# Alamos Gold Extends High Grade Mineralization Across Multiple Targets within the Island Gold District which Represent Upside as Potential Sources of Additional Higher Grade Mill Fe

Source Brief: https://evesgoldminers.com/research/source-briefs/alamos-gold-2026-06-22-alamos-gold-extends-high-grade-mineralization-across-multi-6e0a10a1
Original source: https://www.alamosgold.com/news-and-events/news/news-details/2026/Alamos-Gold-Extends-High-Grade-Mineralization-Across-Multiple-Targets-within-the-Island-Gold-District-which-Represent-Upside-as-Potential-Sources-of-Additional-Higher-Grade-Mill-Feed/default.aspx
Original published: 2026-06-22
EGM generated: 2026-09-04
Company: Alamos Gold (AGI)

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Source: https://www.alamosgold.com/news-and-events/news/news-details/2026/Alamos-Gold-Extends-High-Grade-Mineralization-Across-Multiple-Targets-within-the-Island-Gold-District-which-Represent-Upside-as-Potential-Sources-of-Additional-Higher-Grade-Mill-Feed/default.aspx
Published: 2026-06-22T10:55:40+00:00
Fetched: 2026-06-22T11:03:04.301+00:00
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All amounts are in United States dollars, unless otherwise stated TORONTO, June 22, 2026 (GLOBE NEWSWIRE) -- Alamos Gold Inc. ( TSX:AGI; NYSE:AGI ) (“Alamos” or the “Company”) today reported new results from underground and surface exploration drilling at the Island Gold Mine. Exploration drilling has defined high-grade mineralization across multiple areas which are being targeted as sources of additional higher-grade mill feed within the expanded Magino mill. This includes defining a new zone of high-grade mineralization 250 metres (“m”) west of underground Mineral Reserves and Mineral Resources (Island Gold West Extension), and continuing to extend mineralization within the Island West up-plunge area. Given its proximity to surface, Island West up-plunge can be mined utilizing the ramp, providing further upside potential in terms of combined underground mining rates. Additionally, the regional exploration program continues to intersect high-grade gold mineralization at the past-producing Cline-Pick, and Edwards mines, located seven kilometres (“km”) from the Magino Mill (see Figure 1). "As outlined in the Expansion Study, the Island Gold District is expected to become one of the largest and lowest cost gold operations in Canada. Given our ongoing exploration success within the main Island Gold structure, and across multiple near mine targets, we expect there is further production growth to come. With multiple higher grade targets being defined within proximity to the Magino mill, and an expansion underway that will provide more than enough mill capacity, we see excellent potential to drive production higher by further increasing the proportion of higher-grade ore that will be processed within the expanded circuit,” said John A. McCluskey, President and Chief Executive Officer. Island Gold West Extension Zone: high-grade mineralization has been intersected within a newly defined zone measuring approximately 200 by 300 m based on drilling to date. This new zone is located approximately 250 m to as much as 500 m along strike to the west of the existing Mineral Reserves and Resources of the Island Gold Deposit, and south of the Magino deposit. The zone remains open down-plunge and to the west, with drilling continuing to target extensions of the mineralization. New highlights include 1 : Island West Extension Zone: 12.05 g/t Au over 5.20 m (MX26-031) including; 36.67 g/t Au over 1.50 m. 8.07 g/t Au over 5.60 m (MX26-035W) including; 45.90 g/t Au over 0.60 m; and 30.20 g/t Au over 0.45 m. Island West up-plunge: drilling continues to expand high-grade gold mineralization across multiple zones (C, D1, DN2, G1, G10). Given its proximity to surface, and the ability to be mined via the ramp system, the Island West up-plunge area represents significant opportunity to increase combined underground mining rates beyond the 3,000 tonnes per day (“tpd”) that is expected to be mined and skipped to surface via the shaft. This would support further production growth by increasing