Alamos Gold Inc. (TSX:AGI; NYSE:AGI) today reported new results from underground and surface drilling at the Island Gold Mine. Exploration drilling continues to extend high-grade gold mineralization across the Island Gold Deposit, as well as within several hanging wall and footwall structures.    Additionally, the regional exploration program has been successful in intersecting high-grade gold mineralization at the past-producing Cline-Pick and Edwards mines, located seven kilometres from the Magino Mill.

“Island Gold’s Mineral Reserve base has increased for 12 consecutive years. Our ongoing exploration success across the extent of the deposit, as well as within the hanging wall and footwall continues to support our expectation this tremendous pace of growth will continue. This growth highlights the significant near-term upside opportunities we expect to incorporate into the Island Gold District Expansion Study which we expect to release later this year. Additionally, the high-grades being intersected within the nearby Cline-Pick and Edwards past producing mines, highlight the longer-term opportunities for further growth through multiple sources of higher-grade ore feeding a potential larger expansion of the Magino mill,” said John A. McCluskey, President and Chief Executive Officer.

Island Gold Main zone exploration highlights: high-grade mineralization extended outside of Mineral Reserves and Resources in the E1E and C-Zones. These zones are the main structures which host the majority of currently defined Mineral Reserves and Resources at Island Gold. New highlights include¹:

• Island West (C-Zone)
• 21.58 g/t Au (21.58 g/t cut) over 5.07 m (1025-503-05);
• 14.81 g/t Au (14.81 g/t cut) over 2.02 m (1025-503-08); and
• 13.92 g/t Au (13.92 g/t cut) over 3.15 m (1025-497-22).
• Island East (E1E-Zone)
• 15.87 g/t Au (15.87 g/t cut) over 2.72 m (945-624-83).

Island Gold Hanging Wall and Footwall exploration highlights: high-grade gold mineralization intersected within new and recently defined hanging wall and footwall zones across the main Island Gold Deposit. These zones represent significant opportunities to continue to grow near mine Mineral Reserves and Resources which are low-cost to develop, given their proximity to existing infrastructure. New highlights include¹:

• Island West Hanging Wall and Footwall Zones

   B Zone

• 37.26 g/t Au (14.88 g/t cut) over 2.86 m (850-472-38).

   NS1 Zone

• 11.66 g/t Au (11.66 g/t cut) over 9.37 m (850-472-32); and
• 33.33 g/t Au (28.09 g/t cut) over 2.83 m (850-472-23).

   NS2 Zone: growing parallel structure, 200 m east of NS1 Zone

• 64.85 g/t Au (12.52 g/t cut) over 2.09 m (1025-503-03); and
• 11.89 g/t Au (11.89 g/t cut) over 2.20 m (1025-503-02).
• Island East Footwall Zones

   E1D Zone

• 21.42 g/t Au (21.42 g/t cut) over 4.00 m (945-624-73).

   E1D1 Zone

• 86.36 g/t Au (50.87 g/t cut) over 2.01 m (945-624-79); and
• 18.94 g/t Au (18.94 g/t cut) over 2.10 m (945-624-83). 

   NTH Zone

• 191.26 g/t Au (14.14 g/t cut) over 2.10 m (620-619-10); and
• 28.12 g/t Au (7.72 g/t cut) over 2.78 m (620-619-11).

Other Hanging Wall and Footwall intersections within yet to be defined zones (Unknown Zones): drilling continues to intersect high-grade mineralization beyond currently defined zones and in proximity to existing underground infrastructure. This includes drill hole 1025-503-12 (86.23 g/t Au over 2.15 m), located 45 m south of the main C-Zone in Island West. These are part of more than 1,500 intersections above 3 g/t Au outside of existing Mineral Reserves and Resources in the hanging wall and footwall. Through additional drilling, there is excellent potential to define additional new zones supporting significant growth in near-mine Mineral Reserves and Resources. New highlights include²:

   Footwall

• 43.75 g/t Au over 2.05 m (1065-619-05);
• 84.52 g/t Au over 0.95 m (1130-610-19);
• 18.56 g/t Au over 4.10 m (850-472-16); 
• 23.29 g/t Au over 2.00 m (1025-503-07); and
• 10.89 g/t Au over 4.20 m (890-461-50).

