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First Mining Announces Drill Results from its Pickle Crow Gold Project

Drill Results

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NEWS RELEASE

First Mining Announces Drill Results from its Pickle Crow Gold Project

September 29, 2020 – Vancouver, Canada – First Mining Gold Corp. (“First Mining” or the “Company”)

(TSX: FF) (OTCQX: FFMGF) (FRANKFURT: FMG) is pleased to report initial results from the 2020 diamond

drill program currently underway at its Pickle Crow Gold Project (“Pickle Crow” or the “Project”) located

in northwestern Ontario, Canada. Auteco Minerals Ltd (“Auteco”) (ASX: AUT), First Mining’s partner on

Pickle Crow, is advancing the Project by completing a 45,000 metre (“m”) drill program aimed at

expediting resource growth and testing multiple walk-up targets.

To date, d rilling has intersected high -grade gold mineralization in numerous areas up to 250 m outside

the current resource area, with additional targets identified for further drilling in 2020.

Highlights:

• Hole AUDD0017 intersected 99.35 grams per tonne gold (“g/t Au”) over 0.6 m

o Including 181 g/t Au over 0.3 m

• Hole AUDD0019 intersected 19.64 g/t Au over 1.6 m

o Including 59.5 g/t Au over 0.5 m

• Hole AUDD0013 intersected 24.45 g/t Au over 1.7 m

o Including 122.0 g/t Au over 0.3 m

“We are excited with the initial result s intersected by our partner’s ongoing drill program”, stated Dan

Wilton, CEO of First Mining. “Auteco’s drill program at Pickle Crow has shown initial success and continues

to enlarge the areas of known mineralization and highlight the Project’s resource expansion potential.”

Auteco commenced its maiden drilling program at Pickle Crow in May this year. To date, nineteen holes

totaling 4,464 m have been completed, with assays returned for nine holes and partial assays for a further

six holes. Drilling has been successful in intersecting shallow, high-grade mineralization and these results

are being followed up with an expanded 45,000 m resource definition and discovery program now

underway on site. A 24 -person, all -season camp has been established on sit e to support exploration

activities.

To expedite resource growth and enable exploration step -outs, a third drill rig will be mobilized in the

coming weeks as part of the expanded drilling program.

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

‘Core Trend’, which is host to the current inferred resource and the historical mining and infrastructure.

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

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.

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Auteco can earn up to an 80% interest in the Company’s wholly-owned subsidiary PC Gold Inc. (“PC Gold”),

which owns the Project, and their aggressive drilling program is now fully funded following its recent

A$30.4m capital raising.

A plan map showing the Pickle Crow minerali zed trend , highlighting the latest drill results and new

identified zones of mineralization, can be viewed at:

https://www.firstmininggold.com/_resources/news/2020-09-FF-Pickle-Crow-Drill-Results.pdf

Select assay results from the first nineteen holes of the Auteco 2020 drill program are reported below.

Hole ID From (m) To (m) Length (m) Au g/t

AUDD0001 61 64.05 3.05 3.35

AUDD0003 124.4 132 7.6 2.24

including 127.7 132 4.3 3.36

and 137 141.5 4.5 2.87

AUDD0004 292 301 9 2.91

AUDD0010 43.7 45.2 1.5 6.2

and 237.55 241.9 4.35 2.31

and 261 264 3 7.37

AUDD0013 95.7 97.4 1.7 24.45

including 96 96.3 0.3 122

AUDD0014 147 151.5 4.5 1.75

AUDD0015A 377.5 380.7 3.2 1.77

AUDD0017 167.4 168 0.6 99.35

including 167.4 167.7 0.3 181

AUDD0019 350.15 355 4.85 4.4

and 372 373.6 1.6 19.64

including 372.35 372.85 0.5 59.5

Notes:

• Assaying for the Auteco drill program was completed by AGAT laboratories in Thunder Bay, Ontario.

Prepared 30 g samples were analyzed for gold by lead fusion fire assay with an atomic absorption spectrometry

finish. Samples greater than 5 g/t Au were reassayed by 50 g fire assay with gravimetric finish. All samples

greater than 0.2 g/t Au have additionally been sent for pulp metallics (1000 g) with some results still pending.

Reported intervals for holes AUDD0001 , AUDD0003, AUDD0004 and AUDD0013 do n ot include a ll reassay

results as they are still pending as at the time of this news release.

