Notice of AGM of Shareholders to be held on June 14, 2023

• April 27, 2023

Meeting Materials Downloads

NOTICE IS HEREBY GIVEN THAT AN ANNU AL GEN E RAL MEETING (the “ Meeting “) of ho lders (“ Shareholders “) of common shares (“ Common Shares “) of Mongoose Mining Ltd. (the “ Company “) will be held via li v e webcast at 12 :0 0 noon ( Toronto time ), on Wednesday , June 14, 2023 for the following purposes:

• to receive and consider the audited financ ial s t atements of the Company for the year ended December 31, 2022 and the report of the auditor thereon;

• to fix t he number o f directors of the Company to be elected at the Meeting at seven;

• to elect directors to hold office until the next annual general m eetin g of the Company;

• to appoint the auditor of the Company for the ensuing year and to authorize the board of di rectors of th e Company to fix the auditor’s remuneration ; and

• to tr ansact such other business as may be properly brought before the Meeting or any a djournment thereof.

The board of directors of the Company has fixed the record date for the Meeting at the close of bus in ess on Friday, April 28, 2023 (the “ Record Date “). Only Sh areholders of record as at the Record Date are entitled to receive noti ce of the Meeting. Shareholders of record will be entitled to vote those Common Shares owned as at the Record Date, unless an y such Shareholder transfers such Shareholder’s Common Share s after the Record Date and the transferee of those Common Shares estab lishe s that the transferee owns the Common Shares and demands, not later than 10 days before the Meeting, that the transferee ‘s name be included in the list of Shareholders entitled to vote at the Meeting, in which case such transferee shall be entitled to vote such Common Shares at the Meeting.

ATTENDING THE MEETING

The Meeting will be conducted solely online via live webcast to provide a widely accessible experience for S hareholders .

In order t o a t t end t he M e e t ing virtu a lly, share h o lders are required t o l og in t o Web Link: http://momentum.adobeconnect.com/mongoosemininga gm/ a t l ea s t fif t een ( 15 ) minu t es prior to t he start of t h e M e e t in g . You may also log on to the Meeting by dia ling 416 – 764 – 8 6 58 or T oll – F ree in North America 1 – 888 – 88 6 – 7786 .

N O VOTES W ILL BE ACCEPTED AT THE MEETING.

DATED this 27th day of April, 2023.

B Y ORDER OF THE BOARD OF DIRECTORS

(signed) Matthew Allas, Chairman