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First Mining Files Preliminary Base Shelf Prospectus and Registration Statement

Financings

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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NEWS RELEASE

First Mining Files Preliminary Base Shelf Prospectus and

Registration Statement

September 3, 2021 – Vancouver, BC – First Mining Gold Corp. (“First Mining” or the “Company”) (TSX:

FF) (OTCQX: FFMGF) (FRANKFURT: FMG) announces that it has filed a preliminary short form base shelf

prospectus (the “Preliminary Shelf Prospectus”) with the securities commissions in each of the provinces

of Canada, and a corresponding registration statement on Form F-10 (the “Registration Statement”) with

the United States Securities and Exchange Commission ( the “ SEC”) under the U.S./Canada

Multijurisdictional Disclosure System.

First Mining has filed this Preliminary Shelf Prospectus and the Registration Statement to provide the

Company with greater financial flexibility going forward but has not entered into any agreements or

arrangements to authorize or offer any Securities (as defined below) at this time.

When made final or effective, the Preliminary Shelf Prospectus and corresponding Registration Statement

will allow First Mining to undertake offerings of common shares (including common s hares issued on a

“flow-through” basis), preferred shares, warrants, subscription receipts and units (collectively, the

“Securities”), or any combination thereof, up to an aggregate total of C$100 million from time to time

during the 25 -month period that t he final short form base shel f prospectus remains effective. The

Securities may be offered in amounts, at prices and on terms to be determined at the time of sale and,

subject to applicable regulations, may include “at-the-market” transactions, public offerings or strategic

investments. The specific terms of any offering of Securities, including the use of proceeds from any

offering, will be set forth in one or mor e shelf prospectus supplement(s) to be filed with applicable

securities regulators.

A copy of the P reliminary Shelf Prospectus, and copies of the final short form base shelf prospectus and

any shelf prospectus supplements that may be filed in the future, can be found under the Company’s

SEDAR profile at www.sedar.com and on EDGAR at www.sec.gov, or may be obtained by request to Samir

Patel, First Mining’s General Counsel & Corporate Secretary, Suite 2070 – 1188 West Georgia Street,

Vancouver, British Columbia V6E 4A2, Canada (tel: 1-844-306-8827), or to [email protected].

No securities regulatory authority has either approved or disapproved the contents of this news release.

The Registration Statement filed today with the SEC has not yet become effective. No Securities may be

sold, nor may offers to buy be accepted, prior to the time the Preliminary Shelf Prospectus and

Registration Statement become effective. This news release does not constitute an offer to sell or a

solicitation of an offer to buy any securities of the Company in any jurisdiction in which such offer,

solicitation or sale would be unlawful.

About First Mining Gold Corp.

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

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

Canada. The results of a positive Pre-Feasibility Study for the Springpole Gold Project were announced by

First Mining in January 2021, and permitting activities are on-going with submission of an Environmental

Impact Statement (“EIS”) for the project targeted for 2021. The Company also holds a large equity position

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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in Treasury Metals Inc. who are advancing the Goliath Gold Complex toward construction. First Mining’s

portfolio of gold projects in eastern Canada also includes the Pickle Crow (being advanced in partnership

with Auteco Minerals Ltd.), Hope Brook (being advanced in partnership with Big Ridge Gold Corp.),

Cameron, Duparquet, Duquesne, and Pitt gold projects.

First Mining was established 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:

Richard Huang | Vice President, Corporate Development

Direct: +1 604 639 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 Private 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”, “opportunities”, “objectives”, “targeted”, “advancing”, “proving” or

variations thereof or stating that certain actions, events or results "may", "could", "would", "might" or "will" be taken,

occur or be achieved, 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) t he filing and effectiveness of the final base shelf prospectus and corresponding Registration

Statement; (ii) the filing and effectiveness of any potential prospectus supplement; (iii) the amount and terms of any

Securities to be offered; (iv) the Company’s focus on advancing its as sets towards production; (v) timing for the

submission of the EIS for the Springpole Gold Project; and (vi) realizing the value of the Company’s gold projects f or

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 informatio n currently available to them. There can be no

assurance that such statements will prove to be accurate, and actual results 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: the timing and filing

of the final base shelf prospectus and corresponding Registration Statement; the potential offering of any S ecurities

by the Company ; uncertainty with respect to the completion of any future offering ; the ability to obtain applicable

regulatory approval for any contemplated offerings ; the ability of the Company to negotiate and complete future

funding transactions ; fluctuations in the spot and forward price of gold, silver, base metals or cert ain 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;

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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risks and hazar ds 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; relationships 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 ex ploration and development; title to

properties.; and the additional risks described in the Company’s Annual Information Form for the year ended

December 31, 2020 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 d ecisions with respect to First Mining, investors 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.

Cautionary Note to United States Investors

This news release has been prepared in accordance with the requirements of Canadian securities laws, which differ

in certain material respects from the disclosure requirements of United States securities laws. The terms “mineral

reserve”, “proven mineral reserve” and “probable mineral reserve” are Canadian mining terms as defined in

accordance with NI 43-101 and the Canadian Institute of Mining, Metallurgy and Petroleum (“CIM”) 2014 Definition

Standards on Mineral Resources and Mineral Reserves, adopted by the CIM Council, as may be amended from time

to time. These definitions differ from the definitions in the United Stat es Securities and Exchange Commission (the

“SEC”) rules applicable to domestic United States companies. In addition, the terms “mineral resource”, “measured

mineral resource”, “indicated mineral resource” and “inferred mineral resource” are defined under t he 2014 CIM

definition standards, and are required to be disclosed by NI 43 -101. However, these terms are not defined under the

SEC rules applicable to domestic United States companies. Accordingly, information concerning mineral deposits set

forth in this news release may not be comparable with information made public by companies that report in

accordance with U.S. standards.