Iamgold Reports High Grade Drill Intersections from Drill Program at the Karita GOLD Project IN Guinea, WEST Africa

NEWS RELEASE TSX: IMG NYSE: IAG

IAMGOLD REPORTS HIGH GRADE DRILL INTERSECTIONS FROM DRILL

PROGRAM AT THE KARITA GOLD PROJECT IN GUINEA, WEST AFRICA

Toronto, Ontario, July 6, 2022 – IAMGOLD Corporation (NYSE:IAG) (TSX:IMG) (“IAMGOLD” or the

“Company”) is pleased to announce assay results from its 2022 delineation diamond drilling program on its wholly-

owned Karita Gold project in north-eastern Guinea. The project is located along the prolific Senegal -Mali Shear

Zone in West Africa, between the Company’s Boto Gold Project in Senegal eight (8) kilometres to the north, and

its Diakha-Siribaya Gold project in Mali three (3) kilometres to the south.

Highlights include (refer to Table 1 for detailed interval results):

• 34.0 metres (“m”) at 5.81 grams per tonne gold (“g/t Au”) in drill hole KDD22-006 from 67.0 m

o including 5.0 m at 33.31 g/t Au from 70.0 m,

- followed by a separate interval of 14.15 m at 6.46 g/t Au from 197.9 m

o including 3.0 m at 28.73 g/t Au from 203 m;

• 50.0 m at 2.85 g/t Au in drill hole KDD22-003 from 21.0 m

o including 7.0 m at 13.47 g/t Au from 36.0 m;

• 25.0 m at 5.32 g/t Au in drill hole KDD22-033 from 26.0 m

o including 14.0 m at 9.10 g/t Au from 26.0 m,

- followed by a separate interval of 32.0 m at 1.66 g/t Au from 51.0 m

o including 2.0 m at 13.14 g/t Au from 68.0 m,

- followed by a separate interval of 21.0 m at 1.9 g/t Au from 156.0 m;

• 37.0 m at 3.50 g/t Au in drill hole KDD22-007 from 98.0 m

o including 6.0 m at 7.46 g/t Au from 116.0 m;

• 22.0 m at 5.70 g/t Au in drill hole KDD22-028 from 11.0 m

o including 3.0 m at 31.13 g/t Au from 19.0 m;

• 12.0 m at 9.49 g/t Au in drill hole KDD22-016 from 129.0 m

o including 6.0 m at 17.95 g/t Au from 129.0 m;

• 21.0 m at 5.33 g/t Au in drill hole KDD22-015 from 25.0 m

o including 6.0 m at 7.42 g/t Au from 25.0 m

o including 7.0 m at 9.11 g/t Au from 39.0 m;

• 21.0 m at 2.71 g/t Au in drill hole KDD22-013 from 73.0 m

o including 7.0 m at 5.15 g/t Au from 80.0 m,

- followed by a separate interval of 20.0 m at 5.33 g/t Au from 104.0 m

o including 7.0 m at 8.80 g/t Au from 104.0 m

o including 3.0 m at 11.97 g/t Au from 115.0 m;

• 18.0 m at 4.29 g/t Au in drill hole KDD22-030 from 45.0 m

o including 6.0 m at 9.83 g/t Au from 48.0 m

o including 2.0 m at 8.32 g/t Au from 61.0 m;

• 40.0 m at 1.84 g/t Au in drill hole KDD-010 from 159.0 m

o including 7.0 m at 5.15 g/t Au from 159.0 m

o including 4.0 m at 6.63 g/t Au from 188.0 m;

• 20.0 m at 3.32 g/t Au in drill hole KDD-019 from 60.0 m

o including 6.0 m at 9.03 g/t Au from 60.0 m;

Page | 2 of 10

Craig MacDougall, Executive Vice President, Growth for IAMGOLD, stated: "The results reported today from our

ongoing delineation drilling program are highly encouraging and continue to build on our exploration successes in

the region. Karita is located on the Senegal –Mali Shear Zone which extends from B2Gold’s Fekola mine 15

kilometres to the north though our previous discoveries at the Boto and Diakha-Siribaya projects to the south .

During this program we have intersected multiple, wide zones of mineralization within altered metasedimentary

units, several of which include considerable thickness in the shallow oxidized zone, extending nearly 2 kilometres

along strike . We would like to recognize th e efforts of our exploration team in West Africa , who have worked

tirelessly against many logistical challenges to safely implement this drilling program as they advance our

evaluation of our newest discovery.”

