Mosaic Announces Updated Channel Sampling Results at Golden Island, Including an Average Grade of 280.26 g/t Au over 0.5 m, and Provides a Drilling Progress Update

(CSE:MOC) Mosaic Minerals Corporation announced updated results from its channel sampling program on the Golden Island gold project in Abitibi, Quebec. The program consisted of 343 samples, mostly 0.5 m long, collected from 98 channels and analyzed by fire assay, with gravimetric and metallic sieve re-assays for the highest-grade samples. The company reported an average grade of 280.26 g/t Au over 0.5 m in sample C0380541 (channel 84), with gravimetric finish results of 154.70 g/t and 619.17 g/t Au, and 66.92 g/t Au by metallic sieve. Sample C0381259 (channel 6) returned an average grade of 82.07 g/t Au over 0.5 m, with gravimetric finish of 72.79 g/t Au, duplicate of 116.26 g/t Au, and 57.16 g/t Au by metallic sieve; this sample also contained 42.5 g/t Ag and 0.42% Cu. Sample C0381370 (channel 37) averaged 58.05 g/t Au over 0.5 m, with gravimetric finishes of 54.51 and 55.30 g/t Au, and 64.34 g/t Au by metallic sieve. In channel 61, four consecutive samples over 2.0 m returned 26.21, 61.97, 63.32, and 1.17 g/t Au by metallic sieve. The company identified 50 samples above 1 g/t Au in 35 channels, including 15 above 10 g/t Au in at least one assay. Metallic sieve assays revealed coarse gold, with sample C0381444 increasing from 6.20 to 34.83 g/t Au, C0381450 from 8.81 to 63.32 g/t, and C0381466 from 1.37 to 26.13 g/t. The ongoing drilling campaign of at least 2,000 metres on Golden Island, announced October 29, has surpassed 600 metres drilled in 2 holes to date. All core is logged and sampled as drilling progresses, with results to be released upon receipt and validation. The company inserted a control sample approximately every 20 samples, including 8 certified reference materials and 9 blanks; standards returned 4.01 to 4.25 g/t Au by gravimetric finish (average 4.13 g/t), and all blanks returned less than 5 ppb Au. Fire assay (AA finish) duplicates agreed within 10% for the 12 pairs above 50 ppb, and metallic sieve fine fraction assays agreed within 10% in most cases. The scientific and technical information was reviewed and approved by Ms. Suzie Tremblay, a member of the Ordre des géologues du Québec (OGQ No. 10664), Vice-President of Explo-Logik and consultant to Mosaic Minerals Corp. Jonathan Hamel, President and Chief Executive Officer of Mosaic, stated that the channel results are very encouraging, with gold above 1 g/t in 35 channels and several samples exceeding 50 g/t Au, and that the drilling pace is excellent. The company is advancing the Golden Island (Au), Amanda (Au), and Gaboury (Ni) projects in Abitibi and James Bay, Quebec.

Mosaic Begins a Drilling Campaign of at Least 2,000 Metres at Golden Island and Returns up to 72.8 g/t Au, 42.5 g/t Ag and 0.42% Cu at Surface

(CSE:MOC) Mosaic Minerals Corporation announced assay results for 343 samples collected during its summer 2026 exploration campaign on the Golden Island gold project in Abitibi, Quebec. The company reported gold grades of 72.79 g/t Au (sample C0381259) and 66.92 g/t Au (sample C0380541). Sample C0381259 also returned 42.5 g/t Ag and 0.42% Cu. Metallic screen re-assays confirmed the presence of coarse gold, with fractions grading up to 2,842 g/t Au. Of the 343 samples, 9 assayed above 10 g/t Au, 17 above 5 g/t Au, and 45 samples (13% of the total) exceeded 1 g/t Au. The company has commenced a diamond drilling campaign of at least 2,000 metres on Golden Island, with the drill rig and crew now on site. The drilling program will comprise a minimum of 2,000 metres in about a dozen holes, targeting the down-dip geometric extension of high-grade vein systems identified in trenches, to depths ranging from 150 to 300 metres. Best gold results include: C0381259 (72.79 g/t Au, 116.26 g/t Au duplicate, 42.5 g/t Ag, 4,220 ppm Cu), C0380541 (66.92 g/t Au, 154.70 g/t Au, 619.17 g/t Au gravimetric duplicates, 2.8 g/t Ag, 12 ppm Cu), C0381370 (54.51 g/t Au, 55.30 g/t Au duplicate, 0.8 g/t Ag, 16 ppm Cu), C0381442 (38.81 g/t Au, 44.95 g/t Au duplicate, 1.8 g/t Ag, 17 ppm Cu), and C0381449 (33.36 g/t Au, 32.43 g/t Au duplicate, 3.5 g/t Ag, 15 ppm Cu). Best silver results (≥ 2 g/t Ag) include: C0381259 (42.5 g/t Ag, 72.79 g/t Au, 4,220 ppm Cu), C0381265 (10.0 g/t Ag, 1.68 g/t Au, 212 ppm Cu), and C0381252 (8.9 g/t Ag, 7.75 g/t Au, 147 ppm Cu). Best copper results (≥ 150 ppm Cu) include: C0381259 (0.42% Cu, 4,220 ppm, 72.79 g/t Au, 42.5 g/t Ag), C0381318 (0.17% Cu, 1,740 ppm, 0.04 g/t Au, 0.9 g/t Ag), and C0381324 (0.05% Cu, 532 ppm, 0.08 g/t Au, 1.8 g/t Ag). The 343 samples were collected from a mechanical stripping and historical trench cleaning campaign, with samples mainly consisting of continuous channels averaging 0.5 metre in length. The mineralization is hosted in a blue quartz-eye granodiorite, with a complex network of shear veins, sub-vertical tension veins, and stockwork zones, often with pyrite, hematization, and visible gold. Samples were analyzed at Laboratoire Expert Inc. in Rouyn-Noranda using fire assay with atomic absorption finish, gravimetric finish, and metallic screen methods. Mosaic applied a quality control protocol by inserting certified reference materials and blanks at a rate of approximately one control per 20 samples, with no contamination detected. The scientific and technical content was reviewed and approved by Suzie Tremblay, Géo/P.Geo, qualified person as defined by NI 43-101, OGQ #10664. Jonathan Hamel is President and CEO of Mosaic Minerals Corporation.

