Heritage Mining Announces High-Grade Gold Results from Melba Project Drilling

VANCOUVER, BC — May 6, 2026 — Leads & Copy —

Heritage Mining Ltd. (CSE: HML FRA: Y66) has announced results from its ongoing drilling program at the Melba Project, located approximately 22km northeast of Kirkland Lake and 90km southeast of Timmins in Northeastern Ontario, Canada.

Assays are reported from drill hole ML3855-001, which returned 9.34g/t Au over 2.00m from 67m (including 18.25g/t Au over 1.00m from 67.0m), with visible gold noted in the core. Also, 6.07g/t Au over 2m from 92.50m (including 21.74g/t Au over 0.50m from 93m) with visible gold noted in core, and 1.33g/t Au over 1.5m from 97m with visible gold noted in core.

Drill hole M3800-001 has been completed, and the core is being processed for assay. M3800-002 will commence drilling soon. The Company will be undertaking oriented core measurements to determine the strike and dip of the multiple vein sets.

Peter Schloo, President, CEO and Director of Heritage, commented that multiple high-grade intervals have been returned from multiple visible gold intersections in drill hole ML3855-001. He added that recently completed drill hole ML3800-001 tested the Company’s concept of a “stacked vein system” at Melba and drill hole ML3800-002 will test deeper levels of the veins intersected in ML3800-001. He also stated that the Company continues to believe that the broader zones of quartz veins and veinlets could converge into a much larger mineralized system at Melba.

Gold mineralization occurs within a Rhyolitic Tuff/Fragmental lithology comprising yellow-grey strongly siliceous, fragmental lithologies interbedded with narrow intervals of lithic wacke. Visible gold was observed in DDH ML3855-001 at 67.80m in a brecciated/sheared quartz vein (70deg) TCA that returned 9.34g/t Au over 2.00m from 67m (Including 18.25g/t Au over 1.00m from 67.0m). The “Blue Vein” is a brecciated, sheared quartz vein with localized, cm-scale fault gouge. Multiple occurrences of visible gold were also observed in the Blue Vein (ML3855-001), which assayed 6.07g/t Au over 2m from 92.50m (Including 21.74g/t Au over 0.50m from 93m).

The mineralized zone is strongly structurally controlled, containing multi-generational veins hosting breccia-, shear- and extension-related features. Vein morphologies and overprinting relationships are products of multiple fluid ingress events, which are characteristic of large orogenic-style gold deposits globally. Diamond drill intersections suggest a braided system of shear-hosted veins with intervening altered wall-rocks in the damage zones. The braided character of the veins and the historical mapping from Melba underground workings have imparted variable orientations to mineralized and wall-rock structures, which will be assessed with a forward program of oriented core drilling.

The Melba project is located approximately 22km northeast from Kirkland Lake and 90km southeast of Timmins in Northeastern Ontario, Canada. The project is comprised of ~3,886Ha and lies along the Ross Fault, which is a splay off the Porcupine-Destor Fault Zone and is associated with development-stage and historic producing gold mines: McEwen Mine (Grey Fox Mine, +1Moz Au) ~22km away, and the Ross Mine (+1Moz Au) ~16km away.

Heritage Mining adheres to a strict QA/QC protocol for handling, sampling, sample transportation and analyses. Chain-of-custody protocols are designed to ensure security of samples until their delivery at the laboratory. Drill core was boxed, covered and sealed at the drill rig site, labelled with the official drillhole name and identified in numerical sequence. Wooden blocks with the corresponding down hole meterage were inserted after every drill run. Drill core boxes were transported by drilling contactors to the onsite logging facility.

All drilling at the Melba project recovers NQ core. Drill core is systematically cut in half using a diamond saw. A qualified geologist examines the drill core, marking intervals for sampling and indicating the cutting line. Sample lengths are typically 1.0 metre, adjusted to a minimum length of 0.5 metre. One half of the core is retained as a witness sample, while the other half is submitted for analysis. Individual sample bags are securely sealed and placed into sealed rice bags, which are then clearly marked with their contents.

Heritage Mining submits samples for gold determination by PhotonAssay to Paragon Geochemical - Timmins. Analytical Procedures involve lab applying preparation codes INV-SAM (sample logging via barcode), PREP-PKG (weigh, dry at 100C, crushing to 70% passing 2mm, riffle split ~500g into a PA jar and 250g for pulverization to 85% passing 75 micron) followed by analytical code Au-PA01 which is a non-destructive gold analysis method using high-energy X-rays with a gold detection range from 0.015 ppm to 350ppm. After gold assays are returned, Heritage then may choose to perform multi-element assays on selected samples based on the gold results first with Paragon. In these cases, an aliquot is taken from the previously prepared 250g split for analysis by 48MA-MS (4 acid digestion followed by multi-element ICP-MS analysis for a 48 element suite).

Stephen Hughes, P Geo, Strategic Advisor for the Company, serves as a qualified person as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects and has reviewed the scientific and technical information in this news release, approving the disclosure herein.

The Company is a Canadian mineral exploration company advancing its Ontario Project Portfolio in Northwestern and Northeastern Ontario. The Drayton-Black Lake, Contact Bay and Scattergood projects are located near Sioux Lookout in the underexplored Eagle-Wabigoon-Manitou Greenstone Belt. The Melba Property is located near Ramore, Ontario. All Projects benefit from a wealth of historic data, excellent site access and logistical support from the local community.

Source: Heritage Mining Ltd.