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Monumental Minerals Corp. Announces Reconnaissance Dates FOR the Jemi Heavy Rare Earth Project, Mexico and the Laguna Blanca Cesium-Lithium Brine Project, Chile

Exploration Programs

MONUMENTAL MINERALS CORP. ANNOUNCES RECONNAISSANCE DATES FOR

THE JEMI HEAVY RARE EARTH PROJECT, MEXICO AND THE LAGUNA

BLANCA CESIUM-LITHIUM BRINE PROJECT, CHILE

News Release - Vancouver, British Columbia – March 21, 2022: Monumental Minerals Corp.

(“Monumental” or the “ Company”) (TSX -V: MNRL; FSE: BE5; OTCQB: MNMRF) is pleased to

announce that the Company has will be conducting site visits at the Jemi heavy rare earth (HREE) Project

and the Salar De Laguna Blanca Cesium-Lithium Brine Salar Project (the “Laguna Project”) during the

month of April.

The site visit will f ield-check airborne radiometric and magnetic geophysical features that relate to

peralkaline rocks and associated ore-grade concentrations of REEs in order to determine h igh-priority

drilling targets. The company expects initial data for internal use from this recent survey to be received this

week. Surface rock chip samples will be collected for geochemical and mineralogical testing . While on-

site, th e Company will also coordinate meetings with local communit ies and stakeholders as part of

Monumental’s on-going commitment to ESG.

The Jemi Project hosts numerous rare earth element (REE) occurrences containing potentially economic

concentrations of the high value magnetic REEs including the heavy rare earths (HREEs) dysprosium (Dy)

and terbium (Tb), and the light rare earth elements (LREE) neodymium (Nd), praseodymium (Pr). The

Project also contains associated tantalum (Ta), niobium (Nb), and zirconium (Zr). Jemi sits within the North

American Alkaline Igneous Belt, an under explored north -south trend over 3000 km long of alkaline

igneous rocks and carbonatites that are host to numerous REE, gold and other critical element deposits.

The REE mineralization discovered to date at Jemi exhibits characteristics and mineralogy consistent with

peralkaline intrusion related deposits, which represent an important potentially economic style for the

highest value HREE. Deposits of this type ar e being explored and prepared for development in Australia,

Europe and North America.

Jamil Sader, Monumental’s CEO and Director comments:

“Our site visits in April at both Monumental’s Jemi heavy rare earth project, and the

Laguna Blanca cesium -lithium brine project will allow us to prepare well -planned

exploration programs, including drilling, at both projects. We are excided to get boots-on-

the-ground and to further demonstrate the value that both of these projects have in the

critical metals space”

The Company has entered into an arm’s length letter of intent (“LOI”) with Lithium Chile Inc. (“ Lithium

Chile”) (TSX -V: LITH) to acquire up to 75% of the 5200 -hectare Salar De Laguna Blanca (see

Monumental press release dated March 9, 2022), and a site visit will be undertaken as part of Monumental’s

due diligence process. The site visit will be attended by both Lithium Chile and the Company’s technical

teams to confirm access to site, and to collect representative surface brine and sediment samples for

independent geochemical and mineralogical testing (where applicable) . The mineralogy will help to

establish the mineral phases in the sediments that are hosting both cesium and lithium. The team will also

assess any further surface exploration work required, locations for drilling, and drilling contractors.

The Company plans to meet with Summit Nanotech in Antofagasta, Chile to discuss their direct lithium

extraction (DLE) technology, including pilot plant, and full-scale modular units that could be deployed to

site. Summit is developing 1000 m3/day modular units designed to double yield, reduce climate pollution,

minimize the use of chemicals and freshwater, and reduce waste by 90% compared to traditional

evaporation lithium extraction methods, driving global ESG standards. DLE technology is cur rently in

operation at lithium brine projects in Argentina and China, with several more at the construction and pilot

stage in Argentina and the USA.

