Atico Mining Corporation — AGM Information 2021

Apr 1, 2021

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Via SEDAR

April 1, 2021

British Columbia Securities Commission Alberta Securities Commission Ontario Securities Commission Saskatchewan Securities Commission Manitoba Securities Commission TSX Venture Exchange

Dear Sir or Madam:

Re: Atico Mining Corporation (the “Company”) Advance Notice of Annual General Meeting

We advise the following with respect to the upcoming Annual General Meeting of Shareholders of the Company:

1. Meeting Type: 2. Class of Securities Entitled to Receive Notice: 3. Class of Securities Entitled to Vote: 4. CUSIP Number: 5. Record Date for Notice:

2. Record Date for Voting: 7. Beneficial Ownership Determination Date: 8. Meeting Date: 9. Meeting Location: 10. Notice & Access Will Be Utilized: • Beneficial Holders • Registered Holders

3. Stratification 12. Sending proxy materials directly to NOBOs: 13. Pay for proxy materials to be delivered to OBOs:

Annual Common Common 047559 April 27, 2021 April 27, 2021 April 27, 2021 June 15, 2021 Virtual Meeting

Yes Yes No Yes No

Yours truly,

ATICO MINING CORPORATION

Signed: “Kim Casswell”

Kim Casswell CORPORATE SECRETARY

Atico Mining Corporation Suite 501 – 543 Granville Street, Vancouver BC, Canada V6C 1X8 T +1 (604) 633-9022 F +1 (604) 688-1157 www.aticomining.com