• Reported widths are drilled core lengths; true widths are unknown at this time

• Cut-off grade of 1 g/t Au allowing for 1 m internal dilution

A complete list of the 2020 drill results to date, including hole details, can be viewed at:

https://www.firstmininggold.com/_resources/news/2020-09-29-FF-NR-Auteco-2020-Drill-Results.pdf

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Vein 5 Extension Discovery

o 1.7 m at 24.5 g/t Au from 95.7 m in AUDD0013 (including 0.6 m at 65.2 g/t Au from 96 m and 0.3

m at 122.0 g/t Au from 96 m)

o 0.6 m at 99.4 g/t Au from 167.4 m in AUDD0017 (including 0.3 m at 181.0 g/t Au from 167.4 m)

A 210 m step-out to the ENE from the current Vein 5 wireframe resulted in the shallow intersection of

1.7 m at 24.5 g/t Au in AUDD0013. Multiple occurrences of visible gold from within the interval provided

encouragement for follow up drilling. A further four holes have now been drilled with assays still pending.

Initial assays have also been returned from AUDD0017, 80 m down dip from AUDD0013, whi ch

intersected grades of up to 181.0 g/t Au within an interval of 0.6 m averaging 99.35 g/t Au.

Mineralization is associated with quartz -tourmaline-gold shear vein in high -strain, sericite -ankerite

altered basalts.

Initial results are highly encouraging, with AUDD0013 and AUDD0017 indicating vertical continuity in the

high-grade vein component of mineralization. Drilling is still wide-spaced (80 m x 80 m) and shallow.

Narrow, high-grade intercepts of up to 0.31 m at 61 g/t Au in hole 1-26-27 have been intersected on

Vein 5 in historical drilling, a further 550 m below the intercept in AUDD0017 (710 m below surface).

Although these intercepts appear narrow the historical drilling only sampled the vein itself, with altered

and mineralized wall rock discarded.

Coupled with historical indications of high-grade gold on the No. 5 vein at depth, Auteco’s drilling

provides encouragement for further step-outs in the drilling both to the ENE and WSW, and points to

further resource potential from the Vein 5 extension target. Vein 5 remains open in all directions.

Vein 11 Extension and 11 Footwall Discovery

o 4.85 m at 4.4 g/t Au from 350.15 m in AUDD0019

o Vein 11 FW: 1.6 m at 19.6 g/t Au from 372 m in AUDD0019 (including 0.5 m at 59.5 g/t Au from

372.35 m)

Hole AUDD0019 was drilled to a depth of 423 m through the Vein 5 extension target. The hole intersected

multiple zones of sub-parallel, high grade mineralization in the footwall of Vein 5.

Vein 11 was intersected with multiple occurrences of visible gold within an interval of 4.85 m at 4.4

g/t Au from 350.15 m. This represents a 120 m step-out from the current Vein 11 resource wireframe

with no historical or recent drilling into the extension target in any direction.

Hole AUDD0019 also intersected multiple 20-30 cm quartz-tourmaline-gold veins at 37 2 m, with initial

assays returning up to 59.5 g/t Au within an interval of 1.6 m at 19.6 g/t Au. This represents a previously

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unrecognized mineralized zone sub-parallel to the trend of Vein 11 outside of current resources.

Mineralization remains open in all directions.

Given the reconnaissance nature of the drilling on the No. 11 Vein extensions and footwall mineralization

to date, this represents an exciting opportunity for the company to delineate additional resources

proximal to existing mine infrastructure.

Vein 112 Target

o 3 m at 7.4 g/t Au from 261 m in AUDD0010

The Vein 112 discovery was intersected in hole AUDD0010 with 3 m at 7.4 g/t Au intersected at 261 m

down hole at the high-strain contact between the mafic volcanics of the Pickle Crow assemblage and the

late basin, Temiskaming type conglomerates. The mineralization is marked by multiple 1 -30 cm quartz-

ankerite-pyrrhotite-pyrite-gold veins, with widespread fuchsite -sericite-ankerite alteration to the

selvedge. Mineralization is open along strike and at depth.

