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RIO2 Announces Filing of Prospectus Supplement IN Connection with Previously Announced “Bought Deal” Equity Financing

Financings

1

NOT FOR DISTRIBUTION TO UNITED STATES NEWS WIRE SERVICES OR FOR DISSEMINATION IN THE UNITED STATES

RIO2 ANNOUNCES FILING OF PROSPECTUS SUPPLEMENT IN CONNECTION

WITH PREVIOUSLY ANNOUNCED “BOUGHT DEAL” EQUITY FINANCING

For Immediate Release December 11, 2025

VANCOUVER, BC – Rio2 Limited (“Rio2” or the “Company”) (TSX: RIO; OTCQX: RIOFF; BVL: RIO) today announced

that it has filed a prospectus supplement dated December 10, 2025 (the “Prospectus Supplement”), to its short form

base shelf prospectus dated October 16, 2024, as amended pursuant to amendment no. 1 to such short form base

shelf prospectus dated December 3, 2025 (the “Base Shelf Prospectus”).

The Prospectus Supplement was filed with the securities regulatory authorities in each of the provinces and territories

of Canada, except Quebec , to qualify the public distribution of 74,865,000 subscription receipts (the “ Subscription

Receipts”) at a price of $2.22 per Subscription Receipt in connection with the Company’s previously announced

“bought deal” equity offering (the “Equity Financing”) and acquisition of the Condestable mine (the “Transaction”).

The full particulars of the Equity Financing along with the possible exercise and issue of securities pursuant to the over-

allotment option are set out in the Prospectus Supplement.

The Company has granted the u nderwriters of the Equity Financing an over -allotment option (the “ Over-Allotment

Option”), exercisable in whole or in part, at any time, and from time to time, for a period of 30 days following the closing

of the Equity Financing, to purchase at $2.22 per Subscription Receipt up to such number of additional Subscription

Receipts as is equal to 15% of the number of Subscription Receipts sold pursuant to the Equity Financing. The

underwriters can elect to exercise the Over-Allotment Option to cover over-allotments, if any, and for market stabilization

purposes.

Closing of the Equity Financing is expected to occur on or about December 15, 2025, and is subject to satisfaction of

certain customary closing conditions, includ ing the receipt of all necessary approvals from the the Toronto Stock

Exchange (the “TSX”). The TSX has provided its conditional approval of the listing of the Subscription Receipts and

underlying common shares of Rio2. Listing of such securities will be subject to Rio2 fulfilling all of the listing

requirements of the TSX

The Prospectus Supplement, the Base Shelf Prospectus, and any amendment, as applicable, and a related corporate

presentation are accessible under the Company’s profile on SEDAR+ at www.sedarplus.ca and on the Company’s

website at www.rio2.com.

Acquisition of Condestable Mine

As announced on December 8, 2025, Rio2 has entered into a definitive agreement to acquire a 99.1% interest in the

Condestable mine (“Condestable Mine”) located in Peru (the “Transaction”).

Readers are encouraged to review the Prospectus Supplement, in particular the section entitled “The Acquisition”, for

details regarding the Transaction, including highlights and rationale for the Transaction, and operating and financial

information regarding the Condestable Mine.

In addition, a technical report prepared in accordance with NI 43-101 entitled “ Technical Report on the Condestable

Mine, Lima Department, Peru” dated April 12, 2024, with an effective date of December 31, 2022, has been filed on the

Company’s profile on SEDAR+ and is also available on the Company’s website.

The Company anticipates posting a corporate presentation regarding the Transaction on its website at www.rio2.com

upon closing of the Equity Financing.

This press release shall not constitute an offer to sell or a solicitation of an offer to buy the Common Shares in the

United States. The Common Shares have not been and will not be registered under the United States Securities Act of

1933, as amended (the “U.S. Securities Act”), and may not be offered or sold in the United States absent registration

or an applicable exemption from the registration requirements of the U.S. Securities Act.

About Rio2 Limited

Rio2 is a mining company with a focus on development and mining operations with a team that has proven technical

skills as well as a successful capital markets track record. Rio2 is focused on taking its Fenix Gold Project in Chile to

production in the shortest possible timeframe based on a staged development strategy. Rio2 and its wholly owned

subsidiary, Fenix Gold Limitada, are compa nies with the highest environmental standards and responsibility with the

firm conviction that it is possible to develop mi ning projects that respect the three pillars (Social, Environment,

Economics) of responsible development. As related companies, we reaffirm our commitment to apply environmental

standards beyond those that are mandated by regulators, seeking to protect and preserve the environment of the

territories that we operate in.

