Montreal, Quebec – April 7, 2021 – M. Maurice Giroux, President and CEO of Mosaic Minerals Corp. (“Mosaic”
or the “Company”) (CSE: MOC) is very pleased to announce effective immediately the appointments of M. Luc
Gervais and Éric Beauchêne to the board of Directors of Mosaic.

Luc Gervais holds a mining engineering degree from Laval University and is a member of the Ordre des Ingénieurs
du Québec (OIQ). M. Gervais has 35 years of experience in engineering, construction and maintenance in the
mining and metallurgy sectors and has held several management positions in metallurgy departments for
different producers. He has led studies for numerous mining companies and worked on various projects in
Canada and abroad. In addition, he currently sits on the board of Vanstar Mining Ressources, a Quebec-based
junior exploration company.

Eric Beauchesne holds a Master in Business Administration (MBA) with a mining specialization. He is currently
the CEO of Arkys Web Software, specialized in the mining industry. M. Beauchsne has a solid experience with
junior mining companies and has acted as a director and member of the audit committee of Vanstar Mining
Resources Inc. from 2015 to 2020. He is also a director and a shareholder of Geotic, a company specializing in
the development of geology software for well-known exploration and mining companies in the industry. He
played an active role in the management committee and in the development of Geotic’s business. Mr.
Beauchesne is a director and shareholder of TMR Communications, a specialized marketing communications firm
whose main client base is mining.

Concurrently Mosaic announces the resignation of M. Éric Allard as a Board member. We wish to thank M. Allard
for his contribution to Mosaic development and we wish him the best of luck in his other ongoing project.

Maurice Giroux, President and CEO quoted: “Even though the departure of Éric Allard saddens us, we are very
pleased to welcome Luc Gervais et Éric Beauchesne on the board. Their long experience in the industry as well
as in the Junior Exploration space certainly strengthens the board of Mosaic Minerals.”

About Mosaic Minerals Corporation

Mosaic Minerals Corp., founded in 2018, is a Canadian mineral exploration company focused on the
acquisition and the development of mining property with potential principally within the Quebec
mining camps.

On Behalf of the Board
Maurice Giroux BSc
President & CEO
Contact: Maurice Giroux at 1-514-952-5709

This release contains certain “forward-looking information” under applicable Canadian securities laws concerning the Arrangement. Forward-looking
information reflects the Company’s current internal expectations or beliefs and is based on information currently available to the Company. In some cases
forward-looking information can be identified by terminology such as “may”, “will”, “should”, “expect”, “intend”, “plan”, “anticipate”, “believe”, “estimate”,
“projects”, “potential”, “scheduled”, “forecast”, “budget” or the negative of those terms or other comparable terminology. Assumptions upon which such
forward-looking information is based includes, among others, that the conditions to closing of the Arrangement will be satisfied and that the Arrangement
will be completed on the terms set out in the definitive agreement. Many of these assumptions are based on factors and events that are not within the
control of the Company, and there is no assurance they will prove to be correct or accurate. Risk factors that could cause actual results to differ materially
from those predicted herein include, without limitation: that the remaining conditions to the Arrangement will not be satisfied; that the business prospects
and opportunities of the Company will not proceed as anticipated; changes in the global prices for gold or certain other commodities (such as diesel,
aluminum and electricity); changes in U.S. dollar and other currency exchange rates, interest rates or gold lease rates; risks arising from holding derivative
instruments; the level of liquidity and capital resources; access to capital markets, financing and interest rates; mining tax regimes; ability to successfully
integrate acquired assets; legislative, political or economic developments in the jurisdictions in which the Company carries on business; operating or technical
difficulties in connection with mining or development activities; laws and regulations governing the protection of the environment; employee relations;
availability and increasing costs associated with mining inputs and labour; the speculative nature of exploration and development; contests over title to
properties, particularly title to undeveloped properties; and the risks involved in the exploration, development and mining business. Risks and unknowns
inherent in all projects include the inaccuracy of estimated reserves and resources, metallurgical recoveries, capital and operating costs of such projects,
and the future prices for the relevant minerals.
Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts
responsibility for the adequacy or accuracy of this release.