The assay results returned represent 42 diamond drill holes (“DDH”) totaling 10,230.5 metres from the ongoing

2022 delineation drilling program, which will involve the completion of 22,000 to 24,000 metres of drilling, designed

to delineate the mineralized zones on a nominal 100 x 50 metre collar spacing in order to support a future initial

mineral resource estimate. To date, approximately 18,225 metres in 70 DDH holes have been completed.

Additional assay results will be reported once they are received, validated and compiled.

Figure 1 – Karita Drill Hole Plan View

Page | 3 of 10

Figure 2 – Cross Section View L 2200N

Note: Drill hole intercepts are calculated with a lower cut -off grade of 0.3 g/t Au and may contain lower grade intervals of

up to 5 meters in core length

Next Steps

Approximately 4,000 to 6,000 metres of additional drilling is planned in the second half of the year as part of t he

2022 delineation drilling program. The results of the drilling program will be compiled, validated and interpreted to

develop a deposit model to support the completion of an initial mineral resource estimate planned for 2023.

The Karita Gold Project

The Karita Gold project is wholly -owned by IAMGOLD and is held under an exploration permit that covers

approximately 100 square kilometres in Guinea, on the Birimian aged Kédougou-Kéniéba inlier of the West African

Craton region along the borders with Senegal, Guinea and Mali.

In 2017, the Company completed a reconnaissance geology and termite mound geochemical sampling program

over the Karita permit to evalu ate the interpreted extension of the Boto -Diakha mineralized trend in Guinea. The

area is thought to cover an extension of the regionally important and prolific Senegal-Mali Shear Zone along trend

between IAMGOLD’s Boto Gold deposits in Senegal to the nort h, and its Diakha deposit on the Siribaya project

in Mali to the south. The sampling program identified an extensive gold geochemical anomaly delineated over a

nearly 2 kilometre strike length, and similar to that observed to be associated with the deposit s occurring at both

Boto and Diakha.

Page | 4 of 10

Figure 3 – Senegal-Mali Shear Zone

The initial 2019 drilling program was designed to evaluate the geochemical anomaly for the presence of

mineralization and involved the completion of wide spaced lines of reverse circulation (“ RC”) drilling, which

confirmed the presence of multiple zones of mineralization hosted within an albite + hematite altered sandstone

metasedimentary unit over a 1.6 kilometre strike length.

After extensive access restrictions arising from the global COVID-19 pandemic, exploration resumed in 2022 with

the objective of delineating this new discovery to evaluate its resource potential. Results to date have confirmed

the presence of shallow oxide mineralization extending at depth to fresh rock where mineralization is observed to

be hosted in altered and locally brecciated metasedimentary lithologies exhibiting albite – silica – hematite

alteration associated with disseminated to locally narrow semi -massive sulphide (pyrite) veins and occasional

visible gold. Overall, the mineralization shows similarities to IAMGOLD’s Boto and Diakha deposits located along

the same trend.

Page | 5 of 10

Table 1 – 2022 Diamond Drilling Program – Karita Gold Project, Guinea

UTM WGS84/Zone29 AZ Dip EOH From To Core

Length Gold2 Mineralized

Zones HOLE-ID Easting Northing Elevation (°) (°) (m) (m) (m) (m) (g/t)