To learn more about Rio2 Limited, please visit: www.rio2.com or Rio2's SEDAR+ profile at www.sedarplus.ca.

ON BEHALF OF THE BOARD OF RIO2 LIMITED

Alex Black

Executive Chairman of the Board

Email: [email protected]

Tel: +51 99279 4655

Kathryn Johnson

Executive Vice President, CFO & Corporate Secretary

Email: [email protected]

Tel: +1 604 762 4720

Forward-Looking Information

This news release contains forward-looking statements and forward- looking information (collectively “forward-looking

information”) within the meaning of applicable securities laws relating to the Transaction, the operations of the

Condestable Mine and its potential expansion, expansion of the Fenix Gold Project, and other aspects of Rio2’s future

operations, strategy and plans. Without limiting the generality of the foregoing, this news release contains forward-

looking information pertaining to the following: the completion of the Transaction and the timing thereof; the expected

benefits, synergies and strategic positioning resulting from the Transaction (including diversification, cash flow to

support growth, minimal share dilution, accretion across key per -share metrics, and strong internal rate of return); the

completion of the Equity Financing; the use of proceeds from the Equity Financing; approvals of the TSX with respect

to the Equity Financing, and other matters ancillary or incidental to the foregoing.

All statements included herein, other than statements of historical fact, may be forward-looking information and such

information involves various risks and uncertainties. Forward-looking information is often, but not always, identified by

the use of words such as “seek”, “anticipate”, “plan”, “continue”, “estimate”, “expect”, “may”, “will”, “project”, “predict”,

“potential”, “targeting”, “intend”, “could”, “might”, “should”, “believe” and similar expressions. The forward-looking

information is based on cer tain key expectations and assumptions made by Rio2’s management, including but not

limited to: expectations concerning prevailing commodity prices (including copper and gold prices), exchange rates,

interest rates, applicable royalty rates and tax laws; capital efficiencies; legislative and regulatory environment of Chile

and Peru; future mining and production rates and estimates of capital and operating costs for both the Fenix Gold

Project and Condestable Mine; expectations regarding the availability of debt financing and completion of the Equity

Financing and the Private Placement; estimates of reserves and resources at both properties; anticipated timing and

results of capital expenditures and expansion projects; the sufficiency of capital expenditures i n carrying out planned

activities; results of operations and performance; the successful completion of the Transaction in accordance with the

terms of the Agreement; the availability and cost of financing, labor and services; Rio2’s ability to access capit al on

satisfactory terms; the integration of Condestable operations; the realization of expected synergies and benefits from

the Transaction; the receipt of all regulatory and exchange approvals for the Transaction and the satisfaction of closing

conditions for the Transaction.

Rio2 believes the expectations reflected in these forward-looking statements are reasonable, but no assurance can be

given that these expectations will prove to be correct and such forward-looking statements in this news release should

not be unduly relied upon. A description of assumptions used to develop such forward-looking information and a

description of risk factors that may cause actual results to differ materially from forward -looking information can be

found in Rio2's disclosure documents on the SE DAR+ website at www.sedarplus.ca. These risks and uncertainties

include, but are not limited to: risks and uncertainties relating to the completion of debt and equity financings for the

Transaction; risks relating to the completion of the Transaction, incl uding the satisfaction of closing conditions and

receipt of regulatory approvals; risks associated with the integration of Condestable operations; risks relating to copper

price volatility and market conditions; operational risks at the Condestable Mine; risks associated with mining operations

in Peru; risks relating to the Vendor Debt arrangements and associated security interests; currency fluctuation risks;

regulatory and permitting risks in both Chile and Peru; and management’s ability to anticipate and manage the factors

and risks referred to herein.

Forward-looking statements included in this news release are made as of the date of this news release and such

information should not be relied upon as representing its views as of any date subsequent to the date of this news

release. Rio2 has attempted to identify important factors that could cause actual results, performance or achievements

to vary from those current expectations or estimates expressed or implied by the forward-looking information. However,

there may be other factors that cause results, performance or achievements not to be as expected or estimated, and

that could cause actual results, performance or achievements to differ materially from current expectations. Rio2

disclaims any intention or obligation to update or revise any forward-looki ng statements, whether as a result of new

information, future events or otherwise, except as expressly required by applicable securities legislation.