Mr. Kevin Keough reports

ORETERRA COMPLETES AIRBORNE GEOPHYSICAL SURVEY OF THE KINKAID CU-AU-AG PROJECT, NEVADA, IDENTIFIES SIGNIFICANT NEW PORPHYRY TARGET

Oreterra Metals Corp. has completed additional fieldwork including an airborne magnetic and radiometric survey over its 100-per-cent-owned, road-accessible Kinkaid project in Nevada's Walker Lane trend. The new work was carried out in follow up to highly encouraging previous results (see news dated March 17, 2026, and Aug. 7, 2025), which outlined multiple epithermal gold-silver and potential underlying porphyry copper-gold-silver targets. Importantly, the airborne survey and recently completed mapping and sampling have identified new, large-scale porphyry and epithermal targets in addition to those previously identified.

"The results of the airborne geophysical survey combined with the recent discovery of numerous additional copper-gold-silver showings have generated a significant new porphyry target as well as firming up the signature of several previously suspected centres," noted John Biczok, Oreterra's vice-president of exploration. "The project now warrants ground geophysical surveys (induced polarization plus magnetotelluric) over at least five targets thought to represent the main porphyry targets and the exposed epithermal gold zones overlying some of them, with the goal of generating drill targets for initial testing as early as next year."

"Kinkaid has progressed rapidly," said Kevin Keough, Oreterra's chief executive officer. "It now provides the company with a second really outstanding, near drill-ready copper-gold-silver property with apparent porphyry-epithermal targets of considerable scale, to complement our high-profile Trek South porphyry copper-gold-silver discovery prospect in B.C.'s Golden Triangle, where first-ever drilling will commence within weeks."

A detailed corporate presentation on the Kinkaid project and a table of the April to May, 2026, assay results discussed in this news release are available on the company's website.

Airborne geophysical survey highlights

• A low-level helicopter-borne magnetic and radiometric survey was completed in May across the entire Kinkaid property. The survey identified several large new targets in addition to outlining the geophysical signature of previously suspected porphyry centres.
• The radiometric survey effectively outlined the potassic signature created by sericite alteration associated with known copper-gold mineralization on the property:
  • A prominent 1.7-by-1.0-kilometre potassic anomaly was outlined over the postulated Bismark Hill-Southern Barite porphyry target.
  • Another significant potassic anomaly with a coincident magnetic low measuring 1.2 by 0.9 km, was outlined in a new area only recently investigated by the company. Widespread copper prospects and potentially significant alteration patterns were noted across this area in April, 2026, and limited initial sampling here has returned gold assays from trace to 7.59 gram per tonne Au, copper values from 0.09 per cent to greater than 1 per cent Cu, and several high values of mercury and antimony. Apparent porphyry-style B veins were observed at one site. Results of further sampling conducted in June are pending; maps and full details of this new target will be presented when assays are received and compiled.

Sampling highlights

Bismark Hill gold zone:

• A series of one-metre-wide chip samples taken across a 15-metre-wide section of sericitized felsic volcanics hosting the recently discovered Bismark epithermal gold zone returned weighted, composite assays of 0.87 gram per tonne Au over 15 metres, including 1.18 g/t Au over 10 metres and 2.05 g/t Au over five metres.
• Five samples of red, quartz veined and pyritic, hematitic nodules scattered throughout the sericitized zone, assayed from 2.77 g/t Au to 22.48 g/t Au, adding to the company's previous sample results of up to 50.5 g/t Au (see news dated March 17, 2026). These nodules are up to 12 centimetres across and are believed to host the great majority of gold in this zone. Future work including an IP survey will aim to determine if these nodules are related to a more pervasive, high-grade mineralized zone at depth.
• The mineralized exposure at the Bismark Hill gold zone is part of a greater than 300 m wide cluster of altered and variably mineralized gold and copper prospects within the larger, 1.7 by 1.0 km wide, postulated Bismark Hill-Southern Barite porphyry system indicated by mineralized showings, geophysical results, satellite short-wave infrared patterns and visible discolouration.

PM skarn and gold zone

• Follow-up sampling of the gold-bearing chalcedonic quartz flooding/veins and manganese oxide cemented breccias in this 20- to 30-metre-wide zone discovered in 2024 (see news dated Aug. 27, 2024) returned a property-high assay of 31.16 g/t Au from a non-descript float boulder of chalcedonic vein and 1.34 g/t Au from a breccia sample.
• Gold mineralization in this zone now appears largely confined to the chalcedonic quartz that forms flooded zones and veins cutting the local quartzite, as well as local intervals of brecciated quartzite cemented by manganese oxides. Samples of other quartz vein styles are generally barren. The zone is primarily a 20- to 30-metre-wide, northwest-southeast linear trend of in-place or locally derived boulders with minor outcrops, flanked by several metres of sporadically gold-bearing brecciated quartzite on its northeast margin and exposed for a strike length of about 50 metres. A small dump at an old prospect pit a further 40 metres along strike to the southeast contains very high-grade, epithermal vein material assaying 93.5 to 1,725 g/t silver, as well as high levels of antimony, copper, lead, mercury and zinc (see news dated March 10, 2022).
• Fieldwork in June, 2026, located the probable strike extension of the PM gold zone 110 metres to the northwest of the original discovery. A 10-metre-wide zone here is littered with fragments of agate quartz and local chalcedonic quartz. Agate-type quartz is known to form in the upper portion of some epithermal gold vein systems; assays from the June samples are pending. With the discovery of this new site the total length of the exposed PM epithermal vein system is now believed to be at least 200 metres.
• The PM gold zone lies along the margins of an anomalous discoloured area measuring at least 900 by 400 metres, containing numerous historic gold-tungsten mines and prospects. An IP plus MT survey is now being planned to test both this broad anomaly for its underlying skarn and porphyry potential and the extent of the adjacent epithermal gold vein system.

