FF.TO · 2018-08-20 12:00:00

First Mining Intersects 2.44 G/T GOLD over 108 Metres 10KMS Northeast of Current Resource Area

Drill Results

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FIRST MINING INTERSECTS 2.44 G/T GOLD OVER 108 METRES 10KMS NORTHEAST OF

CURRENT RESOURCE AREA

August 20, 2018

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

is pleased to announce initial fire assay results from a regional exploration drilling program,

currently underway at the Company’s wholly-owned Goldlund Gold Property (“Goldlund”) in

northwestern Ontario, Canada.

Drilling Highlights:

 Hole MI-18-001 intersected 107.6 metres (“m”) of 0.33 grams per tonne gold (“g/t Au”)

o including 11.0 m of 1.17 g/t Au

 Hole MI-18-002 intersected 142.1 m of 1.90 g/t Au

o including 108.0 m of 2.44 g/t Au, and 31.0 m of 4.44 g/t Au

o and including 7.0 m of 14.67 g/t Au

 Hole MI-18-003 intersected 48.0 m of 1.07 g/t Au

o including 15.0 m of 1.41 g/t Au

 Hole MI-18-004 intersected 23.8 m of 0.54 g/t Au

o including 5.80 m of 1.40 g/t Au

 Hole MI-18-005 intersected 10.0 m of 0.43 g/t Au

o and 1.0 m of 4.18 g/t Au

 Hole MI-18-006 intersected 22.0 m of 0.69 g/t Au

o including 6.40 m of 2.09 g/t Au and 0.38 m of 21.66 g/t Au

Note: Assaying for the Miller and Eaglelund drill programs are being done by SGS Canada Inc. (“SGS”) at their

laboratories in Red Lake and Cochrane, ON. Reported widths are drilled core lengths; true widths are unknown at this

time. Assay values are uncut.

Jeff Swinoga, President and Chief Executive Officer of First Mining, stated, “Th is discovery of

significant gold mineralization over such lengths and depths at the Miller prospect is a striking

success on its own. However, of much greater significance to the big ger picture at Goldlund, is

that today’s results confirm the presence of Gol dlund-style mineralization approximately 10

kilometres from the current resource area along strike of this 50 kilometre long property and

indicate the near-term exploration potential to expand the Goldlund resource. Of the eight drill

holes, seven had occurrences of visible gold.”

This is the Company’s first drill program to test the regional potential of the Goldlund property to

host significant gold mineralization similar to that demonstrated within the Goldlund resource

area. Today’s results are from the first six drill holes of a planned thirteen hole diamond drill

program at the Miller and Eaglelund prospect areas (See Figure 1 below).

Figure 1: Location Map Showing Miller and Eaglelund Exploration Areas

(1) Based on a technical report titled “Technical Report and Resource Estimation Update on the Goldlund Project”

dated February 7, 2017, which was prepared by WSP Canada Inc. in accordance with NI 43-101 and which is available

under the Company’s SEDAR profile at www.sedar.com, and on the Company’s website at www.firstmininggold.com.

The two targeted areas lie approximately 10 kilometres northeast of the Goldlund resource area,

along strike of the lithologic fabric of granodiorite sills/dykes intruded into regional mafic meta-

volcanic greenstone which extends over 30 kilometres within the Goldlund property boundary .

This elongate pattern of brittle granodiorite in ductile mafic meta-volcanic rocks is a key

mechanism in focusing gold mineralization, as demonstrated in the area of the current Goldlund

resource. The pattern of granodiorite sills/dykes hosted in mafic meta-volcanic can be observed

in the geophysical map presented below in Figure 2.

Figure 2: Geophysics Map ( calculated with vertical gradient magnetics northeast of the

Goldlund resource area)

A total of eight drill holes were planned and completed at Miller while five drill holes are planned

at Eaglelund and the first drill hole is currently underway (Figure 3 below).

