Mr. Louis Castro reports

OROSUR MINING INC ANNOUNCES PRIVATE PLACEMENT FOR GROSS PROCEEDS UP TO C$17M

Orosur Mining Inc. has entered into an agreement with Red Cloud Securities Inc., to act as lead agent and bookrunner, on behalf of a syndicate of agents, together with U.K. corporate brokers Turner Pope Investments (TPI) Ltd. and Greenwood Capital Partners Ltd., in connection with a best efforts private placement for gross proceeds of up to $15-million from the sale of up to 44,117,647 common shares of the company at a price of 34 cents (being approximately 0.1809 pound sterling based on a current exchange rate for pound sterling to Canadian dollar of 1.88) per new common share.

The company has also granted the agent the option, exercisable in full or in part, up to 48 hours prior to the closing date, to sell up to an additional 5,882,353 common shares at the offering price for up to an additional $2-million in gross proceeds.

Subject to compliance with applicable regulatory requirements and in accordance with National Instrument 45-106, Prospectus Exemptions, the New common shares that may be sold in Canada under the offering will be offered for sale to purchasers in all the provinces of Canada, except for Quebec, pursuant to the listed issuer financing exemption under Part 5A of NI 45-106, as amended by Coordinated Blanket Order 45-935, Exemptions from Certain Conditions of the Listed Issuer Financing Exemption. New common shares issued under the listed issuer financing exemption will not be subject to a hold period under Canadian securities legislation. New common shares issued under the offering may also be offered for sale to purchasers outside of Canada, including, but not limited to, purchasers resident in the United States, pursuant to one or more exemptions from registration requirements of the United States Securities Act of 1933, as amended.

The company intends to use the net proceeds of the offering principally to advance the company's Anza exploration project in Colombia, as well as for general working capital and corporate purposes.

The offering is scheduled to close on or around Sept. 30, 2025, or such other date as the company and the agent may agree (being no later than Oct. 17, 2025), and is subject to certain conditions, including, but not limited to, receipt of all necessary approvals, including the approval of the TSX Venture Exchange and admission to the Alternative Investment Market of the London Stock Exchange.

The offering will allow the company to make use of its joint listing on the TSX-V and AIM to broaden its shareholder base, including institutional investors in Canada, the United Kingdom and certain other foreign jurisdictions, and is expected to improve the liquidity of the common shares.

There is an offering document related to the offering in Canada that can be accessed under the company's profile on SEDAR+ and on the company's website. Prospective investors in Canada should read the offering document before making an investment decision.

The U.K. placing

The element of the offering that shall be undertaken by the U.K. brokers in the U.K. shall be carried out by way of a placing to institutional and other eligible investors. The company and the U.K. brokers today entered into a placing agreement with the company, under which, on the terms and subject to the conditions set out in the placing agreement, the U.K. brokers, as agents for and on behalf of the company, have agreed to use their respective reasonable endeavours to procure placees in the U.K. for the new common shares at the offering price. The placing is not being underwritten by the U.K. brokers or any other person.

The timing of the closing of the book and allocations are at the discretion of the U.K. brokers and the agent, in consultation with the company. Details of the total number of new common shares, together with any new common shares that may be issued pursuant to the agent's option, will be announced as soon as practicable after the close of the offering via the result of placing announcement.

About Orosur Mining Inc.

Orosur Mining is a mineral explorer and developer currently operating in Colombia, Argentina and Nigeria.

We seek Safe Harbor.