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FF.TO ·

First Mining Completes Geotechnical Drilling FOR the Dyke Foundations at the Springpole Project

Exploration Programs

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FIRST MINING COMPLETES GEOTECHNICAL DRILLING FOR THE DYKE

FOUNDATIONS AT THE SPRINGPOLE PROJECT

April 19, 2018

VANCOUVER, BC, CANADA – First Mining Gold Corp. (“First Mining” or the

“Company”) is pleased to announce the successful completion of the geotechnical drilling

program to investigate the lake bed sediments and bedrock along the proposed alignment of

the dykes (coffer dam) at its Springpole Gold Project. The preliminary results are encouraging

and indicate:

 Thicknesses of soft lake bed sediments are much thinner than anticipated and are

absent in some areas. This means that dredging and removal of the lake bed

sediments beneath the footprint of the dykes may not be necessary.

 Overburden mainly comprise granular materials with one small area encountering an

overconsolidated clay deposit.

 Packer tests undertaken within the underlying bedrock gave inflow rates of less than

1.5 x 10-5 m/s.

Jeff Swinoga, First Mining Gold’s President and CEO, stated: “We are very pleased that the

preliminary findings show the bedrock beneath the proposed dykes will provide a competent

foundation. We see this as a significant step forward in advancing our Springpole Project since

this confirms that the dykes can be constructed in the area that was proposed in Springpole’s

preliminary economic assessment published last year. We have also engaged Tetra Tech to

complete the next step which is to finalize the design work on the dyke structures”.

The pre-feasibility level geotechnical drilling program has been completed over the 800 metre

(approximately) long footprint of the dykes which are required to dewater the north bay of

Springpole Lake (Figure 1). Supervised by staff of Tetra Tech Canada Inc. (Tetra Tech) ,

eleven holes were drilled totaling 171.6 m etres of rock, 17.5 metres of overburden, and 55.7

metres of water. Water depth over the planned dykes ranged from 1.6 to 11.7 met res,

averaging 5 met res deep. Packer testing was undertaken in all boreholes to measure the

bedrock hydraulic conductivity, which showed low to very low values generally ranging

between 1.5 × 10-5 m/s and 1.6 × 10-7 m/s. Tetra Tech will use this data to design and develop

a construction cost estimate for the dykes as part of the prefeasibility level study.

Figure 1. North bay of Springpole Lake showing proposed area to be dewatered and location of

the proposed dewatering dykes (coffer dam)

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 seven million

ounces of gold in the Measured and Indicated categories and five million oun ces of

gold in the Inferred category in mining friendly jurisdictions of eastern Canada, First Mining is

now focused on advancing its assets towards production. The Company currently holds a

portfolio of 25 mineral assets in Canada, Mexico and the United States with a focus on gold.

For further information, please contact:

Derek Iwanaka

Vice President Investor Relations

Toll-Free: 1-844-306-8827

Email: [email protected]

Website: www.firstmininggold.com

ON BEHALF OF FIRST MINING GOLD CORP.

“Keith Neumeyer”

Keith Neumeyer

Chairman

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”, “objectives”, 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 si milar 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 wit h respect to: (i) there being no need to dredge and remove lake bed

sediments in the North bay of Springpole Lake beneath the footprint of the dykes ; (ii) the bedrock

beneath the proposed dykes providing a competent foundation; (iii) the finalization of the design work on

the dyke structures ; and (iv) the use of data by Tetra Tech to design and develop a construction cost

estimate for the dyke s as part of a prefeasibility level study for the Springpole Gold Project . 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. The most significant

assumptions are set forth above, but generally these assumptions include: (i) th at dredgin g and

removing lake bed sediments in the North bay of Springpole Lake beneath the footprint of the dykes will

not be required; (ii) no material issues will arise when the design work on the dyke structures is finalized;

and (iii) no material issues will arise when Tetra Tech designs and develops a construction cost estimate

for the dyke s. Although the Company’s management considers these assumptions to be reasonable

based on information currently available to it, they may prove to be incorrect.

By their very nature, forward-looking statements involve inherent risks and uncertainties, both general

and specific, and risks exist that estimates, forecasts, projections and other forward-looking statements

will not be achieved or that assumptions do not reflect f uture experience. We caution readers not to

place undue reliance on these forward-looking statements as a number of important factors could cause

the actual outcomes to differ materially from the beliefs, plans, objectives, expectations, anticipations,

estimates assumptions and intentions expressed in such forward-looking statements. These risk factors

may be generally stated as the risk that the assumptions and estimates expressed above do not occur

as forecast, but specifically include, without limitation: (i) risks relating to any material issues that may be

identified when the design work on the dyke structures is finalized, or when Tetra Tech designs and

develops a construction cost estimate for the dyke s; (ii) general risks relating to completing a

prefeasibility study for a mineral project in northwestern Ontario, Canada ; (iii) general risks related to

dewatering activities; (iv) general risks relating to permitting activities; (v) developments in world metals

markets; ( vi) risks relating to fluctuations in the Canadian dollar relative to the US dollar; (v ii)

management’s discretion to refocus the Company’s exploration efforts and/or alter the Company’s short

and l ong term business plans; and (viii) the additional risks described in First Mini ng's Annual

Information Form for the year ended December 31, 2017 filed with the Canadian securities regulatory

authorities under the Company’s SEDAR profile at www.sedar.com, and in First Mining’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 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 the securities laws in effect

in Canada, which differ from the requirements of U.S. securities laws. U nless otherwise indicated, all

resource and reserve estimates included in this news release have been prepared in accordance with

National Instrument 43-101 Standards of Disclosure for Mineral Projects ("NI 43-101”) and the Canadian

Institute of Mining, Me tallurgy, and Petroleum 2014 Definition Standards on Mineral 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 te chnical information

concerning mineral projects. Canadian standards, including NI 43 -101, differ significantly from the

requirements of the United States Securities and Exchange Commission ("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 do cuments 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, estima ted "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 gr ade 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 sta ndards. 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.