Figure 3: Drill Plan Map Showing Miller and Eaglelund Prospects (projections to surface)

Figure 4: Cross Section (looking Northeast at Miller Prospect)

The drilling results at Miller confirm ed the same mineralogical associations of gold present in

quartz-carbonate-sulphide stockwork v eining in granodiorite which is very similar to that

observed at the Goldlund resource area.

While it is too early yet to draw strong conclusions, some differences with the Goldlund resource

area have been observed at Miller:

 At Miller, the four drill holes which crosscut the granodiorite from hangingwall to footwall

indicate that the entire width of the dyke appears receptive to gold mineralization ,

while at the Goldlund resource area, gold mineralization tends to occupy only 25% - 40%

of the total dyke width, generally favouring the footwall side.

 In addition, while visible gold ( “VG”) and gold tellurides were common in First Mining ’s

2017-2018 infill drilling program at the Goldlund resource area , the frequency of

occurrence of VG at Miller was much greater, with VG occurring in seven out of the total

eight holes.

The occurrence of VG in the Miller drill holes is summarized in Table 1 below:

Table 1: Occurrences of Visible Gold (VG) at Miller Prospect

Drillhole Logged From To Au g/t

ID Observation (m) (m) Sample ID (Fire Assay)

MI-18-001 (VG observed) 18 18.3 C00054021 8.588

MI-18-001 (VG observed) 27.3 27.6 C00054034 8.670

MI-18-002 (VG observed) 5.5 6 C00054174 1.903

MI-18-002 (VG observed) 6 6.5 C00054175 11.880

MI-18-002 (VG observed) 122 122.5 C00054316 2.320

MI-18-002 (VG observed) 133 133.5 C00054330 0.585

MI-18-003 (VG observed) 69 69.5 C00054423 2.362

MI-18-003 (VG observed) 71 71.5 C00054426 2.964

MI-18-003 (VG observed) 90 90.5 C00054450 17.230

MI-18-003 (VG observed) 94.5 95 C00054457 1.344

MI-18-003 (VG observed) 97 97.5 C00054461 3.862

MI-18-003 (VG observed) 109.5 110 C00054479 0.007

MI-18-003 (VG observed) 124.5 125 C00054499 0.315

MI-18-003 (VG observed) 125 125.5 C00054500 10.550

MI-18-003 (VG observed) 125.5 126 C00054501 0.842

MI-18-003 (VG observed) 129.5 130 C00054507 4.391

MI-18-003 (VG observed) 137.7 138 C00054517 9.865

MI-18-004 (No VG)

MI-18-005 (VG observed) 71 72 C00054657 0.768

MI-18-006 (VG observed) 103.62 104 C00054751 21.660

MI-18-006 (VG observed) 109 109.4 C00054759 4.690

MI-18-007 (VG observed) 94 94.5 C00054891 Assays Pending

MI-18-007 (VG observed) 94.5 95 C00054892 Assays Pending

MI-18-007 (VG observed) 101 101.5 C00054901 Assays Pending

MI-18-007 (VG observed) 107 107.5 C00054911 Assays Pending

MI-18-007 (VG observed) 107.5 108 C00054912 Assays Pending

MI-18-007 (VG observed) 114 114.5 C00054925 Assays Pending

MI-18-007 (VG observed) 132.5 133 C00054949 Assays Pending

MI-18-008 (VG observed) 136 136.5 C00055084 Assays Pending

MI-18-008 (VG observed) 137.5 138 C00055087 Assays Pending

Figure 5 below presents a mosaic of nine photomicrograph images taken of some of the

occurrences listed above. Drill hole ID, magnification and depth are noted in each image.

Figure 5: Photomicrograph Mosaic of VG Observed in Miller Prospect Core

Sawn core s amples were submitted to SGS (Red Lake , Ontario) for initial 50 gram fire assay

with AAS finish. Au detection over-limits (>10 g/t) are automatically re-assayed with gravimetric

finish.

