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First Mining Announces US$22.5 Million Funding Agreement to Advance the Springpole Gold Project First Mining Signs Definitive Agreement to Sell a 50% Silver Stream on the Springpole Gold Project to First Majestic Silver

Financings Drill Results Mergers & Acquisitions Royalties & Streams

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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NEWS RELEASE

First Mining Announces US$22.5 Million Funding Agreement

to Advance the Springpole Gold Project

First Mining Signs Definitive Agreement to Sell a

50% Silver Stream on the Springpole Gold Project to First Majestic Silver

June 11, 2020 – Vancouver, Canada – First Mining Gold Corp. (“First Mining” or the “Company”) (TSX:

FF) ( OTCQX: FFMGF ) ( FRANKFURT: FMG ) is pleased to announce that it has entered into a funding

agreement (the “Agreement”) with First Majestic Silver Corp. (“First Majestic”) (TSX: FR) (NYSE: AG) in

relation to the Company’s 100%-owned Springpole Gold Project (“Springpole” or the “Project”) located in

Ontario, Canada. Under the terms of the Agreement, First Majestic will pay First Mining total

consideration of US$22.5 million for the right to purchase 50% of the payable silver produced from

Springpole for the life of the Project (the “Stream”). Further details are set out below under “Silver Stream

Agreement Details”.

“We are excited to enhance our strategic partnership with First Majestic to fund Springpole through the

completion of the Pre-Feasibility and Environmental Assessment processes”, stated Dan Wilton, CEO of

First Mining Gold. “This agreement is the result of a year -long process to explore non-dilutive financing

alternatives with a number of different parties. This silver stream sale leverages Springpole’s potential by-

product revenue, strengthens our balance sheet, and provides a less dilutive source of funding to support

our continued advancement of one of the largest undeveloped open-pit gold deposits in North America.”

Benefits of the Transaction

• Secures a less dilutive source of funding to advance Springpole through a key de -risking phase, with

the advancement of technical studies, environmental permitting, and community consultation

• Provides First Mining with sufficient capital to fund Springpole development through the completion

of a Pre-Feasibility Study (“PFS”) for Springpole and the Environmental Assessment processes, as well

as corporate G&A through 2023

• Leaves the Springpole project substantially unencumbered while maintaining robust potential cash

costs and all-in sustaining costs

• Increases strategic relationship with First Majestic to leverage their significant technical and operating

expertise for the benefit of Springpole development

Silver Stream Agreement Details

First Mining’s wholly-owned subsidiary, Gold Canyon Resources Inc., which owns 100% of Springpole, has

entered into a definitive silver purchase agreement with First Majestic. The key terms of the Agreement

are as follows:

Silver Stream

• First Majestic will purchase 50% of the payable silver that will be produced from Springpole by First

Mining for the life of the Project

First Mining Consideration

• US$10 million on closing of the Agreement, with US$2.5 million payable in cash and the remaining

$7.5 million payable in common shares of First Majestic (the “First Majestic Shares”) based on the

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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volume-weighted average trading price (“VWAP”) of the First Majestic Shares on the Toronto Stock

Exchange (the “TSX”) for the 20 trading days up to the day immediately prior to the closing date

• US$7.5 million upon First Mining publicly announcing the completion of a positive PFS for Springpole,

with US$3.75 million payable in cash and US$3.75 million payable in First Majestic Shares (based on

20-day VWAP)

• US$5 million upon First Mining receiving approval of a Federal or Provincial Environmental

Assessment for the Project , with US$2.5 million payable in cash and the balance in First Majestic

Shares (based on 20-day VWAP)

• The First Majestic Shares shall be subject to a statutory four month and one day hold period pursuant

to applicable Canadian securities laws

Buyback Right

• First Mining has the right to repurchase 50% of the Stream for US$22.5 millio n at any time prior to

the commencement of commercial production at Springpole

Warrant Issuance to First Majestic

• As part of the Agreement , First Mining will issue 30 million common share purchase warrants

(“Warrants”) to First Majestic on the closing date. Each Warrant will entitle First Majestic to purchase

one common share of First Mining at an exercise price of $0.40 for a period of five years

Future Silver Stream Cash Payments

• First Majestic will make ongoing cash payments to First Mining equal to 33% of the lesser of the

average spot price of silver for the applicable calendar quarter, and the spot price of silver at the time

of delivery, subject to a price cap of US$7.50 per ounce of silver (the “Price Cap”)

• The Price Cap is subject to annual inflation escalation of 2%, commencing at the start of the third year

of commercial production at the Project

Technical Committee

• First Mining and First Majestic will form a three-member technical committee (the “Technical

Committee”) comprised of two members from First Mining and one member from First Majestic. The

Technical Committee will advise First Mining on metallurgical testing, process flow sheet development

and through the completion of PFS and Feasi bility studies for Springpole, leveraging First Majestic’s

operating experience, intellectual property, and infrastructure

Other Details

• First Mining has granted a right of first refusal to First Majestic with respect to any future silver stream

financings for Springpole

Transaction Conditions and Timing

First Majestic will need to obtain TSX approval to list the First Majestic Shares that are part of the

consideration, and First Mining will need to obtain TSX approval to list the common shares of First Mining

issuable upon exercise of the Warrants. The transaction is expected to close in early July 2020.

