Alta Copper Corp. and Nascent Exploration Pty Ltd Announce Completion of Plan of Arrangement

VANCOUVER, BC / ACCESS Newswire / March 9, 2026 / Alta Copper Corp. (TSX:ATCU)(OTCQX:ATCUF)(BVL:ATCU) ("Alta Copper") and Nascent Exploration Pty Ltd are pleased to announce the successful completion of the previously announced plan of arrangement under Division 5 of Part 9 of the Business Corporations Act (British Columbia) (the "Arrangement").

Pursuant to the Arrangement, Nascent Exploration Pty Ltd ("Nascent"), a wholly-owned subsidiary of Fortescue Ltd ("Fortescue"), acquired all of the issued and outstanding common shares of Alta Copper (the "Alta Copper Shares") not already held by Nascent and in exchange holders of the Alta Copper Shares ("Alta Copper Shareholders") received C$1.40 in cash per Alta Copper Share , the holders (the "Optionholders") of options to purchase Alta Copper Shares (the "Alta Copper Options") received C$1.40 less the applicable exercise price, per underlying share, for Alta Copper Options held and holders of the deferred share units of Alta Copper (the "Alta Copper DSUs") and restricted share units of Alta Copper (the "Alta Copper RSUs") received C$1.40 per underlying share, for the Alta Copper DSUs and the Alta Copper RSUs, held immediately prior to the effective time of the Arrangement (the "Consideration"). The implied equity value of the Arrangement is approximately C$139 million.

As a result of the completion of the Arrangement, the Alta Copper Shares are expected to be delisted from the Toronto Stock Exchange on or about March 10, 2026 (the "Delisting"). The Alta Copper Shares will correspondingly be withdrawn from the Bolsa de Valores de Lima ("BVL") exchange and the OTC Markets Group ("OTCQX") trading platform. In connection with the Delisting, Alta Copper will also submit an application to the applicable securities regulators to cease to be a reporting issuer and to terminate its public reporting obligations in Canada. Further details regarding the Arrangement are set out in Alta Copper's management information circular dated December 19, 2025, (the "Circular") a copy of which is available under Alta Copper's issuer profile on SEDAR+ at www.sedarplus.ca.

Alta Copper Shareholders are reminded to review the Circular in respect of the procedure for receiving the Consideration for their Alta Copper Shares. Registered shareholders (Alta Copper Shares held in physical form or a direct registration system ("DRS") advice) must complete, sign and return the letter of transmittal, along with their share certificate(s) or DRS advice(s), to TSX Trust Company, the depositary for the Arrangement. Non-registered shareholders (Alta Copper Shares held with a broker, bank or other intermediary) should contact their intermediaries for instructions and assistance in receiving the Consideration for such Alta Copper Shares. The letter of transmittal is available at https://altacopper.com/investors/shareholders-meetings/ or under Alta Copper's profile on SEDAR+ (www.sedarplus.ca).