Given the frequent occurrence of visible gold in the Miller drill holes, First Mining is following up

their standard fire assays with a more definitive assay protocol of metallic screen fire assay using

a 1,000 gram sample size to minimize the high nugget effect characteristic of Goldlund

mineralization. Metallic screen fire assays will be completed at the SGS Red Lake and Cochrane

laboratories on all sample intervals where VG has been observed, as well as selected sample

intervals immediately adjacent to VG.

The 2018 regional exploration drilling campaign at Goldlund is designed to test the presence and

character of potential gold mineralization distal from the current resource area.

Table 2. Drill Hole Assay Results from the Miller Prospect

Hole ID From (m) To (m) Length

(m) Au g/t

MI-18-001

MI-18-001 7.0 114.6 107.6 0.33

inc 15.0 88.6 73.6 0.41

inc 16.0 18.3 2.3 1.93

and inc 18.0 18.3 0.3 8.59

and inc 23.3 29.6 6.3 0.91

and inc 27.3 27.6 0.3 8.67

and inc 77.6 88.6 11.0 1.17

and inc 87.6 88.6 1.0 6.27

MI-18-002

MI-18-002 0.4 142.5 142.1 1.90

inc 1.5 109.5 108.0 2.44

and inc 57.5 88.5 31.0 4.44

and inc 75.5 82.5 7.0 14.67

and inc 81.5 82.5 1.0 88.80

and inc 102.5 109.5 7.0 9.60

and inc 108.5 109.5 1.0 54.47

MI-18-003

MI-18-003 69.0 72.0 3.0 1.12

and 90.0 138.0 48.0 1.07

inc 90.00 90.5 0.50 17.23

and inc 94.00 97.5 3.50 2.28

and inc 105.0 106.0 1.00 3.90

and inc 115.0 130.0 15.0 1.41

and inc 125.00 125.5 0.50 10.55

and inc 137.70 138.0 0.30 9.87

MI-18-004

MI-18-004 34.0 57.8 23.8 0.54

inc 34.0 35.0 1.00 2.56

and inc 52.0 57.8 5.80 1.40

and inc 55.0 56.0 1.00 6.12

MI-18-005 MI-18-005 46.0 47.0 1.00 4.18

and 68.0 78.0 10.00 0.43

Hole ID From (m) To (m) Length

(m) Au g/t

and inc 72.0 74.0 2.00 1.25

and 109.0 110.0 1.00 1.00

MI-18-006

MI-18-006 76.0 77.0 1.0 1.38

and 102.0 124.0 22.00 0.69

inc 103.0 109.4 6.40 2.09

and inc 103.6 104.0 0.38 21.66

and inc 109.0 109.4 0.40 4.69

and 145.0 147.0 2.00 1.48

and 169.0 170.0 1.00 3.01

Assaying for the 2018 Regional Goldlund drill programs are being done by SGS at their laboratories in

Red Lake, Ontario. Prepared samples are analyzed for gold by lead fusion fire assay with an atomic

absorption spectrometry (AAS) finis h, with metallic screen fire assays being run on selected s amples.

Multi-element analysis on the mineralized zones is also being undertaken by two-acid aqua regia digestion

with ICP-MS and AES.

Table 3. Drill Hole Locations for the Miller Prospect

Hole ID Azimuth ° Dip ° Length (m) UTM East UTM North Section

MI-18-001 140 -80 140.5 554524 5533531 NW-50

MI-18-002 140 -85 200.0 554538 5533558 NW-100

MI-18-003 140 -55 170.0 554523 5533608 NW-100

MI-18-004 140 -55 101.0 554457 5533534 NW-00

MI-18-005 320 -65 110.0 554486 5533462 NW-00

MI-18-006 320 -65 170.0 554534 5533482 NW-50

MI-18-007 320 -60 182.0 554619 5533527 NW-150

MI-18-008 315 -60 172.8 554630 5533563 NW-150

QA/QC Procedures

The QA/QC program for the 2018 regional drilling programs at Miller and Eaglelund 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 samples (3% of total). The standards used in the 2018 regional

program consist of 5 different gold grades ranging from 1 to 9 g/t Au, 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 duplicates. Additional selected duplicates

are being submitted 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.

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