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First Mining Announces Further Drilling Results from the 2017-2018 Drill Program at Its Goldlund GOLD Project

Drill Results

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FIRST MINING ANNOUNCES FURTHER DRILLING RESULTS

FROM THE 2017-2018 DRILL PROGRAM AT ITS GOLDLUND GOLD PROJECT

May 15, 2018

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

is pleased to announce this fourth set of Phase 2 infill drilling results, comprising 11 drill holes,

from its diamond drill program within Zone 1 (see Tables 1 and 2) at First Mining’s 100% owned

Goldlund Gold Project (“Goldlund”), located near the town of Sioux Lookout in northwestern

Ontario, Canada.

The Company is now planning to move forward with the next phase of its 2018 exploration

programs, which will include mapping, sampling and drilling of the northeastern and

southwestern extents of the known strike lengt h on the Goldlund property. This summer, First

Mining plans to conduct an exploration drill campaign in these areas of approximately 14 holes

for 2,000 metres of diamond drilling.

Jeff Swinoga, President and Chief Executive Officer of First Mining, stated, “These latest drill

holes complete the 16,000 metre Phase 2 infill drilling campaign designed to provide greater

confidence in the gold mineralization within Zone 1 at Goldlund. During this phase, 33 of 38

holes intersected gold mineralization and the drilling was confined to a strike length of only 2 to

3 kilometres, whereas the total strike length of the Goldlund property is estima ted to be

approximately 50 kilometres. We are very excited to proceed with our next phase of exploration

drilling on several highly prospective and underexplored areas along the strike length of the

Goldlund property and outside of the known resource area.”

The 11 drill hole results (Figure 1) presented in this news release represent the final round of

infill holes which targeted gold mineralization in Zone 1 . All 11 holes encountered gold

mineralization. As with some of the other previously reported holes targeting Zone 1, these holes

were positioned to avoid intersecting several levels of historic underground workings from

previously mined areas of Zone 1 . Accordingly, we believe some of the holes may not have

reached the key mineralized zones which occur closer to the footwall of the zone.

The 2017/2018 drilling campaigns at Goldlund have b een designed to accomplish four primary

objectives:

 Convert Inferred Mineral Resources within the resource area (Zones 1, 5 and 7) into the

Indicated Mineral resource category;

 Test drill deeper exploration targets within Zone 7;

 Identify and add additional mineralization within areas that are adjacent to the current

resource boundary; and

 Test drill additional exploration targets within other areas (outside of the current resource

boundary) within the Goldlund Gold Property.

Gold observed during the current drilling program at Goldlund occurs both as fine disseminations

in quartz vein stockworks and as more discrete larger grains up to 2 mm spatially associated

with pyrite in the quartz veins. Calaverite, a gold telluride mineral, has been noted occasionally

in higher grade intervals on fracture surfaces in the quartz veins. Higher grade gold distribution

in the granodiorite dike is often, but not always, associated with zones of more intense quartz

stockworking and potassic alteration. Figure 2 below displays a cross -section of the geology

and gold mineralization for drill holes GL-17-117, GL-17-139 and GL-18-140 (results reported in

the Company’s previous news releases dated February 8, 2018 and April 17, 2018), plus GL-18-

141, GL-18-142 and GL-18-143.

Table 1. Drill Hole Assay Results from Goldlund

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

GL-18-141

GL-18-141 316.0 352.0 36.0 0.71

inc 320.0 322.0 2.0 1.11

and inc 332.0 334.0 2.0 4.13

and inc 344.0 346.0 2.0 1.24

and inc 350.0 352.0 2.0 2.87

and 372.0 410.0 38.0 0.29

inc 372.0 374.0 2.0 1.33

GL-18-142 GL-18-142 126.0 136.0 10.0 0.59

inc 134.0 136.0 2.0 1.92

GL-18-143

GL-18-143 286.0 288.0 2.0 1.94

and 324.0 326.0 2.0 1.84

and 358.0 426.0 68.0 0.28

inc 386.0 388.0 2.0 2.27

and inc 408.0 410.0 2.0 1.04

and inc 424.0 426.0 2.0 1.84

GL-18-144

GL-18-144 7.18 47.0 39.82 0.55

inc 7.18 9.0 1.82 3.89

and inc 23.0 29.0 6.0 1.20

and 191.0 231.0 40.0 0.28

and inc 221.0 223.0 2.0 2.50

GL-18-145

GL-18-145 112.0 134.0 22.0 0.28

inc 112.0 114.0 2.0 1.05

and 234.0 246.0 12.0 0.23

GL-18-146

GL-18-146 11.0 19.0 8.0 0.78

inc 17.0 19.0 2.0 1.43

and 155.0 161.0 6.0 1.04

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

inc 155.0 157.0 2.0 2.81

and 175.0 205.0 30.0 0.27

inc 195.0 201.0 6.0 0.50

and 227.0 229.0 2.0 1.70

GL-18-147 GL-18-147 100.0 156.0 56.0 0.18

inc 138.0 140.0 2.0 2.89

GL-18-148

GL-18-148 14.0 16.0 2.0 1.06

and 110.0 206.0 96.0 0.43

inc 110.0 112.0 2.0 1.09

and inc 126.0 128.0 2.0 1.38

and inc 150.0 156.0 6.0 0.99

and inc 184.0 196.0 12.0 0.90

and inc 204.0 206.0 2.0 1.03

GL-18-149

GL-18-149 48.0 72.0 24.0 0.54

inc 52.0 60.0 8.0 0.99

and inc 70.0 72.0 2.0 1.18

GL-18-150

GL-18-150 4.0 26.0 22.0 0.35

inc 14.0 16.0 2.0 1.08

and inc 18.0 20.0 2.0 1.54

and 162.0 200.0 38.0 0.28

inc 162.0 164.0 2.0 2.24

GL-18-151 GL-18-151 106.0 124.0 18.0 0.50

inc 108.0 110.0 2.0 3.08

Assaying for the 2017/2018 Goldlund drill programs is being done by SGS at their laboratories in Red Lake, Ontario and Burnaby,

BC. Prepared samples are analyzed for gold by either Bulk Leach Extractable Gold (BLEG) assay techniques or by lead fusion f ire

assay with an atomic absorption spectrometry (AAS) finish. Multi-element analysis on the mineralized zones is also being undertaken

by two-acid aqua regia digestion with ICP-MS and AES finish.