Advisors and Counsel

Cormark Securities Inc. is acting as the Company’s financial advisor and Cassels, Brock & Blackwell LLP is

acting as the Company’s legal advisor.

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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Conference Call and Webcast

Management of First Mining will host a webcast on Friday, June 12, 2020 at 7 a.m. Pacific time / 10 a.m.

Eastern time to discuss the merits of the Stream transaction, First Mining’s recent developments, and to

answer shareholder questions. Shareholders, analysts, investors, and media are invited to join the live

webcast by registering using the following link:

https://us02web.zoom.us/webinar/register/1515918221588/WN_UEgMChWtSRuiKLkb3iWjEQ

After registering, you will receive a confirmation email containing details to access the webinar via

conference call or webcast.

A replay of the webcast will be available on First Mining’s website following the conclusion of the call.

Qualified Person

Hazel Mullin, P.Geo., Director, Data Management and Technical Services of First Mining, is a “Qualified

Person” for the purposes of National Instrument 43-101 Standards of Disclosure for Mineral Projects (“NI

43-101”), and she has reviewed and approved the scientific and technical disclosure contained in this

news release.

Springpole Gold Project

Springpole is one of the largest undeveloped open pit gold assets in Canada, with permitting and a Pre -

Feasibility Study underway. The Project covers 41,943 hectares in northwestern Ontario, located

approximately 110 kilometres northeast of Red Lake. Springpole currently hosts 4.67 million ounces gold

in the Indicated category and 0.23 million ounces gold in the Inferred category , and the results of a

Preliminary Economic Assessment study published in 2019 (“PEA”) showcased the Project’s size and scale.

The study highlights an open pit mine and milling operation with the potential to produce an average of

410,000 ounces of gold annually when in production (years two to nine). First Mining acquired the Project

in November 2015 through its acquisition of Gold Canyon Resources Inc.

For additional details, including a description of data verification and QA/QC procedures, refer to the

technical report titled “Preliminary Economic Assessment Update for the Springpole Gold Project, Ontario,

Canada”, dated November 5, 2019, which was prepared for First Mining by SRK Consulting (Canada) Inc.

in accordance with NI 43 -101, and which is available under First Mining’s SEDAR profile at

www.sedar.com. First Mining notes that the PEA is preliminary in nature, in that it includes inferred

mineral resources that are considered too speculative geologically to have the economic considerations

applied to them that would enable them to be categorized as mineral rese rves, and that there is no

certainty that the PEA will be realized.

About First Mining Gold Corp.

First Mining is a Canadian gold developer focused on the development and permitting of the Springpole

Gold Project in northwestern Ontario. Springpole is one of the largest undeveloped gold projects in

Canada, currently hosting a mineral resource base of 4.67 million ounces of gold in the Indicated category

and 0.23 million ounces of gold in the Inferred category. A Pre-Feasibility Study is underway, with

completion targeted in early 2021, and permitting is on -going with submission of the EIS targeted for

2021. The Company is also in the process of closing its announced transaction with Treasury Metals Inc.,

after which it will hold a large equity position in Treasury that is advancing the Goliath -Goldlund gold

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OTCQX: FFMGF

FRANKFURT: FMG

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project towards construction. First Mining’s eastern Canadian property portfolio also includes Pickle Crow

(being advanced in partnership with Auteco Minerals Ltd.), Cameron, Hope Brook, Duparquet, Duquesne,

and Pitt.

First Mining was created in 2015 by Mr. Keith Neumeyer, founding President and CEO of First Majestic

Silver Corp.

ON BEHALF OF FIRST MINING GOLD CORP.

Daniel W. Wilton

Chief Executive Officer and Director

For further information, please contact:

Spiros Cacos | Vice President, Investor Relations

Direct: 1.604.639.8827 | Toll Free: 1.844.306.8827 | Email: [email protected]

www.firstmininggold.com

Cautionary Note Regarding Forward-Looking Statements

This news release includes certain "forward -looking information” and "forward -looking statements” (collectively

"forward-looking statements”) within the meaning of applicable Canadian and United States securities legislation

including the United States Pri vate Securities Litigation Reform Act of 1995. These forward -looking statements are

made as of the date of this news release. Forward -looking statements are frequently, but not always, identified by

words such as "expects”, "anticipates”, "believes”, “plan s”, “projects”, "intends”, "estimates”, “envisages”,

"potential”, "possible”, “strategy”, “goals”, “objectives”, or variations thereof or stating that certain actions, events

or results "may", "could", "would", "might" or "will" be taken, occur or be achie ved, or the negative of any of these

terms and similar expressions.

