Mr. Graham Downs of Cascadia reports

CASCADIA AND GRANITE CREEK COMPLETE BUSINESS COMBINATION

Cascadia Minerals Ltd. has completed an acquisition of all of the issued and outstanding common shares of Granite Creek Copper Ltd. pursuant to a court-approved plan of arrangement under the Business Corporations Act (British Columbia). The arrangement, which became effective as of today's date, merges Granite Creek into Cascadia to create a leading Yukon copper-gold exploration and development company.

Graham Downs, president and chief executive officer of Cascadia, commented: "We are very excited to complete this merger, and we welcome Granite Creek shareholders to Cascadia. The combined property portfolio provides our shareholders with exposure to an advanced-stage copper-gold deposit at the Carmacks property and a compelling collection of discovery-stage copper-gold and epithermal gold projects throughout Yukon's underexplored Stikine terrane. Planning is well under way for a fully financed fall drill program at Carmacks that will focus on stepout drilling near high-grade portions of the deposit. In the meantime, crews are conducting prospecting work at our Macks, Milner, Idaho Creek and Rosy properties while we await results from our spring drilling at Catch."

Upon completion of the arrangement, each Granite Creek shareholder received 0.25 of a Cascadia common share in exchange for each previously held Granite Creek share, with Cascadia issuing a total of 53,070,848 Cascadia shares to former Granite Creek shareholders. Pursuant to the transaction, previously outstanding stock options of Granite Creek have been exchanged for 3,747,500 stock options of Cascadia and warrants to acquire Granite Creek shares have been adjusted to permit their holders to acquire a total of 11,036,291 Cascadia shares, in each case by applying the exchange ratio to the number and exercise prices of such options and warrants.

Board of directors of the combined company

Timothy Johnston, Granite Creek's former president and chief executive officer, has joined Cascadia's board of directors. James Sabala and Kurt Allen have resigned from Cascadia's board of directors. Cascadia would like to thank Mr. Sabala and Mr. Allen for their valuable contributions and wishes them well in their future endeavours.

Subscription receipt financing

Further to the private placement announced in Cascadia's June 9, 2025, news release and closed on July 3, 2025, a total of 14,459,894 subscription receipts have been converted into Cascadia shares and warrants and gross proceeds of $2,024,385 have been released to Cascadia. The Cascadia shares and warrants issued in relation to the subscription receipts are not subject to a resale hold period in Canada. Each warrant will entitle the holder thereof to purchase an additional Cascadia share at a price of 24 cents per share until Aug. 13, 2027.

Cascadia has agreed to pay cash finders' fees totalling $82,223 and issued a total of 587,308 finder warrants to finders comprising Castlewood Capital Corp., Consultant Financier Integritas Inc., Ventum Financial Corp. and BT Global Growth Inc. in connection with the subscription receipt financing. The finders are each at arm's length to Cascadia. Each finder warrant shall be exercisable on the same terms as the warrants. The payment of these finders' fees is subject to receipt of TSX-V approval.

Additional information about the arrangement

Further information regarding the arrangement is set out in the news releases of Cascadia and Granite Creek dated June 9, 2025, and which has been publicly filed by Cascadia and Granite Creek under their respective profiles on SEDAR+ a and the management information circular of Granite Creek dated July 4, 2025, which has been publicly filed under Granite Creek's profile on SEDAR+.

About Cascadia Minerals Ltd.

Cascadia's flagship asset is the Carmacks project in the high-grade Minto copper district in Yukon, Canada. The project is located south of and within 35 kilometres of the past-producing Minto mine, which was recently acquired by Selkirk Copper Mines. The Carmacks project hosts a measured and indicated resource containing 651 million pounds of copper and 302,000 ounces of gold (36.3 million tonnes grading 0.81 per cent copper, 0.26 gram per tonne gold, 3.23 grams per tonne silver and 0.01 per cent molybdenum) with a 2023 PEA (preliminary economic assessment) demonstrating positive economic potential ($230.5-million after-tax net present value (discounted at 5 per cent) and 29-per-cent after-tax internal rate of return).

Cascadia also has a pipeline of discovery-stage copper-gold properties throughout the Yukon Stikine terrane, including its Catch property, which hosts a copper-gold porphyry discovery, where inaugural drill results returned broad intervals of mineralization (116.60 metres of 0.31 per cecnt copper with 0.30 gram per tonne gold). Catch exhibits extensive high-grade copper and gold mineralization across a five-kilometre-long trend, with rock samples returning peak values of 3.88 per cent copper, 1,065 grams per tonne gold and 267 grams per tonne silver.

Quality assurance/quality control

The technical information in this news release has been approved by Andrew Carne, PEng, vice-president, corporate development, for Cascadia and a qualified person for the purposes of National Instrument 43-101.

Prospecting grab samples referenced in this release represent highlight results only and include results from 2024 and previous seasons. Below-detection values for copper, gold and silver have been encountered in grab samples in these target areas. For more details on Catch drilling and prospecting results, please see Cascadia's news releases dated July 25, 2024, and July 19, 2023. The mineral resources and economic analysis disclosed herein are referenced from the 2023 technical report on the Carmacks project PEA, written by SGS Canada Inc. for Granite Creek Copper. Pricing for the Carmacks project PEA base-case economic analysis was $3.75 (U.S.) per pound copper, $1,800 (U.S.) per ounce gold and $22 (U.S.) per ounce silver at an exchange rate of $1 to 75 U.S. cents. The results of the Carmacks PEA are preliminary in nature; the PEA includes inferred mineral resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves; and there is no certainty that the PEA will be realized.

We seek Safe Harbor.