Montero Announces Quotation on Frankfurt Stock Exchange Under the Symbol ES0

Toronto, December 15, 2025 - Montero Mining and Exploration Ltd. (TSXV: MON) (OTC Pink: MXTRF) (FSE: ES0) ("Montero" or the "Company") is pleased to announce that its common shares can now be traded on the Frankfurt Stock Exchange ("FSE") under the symbol ES0, WKN: A417U5 and ISIN: CA6126484022.

With this listing, the Company's common shares are now quoted for trading on the TSX Venture Exchange, OTCPK and the FSE, providing international exposure to Canadian, US and European investors. Being listed and/or quoted for trading on these three Exchanges provides broader access for investors and may also provide additional liquidity for the Company's shareholders. In particular, shareholders in Europe have requested that the Company seek a listing on the Frankfurt Stock Exchange to facilitate improved access and trading liquidity in the region. The Company's FSE stock quote can be found here: https://live.deutsche-boerse.com/equity/montero-mng-expl-1?mic=XFRA.

About Montero

Montero holds 100% interest in the Avispa copper-molybdenum project in northern Chile and has an option to acquire the Elvira and Potrero gold projects in the Maricunga Belt. These projects are currently being advanced through exploration. The Company's board and management have a proven track record in discovery and development of precious and base metal projects.

Montero Mining and Exploration Ltd. is a Canadian exploration company with a focus on mineral development in emerging markets. The Company recently concluded a US$27 million settlement with the Government of Tanzania, bringing closure to the dispute over the expropriated Wigu Hill rare earth project. Approximately $15 million of the settlement proceeds were distributed to shareholders in July 2025.

Montero is listed on the TSX Venture Exchange under the symbol MON and has 8,353,833 Common Shares and 835,383 stock options outstanding.

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

All figures are in Canadian dollars unless otherwise noted.

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION: This news release includes certain "forward-looking information" within the meaning of applicable Canadian securities laws. Generally, forward-looking information can be identified by the use of forward-looking terminology such as "plans", "expects" or "does not expect", "is expected", "budget", "scheduled", "estimates", "forecasts", "intends", "anticipates" or "does not anticipate", or "believes", or variations of such words and phrases or state that certain actions, events or results "may", "could", "would", "might" or "will be taken", "occur" or "be achieved". Such information is based on information currently available to Montero and Montero provides no assurance that actual results will meet management's expectations. Forward-looking information by its very nature involves inherent risks and uncertainties that may cause the actual results, level of activity, performance, or achievements of Montero to be materially different from those expressed or implied by such forward-looking information. Forward looking information in this press release includes, but is not limited to statements with respect to trading on the FSE and that being listed and/or quoted for trading on the three mentioned Exchanges provides broader access for investors and may also provide additional liquidity for the Company's shareholders. Actual results relating to, among other things, the Corporation's deployment of capital, business prospects, strategies, regulatory developments, future commodity prices, exchange rates, satisfactory arrangements for the payment of legal expenses, the ability of the Company to find suitable exploration projects, results of exploration, project development, reclamation and capital costs of Montero's mineral properties, and financial condition and prospects, all of which could differ materially from those currently anticipated in such statements for many reasons such as: changes in general economic conditions and conditions in the financial markets; changes in demand and prices for minerals; litigation, legislative, environmental and other judicial, regulatory, political and competitive developments; technological and operational difficulties encountered in connection with Montero's activities; and other matters discussed in this news release and in filings made with securities regulators. This list is not exhaustive of the factors that may affect any of Montero's forward-looking statements. These and other factors should be considered carefully and accordingly, readers should not place undue reliance on forward-looking information. Montero does not undertake to update any forward-looking information, except in accordance with applicable securities laws.

To view the source version of this press release, please visit https://www.newsfilecorp.com/release/278043