Mosaic Closes $1.36M Oversubscribed Private Placement

(CSE:MOC) Mosaic Minerals Corporation announced the closing of the final tranche of a private placement of units and flow-through units, raising aggregate gross proceeds of $1,360,251. The offering was oversubscribed by 36% above the original financing target. In the final tranche, the company issued 2,750,000 flow-through units at a price of $0.105 per FT Unit and 3,360,000 units at a price of $0.085 per Unit, for gross proceeds of $574,350. Including the first and second tranches, the total raised under the offering was $1,360,251. Each FT Unit consists of one common share issued as a flow-through share and one common share purchase warrant, with each warrant entitling the holder to purchase one common share at a price of $0.17 for 12 months from issuance. Each Unit consists of one common share and one common share purchase warrant, with each warrant entitling the holder to purchase one common share at a price of $0.12 for 24 months from issuance. Jonathan Hamel, President, CEO, and Director, purchased directly 800,000 Flow-Through Units for aggregate consideration of $84,000. The participation of insiders in the offering constitutes a related party transaction under Multilateral Instrument 61-101 but is exempt from formal valuation and minority approval requirements as neither the fair market value of the securities issued to, nor the consideration paid by, the insiders exceeded 25% of the company's market capitalization. The company did not file a material change report with respect to the insider participation at least 21 days prior to closing as the insider participation was not determined at that time. Gross proceeds from the sale of FT Units will be used to incur eligible Canadian exploration expenses on the Golden Island project in Quebec, Canada, qualifying as flow-through mining expenditures, and all eligible expenditures will be renounced in favor of FT Unit subscribers effective December 31, 2026. In connection with the offering, the company paid a 6% cash finder's fee totaling $46,056 and issued 469,835 finder's warrants to four arm's-length finders, with each finder's warrant exercisable to acquire one additional common share at a price of $0.085 per warrant for 24 months from issuance. All securities issued in connection with the offering are subject to a hold period of four months and one day, ending on January 22, 2027, or February 2, 2027, or February 17, 2027. The offering is subject to final approval by the Canadian Securities Exchange. The company is developing the Golden Island (Au), Amanda (Au), and Gaboury (Ni) projects located in Abitibi and James Bay, Quebec.

Mosaic Closes Second Tranche of a Private Placement

(CSE:MOC) Mosaic Minerals Corporation announced the closing of a second tranche of a private placement consisting of 1,100,000 flow-through units at $0.105 per FT Unit and 982,000 units at $0.085 per Unit, for total gross proceeds of $198,470. Each FT Unit includes one common share issued as a flow-through share and one common share purchase warrant, with each warrant exercisable at $0.17 for 12 months. Each Unit includes one common share and one common share purchase warrant, with each warrant exercisable at $0.12 for 24 months. The gross proceeds from FT Units will be used to incur eligible Canadian exploration expenses on the Golden Island project and other projects in Quebec, Canada, qualifying as flow-through mining expenditures under the Income Tax Act (Canada). All eligible expenditures will be renounced in favor of FT Unit subscribers effective December 31, 2026. Jonathan Hamel, President, CEO and Director, purchased 800,000 Flow-Through Units for $84,000. Insider participation in the offering is considered a related party transaction under MI 61-101 but is exempt from formal valuation and minority approval requirements as neither the fair market value of securities issued to, nor the consideration paid by, insiders exceeded 25% of the Company's market capitalization. The Company did not file a material change report 21 days prior to closing as insider participation was not determined at that time. A 6% cash finder's fee totaling $1,890 was paid, and 22,235 finder's warrants were issued to two arm's-length finders, each exercisable at $0.085 for 24 months. All securities issued are subject to a hold period of four months and one day, ending February 2, 2027. The offering is subject to final approval by the Canadian Securities Exchange (CSE). Mosaic Minerals Corporation is developing the Golden Island (Au), Amanda (Au), and Gaboury (Ni) projects in Abitibi and James Bay, Quebec.

