Halifax, Nova Scotia – September 3, 2025 – Mongoose Mining Ltd. (“Mongoose” or the “Company”) (CSE:MNG) is pleased to announce that it has been awarded a $100,000 shared funding grant through the Nova Scotia Mineral Resources Development Fund (NSMRDF). The Company would like to thank the Government of Nova Scotia for this support, which is awarded based on the geological significance of projects and their potential to advance exploration targets in the province.

Advancing a Promising IOCG Target

The Mount Thom Property, located along the Cobequid-Chedabucto Fault Zone (CCFZ), is recognized as a highly
prospective setting for Iron Oxide Copper-Gold (IOCG) mineralization. In 2022, Mongoose (through its predecessor
Spark Minerals Inc.) commissioned CSR GeoSurveys Ltd. of Porters Lake, N.S., to conduct the first property-wide
ground gravity survey over Mount Thom.
The survey was designed with the exploration philosophy established by Minotaur Exploration in Australia, a global
leader in IOCG exploration, which emphasized that any significant IOCG target must be expressed as a pronounced
positive gravity anomaly.
Using modern inversion processing techniques, CSR GeoSurveys identified a well-developed, roughly circular gravity
anomaly measuring approximately 2 km east-west by 1.5 km north-south in the central core of the property. A
secondary, oval-shaped gravity anomaly measuring roughly 800 m by 400 m was also delineated to the southeast.
These anomalies represent high-priority drill targets, imaging density contrasts likely associated with faults,
intrusions, and dense Fe-rich mineralized zones at depths ranging from 50 m to 1.4 km.
This is especially significant as nearly all historic drilling at Mount Thom tested only shallow depths of 50 m, while
the new gravity data points to much larger, deeper-seated targets. Building on this foundation, Mongoose plans to
complete a 1,200-metre diamond drill program (two holes) designed to test the anomaly and target copper, cobalt,
and gold. Both copper and cobalt are classified as critical minerals under Canada’s Critical Minerals Strategy, key to
electrification, renewable energy, and secure supply chains, adding strategic importance to this exploration
program.

Gravity Modeling:
Depth slices from surface through the gravity model of CRS GeoSurveys Ltd. 2022 survey of the Mount Thom Cu-CoAu Property, Colchester County, Nova Scotia:

Historical Exploration at Mount Thom

Mount Thom has a rich exploration history. Between 1970 and 1974, Imperial Oil and other operators completed
trenching and 49 diamond drillholes totalling 3,184 m. Drilling encountered widespread fracture and brecciacontrolled mineralization with pyrite, chalcopyrite, hematite, and specularite across a large area. While intersections
of chalcopyrite-pyrite were sporadic, grades up to 1.66% Cu over 5 m were reported.
A historic 1970 small (non-NI 43-101 compliant) copper deposit was outlined near surface, generally above 50 m
depth. In 1989 resampling of existing core by the Nova Scotia Department of Mines confirmed Imperial’s copper
grades (0.5–2.0% Cu) and revealed significant cobalt enrichment (up to 5,740 ppm Co) in select core samples. K. E.
Northcote the author also noted some elevated gold values (up to 296 ppb Au). The presence of cobalt alongside
copper further strengthens Mount Thom’s standing as a critical mineral opportunity.

Management Commentary

“We are very pleased to have received this shared funding from the Nova Scotia Government through the NSMRDF,”
said Terry Coughlan, CEO & President of Mongoose Mining. “The grant acknowledges both the geological significance
of Mount Thom and the potential for this project to contribute to Canada’s critical minerals future. With the
upcoming drill program, we are advancing beyond the shallow historic drilling to test deeper, high-density targets
highlighted by the 2022 gravity survey. This is a pivotal step toward unlocking the full potential of Mount Thom.”

Financing Exploration and Growth
Mongoose is pleased to announce a proposed non-brokered private placement (the “Offering”) for gross proceeds
of up to $300,000 at a price of $0.10 per share.
The Offering will consist of:

• • Flow-Through Shares: Up to 2,000,000 flow-through shares at a price of $0.10 per share, raising gross
    proceeds of up to $200,000.

