Alta Copper Commences Trading as “ATCUF” on the OTCQX® Best Market

VANCOUVER, July 05, 2023 - Alta Copper Corp. (TSX: ATCU; OTCQX: ATCUF; BVL: ATCU) ("Alta Copper" or the "Company") announces that effective July 3, 2023 the Company has been upgraded from the OTCQB Venture Market to the OTCQX Best Market.

Alta Copper began trading on Monday, July 3, 2023 on OTCQX Best Market under the symbol "ATCUF". U.S. investors can find current financial disclosure and Real-Time Level 2 quotes for the Company on www.otcmarkets.com.

The OTCQX Best Market is designed for established, investor-focused U.S. and international companies. To qualify for OTCQX, companies must meet high financial standards, follow best practice corporate governance, and demonstrate compliance with applicable securities laws.

"Graduating to the OTCQX Best Market marks yet another milestone for the Company as we advance as an emerging copper developer advancing with the global shift toward electrification and decarbonization while also further enhancing our visibility among US and International investors," commented Giulio T. Bonifacio, Executive Chair of Alta Copper.

About OTC Markets Group Inc.

OTC Markets Group Inc. (OTCQX: OTCM) operates regulated markets for trading 12,000 U.S. and international securities. Our data-driven disclosure standards form the foundation of our three public markets: OTCQX^® Best Market, OTCQB^® Venture Market and Pink^® Open Market.

Our OTC Link^® Alternative Trading Systems (ATSs) provide critical market infrastructure that broker-dealers rely on to facilitate trading. Our innovative model offers companies more efficient access to the U.S. financial markets.

OTC Link ATS, OTC Link ECN and OTC Link NQB are each an SEC regulated ATS, operated by OTC Link LLC, a FINRA and SEC registered broker-dealer, member SIPC.

To learn more about how we create better informed and more efficient markets, visit www.otcmarkets.com.

Media Contact:
OTC Markets Group Inc., +1 (212) 896-4428, media@otcmarkets.com

About Alta Copper

Alta Copper is focused on the development of its 100% owned Cañariaco advanced staged copper project. Cañariaco comprises 97 square kilometers of highly prospective land located 150 kilometers northeast of the City of Chiclayo, Peru, which include the Cañariaco Norte deposit, Cañariaco Sur deposit and Quebrada Verde prospect, all within a 4km NE-SW trend in northern Peru's prolific mining district. Cañariaco is one of the largest copper deposits in the Americas not held by a major.

Cautionary Note Regarding Forward Looking Statements

This press release contains forward-looking information within the meaning of Canadian securities laws ("forward-looking statements"). Forward-looking statements are typically identified by words such as: believe, expect, anticipate, intend, estimate, plans, postulate and similar expressions, or are those, which, by their nature, refer to future events. All statements that are not statements of historical fact are forward-looking statements, including, but not limited to, statements with respect to the effective date of the consolidation and name change of the Company. These forward-looking statements are made as of the date of this press release. Although the Company believes the forward-looking statements in this press release are reasonable, it can give no assurance that the expectations and assumptions in such statements will prove to be correct. The Company cautions investors that any forward-looking statements by the Company are not guarantees of future results or performance, and are subject to risks, uncertainties, assumptions and other factors which could cause events or outcomes to differ materially from those expressed or implied by such forward-looking statements. There can be no assurance that forward-looking statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements. We are under no obligation to update or alter any forward-looking statements except as required under applicable securities laws.

On behalf of the Board of Alta Copper Corp.

"Joanne C. Freeze" P.Geo., President, CEO and Director

For further information please contact:

Joanne C. Freeze, President, CEO and Director
jfreeze@altacopper.com
+1 604 512 3359

or

Giulio T. Bonifacio, Executive Chair and Director
gtbonifacio@altacopper.com
+1 604 318 6760