   Hanging Wall

• 86.23 g/t Au over 2.15 m (1025-503-12);
• 10.20 g/t Au over 12.00 m (850-472-26);
• 23.37 g/t Au over 5.10 m (890-461-51);
• 51.60 g/t Au over 2.20 m (1025-503-02);
• 53.04 g/t Au over 2.13 m (850-472-29);
• 17.59 g/t Au over 4.40 m (890-461-14);
• 12.68 g/t Au over 5.50 m (890-461-43); and
• 20.18 g/t Au over 3.05 m (850-470-05).

Island Gold East delineation and definition drilling highlights: Ongoing surface and underground delineation drilling is focused on the conversion of a significant portion of the large Mineral Resource base which is expected to be incorporated into an Expansion Study to be released in the fourth quarter of 2025. Drilling from the 945, 1065, 1130, and 1160-levels has continued to define wider, higher-grade zones over a 150 m by 250 m area within the Island Main structure. New highlights include¹:

• 83.02 g/t Au (28.30 g/t cut) over 5.57 m (1160-625-11);
• 55.63 g/t Au (40.28 g/t cut) over 6.36 m (1160-625-11);
• 60.81 g/t Au (41.21 g/t cut) over 5.09 m (945-623-05);
• 31.44 g/t Au (24.03 g/t cut) over 8.27 m (1130-610-18);
• 43.36 g/t Au (42.58 g/t cut) over 5.97 m (1160-625-02);
• 22.83 g/t Au (13.75 g/t cut) over 10.78 m (945-624-73);
• 31.46 g/t Au (26.08 g/t cut) over 7.33 m (1130-610-01);
• 7.23 g/t Au (7.23 g/t cut) over 31.63 m (1160-625-03); and
• 23.80 g/t Au (16.04 g/t cut) over 6.31 m (1130-610-06).

¹ All reported composite intervals are calculated true width of the mineralized zones. Drillhole composite intervals reported as “cut” may include higher grade samples which have been cut to: Island West (C-zone) and Island Main @ 230 g/t Au; Island Main and East (E1E Zone) @ 185 g/t Au; B Zone @ 120 g/t Au; E1D, NS1 Zone and NTH4 @ 100 g/t Au; E1D1 zone @ 90 g/t Au; NS2, NTH and NTH2 zone @ 35 g/t Au.
² All reported composite intervals are core length, true width is unknown at this time, and gold grades are reported as uncut.

Regional drilling within the past producing Cline-Pick and Edwards Mines has extended high-grade gold mineralization beyond the extent of previous mining. All three deposits are within seven kilometres of the Magino mill and are being targeted as potential sources of additional higher-grade mill feed within a larger expansion. New highlights include³ :

Cline-Pick Mines:

• 8.22 g/t Au over 21.13 m (24IGX087), including:

º 82.54 g/t Au over 1.57 m; and

º 11.25 g/t Au over 1.48 m.

• 19.22 g/t Au over 4.65 m (25IGX102), including:

º 34.19 g/t Au over 2.59 m.

• 18.83 g/t Au over 4.29 m (25IGX108), including:

º 82.30 g/t Au over 0.81 m.

• 41.01 g/t Au over 1.55 m (24IGX095), including:

º 68.90 g/t Au over 0.91 m.

• 8.00 g/t Au over 6.46 m (24IGX085), including:

º 132.50 g/t Au over 0.30 m.

Edwards Mine:

• 55.95 g/t Au over 2.12 m (24IGX089), including:

º 131.00 g/t Au over 0.87 m

³  All reported composite intervals reported as uncut, and composites lengths are reported as core length. True width is estimated to be 40 to 85% of core length. Composites are calculated with a 0.5 g/t cut-off, maximum internal waste of 4 m, and no minimum length. Higher-grade intervals within the primary drillhole composite are reported as “Including” for any individual or consecutive samples with assay grades greater than 10 g/t Au.

New highlight intercepts can be found in Tables 1, 2, and 3, and in Figures 1, 2, 3, and 4 at the end of this news release.

