Orosur Mining increases financing to $18-million

Mr. Louis Castro reports OROSUR MINING INC ANNOUNCES UPSIZE OF BROKERED PRIVATE PLACEMENT UP TO C$20M Orosur Mining Inc., as a result of strong investor demand, has increased the size of its previously announced best efforts private placement from gross proceeds of up to $15-million (Canadian) to gross proceeds of up to $18-million (Canadian). Pursuant to the upsized base offering, the company will sell up to 52,941,177 common shares of the company at a price of 34 Canadian cents (being approximately 0.1809 pound sterling at an exchange rate of 1.88 pounds sterling to $1 (Canadian)) per new common share. Red Cloud Securities Inc. is acting as lead agent and sole bookrunner on behalf of a syndicate of agents, together with U.K. corporate brokers Turner Pope Investments (TPI) Ltd. and with Greenwood Capital Partners Ltd., under the offering. The company has also granted the agents 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 new common shares at the offering price for up to an additional $2-million (Canadian) in gross proceeds. The new common shares issued pursuant to the base offering, together with any new common shares that may be issued pursuant to the agents' option, are referred to as the offer shares. Subject to compliance with applicable regulatory requirements and in accordance with National Instrument 45-106, Prospectus Exemptions, the offer 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. The offer shares issued under the listed issuer financing exemption will not be subject to a hold period under Canadian securities legislation. The offer shares issued under the offering may also be offered for sale to purchasers outside of Canada, including, but not limited to, purchaser's 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 Red Cloud 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 London Stock Exchange. The offering will allow the company to make use of its joint listing on the TSX Venture Exchange 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 company's common shares. There is an amended 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 amended offering document before making an investment decision. The U.K. placing The element of the offering, which 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 entered into a placing agreement with the company on Sept. 17, 2025, 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, agreed to use their respective reasonable endeavours to procure placees in the U.K. for the offer 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 agents, in consultation with the company. Details of the total number of offer shares 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 minerals explorer and developer currently operating in Colombia, Argentina and Nigeria. About the Anza project Anza is a gold exploration project, comprising three exploration licences, a small exploitation permit and a number of exploration licence applications totalling approximately 380 square kilometres in the prolific Mid-Cauca belt of Colombia. The Anza project is currently wholly owned by Orosur via its subsidiaries, Minera Anza S.A. and Minera Monte Aguila S.A.S. The Anza project is located 50 kilometres west of Medellin and is easily accessible by all-weather roads and boasts excellent infrastructure, including water, power, communications and large exploration camp. Admission and total voting rights Application will be made for the offer shares to be admitted to trading on the AIM. It is expected that admission will become effective on or around Oct. 1, 2025. Assuming the issue of up to 58,823,530 offer shares, which, on admission, will rank pari passu with the existing common shares of the company, the total number of common shares in issue with voting rights in the company will be 384,122,424. There are no shares held in treasury. We seek Safe Harbor.