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MONUMENTAL MINERALS ANNOUNCES MAIDEN DRILLING PROGRAM AT THE JEMI HEAVY RARE EARTH ELEMENT PROJECT, MEXICO Core drilling to commence the first week of July 2023

Exploration Programs

MONUMENTAL MINERALS ANNOUNCES

MAIDEN DRILLING PROGRAM AT THE JEMI

HEAVY RARE EARTH ELEMENT PROJECT,

MEXICO

Core drilling to commence the first week of

July 2023

VANCOUVER, BC

,

June 20, 2023

/CNW/ - Monumental Minerals Corp. ("

Monumental

" or the

"

Company

") (TSXV: MNRL) (FSE: BE5) (OTCQB: MNMRF) is pleased to announce a maiden

drilling program project at the Jemi rare earth element (REE) project (the "

Project

") in

Coahuila,

Mexico

, about 40 km south of the

Texas, USA

border. Rock sampling across a broad area

discovered high grades of heavy rare earth elements (HREEs) dysprosium (Dy) and terbium (Tb),

and light rare earth elements (LREEs) neodymium (Nd) and Praseodymium (Pr), all critical to

permanent magnets for EVs. Additionally, samples contain high concentrations of niobium (Nb) and

tantalum (Ta). The exploration work resulted in the definition of 6 high priority drill targets.

An extensive surficial exploration program was completed at Jemi, with the aim of defining discreet

drill targets. Exploration focused on the Jemi Dykes and Veladora North prospect areas within

Monumental's claims, which host peralkaline intrusion-related REE mineralization. The work

consisted of detailed geological mapping, regional stream sediment sampling, ground radiometric

geophysical surveys, and lithogeochemical sampling (see Company's news release dated

April 4,

2023

). Based on that exploration work, Monumental has planned an initial drill program consisting of

1800 m

over 6 drill holes, targeting high priority targets. All permits, land access agreements and

drilling contracts have been obtained and the drilling program will commence the first week of July,

2023. It is expected to take approximately 60 to 90 days to complete, and assay results are

expected within 6 weeks of sample submission to a commercial laboratory.

Dr.

Jamil Sader

, CEO and Director comments:

"We are excited to initiate our maiden drill program at our Jemi Project. We have de-risked

this Project from both ESG and technical aspects, and our next step is to confirm our

geological models through drilling. The 6 high-value targets selected have minerals and

geochemistry with similar characteristics to other well defined hardrock peralkaline REE

systems globally and we are optimistic that drilling will further define a REE mineralized

system below the surface at Jemi. With two recent strategic financings, we are fully funded

to complete this program."

The goal of the drill program is to define and delineate the source of REE-mineralized (eudialyte +/-

aegirine rich) intrusive dykes and sills. Dysprosium oxide (Dy

2

O

3

) and terbium oxide (Tb

2

O

3

) in

surface samples within the priority areas that are classified as peralkaline (92 samples) range

between 959 ppm and 4 ppm; and 147 ppm and 0.7 ppm, respectively. The average concentration

for Dy

2

O

3

is 110 ppm; and the average for Tb

2

O

3

is 17 ppm. The magnetic light rare earth oxides,

namely neodymium oxide (Nd

2

O

3

) and praseodymium oxide (Pr

2

O

3

), ranged between 3173 ppm

and 30 ppm; and 824 ppm and 8 ppm, respectively. The average concentration for Nd

2

O

3

is 467

ppm; and for Pr

2

O

3

it is 132 ppm. These values are in trend with HREO

2

concentrations and the

ratio of HREO

2

to LREO

3

is consistently on average 1:2, suggesting similar REE-hosting phases

across the project.

In addition to being REE-mineralized, the surface samples are also enriched with respect to tantalum

(Ta) and niobium (Nb). Assays for these critical elements in all samples from the Jemi project

returned values to 976 ppm Ta

2

O

5

and greater than (>) 3576 ppm Nb

2

O

5

, with an average

concentration of Ta

2

O

5

of 114 ppm and Nb

2

O

5

of 1114 ppm.