2025 Exploration Drilling Program 

A total of $27 million is budgeted for exploration at the Island Gold District in 2025, up from $20 million spent in 2024. The exploration program will build on the success from 2024, with high-grade gold mineralization extended across the Island Gold deposit, as well as within multiple structures within the hanging wall and footwall. This drove another significant increase in Mineral Reserves and Resources, marking the ninth consecutive year.

Given ongoing exploration success and with the deposit open laterally and at depth, and some of the best intercepts ever drilled at Island Gold located within the lower portion of Island East, there is excellent potential for further growth in Mineral Reserves and Resources. The discovery cost of the high-grade Mineral Resource additions averaged an attractive $13 per ounce in 2024, and $13 per ounce over the past five years.

Following up on this success, a total of 41,500 m of underground drilling is planned in 2025 with a focus on defining new Mineral Reserves and Resources in proximity to existing production horizons and infrastructure. Additionally, 18,000 m of surface exploration drilling has been budgeted targeting the area between the Island Gold and Magino deposits, as well as the down-plunge extension of the Island Gold deposit, below a depth of 1,500 m. Included within sustaining capital, 30,800 m of underground delineation drilling is planned and focused on the conversion of the large Mineral Resource base to Mineral Reserves.

Magino’s exploration program has been incorporated into the broader Island Gold District budget which totals $27 million. The focus in 2025 will be expanding mineralization to the east of the pit which was previously constrained by the border with Island Gold prior to the acquisition. Included within 2025 sustaining capital guidance is 18,000 m of surface delineation drilling planned at Magino. The focus of the delineation drilling is the conversion of the large Mineral Resource base to Mineral Reserves.

The regional exploration program at the Island Gold District includes 10,000 m of surface drilling, consistent with the 2024 program. The focus will be following up on high-grade mineralization intersected at the Cline-Pick and Edwards deposits located approximately seven kilometres northeast of the Island Gold mine. Drilling will also be completed at the Island Gold North Shear target, and to the east and along strike from the Island Gold mine to test the extension of the E1E-zone.

Island West

Underground Exploration Drilling

High-grade gold mineralization further extended outside of existing Mineral Reserves and Resources in the middle portion of Island West. Drilling is being conducted from the 1025-level, between vertical depths of 900 m and 1,300 m.

New highlights in the C-Zone include (Figure 1, Table 1) ¹:

• Island West (C-Zone)
• 21.58 g/t Au (21.58 g/t cut) over 5.07 m (1025-503-05);
• 13.92 g/t Au (13.92 g/t cut) over 3.15 m (1025-497-22); and
• 14.81 g/t Au (14.81 g/t cut) over 2.02 m (1025-503-08).

Island West Hanging Wall Zones

In addition to testing the main Island Gold structure (C-Zone), underground exploration drilling continued to target high-grade gold mineralization in sub-parallel and perpendicular structures in the hanging wall from the 850 and 1025-levels.

NS1 and NS2 Hanging Wall Zones

The NS1 zone is a northwest-striking structure with a high-angle orientation relative to the C-Zone that was discovered in early 2023. The first stopes were mined from the NS1 zone during the second half of 2023 and it continues to be actively mined, highlighting the near-term opportunities within these hanging wall and footwall zones.

The NS2 zone is a sub-parallel, northwest-striking structure discovered in 2024, 200 m east of the NS1 zone. To date, this zone has been defined over a vertical extent of 300 m, and an average strike of 100 m. Recent drilling suggests that the vertical extent could extend to at least 400 m.

In addition, as highlighted in the January 13, 2025 exploration update, several other north-striking high-angle structures have been identified across the deposit from reinterpretation of historical hanging wall drilling. These structures will be further evaluated as underground exploration drilling advances.

New highlights from the Island West Hanging Wall zones include¹ (Figure 2, Table 1):

• Island West Hanging Wall and Footwall Zones

   B Zone

• 37.26 g/t Au (14.88 g/t cut) over 2.86 m (850-472-38).

   NS1 Zone:

• 11.66 g/t Au (11.66 g/t cut) over 9.37 m (850-472-32); and
• 33.33 g/t Au (28.09 g/t cut) over 2.83 m (850-472-23).