The Laguna Project is an early exploration stage project located within the prolific lithium triangle, a zone

within the central Andes high desert that includes Chile, Argentina, and Bolivia. This zone is estimated to

contain more than half of the world’s lithium supply beneath the many salt flats, also known as salars, that

are common to the region. The Laguna Blanca property consists of 23 exploration concessions totaling

5,200 hectares, 100% owned by Lithium Chile through its wholly-owned Chilean subsidiary Minera Kairos

Chile Limitada (“Minera Kairos ”). The Laguna Project is accessible from the town of San Pedro de

Atacama, 80 kilometres to the west via the paved road 27CH to the north end of Salar de Aguas Calientes then

a truck accessible trail heading north to the interior of the property.

Qualified Person

The scientific and technical information contained in this news release has been reviewed and approved

by Kristopher J. Raffle, P.Geo. (BC) Principal and Consultant of APEX Geoscience Ltd. of Edmonton, AB,

a Director of the Company and a “Qualified Person” as defined in National Instrument 43-101 – Standards

of Disclosure for Mineral Projects.

About Monumental Minerals Corp.

Monumental Minerals Corp. is a mineral exploration company focused on the acquisition, exploration, and

development of mine ral resource properties in the critical and electric metals sector. The Company’s

flagship asset is the Jemi HREE project located in Coahuila, Mexico near the Texas, USA border which the

Company has an option to acquire 100% of the 3,650-hectare project. The Company has an option to acquire

a 100% interest and title to the Weyman property located in the Kamloops and Nicola Mining Divisions

and in the Thompson Nicola Regional District, British Columbia.

On behalf of the Board of Directors,

/s/ “Jamil Sader”

Jamil Sader, Chief Executive Officer and Director

Contact Information:

Email: [email protected]

Or

Email: [email protected]

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 news

release.

Forward Looking Information

This news release contains “forward‐looking information or statements” within the meaning of applicable securities

laws, which may include, without limitation, the execution of the Definitive Agreement, obtaining TSX Venture

Exchange approval and completing the proposed transaction with Lithium Chile, potential plans for the Company’s

projects, other statements relating to the technical, financial and business prospects of the Company, its projects and

other matters. All statements in this news release, other than statements of historical facts, that address events or

developments that the Company expects to occur, are forward-looking statements. Although the Company believes

the expectations expressed in such forward-looking statements are based on reasonable assumptions, such statements

are not guarantees of future performance and actual results may differ materially from those in the forward-looking

statements. Such statements are based on numerous assumptions regarding present and future business strategies and

the environment in which the Company will operate in the future, including the price of metals, the ability to achieve

its goals, that general business and economic conditions will not change in a material adverse manner and that

financing will be available if and when needed and on reasonable terms. Such forward -looking information reflects

the Company’s views with respect to future events and is subject to risks, uncertainties and assumptions, including

the risks and uncertainties relating to the interpretation of exploration results, risks related to the inherent uncertainty

of exploration and cost estimates and the potential for unexpected costs and expenses and those other risks filed under

the Company’s profile on SEDAR at www.sedar.com. While such estimates and assumptions are considered

reasonable by the management of the Company, they are inherently subject to significant business, economic,

competitive and regulatory uncertainties and risks . Factors that could cau se actual results to differ materially from

those in forward looking statements include, but are not limited to, continued availability of capital and financing and

general economic, market or business conditions, failure to secure personnel and equipment for work programs ,

adverse weather and climate conditions, risks relating to unanticipated operational difficulties (including failure of

equipment or processes to operate in accordance with specifications or expectations, cost escalation, unavailability of

materials and equipment, government action or delays in the receipt of government approvals, industrial disturbances

or other job action, and unanticipated events related to health, safety and environmental matters) , risks relating to

inaccurate geological assumptions, failure to maintain all necessary government permits, approvals and authorizations,

fluctuation in exchange rates, the impact of Covid-19 or other viruses and diseases on the Company’s ability to operate,

an inability to predict and counteract the effects of COVID -19 on the business of the Company, including but not

limited to, the effects of COVID-19 on the price of commodities, capital market conditions, restriction on labour and

international travel and supply chains, decrease in the price of rare earth elements, lithium, cesium and other metals,

loss of key employees, consultants, or directors, failure to maintain community acceptance, increase in costs, litigation,

and failure of counterparties to perform their contractual obligat ions. The Company does not undertake to update

forward‐looking statements or forward‐looking information, except as required by law.