Upcoming Conferences

Monumental Minerals will be attending the "Lithium Supply and Raw Battery Materials" conference in

Las Vegas

from

June 19-22, 2023

and the "Lithium Latin America" conference in

Buenos Aires

on

July 5-6, 2023

. We will be meeting with a number of direct lithium extraction (DLE) technology

companies as well as producers, investment funds and suppliers in order to bring more awareness

and potential future partnerships on our projects.

Rare Earth Element Value and the Global Energy Transition

Because of their unusual physical and chemical properties, REEs have diverse energy, industrial,

and military technology applications. It is projected that rare earth magnets will maintain dominant

market share, powering EVs as well as other types of electric motors (e.g., wind turbines, water

pumps) this decade, as there is minimal to no substitution risk. Significant demand growth is

therefore expected, and the already tight market and elevated price levels for key magnet rare

earths (Nd, Pr, Dy, and Tb) is likely to continue

4

. The strongest magnets are neodymium-iron-boron

(NdFeB) are and are used when space and weight are restrictions are present. The addition of

terbium and dysprosium to NdFeB magnets can double their optimal operating temperature from

80°C to 160°C. In addition, dysprosium with praseodymium increases a magnet's coercivity (the

resistance of a magnetic material to change in magnetisation).

The four key REEs (Nd, Pr, Dy, Tb) represent 94% of the REE market by value, all of which are

enriched at Jemi. Concentrations of Nb and Ta are also enriched and could potentially be

economically significant.

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

. Mr. Raffle verified the data

disclosed which includes a review of the sampling, analytical and test data underlying the information

and opinions contained therein.

About Monumental Minerals Corp.

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

and development of mineral 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 75% interest and title to the Laguna cesium-lithium brine project

located in

Chile

and a 50.01% interest in the Salar De Turi lithium project in

Chile

.

On behalf of the Board of Directors,

/s/ "Jamil Sader"

Jamil Sader

,

Chief Executive Officer and Director

1

Total Rare Earth Oxides (TREO) includes: La

2

O

3

, Ce

2

O

3

, Pr

2

O

3

, Nd

2

O

3

, Sm

2

O

3

, Eu

2

O

3

, Gd

2

O

3

, Tb

2

O

3

, Dy

2

O

3

, Ho

2

O

3

, Er

2

O

3

, Tm

2

O

3

, Yb

2

O

3

, Lu

2

O

3

, Y

2

O

3

.

2

Heavy Rare Earth Oxides (HREO) includes: Eu

2

O

3

, Gd

2

O

3

, Tb

2

O

3

, Dy

2

O

3

, Ho

2

O

3

, Er

2

O

3

, Tm

2

O

3

, Yb

2

O

3

, Lu

2

O

3

, Y

2

O

3

,

3

Light Rare Earth Oxides (LREO) includes La

2

O

3

, Ce

2

O

3

, Pr

2

O

3

, Nd

2

O

3

, Sm

2

O

3

.

4

BMO Capital Markets, Into the Abyss: A Supply-Chain Deep Dive from Rare Earth to Permanent Magnets, May 31, 2022.

Contact Information:

Email:

[email protected]

Or

Max Sali

,

VP Corporate Development and Director

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 potential plans for the

Company's projects, the expected timing and completion of potential drilling at Jemi and the receipt

of assays, potential outcomes and results of the drill program, 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 cause

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, failure to obtain

surface access agreements or understandings from local communities, land owners or Indigenous

groups, 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 (including from the

Indigenous communities), increase in costs, litigation, and failure of counterparties to perform their

contractual obligations. The Company does not undertake to update forward–looking statements or

forward–looking information, except as required by law.

SOURCE

Monumental Minerals Corp.

View original content to download multimedia:

http://www.newswire.ca/en/releases/archive/June2023/20/c4138.html

%SEDAR: 00050941E

CO: Monumental Minerals Corp.

CNW 08:00e 20-JUN-23