exploration upside. Island Gold is an underground mine and one of Canada’s highest grade and lowest cost gold mines. Magino is a large open pit mining operation located within 300 metres of the Island Gold deposit. The combination of Island Gold and Magino will create one of the largest and lowest-cost gold mines in Canada.

2026 Guidance – Island Gold District

GOLD PRODUCTION

oz Au (thousands)

290 - 330

Total cash cost1

US$/oz

$875 - 975

Mine-Site All-in Sustaining Costs1,2

US$/oz

$1,340 - 1,440

1 Please refer to Cautionary Notes on non-GAAP Measures and Additional GAAP Measures.
2 For the purposes of calculating mine-site all-in sustaining costs at individual mine sites the Company allocates a portion of share based compensation to the mine sites, but does not include an allocation of corporate and administrative expenses to the mine sites.
3 Please see press release issued on February 4, 2026, for updated three-year guidance

Mineral Reserves and Resources

As of December 31, 20251

Island Gold District

Proven and Probable
Mineral Reserves

000 oz Au

8,282

Measured and Indicated
Mineral Resources

000 oz Au

2,029

Inferred
Mineral Resources

000 oz Au

1,398

1 M&I Mineral Resources exclusive of Mineral Reserves. Please see 2025 year end Mineral Reserves and Resources statement for additional detail.

Island Gold Mine Map Larger

The Island Gold District is located just east of the town of Dubreuilville, 83 kilometres northeast of Wawa in Northern Ontario. The Island Gold and Magino deposits are within 300 metres of each other.

Austin Hemphill, General Manager, Island Gold mine Austin Hemphill

General Manager

Dubreuilville, Ontario Canada

The Island Gold District consists of the high-grade, low-cost underground Island Gold mine and the open pit Magino mine located adjacent to each other. The property is currently comprised of 59,900 hectares.

The Island Gold Mine is a growing operation with ongoing exploration success having more than tripled its Mineral Reserve and Resource base since its acquisition in 2017. This has supported multiple expansions of the operation from approximately 900 tpd, at the time of acquisition, to a mining and milling rate of approximately 1,200 tpd in 2025. In 2022, a Phase 3+ Expansion of the operation was announced which includes sinking a shaft. This is expected to double throughput rates to 2,400 tpd following the completion of the shaft in late 2026, driving gold production higher at substantially lower costs.

Alamos acquired the Magino Mine in July 2024. The Magino operation was constructed as a 10,000 tpd open-pit, milling operation with first gold poured in June 2023 and commercial production achieved in November 2023. The acquisition of Magino provided the additional infrastructure to support a larger expansion of the Island Gold District. This included the Magino mill which is federally permitted to operate at 35,000 tpd, and a larger tailings facility permitted to contain 150 million tonnes, more than sufficient to accommodate the large and growing Mineral Reserve base.

In February 2026, a larger expansion of the Island Gold District to 20,000 tpd was announced, supporting increased processing rates of 3,000 tpd of high-grade underground ore, and 17,000 tpd from the open pit. The expansion is expected to be completed in 2028 driving annual production higher to an average of 534,000 ounces over the first 10 years (2028+) at mine-site all-in sustaining costs of $1,025 per ounce. This represents a 113% increase from 2025 production at 30% lower cost with the expansion expected to create one of the largest, longest life, and most profitable operations in Canada.

Island Gold
In 1985, exploration drilling discovered gold mineralization approximately two kilometres south of the Kremzar Mine. Periodic exploration work continued over the years and in 2004, an exploration program was undertaken to complete a Mineral Resource estimate. Island Gold achieved commercial production in October 2007 and has since produced over 1,000,000 ounces of gold. In November 2017, Alamos Gold acquired Richmont Mines and the Island Gold mine.