Mosaic Closes a First Tranche of a Private Placement and Prepares to Drill on Golden Island

(CSE:MOC) Mosaic Minerals Corporation announced the closing of an initial tranche of a private placement consisting of 3,526,190 flow-through units at $0.0105 per FT Unit and 2,609,191 units at $0.085 per Unit, for aggregate gross proceeds of $592,031. Each FT Unit includes one flow-through common share and one warrant, with each warrant exercisable at $0.17 for 12 months. Each Unit includes one common share and one warrant, with each warrant exercisable at $0.12 for 24 months. The gross proceeds from FT Units will be used for eligible Canadian exploration expenses on the Golden Island project in Quebec, Canada, and all eligible expenditures will be renounced to FT Unit subscribers effective December 31, 2026. The company paid an 8% cash finder's fee totaling $20,160 and issued 192,000 finder's warrants, each exercisable at $0.085 for 24 months, to two arm's-length finders. All securities issued are subject to a hold period of four months and one day, ending January 22, 2027. The offering is subject to final approval by the Canadian Securities Exchange. Mosaic has completed technical field work and exploration to prepare for its initial drilling campaign at the Golden Island gold project in Abitibi, Quebec. Highlights include the discovery of new gold-bearing zones in the southwest extension of the main showing, recurring visible gold in multiple channel samples, confirmation of a complex structural network within a mineralized granodiorite matrix, and identification of a major geophysical corridor exceeding 1 km in length. A historical drill hole intersected 1.13 g/t Au over 5.60 m. Over 340 channel samples have been collected and sent for analysis, with results expected in the coming weeks. The company is planning a fully funded initial drilling campaign of at least 2,500 meters, targeting areas near historical SOQUEM drill holes from 1982 and the newly discovered gold-bearing zone. The initial campaign aims for 10 holes with a minimum depth of 250 meters per hole, totaling 2,500 meters. Jonathan Hamel, President and CEO of Mosaic, stated that the initial drilling campaign is essential at this stage and is targeted to launch as soon as possible to take advantage of the autumn season. The scientific and technical information in the release was reviewed and approved by Robert Gagnon, P.Geo, Director of Mosaic Minerals and qualified person under NI 43-101.

Mosaic Observes Visible Gold and Identifies New Gold Zones During Its Surface Work on Its Golden Island Project

(CSE: MOC) Mosaic Minerals Corporation announced the successful completion of a first phase of stripping, mapping, and channel sampling work on its Île d'Or gold property, located in Abitibi, Quebec. The company discovered new gold zones in the southwestern extension of the main showing and observed recurrent presence of visible gold within multiple sampling channels. More than 340 channel samples were collected and shipped for analysis. A major geophysical corridor of over 1 km associating a high-amplitude magnetic anomaly and a VLF electromagnetic conductor was identified, historically validated by a drill hole that intersected 1.13 g/t Au over 5.60 m. Historical drilling by SOQUEM in the NE-SW corridor demonstrated significant gold grades within the host granodiorite, including intersections such as 1.18 g/t Au over 17.7 m and 2.99 g/t Au over 5.6 m. A high-precision GPS geodetic positioning survey was carried out to accurately georeference all historical trenches, the original exploration shaft, the adit entrance, and the collars of the 1982 SOQUEM drill holes. The company plans an upcoming diamond drilling campaign scheduled for the fall of 2026.

Mosaic Minerals Announces Start of Exploration Work on Its Golden Island Gold Property

(CSE: MOC) Mosaic Minerals Corporation announced the start of its summer exploration campaign on its Golden Island gold property. Field crews are currently deployed on site to begin preliminary work for the season, including clearing access roads and cleaning historical trenches. The campaign is officially scheduled to run from June 16 until the end of July and will include a GPS survey of all historical trenches, the original shaft, the underground gallery entrance, and the old drill collars drilled by SOQUEM. In 1982, SOQUEM completed a short program of 8 drill holes (1,150 meters), with notable results such as 17.7 meters at 1.18 g/t Au and 25.9 meters at 1.42 g/t Au. Sampling work carried out in the fall of 2024 collected a total of 25 selected samples, with best results including 101.19 g/t Au, 96.13 g/t Au, and 56.69 g/t Au. The company also plans to collect mini-bulk samples of approximately 500 kg each from various identified areas to be processed in a small pilot plant. The company projects that mini-bulk testing will allow for a much more accurate representation of the system's gold content.