Drill Hole Locations

Hole ID Azimuth ⁰ Dip ⁰ Final Depth (m) UTM East UTM North

AUDD0001 223 -60 114.3 704983 5710808

AUDD0002 200 -60 192 705018 5710874

AUDD0003 199 -58 261 705050 5710908

AUDD0004 200 -60 378 705127 5710888

AUDD0005 205 -59 222 705186 5710974

AUDD0006 200 -60 96.7 705119 5710996

AUDD0007 205 -61 387 705102 5710999

AUDD0008 148 -57 204 704735 5710698

AUDD0009 161 -60 225 704783 5710757

AUDD0010 160 -60 309 704755 5710818

AUDD0011 158 -64 107.97 704743 5710857

AUDD0012 161 -58 71.6 704294 5709842

AUDD0013 175 -61 108 704315 5709573

AUDD0014 305 -56 321.2 705038 5710633

AUDD0015A 282 -60 438 705276 5710822

AUDD0016 180 -61 186 704244 5709543

AUDD0017 174 -61 258 704301 5709629

AUDD0018 174 -58 161.5 704390 5709613

AUDD0019 182 -58 423 704212 5709677

Note: Collar coordinates in UTM NAD 83 z15

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Reconnaissance exploration drilling has also resulted in the identification of three new high -grade gold

discoveries/extensions, with significant step-out mineralization returned from Vein 5 extensions, Vein 11

extensions (including a new footwall discovery), and a new Vein 112.

Additional Details

A map showing the location of Pickle Crow and regionally significant projects can be viewed at:

https://www.firstmininggold.com/_resources/news/2020-09-FF-Pickle-Crow-Regional-Map.pdf

Additional underexplored, mineralized trends within the property and outside of the resource area have

been identified. These areas are currently being subjected to initial geological field assessment by Auteco

field geologists ahead of t he proposed regional exploration drilling which needs to be conducted during

the winter when the target areas are more accessible.

A map showing the identified regional shear zones and walk-up drill targets within the property area can

be viewed at:

https://www.firstmininggold.com/_resources/news/2020-09-FF-Pickle-Crow-Targets.pdf

About Pickle Crow

The Pickle Crow Gold Deposit is a high-grade, shear-hosted, mesothermal Archean lode gold deposit. The

deposit occurs primarily within mafic volcanics and banded iron formation (BIF) units in the Pickle Crow

assemblage of the Pickle Lake Greenstone belt located in the Uchi Lake Sub -province of the Superior

Craton of the Canadian Shield.

Mineralization is focused around steeply north-west dipping, regional scale shear zones. Multiple

mineralization styles have been identified on the property, including Qua rtz-Gold-Tungsten (+/ -

Tourmaline) Shear Veins which are the focus of the current exploration, and banded iron formation

mineralization (BIF-style), which comprises structurally-controlled, sheeted vein arrays hosted within the

BIF.

Pickle Crow is one of Canada’s highest-grade historical gold mines. It operated from 1935 until 1966,

during which time it reportedly produced almost 1.5 million ounces of gold at an average grade of 16.14

g/t. The property consists of ~190 km2 (19,000 hectares) of tenure covering a major gold province. Auteco

recently increased its landholding near the Project by staking an additional 130 km 2 (13,000 ha) of land

contiguous to Pickle Crow, thereby increasing the combined property’s land package to over 320 km 2

(32,000 ha) (see news release dated February 18th, 2020). First Mining acquired the Project in November

2015 through its acquisition of PC Gold Inc.

Auteco’s development focus is on returning to first principles, completing a new geological review and

applying modern exploration technologies in their advancement of the Project. Auteco has a strong focus

on discovering and developing new project scale, high-grade, near surface gold resources.

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QA/QC Procedures

The QA/QC program for the Auteco drill program consists of the submission of duplicate samples and the

insertion of Certified Reference Materials (CRMs), including low, medium and high -grade standards and

coarse blanks, at regular intervals in the sample stream . One set of the four QA/QC sampl e types were

inserted every 25 samples, consisting of 1 coarse duplicate, 1 quarter-split field duplicate, 1 CRM (altering

between low, medium and high standards) and 1 blank. AGAT lab oratories also undertakes its own

internal QAQC program to ensure proper sample preparation and equipment calibration.

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

Inc. who are advancing the Goliath-Goldlund gold projects 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 NI 43-101 and is available at www.sedar.com under First Mining’s SEDAR profile.

Readers are cautioned that the PEA is preliminary in nature, it includes inferred mineral resources that are

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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. For ward-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 th ereof 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 fut ure 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 the coming weeks; (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 Auteco’s current drill program; (v) the potential for further step-out drilling at Pickle Crow; (vi) timing

for the completion of a Pre-Feasibility Study for Springpole; (vii) timing for the submission of 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. The re 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 d ate 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 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, su ch as COVID -19, that may result in a slowdown or

temporary suspension of operations at some or all of the Company's mineral properties as well as its head

office; fluctuations in the spot and forward price of gold, silver, base metals or certain other comm odities;

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.

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

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

to update any forward -looking stat ement, 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 securit ies 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 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 sci entific 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 in formation 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 c autioned 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 g reat 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 resou rce 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.