Magino
Gold was first discovered on the property in 1917. In 1935, underground development commenced with a 100 foot deep shaft and a 500 tpd mill. In 1938, the property changed owners and a detailed underground exploration program began. Following a period of inactivity, in 1986 underground development started again, with production taking place between 1988 and 1992, when the mine closed due to high costs. Argonaut acquired the property in 2012, and completed a Feasibility Study in 2017. A decision to develop the Magino project was made in November 2020. Construction commenced in 2021 with initial production achieved in 2023.

The property lies within the Michipicoten greenstone belt, which is part of the Wawa sub-province and Superior province of Archean age. The property is stratigraphically positioned in the upper portion of the Wawa Assemblage, composed of intermediate to felsic volcanic rocks capped by pyrite-bearing iron formation outcropping in the Morrison and Pine zones.

A large north-easterly trending, structurally deformed zone, called the Goudreau Lake Deformation Zone (GLDZ), occurs between the two assemblages. The GLDZ is believed to be the main control on gold mineralization for the area. The GLDZ hosts the Island, Magino, Lochalsh, Goudreau, Shore, and north shear gold zones, all located within Alamos’ Island Gold District.

East-northeast striking, steeply dipping, sub-parallel zones of gold mineralization are present within the quartz sericite-pyrite-carbonate alteration of the GLDZ. North trending diabase dikes crosscut all stratigraphy.

The Island Gold and Magino deposits are both considered Archean orogenic lode gold deposits. Both deposits occur within the GLDZ zone, and are part of the same system; however, are hosted within different lithologies. Island Gold is a high-grade structurally hosted quartz-carbonate vein system hosted within felsic to intermediate volcanics. Gold mineralization at Magino occurs primarily within the tonalitic Webb Lake Stock with the first gold mineralizing event coincident with the emplacement of the stock, and the second later event associated with gold overprinting and remobilization during deformation within the GLDZ.

The Island Gold mine is an underground operation currently accessed via a ramp system. The primary mining method is longitudinal retreat long-hole stoping.

The Phase 3+ Expansion of the operation to 2,400 tpd is expected to be completed in late 2026. Long-hole open stoping will continue to be utilized as the primary mining method with increased underground development and infrastructure changes including the installation of a shaft and paste plant. The shaft will be sunk to an initial depth of 1,379 metres. The hoisting plant is designed for an ultimate depth of 2,000 metres providing flexibility to accommodate future exploration success. Following the completion of the shaft construction in late 2026, the operation will transition from trucking ore and waste to skipping ore and waste to surface through the new shaft infrastructure, driving production higher and costs significantly lower.

Magino is an open pit mine, with ore extracted by conventional open-pit methods. Mine operations commenced in the first quarter of 2021, and commercial production was declared on November 2, 2023. The processing plant was designed at a throughput of 10,000 tonnes of ore per day utilizing primary crushing, single stage semi-autogenous grinding, a gravity recovery circuit, cyanide leach and a carbon-in-pulp adsorption circuit.Underground ore from Island Gold is currently being processed within the 1,200 tpd Kremzar mill, with remaining ore processed through the Magino mill.

The IGD Expansion was announced in February 2026 and includes and expansion of the Magino mill to 20,000 tpd. The mill expansion will include the construction of a parallel circuit with a capacity of 10,000 tpd, doubling the overall capacity of the mill. The new circuit is designed to process a blend of high-grade underground ore and open pit ore, with the existing circuit to be fed with open pit ore only. Underground mining rates are expected to increase a further 25% to 3,000 tpd and open pit processing rates will increase 70% to 17,000 tpd. The expansion is expected to be completed in the first quarter of 2028 at which point the Island Gold mill will be shut down and all underground and open pit ore will be processed through the larger, centralized, and more cost-effective Magino mill.

The Island Gold District has a 19-year Mineral Reserve life with significant near-mine and regional exploration upside. This includes multiple past producing mines and high-grade showings across the 59,900 hectare land package which represent opportunities for additional higher-grade mill feed within the expanded mill.

Island Gold District


Island Gold Mine

Island Gold Mine – Toxics Reduction Act Public Summary Reports

Magino Mine

Island Gold Phase 3+ Expansion