   NS2 Zone: expanding a new structure parallel and 200 m east of NS1 Zone

• 64.85 g/t Au (12.52 g/t cut) over 2.09 m (1025-503-03); and
• 11.89 g/t Au (11.89 g/t cut) over 2.20 m (1025-503-02).

Island East

Underground Exploration Drilling

Underground drilling continues to extend high-grade gold mineralization outside of Mineral Reserves and Resources in upper to middle portions of Island East.

New highlights in the E1E-Zone include (Figure 1, Table 1):

• Island East (E1E-Zone)
• 15.87 g/t Au (15.87 g/t cut) over 2.72 m (945-624-83).

Underground Delineation Drilling

Island Gold East delineation and definition drilling highlights: ongoing drilling focused on the conversion of Mineral Resources to Mineral Reserves from the 945, 1065, 1130, and 1160-levels has defined wider, higher-grade zones over a 150 m by 250 m area within the Island Main structure. Ongoing surface and underground delineation drilling is focused on the conversion of a significant portion of the large Mineral Resource base which is expected to be incorporated into an Expansion Study to be released in the fourth quarter of 2025. New highlights include¹:

• 83.02 g/t Au (28.30 g/t cut) over 5.57 m (1160-625-11);
• 55.63 g/t Au (40.28 g/t cut) over 6.36 m (1160-625-11);
• 60.81 g/t Au (41.21 g/t cut) over 5.09 m (945-623-05);
• 31.44 g/t Au (24.03 g/t cut) over 8.27 m (1130-610-18);
• 43.36 g/t Au (42.58 g/t cut) over 5.97 m (1160-625-02);
• 22.83 g/t Au (13.75 g/t cut) over 10.78 m (945-624-73);
• 31.46 g/t Au (26.08 g/t cut) over 7.33 m (1130-610-01);
• 7.23 g/t Au (7.23 g/t cut) over 31.63 m (1160-625-03);
• 23.80 g/t Au (16.04 g/t cut) over 6.31 m (1130-610-06);
• 12.16 g/t Au (12.16 g/t cut) over 12.06 m (1065-619-03);
• 31.11 g/t Au (24.03 g/t cut) over 4.31 m (1130-610-11);
• 14.20 g/t Au (14.20 g/t cut) over 7.04 m (1065-619-06);
• 11.18 g/t Au (11.18 g/t cut) over 8.17 m (1065-619-04);
• 16.59 g/t Au (16.59 g/t cut) over 5.39 m (1160-625-16);
• 19.61 g/t Au (19.61 g/t cut) over 4.22 m (1130-610-02);
• 11.42 g/t Au (11.42 g/t cut) over 6.74 m (1065-619-05);
• 7.34 g/t Au (7.34 g/t cut) over 9.85 m (1130-610-09);
• 11.40 g/t Au (11.40 g/t cut) over 5.28 m (1130-610-10); and
• 12.60 g/t Au (12.60 g/t cut) over 4.25 m (945-623-07).

Island East Footwall Zones

Underground exploration drilling continues to target and expand high-grade gold mineralization in structures in the footwall from the 620 and 945-levels that were defined and included in year-end 2024 Mineral Reserves and Resources. Ongoing drilling in 2025 continues to confirm the continuity and extend high-grade gold mineralization within the E1D, E1D1, and NTH zones, located between 10 m and 60 m from the E1E-Zone.

New highlights from the Island East Footwall zones include¹ (Figure 2, Table 1):

• Island East Footwall Zones

   E1D Zone

• 21.42 g/t Au (21.42 g/t cut) over 4.00 m (945-624-73).

   E1D1 Zone

• 86.36 g/t Au (50.87 g/t cut) over 2.01 m (945-624-79); and
• 18.94 g/t Au (18.94 g/t cut) over 2.10 m (945-624-83).

   NTH Zone

• 191.26 g/t Au (14.14 g/t cut) over 2.10 m (620-619-10); and
• 28.12 g/t Au (7.72 g/t cut) over 2.78 m (620-619-11).

As with the hanging wall and footwall zones in Island West, these footwall zones in Island East highlight the potential to add high-grade Mineral Reserves and Resources in proximity to existing production horizons and infrastructure which would be low-cost to develop and mine.