Figure 1. Plan Map

Table 2. Drill Hole Locations

Hole ID Azimuth ° Dip ° Final Depth

(m) UTM East UTM North Section

GL-18-141 0 -90 410 547100 5527430 547100E

GL-18-142 0 -90 290 547150 5527500 547150E

GL-18-143 0 -90 449 547150 5527480 547150E

GL-18-144 0 -90 335 547200 5527540 547200E

GL-18-145 0 -90 359 547200 5527520 547200E

GL-18-146 0 -90 305 547250 5527560 547250E

GL-18-147 0 -90 371 547250 5527540 547250E

GL-18-148 0 -90 251 547300 5527590 547300E

GL-18-149 0 -90 302 547300 5527570 547300E

GL-18-150 0 -90 200 547350 5527610 547350E

GL-18-151 0 -90 251 547350 5527590 547350E

Figure 2. Cross-Section through the Goldlund Project

QA/QC Procedures

The QA/QC program for the 2017/2018 drilling programs at Goldlund consists of the submission

of duplicate samples and the insertion of certified reference materials and blanks at regular

intervals. These are inserted at a rate of one standard for every 20 samples (5% of total) and

one blank for every 30 sam ples (3% of total). The standards used in the 2017 /2018 program

consist of 5 different gold grades ranging from 1 to 9 g/t, and are sourced from CDN Resource

Laboratories in Langley, BC. Blanks have been sourced locally from barren granitic material.

Field duplicates from quartered core, as well as ‘coarse’ or ‘pulp’ duplicates taken from coarse

reject material or pulverized splits, are also submitted at regular intervals with an insertion rate

of 4% for field duplicates and 4% for coarse or pulp duplica tes. Additional selected duplicates

are being submitted for screened metallic fire assay analysis and to an umpire lab for check

assaying. SGS also undertake their own internal coarse and pulp duplicate analysis to ensure

proper sample preparation and equipment calibration.

Dr. Chris Osterman, P.Geo., CO O of First Mining, is the “qualified person” for the purposes of

National Instrument 43 -101 Standards of Disclosure for Mineral Projects (“NI 43-101”) and he

has reviewed and approved the scientific and technical disclosure contained in this news release.

ABOUT THE GOLDLUND PROJECT

The Goldlund deposit is situated within a land package of approximatel y 280 square kilometres

(28,000 hectares) referred to as the Goldlund Gold Project. The Property has a st rike-length of

over 50 kilometres in the Wabigoon Subprovince. Goldlund is an Archean lode -gold project

located in northwestern Ontario, approximately 60 kilometres from the township of Dryden. The

claims that make up the land package cover the historic Goldlund and Windward mines.

On January 9, 2017, the Company announced an initial mineral resource estimate for Goldlund

that was prepared by WSP Canada Inc. in accordance with NI 43 -101. At a 0.4 g/t Au cut -off

grade, the Goldlund deposit contains pit c onstrained Indicated Mineral Resources of 9.3 million

tonnes at 1.87 g/t gold, or 560,000 ounces of gold. At a 0.4 g/t gold cut-off grade, the Goldlund

deposit contains pit constrained Inferred Mineral Resources of 40.9 million tonnes at 1.33 g/t

gold, or 1,750,000 ounces of gold. The technical report for this resource estimate, which is titled

“Technical Report and Resource Estimation Update on the Goldlund Project” and is dated

February 7, 2017, is available under the Company’s SEDAR profile at www.sedar.com, and is

also available on the Company’s website at www.firstmininggold.com.

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 million ounces of

gold in the Measured and Indicated categories and 5 million ounces 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.

For further informati on, please contact Jeff Swinoga, President and CEO at 604-639-8854, or

Derek Iwanaka, Vice President of Investor Relations at 604 -639-8824, or visit our website at

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 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 estimated amount and grade of Mineral Resources at

Goldlund; (ii) future exploration activities by First Mining on other regional targets on the Goldlund property

that are outside the current resource boundary; (iii) the potential for exploration upside at Goldlund ; (iv)

the Company’s plans to conduct a step-out drill campaign consisting of 14 holes for 2,000 metres of

diamond drilling in the northeastern and southwestern extents of the known strike length on the Goldlund

property areas; and (v) the Company moving forward with the next phase of its 2018 exploration program.

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 abo ve, but generally these assumptions include: (i) the presence of and

continuity of metals at Goldlund at estimated grades; (ii) the capacities and durability of various machinery

and equipment; and (iii) success in realizing proposed drilling programs. Al though 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 future 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 variations in the mineral content within the

material identified as Mineral Resources from that predicted; (ii) general risks related to exploration drilling

programs; (iii) developments in world metals markets; (iv) risks relating to fluctuations in the Canadian

dollar relative to the US dollar; (v) management’s discretion to refocus the Company’s exploration efforts

and/or alter the Company’s short and long term business plans; and (vi) the additional risks described in

First Mining's Annual Information Form for the year ended December 31, 201 7 filed with the Canadi an

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 potentia l 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 otherwise indicated, all

resource and reserve estimates included in this news rel ease 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, 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 scientific and technical 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 mineralizat ion 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 Cana dian 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.