Montreal Mine North

A 500-metre-long series of at least 10 old prospect pits and trenches trending NNE (north-northeast) from the main Montreal mine workings was examined in May, 2026. Almost all of these northern prospects consist of multiple north-northeast-trending quartz veins up to 60 cm wide with extensive secondary copper minerals, some relic chalcopyrite and relatively minor alteration compared with the intense sericite alteration at the main workings.

• Ten of the 17 chip and grab samples collected from veins in this area assayed greater than 1 per cent Cu and the other five copper-bearing samples assayed 0.2 to 0.63 per cent Cu. In addition, 10 samples assayed from 0.82 to 12.54 g/t Au and eight samples assayed from 14.7 to greater than 1,000 g/t silver (Ag).
• Importantly, some of the samples also contained highly anomalous levels of bismuth (four samples from 143 parts per million to greater than 2,000 ppm Bi), mercury (seven samples from 252 to greater than 50,000 parts per billion Hg) and antimony (three samples from 76 to 637 ppm Sb). These metals indicate that these northern showings have a more epithermal (shallow, low temperature) signature than the main mine workings to the south.
• Highly mineralized Cu-Au plus or minus Ag prospects and old mine workings have now been traced over a one km long linear trend at the Montreal mine. The presence of significant copper levels along with the precious metals strongly suggests that the mineralization has a magmatic source, presumed to be a porphyry copper type system at depth. Ground geophysical surveys (IP plus MT) are planned over this target area in the fall in an effort to outline this system.

* Readers should note that grab samples are by their nature selective, and despite the company's best efforts may not always be representative of the true style and overall grade of mineralization.

QA/QC (quality assurance/quality control)

Rock samples reported herein were a mix of chip and grab samples considered generally representative of the various old mine dumps, veins and outcrops being sampled. The samples collected in the 2026 program and discussed in this document were submitted to the Standards Council of Canada ISO/IEC 17025:2017 accredited Bureau Veritas laboratory in Reno, Nev., and Vancouver, B.C. A rigorous quality assurance and quality control program was implemented in the form of blanks and certified reference material standards inserted at every 10th position in the sample series. The assay results of these standards and blanks have been within the acceptable ranges.

Qualified person

The technical information in this news release has been reviewed and approved by John Biczok, PGeo, vice-president, exploration, for Oreterra Metals and a qualified person as defined by National Instrument 43-101. In addition to his extensive experience with several major mining companies exploring for a wide variety of ore deposit types across Canada and India, Mr. Biczok spent 12 years conducting exploration and research at the Musselwhite gold mine in Northwest Ontario, and has lead the teams conducting all of the company's fieldwork at Kinkaid.

About Oreterra Metals Corp.

Oreterra Metals is a TSX Venture Exchange-listed mineral exploration company focused primarily on gold, copper and silver. The company holds several wholly owned porphyry copper-gold prospects in British Columbia's Golden Triangle, the most significant of which is the newly identified Trek South prospect located to the southeast of Teck-Newmont's Galore Creek project, currently undergoing prefeasibility studies. Following a highly successful $9.7-million financing closed earlier in the year, a maiden two-phase, approximately 10,000-metre drill program at Trek South is now fully financed, for execution commencing July 16, 2026. Drilling will test the 1.6-kilometre-wide zone of porphyry-style alteration, mineralization, and underlying coincident strong IP, MT and magnetic anomalies present at Trek South. In addition, the first significant exploration work since 2007 is now planned for Oreterra's JW porphyry prospect, located six km northwest of Galore Creek.

Additional wholly owned interests include two former producers in Nevada: the Kinkaid claims in the Walker Lane trend covering numerous shallow Au-Cu-Ag workings over what is believed to be one or more porphyry centres, and the Scossa mine property in the Sleeper trend which is a former high-grade gold producer. The company also holds a 100-per-cent interest in the large-scale Lundmark-Akow Lake Au-Cu property adjacent to the northwest of the Musselwhite mine, where drilling by the company has produced highly encouraging, broad volcanogenic-massive-sulphide-style Au-Cu intersections. Oreterra also retains a continuing interest in several properties including a 2-per-cent NSR on McEwen Mining's Hislop gold property in Ontario and a 2-per-cent NSR on Enduro Metals' Newmont Lake Au-Cu-Ag property in B.C. (Technical presentations on each of the Kinkaid, Scossa and Lundmark-Akow Lake properties, authored by J. Biczok, P.Geo, are available at the company's website.)

We seek Safe Harbor.