Other Zones

The majority of Island Gold’s Mineral Reserves and Resources and main production horizons are hosted in the C/E1E structure. The Island Gold Deposit also consists of a growing number of sub-parallel and high-angle mineralized structures outside of the main C/E1E-Zone. As underground development advances, these sub-parallel hanging wall and footwall structures can be targeted and defined with step-out drilling from underground drill platforms.

These zones, and other targets within the hanging wall and footwall, represent significant opportunities to continue defining additional high-grade Mineral Reserves and Resources in proximity to existing underground infrastructure. These zones continue to enhance the ounce per vertical metre profile and provide additional operational flexibility with multiple mining horizons from the same lateral development levels.

The following are highlights of new hanging wall and footwall intersections from underground exploration drilling where the geometry and continuity are not yet established (“Unknown Zone”). These are part of more than 1,500 intersections above 3 g/t Au within recently defined and yet to be defined zones in the hanging wall and footwall. These intersections are outside of existing Mineral Reserves and Resources, highlighting the opportunity for significant near-mine additions as ongoing drilling further defines these areas.

New highlights include² (Table 1):

   Footwall

• 43.75 g/t Au over 2.05 m (1065-619-05);
• 84.52 g/t Au over 0.95 m (1130-610-19);
• 18.56 g/t Au over 4.10 m (850-472-16);
• 23.29 g/t Au over 2.00 m (1025-503-07);
• 10.89 g/t Au over 4.20 m (890-461-50); and
• 13.50 g/t Au over 2.25 m (850-472-16).

   Hanging Wall

• 86.23 g/t Au over 2.15 m (1025-503-12);
• 10.20 g/t Au over 12.00 m (850-472-26);
• 23.37 g/t Au over 5.10 m (890-461-51);
• 51.60 g/t Au over 2.20 m (1025-503-02);
• 53.04 g/t Au over 2.13 m (850-472-29);
• 17.59 g/t Au over 4.40 m (890-461-14);
• 12.68 g/t Au over 5.50 m (890-461-43);
• 20.18 g/t Au over 3.05 m (850-470-05);
• 15.39 g/t Au over 3.50 m (850-472-20);
• 24.26 g/t Au over 2.20 m (945-623-03);
• 14.93 g/t Au over 2.55 m (850-472-29); and
• 13.28 g/t Au over 2.35 m (850-482-01).

¹ All reported composite intervals are calculated true width of the mineralized zones. Drillhole composite intervals reported as “cut” may include higher grade samples which have been cut to: Island West (C-zone) and Island Main @ 230 g/t Au; Island Main and East (E1E Zone) @ 185 g/t Au; B Zone @ 120 g/t Au; E1D, NS1 Zone and NTH4 @ 100 g/t Au; E1D1 zone @ 90 g/t Au; NS2, NTH and NTH2 zone @ 35 g/t Au.
² All reported composite intervals are core length, true width is unknown at this time, and gold grades are reported as uncut.

Regional Exploration: Cline-Pick and Edwards Mines

The Cline-Pick and Edwards mines are located seven kilometres by road northeast of the Magino Mill. Alamos acquired these past-producing mines in 2020 as part of its consolidation of the northeastern segment of the Michipicoten Greenstone Belt with the acquisition of Trillium Mining Corp.

Historic interest in the area dates to 1918 with Cline Lake Gold Mines Ltd & O’Brien Gold Mining Ltd developing underground from the Shaft 3 and 4 areas (Figure 3 and 4). Shaft 4 was the focus of mining operations between 1938-1942 producing 63,328 oz Au (300,981 tonnes @ 6.55 g/t Au). The property remained inactive until Pick Mines Ltd. acquired the property in 1959 and continued lateral development from Shaft 3. No production resulted from the Pick Mines period with the property reverting to the Crown in 1974. The Pick property was closed to staking until the early 1980’s with it changing ownership multiple times until being acquired by Alamos in 2020.

