MOSAIC MINERALS CORPORATION OPTIONS GABOURY Cu-Zn-Au PROPERTY IN TEMISCAMING

Montreal Quebec, May 12, 2021 – The management of Mosaic Minerals Corp. (“Mosaic” or the
“Company”) (CSE: MOC) is very pleased to announce a strategic Option Agreement with Fokus Mining
Corporation (“Fokus”) for an earn-In of up to 80% interest in the Gaboury Project in North-Western
Quebec.

The Gaboury project is composed of 82 mining claim cells totalling 4,282 hectares located
approximately 150 km SW of the Rouyn Noranda mining camp and easily accessible by paved and gravel
roads and 11 km East of former Loraine Mine that produced 600,000 tonnes of ore grading 0.47% Ni
and 1.08% Cu (Source: SIGEOM GM 43679). The Loraine deposit was of magmatic mineralisation of NiCu dominant associated to mafic and ultramafic intrusions.

HISTORICAL EXPLORATION ON THE GABOURY PROPERTY

Nickel Occurrences

In 2010-2011, Fieldex Exploration now Fokus Mining Corp. drilled the Gaboury Property to test an
Electromagnetic Max-min anomaly and that cut significant Nickel grades. The semi-massive
mineralization intersected is located in a calcite matrix within a fracture and silicified gabbro. The best
results are as follow:

Hole* From (m) To (m) Length(m) Ni (%)
GA-10-01 36.80 124.50 87.70 0.20
Incl. 36.80 46.45 9.65 0.28
Incl. 72.82 83.50 10.68 0.28
GA-10-02 117.00 132.00 15.00 0.20
151.29 168.00 16.71 0.20
GA-11-06 190.50 274.50 84.00 0.20
GA-11-08 313.50 394.90 81.40 0.20
Incl. 364.50 379.50 15.00 0.26
*Source: SIGEOM GM 66699

Note: At that time Fieldex Exploration did not test for either Platinum or Palladium.

Copper Occurrences

Also within the Gaboury property is the Pyke copper showing which is located north-east of the nickel
occurrence. Reported Cu results ranging from 0.99% to 12.30% Cu in surface chalcopyrite veins at the contact
with sheared andesitic volcanic rock (Source: SIGEOM GM 39147). Semi-massive mineralization there consists of
chalcopyrite, pyrite and pyrrhotite in a calcite gangue. Limited drilling of some electromagnetic conductors did
not yield significant copper results. Mosaic’s management will reassess this sector shortly to develop a better
understanding of these surface copper occurrences and assess the property’s copper potential.

Gold Occurrences

Within the Gaboury Property the Laverlochère and Brisebois gold occurrences revealed historical gold grades of
up to 445 gAu/t in quartz veins ranging from 0.3 to 5 m thick, while another mineralized shear zone of between
2 to 25 m thick yielded gold grades of up to 8.8 gAu/t. Gold grades of 27.97 gAu/t Au and 9.51 gAu/t over 0.20
m were intersected in the G-18 drill hole on the Brisebois showing, while selected samples revealed grades of
0.71 gAu/t Au and 1.23 gAu/t Au. Copper results were also reported in historical works near these indices. These
historical data are from GM 46167, GM 58164 and GM 04753 and are available on SIGEOM of MERN.

Mr. Morissette, the new President and CEO of Mosaic Minerals commented: “This new acquisition will
allow Mosaic to refocus its business on base metals exploration such as copper, zinc and nickel. These
metals will become increasingly strategic and will become essential for the development of the
electrification of the automotive and motorized industry in the coming years. The prices of copper and
nickel have been rising since beginning of 2020 and there are no indications that the price will decline
in the near term. The timing is perfect for Mosaic to enter those sectors now and begin building a
significant portfolio of base metal opportunities.”

The technical content of this press release has been reviewed and approved by Gilles Laverdière, an
independent consultant and a Qualified Person as defined in NI 43-101.

Financing

For exploration expenditures of the Company projects and for general working capital purposes the
management is evaluating different financing scenarios to raise up to $2M in the upcoming weeks,
however, no decision was made so far.

SIGNIFICANT TERMS AND CONDITION OF THE OPTION AGREEMENT

Pursuant to the May 12, 2021 Earn-in Option Agreement Mosaic may earn up to an 80% interest in the Gaboury
Property in two tranches.

To earn the first 60% interest Mosaic will issue 3,000,000 shares from treasury by May 19, 2021, complete
$150,000 of exploration expenditures within 12 months of the share issue date and complete a further $850,000
within thirty-six months of the share issue date.

To earn an additional 20% interest Mosaic must:

  • a) notify Fokus of its intention to do so by June 30, 2024,
  • b) incur $500,000 of Expenditures per year for the next five years until June 30, 2129.
  • c) complete a NI43-101 Resource Estimate including Indicated Resources.

Mosaic will be the Operator during the earn-in periods. If Mosaic elects to complete the option at the 60% level,
then Fokus shall be the project Operator.

The option agreement is subject to required CSE and TSX approvals.

About Mosaic Minerals Corporation

Mosaic Minerals Corp. is a Canadian mineral exploration company listed on the Canadian Security
Exchange (CSE: MOC) now focusing on the exploration for future strategic Copper-Nickel-Zinc deposits
in priority on the Quebec Province territory which have a long and successful history of base metal
production principally in the Rouyn-Noranda, Matagami, Vald’Or and Chibougamau mining camps.
Exploring for base metal was put on hold a few decades ago to the profit of exploring for gold but the
potential for discovering large Cu, Zn, Ni deposits is still very present.

On Behalf of the Board

M. Guy Morissette
President & CEO
Contact: Guy Morissette at 1-514-531-8129

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.