the proportion of higher-grade ore to be processed within the expanded Magino mill. New highlights include 2 : 14.51 g/t Au (4.60 g/t cut) over 5.21 m (850-482-05); 4.55 g/t Au (3.95 g/t cut) over 16.05 m (850-472-41); 12.56 g/t Au (7.76 g/t cut) over 4.73 m (850-482-08); 27.11 g/t Au (8.15 g/t cut) over 1.65 m (790-446-05); 18.66 g/t Au over 2.30 m (MX26-036); 8.53 g/t Au over 4.32 m (790-460-31); and 3.30 g/t Au over 9.71 m (790-460-32). Island West up-plunge unknown zones: high-grade mineralization intersected across multiple yet to be defined zones in both the hanging wall and footwall (“Unknown Zones”). Additional drilling will be focused on defining these new zones through further assessing the geometry and continuity of these zones. New highlights include 1 : 20.94 g/t Au over 5.30 m (850-482-07); 30.47 g/t Au over 2.65 m (790-460-41); 16.28 g/t Au over 4.60 m (850-482-08); 6.66 g/t Au over 7.70 m (850-472-61); 17.24 g/t Au over 2.30 m (850-472-76); and 7.64 g/t Au over 5.15 m (850-482-07). Island Gold NS1 and NS4 Zone: high-grade gold mineralization intersected within new and recently defined hanging wall zones, NS1 and NS4. These zones are low-cost to develop, given their proximity to existing infrastructure. The NS1 Zone extends into the Island West up-plunge target area representing an additional opportunity to access high-grade ore from the existing ramp system. As exploration on the NS4 zone advances up-plunge, there is also the potential for this zone to extend into the Island West up plunge area. New highlights include 2 : NS1 Zone: 19.48 g/t Au (7.17 g/t cut) over 11.63 m (850-472-61); and 7.70 g/t Au over 5.02 m (1025-492-29). NS4 Zone: growing parallel structure 180 m west of NS1 Zone 132.90 g/t Au (11.51 g/t cut) over 2.21 m (850-472-76); 23.56 g/t Au (12.27 g/t cut) over 3.26 m (850-470-30); 19.43 g/t Au (5.13 g/t cut) over 2.97 m (850-470-26); 10.18 g/t Au over 3.50 m (850-470-21); and 12.71 g/t Au over 2.64 m (850-470-31). Cline-Pick Mine regional drilling: continues to extend high-grade gold mineralization beyond the extent of previous mining and following up on the best hole drilled to date announced earlier this year which intersected 178.07 g/t Au over 3.54 m (25IGX128). The targets remain open in multiple directions, including at depth, with the deepest holes drilled to date down to a vertical depth of only 540 m. The Cline-Pick, and adjacent past producing Edwards Mine are located within 7 km of the Magino mill and are being targeted as potential sources of additional higher-grade mill feed within the expanded mill. New highlights include 3 : Cline-Pick Mines: 67.93 g/t Au over 3.05 m (26IGX143) including; 127.72 g/t Au over 1.35 m. 5.63 g/t Au over 10.77 m (26IGX136) including; 24.70 g/t Au over 2.12 m. 62.20 g/t Au over 0.98 m (25IGX128EXT) including; 114.00 g/t Au over 0.38 m; and 9.18 g/t Au over 3.55 m including; 72.30 g/t Au over 0.43 m. 4.70 g/t Au over 11.85 m (26IGX137) including; 9.28 g/t Au over 5.65 m; and 8.28 g/t Au over 5.05 m including; 15.71 g/t Au over 2.60 m; and 36.80 g/t Au over 0.79 m; 2.93 g/t Au over 14.41 m (26IGX138) including; 13.48 g/t Au over 2.07 m; and 11.89 g/t Au over 2.45 m (26IGX140) including; 50.20 g/t Au over 0.52 m. Edwards Mine: 5.06 g/t Au over 13.60 m (25IGX133) including; 35.40 g/t Au over 0.80 m; and 5.96 g/t Au over 2.25 m including; 10.30 g/t Au over 1.10 m. 88-60 Zone: 24.12 g/t Au over 3.88 m (26IGX136) including; 63.50 g/t Au over 1.42 m. 1 All reported composite intervals are composite core length , and gold grades are reported as uncut . 2 All reported composite intervals are calculated true width of the mineralized zones. Drillhole composite intervals reported as “cut” include higher grade samples which have been cut to: Island West (C-zone) and Island Main @ 230 g/t Au; B and NS1 Zone @ 90 g/t Au; D1 and G1 zone @ 45 g/t Au; G10 Z one @ 25 g/t Au, NS4 Zone @48 g/t Au; DN and DN2 @ 35 g/t Au. 3 All reported composite intervals reported as uncut, and composites lengths are reported as core length. True width is estimated to be 40 - 85% of core length unless otherwise indicated. Composites are calculated with a 0.5 g/t cut-off, maximum internal waste of 4 m, and no minimum length. New highlight intercepts can be found in Tables 1 and 2, and in Figures 1 to 6 at the end of this news release. 