At Edwards, interest dates to 1924 with Peter Edwards staking the original claims that are optioned a year later by Hollinger Gold Mines. The main historic Shaft 1 was sunk and mining operations commenced from 1933-1937 producing 435 oz Au (1,426 tonnes @ 10.6 g/t Au). Property ownership changed multiple times until 1996, when River Gold Mines in partnership with VenCan Gold Corporation developed a portal/decline to the south-west of Shaft 1 and mined two ore shoots to the 280 m level. Production continued until gold prices fell in 2001, forcing the closure of the mine. During this period, the Edwards mine produced 140,000 oz. Au (387,000 tonnes @ 11.2 g/t Au). The Edwards property was bought by Strike Minerals Inc. in 2002 and throughout their ownership they were able to develop exploration drifts to the North at the 60m and 90m levels at Edwards Shaft. There has been no further production on the Edwards Mine since its closure.

Since then, detailed historical data compilation, historic mine working digitization, and geological modelling has been completed which has supported exploration targeting within the larger gold system without the limitations of mineral tenure boundaries.

A total of 14,688 m across 44 holes were completed by Alamos at Cline-Pick and Edwards between 2023 and 2025 as part of the regional drilling program (in addition to 4 abandoned holes). Assays are pending for 9 of the 44 drill holes.

This drilling has expanded high-grade gold mineralization beyond the extent of historic mining. Extension of high-grade gold mineralization at these historic mines represent potential future sources of additional ore within a larger expansion of the Magino mill. New highlights include³:

Cline-Pick Mines:

• 8.22 g/t Au over 21.13 m (24IGX087), including:

º 82.54 g/t Au over 1.57 m; and

º 11.25 g/t Au over 1.48 m.

• 19.22 g/t Au over 4.65 m (25IGX102), including:

º 34.19 g/t Au over 2.59 m.

• 18.83 g/t Au over 4.29 m (25IGX108), including:

º 82.30 g/t Au over 0.81 m; and

º 14.35 g/t Au over 0.95 m.

• 41.01 g/t Au over 1.55 m (24IGX095), including:

º 68.90 g/t Au over 0.91 m.

• 8.00 g/t Au over 6.46 m (24IGX085), including:

º 132.50 g/t Au over 0.30 m.

• 5.65 g/t Au over 5.40 m (24IGX096A), including:

º 51.10 g/t Au over 0.55 m.

• 23.66 g/t Au over 1.38 m (25IGX109), including:

º 54.40 g/t Au over 0.57 m.

• 4.95 g/t Au over 7.34 m (24IGX085), including:

º 11.93 g/t Au over 0.99 m; and

º 33.90 g/t Au over 0.55 m.

• 13.16 g/t Au over 1.77 m (24IGX101), including:

º 62.90 g/t Au over 0.34 m.

Edwards Mine:

• 55.95 g/t Au over 2.12 m (24IGX089), including:

º 131.00 g/t Au over 0.87 m.

• 36.80 g/t Au over 0.40 m (24IGX088);
• 32.00 g/t Au over 0.43 m (24IGX088); 
• 31.20 g/t Au over 0.45 m (24IGX088); and
• 13.60 g/t Au over 0.60 m (24IGX088).

³  All reported composite intervals reported as uncut, and composites lengths are reported as core length. True width is estimated to be 40 to 85% of core length. Composites are calculated with a 0.5 g/t cut-off, maximum internal waste of 4 m, and no minimum length. Higher-grade intervals within the primary drillhole composite are reported as “Including” for any individual or consecutive samples with assay grades greater than 10 g/t Au.

Qualified Persons

Scott R.G. Parsons, P.Geo., FAusIMM, Alamos Gold’s Vice President, Exploration, has reviewed and approved the scientific and technical information contained in this news release. Scott R.G. Parsons is a “Qualified Person” as defined by Canadian Securities Administrators’ National Instrument 43-101 – Standards of Disclosure for Mineral Projects.

Exploration programs at the Island Gold Mine are directed and supervised by Tyler Poulin, P.Geo., Geology Superintendent at the Island Gold Mine. Tyler Poulin is a “Qualified Person” as defined by Canadian Securities Administrators’ National Instrument 43-101 – Standards of Disclosure for Mineral Projects.

Quality Assurance and Quality Control 

Alamos Gold maintains an internal Quality Assurance / Quality Control (QA/QC) program at the Island Gold Mine to ensure sampling and analysis of all exploration work is conducted in accordance with best practices.

