Margaret Lake Announces NAME Change to Vault Strategic Mining Corp. and New Ticker Symbol of "KNOX"

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MARGARET LAKE ANNOUNCES NAME CHANGE TO VAULT STRATEGIC

MINING CORP. AND NEW TICKER SYMBOL OF "KNOX"

Vancouver, British Columbia – December 15, 2025 - Margaret Lake Diamonds Inc. (TSXV:DIA)

(OTC:DDIAF) (FSE:M85) ("DIA" or the "Company") announces that it will change its name to Vault

Strategic Mining Corp. and trade under the new ticker symbol "KNOX" on the TSX Venture Exchange (the

"TSXV").

The Company's common shares are expected to commence trading on the TSXV under the new name and

new ticker symbol "KNOX" at the start of trading on or about December 17, 2025. In connection with the

name change, the new CUSIP number for the common shares will be 92243U107 and the new ISIN number

will be CA92243U1075.

No action is required to be taken by existing shareholders and warrantholders with respect to the name

change. Certificates representing common shares or warrants exercisable for common shares of the

Company will not be affected by the name change and wil l not need to be exchanged. The Company

encourages any shareholder with any questions or concerns to discuss any of the foregoing with their broker

or agent.

On behalf of the Board:

Margaret Lake Diamonds Inc.

"R. Nick Horsley"

President, Chief Executive Officer, Chairman

Tel: 604.880.2189 | Email: [email protected]

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in policies of

the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

Disclaimer for Forward-Looking Information

This release includes forward-looking statements regarding DIA, and the Letain Project, which may include, but is not limited to,

statements with respect to the completion of the acquisition of the Letain Project, and the ability to obtain regulatory approvals,

and other factors. Often, but not always, Forward -looking statements can be identified by the use of words such as "plans", "is

expected", "expects", "scheduled", "intends", "contemplates", "anticipates", "believes", "proposes", "estimates" or v ariations 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 statements are based on the current expectations of the management of each entity. The for ward-looking

events and circumstances discussed in this release, including completion of the acquisition of the Letain Project, may not occur by

certain specified dates or at all and could differ materially as a result of known and unknown risk factors and uncertainties affecting

the Company, including the risk that DIA may not obtain all requisite approvals for the acquisition, including the approval of the

TSXV, risks of the resource industry, failure to obtain any other required regulatory approvals, economic factors, any estimated

amounts, timing of the acquisition and requited payments , the equity markets generally and risks associated with growth,

exploration and development. Although DIA has attempted to identify important factors that could cause actual actions, events or

results to differ materially from those described in forward-looking statements, there may be other factors that cause actions, events

or results to differ from those antici pated, estimated or intended. No forward -looking statement can be guaranteed. Except as

required by applicable securities laws, forward -looking statements speak only as of the date on which they are made DIA

undertaked no obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future

events, or otherwise.