2026 Exploration Drilling Program A total of $43 million has been budgeted for exploration at the Island Gold District in 2026, up from $24 million spent in 2025. A significant focus of the 2025 drilling program at Island Gold and Magino was on delineation drilling to convert the large Inferred Mineral Resource base to Mineral Reserves. This program was executed successfully and resulted in a significant increase in Mineral Reserves at both Island Gold and Magino, which was incorporated into the Island Gold District Expansion Study announced on February 3, 2026. With the deposit open laterally and at depth, there is significant potential for further growth in Mineral Reserves and Resources. A total of 50,000 m of underground exploration drilling is planned in 2026 with a focus on defining new Mineral Reserves and Resources in proximity to existing production horizons and infrastructure. This includes drilling across the strike extent of the main Island Gold deposit (E1E and C-Zones), as well as within a growing number of newly defined hanging wall and footwall zones. To support the underground exploration program, 1,090 m of underground exploration drift development is planned to extend drill platforms on multiple levels. Additionally, 48,000 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. The regional exploration program at the Island Gold District includes 16,000 m of surface drilling. The focus of the regional program will be following up on high-grade mineralization intersected in the 2025 drill program at Cline and Pick, which are located approximately 7 km northeast Magino mill. Drilling will also be completed at the historic Edwards mine, located in proximity to the Cline and Pick mines with the objective of extending mineralization beyond historically mined areas. Additionally, drilling will 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. As of June 1, 2026, a total of 17,760 m of underground drilling was completed in 66 holes. Additionally, 13,023 m of surface exploration drilling has been completed in 17 holes focused on expansion of Island Gold to the east, west, and down-plunge. As part of the regional exploration program, 8,123 m of drilling has been completed in 13 holes and two extension holes. The focus of this press release is on the variety of higher-grade upside opportunities that are being targeted beyond the main Island Gold underground structure. Ongoing success within the main structure is expected to support further growth in Mineral Reserves and Resources as drilling continues to advance across multiple areas, including Island East and down-plunge. Results from drilling within the main structure are expected to be released later in 2026. Island Gold West Extension High-grade mineralization was intersected in a new zone from seven holes (six surface and one underground), spaced approximately 40 m to 100 m apart. Assays are pending from four of the surface holes. This new zone is located 300 m along strike to the west of the current Island Gold Mine Mineral Reserves and Resources, and has currently been tested between 750 and 1,000 m from surface. Based on the initial drilling this new zone has been defined over an extent of approximately 200 m by 300 m and is open to the west and down-plunge. This zone is in an area that has seen very limited exploration, to the west of the “Creek Fault”, south of the Webb Lake Stock, and the Magino deposit. Only one historic hole (AR-390-01) was completed in this target area by Alamos in 2018, which intersected 7.03 g/t over 5.50 m including 38.74 g/t Au over 0.70 m, and was classified as an “Unknown” zone at that time. Drilling will continue in this area from both surface and from underground drill platforms established in the western portion of the Island Gold Mine on the 490 and 790-levels. New highlights include 1 (Figure 2, Table 1): Island West Extension Zone: 12.05 g/t Au over 5.20 m (MX26
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