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First Mining’s Partner, Auteco Minerals, Expands Drill Program at Pickle Crow Gold Project, Ontario, Canada

Exploration Programs

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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NEWS RELEASE

First Mining’s Partner, Auteco Minerals, Expands Drill Program at

Pickle Crow Gold Project, Ontario, Canada

September 3, 2020 – Vancouver, Canada – First Mining Gold Corp. (“First Mining” or the “Company”)

(TSX: FF) (OTCQX: FFMGF) (FRANKFURT: FMG) is pleased to report that Auteco Minerals Ltd. (“Auteco”)

(ASX: AUT), First Mining’s partner on its Pickle Crow Gold Project in northwestern Ontario (“Pickle Crow”

or the “Project”) has increased its current drill program at Pickle Crow from 10,000 metres (m) to 45,000m.

Highlights:

• Diamond drill program expanded to 45,000m

• Two drill rigs currently active, third expected to be mobilized in late September

• 19 drill holes (4,400m) completed to date

As part of its earn-in agreement with First Mining, Auteco has actively been exploring the Pickle Crow

deposit, with one diamond drill rig in operation since May 2020 and a second drill rig mobilized to site in

July. To expedite potential resource growth and test multiple step-out targets, a third rig is scheduled to

be mobili zed in late September 2020 . Based on in itial exploration results and observations to date ,

Auteco’s drill program has been expanded from 10,000m to 45,000m, with a 24-person, all-season camp

to be established on site to support exploration activities.

To date, nineteen drill holes totalling 4,464m have been completed. Assay results and drill highlights will

be reported in an upcoming news release.

Exploration efforts are currently focused on the definition of potential additional resources within the

Core Trend, which is host to the current infe rred resource and the historical mining and infrastructure .

Numerous walk-up drill targets ‘in the shadow of the headframe’ have been identified from historical

drilling datasets , and the current drilling is adding geological confidence to the significant historical

intercepts to enable conversion to JORC and NI 43-101 mineral resources.

Reconnaissance exploration drilling has resulted in three new , high-grade gold discoveries/extensions

already, with significant step -out minerali zation returned from Vein 5 extensions, Vein 11 extensions

including a new footwall discovery, and a new Vein 112.

Auteco’s aggressive drill program is fully funded following its recent A$30.4 million capital raising.

First Mining entered into an earn-in agreement with Auteco on March 12, 2020 whereby Auteco may earn

up to an 80% interest in PC Gold Inc., the Company’s wholly -owned subsidiary that owns Pickle Crow.

Auteco can earn a full 80% interest by incurring a total of $10 million in exploration expenditures over five

years, making cash payments to First Mining totaling $4.1 million, and issuing 125 million shares of Auteco

to First Mining. Upon completion of the second stage of the earn-in (at which time Auteco’s interest in PC

Gold Inc., and thereby the Project, would be at 70%), First Mining will be granted a 2% Net Smelter Returns

(“NSR”) Royalty, 1% of which can be bought back for US$2.5 million.

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OTCQX: FFMGF

FRANKFURT: FMG

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Management Change

First Mining also announces that, effective September 2, 2020, Ms. Mal Karwowska has resigned from her

position as Vice President, Corporate Development of First Mining.

“On behalf of the Board of Directors and all the team at First Mining, I want to sincerely thank Mal for her

dedicated service to the Company as VP Corporate Development and wish h er the best in h er future

endeavours”, stated Dan Wilton, CEO.

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.

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 1. A Pre -Feasibility Study is underway, with

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

Impact Statement targeted for 2021. The Company also holds a large equity position in Treasury Metals

who are advancing the Goliath -Goldlund gold project s in Ontario towards construction. First Mining’s

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

with Auteco Minerals Ltd.), Cameron, Hope Brook, Duparquet, Duquesne, and Pitt gold projects.

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 8825 | Toll Free: 1 844 306 8827 | Email: [email protected]

www.firstmininggold.com

Note:

1.These numbers are from the independent technical report titled “Preliminary Economic Assessment Update for

the Springpole Gold Project, Ontario, Canada” , dated November 5, 2019, which was prepared by SRK Consulting

(Canada) Inc. in accordance with National Instrument 43-101 Standards of Disclosure for Mineral Projects (“NI

43-101”) and is available at www.sedar.com under First Mining’s SEDAR profile. Readers are cautioned th at the

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PEA is preliminary in nature, 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 reserves, and there is no certainty that the PEA will be realized.

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 freq uently, 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 ac tions, 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) ) the mobilization of a third drill rig to Pickle Crow in late September 2020; (ii) timing for the receipt

of outstanding assays from the current drill program at Pickle Crow and the interpretation of the results of such

assays; (iii) the disclosure of assay results and highlights of the current drill program at Pickle Crow in future news

releases issued by the Company ; (iv) the potential to increase the amount of mineral resources in the Core Trend at

Pickle Crow through the current drill program; (v) the timing of all expenditure and payment requirements under the

Company’s earn-in agreement with Auteco, and the potential for the Company to be granted a 2% NSR royalty on

Pickle Crow upon completion of the second stage of the earn -in; (vi) timing for the completion of a Pre -Feasibility

Study for Springpole; (vii) timing for the submission o f an Environmental Impact Statement for Springpole; (viii) the

Company’s focus on advancing its assets towards production; and (ix) 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 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 r easonable 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 facto rs include, without

limitation the Company’s business, operations and financial condition potentially being materially adversely affected

by the outbreak of epidemics, pandemics or other health crises, such as COVID -19, and by reactions by government

and private actors to such outbreaks; risks to employee health and safety as a result of the outbreak of epidemics,

pandemics or other health crises, such as COVID -19, that may result in a slowdown or temporary suspension of

operations at some or all of the Com pany's mineral properties as well as its head office; 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, 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 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.

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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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 shou ld

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 oth erwise 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 Re serves. 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 for egoing, 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 extra cted 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 pa rt 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 issue rs 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.