• • Hard Dollar Shares: Up to 1,000,000 common shares at a price of $0.10 per share, raising gross proceeds
    of up to $100,000.

As a condition of the Offering, each purchase of two flow-through shares must be accompanied by the purchase of
one hard dollar share.
Whereas copper and cobalt qualify under the federal Critical Mineral Exploration Tax Credit (CMETC), the flowthrough shares are expected to be eligible for the enhanced 30% tax credit, providing investors with additional
incentives.

Use of Proceeds

The net proceeds from the Offering will be used to fund exploration and advancement of the Company’s projects in
Atlantic Canada. The gross proceeds raised from the sale of flow-through shares will be used to incur Canadian
Exploration Expenses (“CEE”), as defined in the Income Tax Act (Canada). Such expenses will qualify as “flow-through
mining expenditures” related to the Company’s exploration programs in Nova Scotia and New Brunswick and will be
renounced to subscribers with an effective date no later than December 31, 2025.

Additional Terms

The Offering is subject to the receipt of all necessary regulatory approvals, including acceptance by the Canadian
Securities Exchange (“CSE”). All securities issued under the Offering will be subject to a hold period of four months
and one day from the closing date in accordance with applicable securities laws. The Company may pay finder’s fees
to qualified parties in connection with the Offering.
Certain insiders of the Company may participate in the Offering. Any such participation will constitute a “related
party transaction” under Multilateral Instrument 61-101 – Protection of Minority Security Holders in Special
Transactions (“MI 61-101”). The Company expects that such participation will be exempt from the formal valuation
and minority shareholder approval requirements of MI 61-101, as neither the fair market value of the securities
subscribed for, nor the consideration paid, will exceed 25% of the Company’s market capitalization.
This news release does not constitute an offer to sell or a solicitation of an offer to buy securities in the United States.
The securities have not been and will not be registered under the United States Securities Act of 1933, as amended
(the “U.S. Securities Act”), or any state securities laws, and may not be offered or sold in the United States or to U.S.
persons unless registered under the U.S. Securities Act and applicable state securities laws, or an exemption from
such registration is available.

Qualified Person

The scientific and technical information contained in this news release has been reviewed and approved by Terry
Coughlan, P.Geo., the Company’s Chief Executive Officer and a Qualified Person within the context of Canadian
Securities Administrators’ National Instrument 43-101; Standards of Disclosure for Mineral Projects (“NI 43-101”).
About Mongoose Mining Ltd.
Mongoose Mining is a Canadian exploration company focused on advancing its portfolio of mineral projects in
Canada. The Company is committed to responsible exploration practices and to creating value through discovery,
technical excellence, and strong community partnerships.

Forward-Looking Statements

This news release contains “forward-looking statements” within the meaning of applicable securities laws. Forwardlooking statements include, but are not limited to, statements regarding the Company’s planned exploration
activities, anticipated results from drilling, potential mineralization, the success of financing initiatives, the use of
proceeds from the Offering and the eligibility of flow-through shares under the Critical Mineral Exploration Tax Credit.
Forward-looking statements are based on management’s reasonable assumptions at the time they are made.
However, they are subject to risks, uncertainties, and other factors that may cause actual results to differ materially
from those expressed or implied. These risks and uncertainties include but are not limited to exploration findings,
results, plans and recommendations, ability to raise adequate financing, and market and economic risks associated
with market and economic circumstances, as well as those risks and uncertainties identified and reported in
Mongoose’s public filings under its SEDAR profile at www.sedarplus.ca. Although Mongoose has attempted to
identify important factors that could cause actual actions, events, or results to differ materially from those described

in forward-looking information, there may be other factors that cause actions, events or results not to be as
anticipated, estimated or intended. There can be no assurance that such information will prove to be accurate as
actual results and future events could differ materially from those anticipated in such statements Readers are
cautioned not to place undue reliance on forward-looking statements. Except as required by applicable law, the
Company undertakes no obligation to update or revise any forward-looking statements.
Neither the CSE nor its Regulation Services Providers (as that term is defined in the policies of the CSE) accepts
responsibility for the adequacy or accuracy of this release.

For more information contact:
Terry Coughlan, CEO (902) 499-2211
[email protected]
www.mongoosemining.com