Access to the Island Gold Mine is controlled by security personnel. Drill core is logged and sampled at core logging facilities within the mine site under the supervision of a Qualified Geologist. A geologist marks the individual samples for analysis, and sample intervals, sample numbers, standards and blanks are entered into the database. Exploration core is cut in half using an electric core saw equipped with a diamond tipped blade. One half of the core is placed into a plastic sample bag and sealed with zip ties in preparation for shipment. The other half of the core is returned to the core box and retained for future reference. Approximately 20% of all delineation core is cut and stored, and the entire core sample is sent for analysis on all definition programs.

The samples are placed in large heavy-duty nylon reinforced Fabrene bags, which are identified and sealed before being placed on pallets. The core samples are picked up at the mine site and mine samples are delivered to AGAT and Actlabs laboratories, and regional samples are delivered to ALS laboratory, all located in Thunder Bay, Ontario.

Gold is analyzed by a 50 grams fire assay with an Atomic Absorption (AA) finish. Mine samples greater than 10.0 g/t Au, and regional samples greater than 5.0 g/t Au are re-analyzed using gravimetric finish methods. AGAT, Actlabs and ALS are certified laboratories and have internal quality control programs that include insertion of reagent blanks, reference materials, and pulp duplicates.

The Corporation inserts QC samples (blanks and reference materials) at regular intervals to monitor laboratory performance. Cross check assays are completed on a regular basis in a secondary accredited laboratory. The Island Gold Mine QA/QC procedures are more completely described in the August 29, 2022 Technical Report filed on SEDAR+ (www.sedarplus.ca).

About Alamos

Alamos is a Canadian-based intermediate gold producer with diversified production from three operations in North America. This includes the Island Gold District and Young-Davidson mine in northern Ontario, Canada, and the Mulatos District in Sonora State, Mexico. Additionally, the Company has a strong portfolio of growth projects, including the Phase 3+ Expansion at Island Gold, and the Lynn Lake project in Manitoba, Canada. Alamos employs more than 2,400 people and is committed to the highest standards of sustainable development. The Company’s shares are traded on the TSX and NYSE under the symbol “AGI”.

Table 1: Island Gold – Previously Unreleased Select Composite Intervals from Underground and Surface Mine Exploration Drilling

Composite intervals greater than 3 g/t Au weighted average.

Capping values: Island West (C-zone) and Island Main @ 230 g/t Au; Island Main and East (E1E Zone) @ 185 g/t Au; B Zone @ 120 g/t Au; E1D, NS1 Zone and NTH4 @ 100 g/t Au; E1D1 zone @ 90 g/t Au; NS2, NTH and NTH2 zone @ 35 g/t Au

Table 2: Island Gold – Previously Unreleased Select Composite Intervals from Underground Delineation Drilling

Composite intervals greater than 50 gram*metre. 

Capping values: Island Main and East (E1E Zone) @ 185 g/t Au

Table 3: Island Gold Regional Exploration – Previously Unreleased Select Composite Intervals from 2023-2025 Surface Exploration Drilling at Cline-Pick and Edwards.

Composite intervals greater than 3 g/t Au weighted average 

All reported composite intervals reported as uncut, and composites lengths are reported as core length. True width is estimated to be 40 to 85% of core length. Composites are calculated with a 0.5 g/t cut-off, maximum internal waste of 4 m, and no minimum length. Higher-grade intervals within the primary drillhole composite are reported as “Including” for any individual or consecutive samples with assay grades greater than 10 g/t Au. 

Table 4: Island Gold underground exploration and delineation, and surface exploration drill holes; azimuth, dip, drilled length, and collar location at surface (UTM NAD83).

Note: UTM mine surface elevation 393 m

Table 5: Surface regional exploration drill holes; azimuth, dip, drilled length, and collar location at surface (UTM NAD83).

Figure 1: Island Gold Mine – C/E1E Longitudinal: New Underground Exploration Drilling Highlights

Figure 2: Island Gold Mine – New Underground Exploration Drilling Highlights: Hanging Wall & Footwall Zones

Figure 3: Cline-Pick Mines Plan Map with current and historic drilling
A-A’ cross section reference (see Figure 4)

Figure 4: Cline- Pick Mines Longitudinal with current and historic drilling