Mountain Province Diamonds Amends Terms of Working Capital Facility

Press Release

TORONTO and NEW YORK, Nov. 18, 2025– Mountain Province Diamonds Inc. (“Mountain Province” or the “Company”) (TSX: MPVD) (OTC: MPVD) announces today that the Company has entered into an amending agreement (the “Amending Agreement”) with Dunebridge Worldwide Ltd. as administrative agent, security trustee and lender (“Dunebridge”), a related party of the Company amending certain terms of its working capital facility in the amount of CAD33,000,000 (the “WCF”).

Pursuant to the Amending Agreement (i) the period during which the Company may make advances against the WCF is extended from November 13, 2025 to March 31, 2026; (ii) the implementation of certain repayment mechanics involving the direct payment to Dunebridge of the proceeds of the Company’s diamond proceeds while the WCF is outstanding, is deferred until February 28, 2026; and (iii) the date for repayment of the principal amount of the WCF is extended from December 31, 2025 to March 31, 2026.

Mark Wall, the Company’s President and Chief Executive Officer, commented:

“The amendments to the WCF allow the Company access to additional funds in this crucial period before its working capital is expected to improve once it starts to realize on the sales of the higher grade material from its NEX ore body”. It almost goes without saying, that we are grateful for the continued support of Dunebridge.”.

Review and Approval Process

The Proposed WCF was considered by the same special committee (the “Special Committee”) of independent directors of the Company (the “Board”) created to consider the WCF and other previously announced refinancing transactions. The Special Committee reviewed the Amending Agreement and, owing in material part to the financial condition of the Company and various other factors, recommended that the Board approve the Amending Agreement.

The Board received the recommendations and findings of the Special Committee and unanimously approved the Amending Agreement. Two members of the Board, Mr. Jonathan Comerford and Mr. Brett Desmond, having declared conflicts of interest, abstained from voting on the Amending Agreement.

Multilateral Instrument 61-101 – Protection of Minority Security Holders in Special Transactions – Exemption for Financial Difficulty

Vertigol Unlimited Company (“Vertigol”) is the beneficial holder of 75,446,071 shares of the Company, which represents over 35% of the Company’s issued and outstanding shares. Mr. Dermot Desmond (“(Mr. Desmond”) is the ultimate beneficial owner of Vertigol and accordingly, both Vertigol and Mr. Desmond¹ are a “related party” (as defined in Multilateral Instrument 61-101 – Protection of Minority Security Holders in Special Transactions (“MI 61-101”)). Dunebridge, is also ultimately beneficially owned by Mr. Desmond, which makes Dunebridge an affiliate of Vertigol, and a related party of the Company under MI 61-101. The Amending Agreement does not affect the shareholdings of any of Vertigol, Mr. Dermot Desmond or Dunebridge.

The execution and delivery of the Amending Agreement constitutes a “related party transaction” within the meaning of MI 61-101.

The Company is relying on the exemption from the formal valuation and minority shareholder approval requirements applicable to a related party transaction provided under section 5.5(g) and 5.7(1)(e) of MI 61-101 on the grounds that the Company is in serious financial difficulty, that the Amending Agreement is designed to improve the financial position of the Company and that the Board, acting in good faith, and all of the Company’s independent directors, acting in good faith determined that, the terms of the Amending Agreement are reasonable given the difficulties that the Company is facing.

About Mountain Province Diamonds Inc.

Mountain Province is a 49% participant with De Beers in the Gahcho Kué mine located in Canada’s Northwest Territories. The Gahcho Kué joint venture property consists of several kimberlites that are actively being mined, developed, and explored for future development. The Company also controls more than 96,000 hectares of highly prospective mineral claims and leases surrounding the Gahcho Kué mine that include an indicated mineral resource for the Kelvin kimberlite and inferred mineral resources for the Faraday kimberlites.

For further information on Mountain Province and to receive news releases by email, visit the Company’s website at www.mountainprovince.com.

FOR FURTHER INFORMATION, PLEASE CONTACT:

Mark Wall, President and CEO
151 Yonge Street, Suite 1100
Toronto, Ontario M5C 2W7 Phone: (416) 361-3562
E-mail: info@mountainprovince.com

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