Forward-looking statements in this news release relate to future events or future performance and reflect current

estimates, predictions, expectations or beliefs regarding future events and include, but are not limited to, statements

with respect to: (i) the Company’s focus on advancing its assets towards production;(ii) realizing the value of the

Company’s gold projects for the Company’s shareholders ; . (iii) future prices of gold, silver , base metals and certain

other commodities; (iv) the timing and amount of estimated future production; and (iv) the potential to enhance the

economics of the Springpole through enhancing processing or other technologies. All forward-looking statements are

based on First Mining's or its consultants' current beliefs as well as various assumptions made by them and

information currently available to them. There can be no assurance that such statements will prove to be accurate,

and actual results and future ev ents could differ materially from those anticipated in such statements. Forward -

looking statements reflect the beliefs, opinions and projections on the date the statements are made and are based

upon a number of assumptions and estimates that, while consid ered reasonable by the respective parties, are

inherently subject to significant business, economic, competitive, political and social uncertainties and contingencies.

Many factors, both known and unknown, could cause actual results, performance or achieve ments to be materially

different from the results, performance or achievements that are or may be expressed or implied by such forward -

looking statements and the parties have made assumptions and estimates based on or related to many of these

factors. Such factors include, without limitation: failure to obtain regulatory approval; demand for the Units and FT

Units; fluctuations in the spot and forward price of gold, silver, base metals or certain other commodities; fluctuations

in the currency markets (such as the Canadian dollar versus the U.S. dollar); changes in national and local

government, legislation, taxation, controls, regulations and political or economic developments; risks and hazards

associated with the business of mineral exploration, developme nt and mining (including environmental hazards,

industrial accidents, unusual or unexpected formations, pressures, cave -ins and flooding); the presence of laws and

regulations that may impose restrictions on mining; employee relations; relationships with a nd claims by local

communities, indigenous populations and other stakeholders; availability and increasing costs associated with

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OTCQX: FFMGF

FRANKFURT: FMG

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mining inputs and labour; the speculative nature of mineral exploration and development; title to properties.; and

the additional risks described in the Company’s Annual Information Form for the year ended December 31, 2019 filed

with the Canadian securities regulatory authorities under the Company’s SEDAR profile at www.sedar.com, and in

the Company’s Annual Report on Form 40-F filed with the SEC on EDGAR.

First Mining cautions that the foregoing list of factors that may affect future results is not exhaustive. When relying

on our forward -looking statements to make decisions with respect to First Mining, investors and others shoul d

carefully consider the foregoing factors and other uncertainties and potential events. First Mining does not undertake

to update any forward -looking statement, whether written or oral, that may be made from time to time by the

Company or on our behalf, except as required by law.

Cautionary Note to United States Investors

This news release has been prepared in accordance with the requirements of the securities laws in effect in Canada,

which differ from the requirements of U.S. securities laws. Unless othe rwise indicated, all resource and reserve

estimates included in this news release have been prepared in accordance with NI 43-101 and the Canadian Institute

of Mining, Metallurgy, and Petroleum 2014 Definition Standards on Mineral Resources and Mineral Res erves. NI 43-

101 is a rule developed by the Canadian Securities Administrators which establishes standards for all public disclosure

an issuer makes of scientific and technical information concerning mineral projects. Canadian standards, including

NI 43 -101, differ significantly from the requirements of the SEC, and mineral resource and reserve information

contained herein may not be comparable to similar information disclosed by U.S. companies. In particular, and

without limiting the generality of the fore going, the term "resource” does not equate to the term "reserves”. Under

U.S. standards, mineralization may not be classified as a "reserve” unless the determination has been made that the

mineralization could be economically and legally produced or extrac ted at the time the reserve determination is

made. The SEC's disclosure standards normally do not permit the inclusion of information concerning "measured

mineral resources”, "indicated mineral resources” or "inferred mineral resources” or other descriptions of the amount

of mineralization in mineral deposits that do not constitute "reserves” by U.S. standards in documents filed with the

SEC. Investors are cautioned not to assume that any part or all of mineral deposits in these categories will ever be

converted into reserves. U.S. investors should also understand that "inferred mineral resources” have a great amount

of uncertainty as to their existence and great uncertainty as to their economic and legal feasibility. It cannot be

assumed that all or any par t of an "inferred mineral resource” will ever be upgraded to a higher category. Under

Canadian rules, estimated "inferred mineral resources” may not form the basis of feasibility or pre-feasibility studies

except in rare cases. Investors are cautioned not to assume that all or any part of an "inferred mineral resource”

exists or is economically or legally mineable. Disclosure of "contained ounces” in a resource is permitted disclosure

under Canadian regulations; however, the SEC normally only permits issuer s to report mineralization that does not

constitute "reserves” by SEC standards as in -place tonnage and grade without reference to unit measures. The

requirements of NI 43 -101 for identification of "reserves” are also not the same as those of the SEC, and reserves

reported by the Company in compliance with NI 43 -101 may not qualify as "reserves” under SEC standards.

Accordingly, information concerning mineral deposits set forth herein may not be comparable with information made

public by companies that report in accordance with U.S. standards.