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First Mining Upsizes and Closes Second Tranche of Private Placement Financing

Financings

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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NEWS RELEASE

NOT FOR DISTRIBUTION TO UNITED STATES NEWS WIRE SERVICES

OR FOR DISSEMINATION IN THE UNITED STATES

First Mining Upsizes and Closes Second Tranche of Private Placement Financing

February 28, 2020 – Vancouver, BC – First Mining Gold Corp. (“First Mining” or the “Company”) (TSX:

FF) (OTCQX: FFMGF) (FRANKFURT: FMG) is pleased to announce that due to strong demand, the Company

has upsized and closed a second tranche of its previously announced non -brokered private placement

financing (the “Offering”) for gross proceeds of $5.1 million (the “Second Tranche”). Along with the initial

tranche, First Mining has now raised total gross proceeds of $7.6 million. Due to increased demand, First

Mining will close a third, and final, tranche of the Offering on March 6, 2020.

Pursuant to the Second Tranche, the Company issued 23,328,818 units of the Company (the “Units”) at a

price of $0.22 per Unit for gross proceeds of $5,132,340. Each Unit consists of one common share of the

Company (a “Unit Share”) and one-half of one common share purchase warrant (each whole common

share purchase warrant, a “Warrant”). Each Warrant will entitle the holder to acquire one common share

of the Company at a price of $0.33 at any time prior to February 28, 2023.

The net proceeds raised from the sale of the Units under the Second Tranche will be used by the Company

for development and permitting activities a t its Canadian gold projects, as well as for general working

capital purposes.

The Unit Shares are subject to a statutory hold period of four months and one day from closing, expiring

on June 29, 2020.

This news release does not constitute an offer to sell or a solicitation of an offer to buy any of the securities

in the United States. The securities have not been and will not be registered under the United States Act of

1933, as amended (the “U.S. Securities Act”) or any state securities laws and may not be offered or sold

within the United States or to U.S. Persons (as such term is defined in Regulation S under the U.S. Securities

Act) unless registered under the U.S. Securities Act and applicable state securities laws or an exemption

from such registration is available.

About First Mining Gold Corp.

First Mining Gold Corp. is an emerging development company with a diversified portfolio of gold projects

in North America. Having assembled a large resource base of 7.4 million ounces of gold in the Measured

and Indicated categories and 3.8 million ounces of gold in the Inferred category in mining friendly

jurisdictions of eastern Canada, First Mining is now focused on advancing its material assets towards a

construction decision and, ultimately, to production. The Company currently ho lds a portfolio of 24

mineral assets in Canada, Mexico and the United States.

ON BEHALF OF FIRST MINING GOLD CORP.

Daniel W. Wilton

Chief Executive Officer and Director

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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For further information, please contact:

Mal Karwowska | Vice President, Corporate Development & Investor Relations

Direct: 604.639.8824 | 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”, “plans”, “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 achi eved, 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 closing a final tranche of the Offering on March 6, 2020; (ii) the use of the net

proceeds from the sale of the Unit Shares for development and permitting activities at the Company’s Canadian gold

projects, and for general working capital purposes ; (ii i) the Company’s focus on advancing its as sets towards

production; and (iv) realizing the value of the Company’s gold projects for the Company’s shareholders. 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 resul ts and future events 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 considered 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 achievements 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 cur rency 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, development 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; r elationships with and claims by

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

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, 2018 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, investo rs and others should

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.

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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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 otherwise 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 Miner al Resources and Mineral Reserves. 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 s tandards, 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 foregoing, 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 extracted 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 part 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 issuers 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.