KDD22-001 240772.3 1372899 166.8 90 -54 315 0 3 3 0.66 Oxide zone

77 84 7 1.87

94 109 15 0.71

Sulfide zone Including 94 100 6 1.29

132 137 5 3.74

210 214 4 0.51

KDD22-002 240572.3 1372200 178.8 90 -55 350.5 86 139 53 1.88

Sulfide Zone Including 86 95 9 3.9

Including 100 111 11 3.53

115 139 24 1.04

KDD22-003 240672.3 1372199 176.4 90 -55 326 21 71 50 2.85 Oxide zone

Including 36 43 7 13.47

84 87 3 2.72

Sulfide zone 145 148 3 3.99

178 181 3 0.55

189 196 7 0.34

KDD22-004 240875.6 1372900 169.1 90 -54 247 0 6 6 1.06 Oxide zone

17 19 2 1.11

96 100 4 2.03 Sulfide zone

127 131 4 0.56

KDD22-005 240926.4 1372901 170.1 90 -54 190 0 13 13 1.05

Oxide zone 30 31 1 29.7

44 66 22 1.81

Including 51 54 3 7.06

KDD22-006 240623.8 1372199 177.7 90 -55 354 39 51 12 0.95

Oxide zone 62 67 5 1.16

67 101 34 5.81

Sulfide zone

Including 70 75 5 33.31

197.9 212 14.1 6.46

Including 203 206 3 28.73

338 340 2 1.82

KDD22-007 240723.9 1372199 175.8 90 -55 300 51 69 18 0.65 Oxide zone

98 135 37 3.5

Sulfide zone Including 116 122 6 7.46

249 255 6 0.63

KDD22-008 240775 1372199 175 90 -55 250 32 43 11 0.43

Oxide zone 50 68 18 2.72

Including 62 66 4 6.57

KDD22-009 240826.1 1372900 167.9 90 -53 276 0 6 6 0.6

Oxide zone 19 31 12 1.5

61 63 2 0.79

KDD22-010 240517.8 1372200 179.8 90 -55 351 100 105 5 1

Sulfide zone

159 199 40 1.84

Including 159 166 7 5.15

Including 188 192 4 6.63

203 205 0.73

KDD22-011 240824.9 1372199 174.3 90 -55 160 19 27 8 2.89 Oxide zone

56 62 6 0.63 Sulfide zone

67 73 6 0.6

KDD22-012 240722.5 1372899 166.7 90 -54 300 112 113 1 3.15 Sulfide zone

145 148 3 1.33

Page | 6 of 10

257 259 2 1.28

KDD22-013 240628.3 1372302 177.5 90 -54 275 38 46 8 0.38 Oxide zone

53 58 5 0.32

73 94 21 2.71

Sulfide zone

Including 80 88 7 5.15

104 124 20 5.33

Including 104 111 7 8.8

Including 115 118 3 11.97

131 135 4 1.82

142 145 3 1.49

197 207 10 0.6

Including 202 204 2 1.64

223 235 12 0.75

KDD22-014 240589.1 1372102 178.3 90 -54 300 75 87 12 0.94

Oxide zone Including 75 77 2 1.8

Including 82 87 5 1.43

91.4 101 9.6 0.97

Sulfide zone

153 159 6 6.52

Including 153 155 2 9.24

Including 157 159 2 10.09

250 252 2 2.43

KDD22-015 240708.8 1372302 176 90 -54 225 25 46 21 5.33

Oxide zone Including 25 31 6 7.42

Including 39 46 7 9.11

76 78 2 5.82

Sulfide zone

85.5 88 2.5 1.17

99 102.1 3.1 1.4

135 141 6 3.31

136 139 3 6.06

162 172 10 0.51

KDD22-016 240670 1372101 176.3 90 -54 250 24 27 3 0.44 Oxide zone

54 55 1 109.9

129 141 12 9.49

Sulfide zone Including 129 135 6 17.95

149 155 6 3.21

172 175 3 0.58

KDD22-017 240700.4 1372700 173.8 90 -54 312 14 35 21 1.19 Oxide zone

Including 15 18 3 5.62

83 85 2 1.68

Sulfide zone 115 117 2 0.73

154 156 2 3.12

215 220 5 1.06

KDD22-018 240789.6 1372301 174.2 90 -54 150 28 30 2 6.82 Oxide zone

63 81 18 1.02 Sulfide zone

KDD22-019 240748.9 1372101 174.9 90 -54 172 60 80 20 3.32 Oxide zone

Including 60 66 6 9.03

125 132 7 0.85 Sulfide zone

KDD22-020 240686.1 1372500 177.7 90 -54 275 18 29 11 1.86 Oxide zone

Including 25 26 1 17.4

77 81 4 1.1

Sulfide zone 99 103 4 2.2

123 130 7 5.16

Including 123 125 2 16.58

KDD22-021 240766 1372500 176 90 -54 243 26 32 6 10.98 Oxide Zone

KDD22-022 240847.8 1372500 175.1 90 -54 174 40 46 6 1.22 Oxide zone

Page | 7 of 10

61 67 6 1.03 Sulfide zone

KDD22-0023 240780 1372700 176 90 -54 252 35 44 9 0.86 Oxide zone

62 68 6 0.6 Sulfide zone

73 78 1.26

KDD22-024 240860.3 1372700 178.5 31 45 14 2.3 Oxide zone

Including 31 34 3 6.42

128 130 2 1.52 Sulfide zone

KDD22-025 240620 1372700 174 90 -54 303 158 169 11 0.61

Sulfide zone

213 215 2 2.26

252 269 17 1.42

Including 252 257 5 2.97

Including 265 268 3 3.24

KDD22-026 240606 1372500 178 90 -54 276 71.6 77.9 6.3 0.63

Sulfide zone

102 106 4 12.9

Including 103 106 3 17.04

157 170 13 0.47

198 208 10 12.02

Including 205.1 206 0.9 119.3

KDD22-027 240646 1372500 178 90 -54 275 94 105 11 0.92

Sulfide Zone Including 102.4 104.2 1.8 3.68

171 174 3 1.09

KDD22-028 240741.1 1372700 175.471 90 -54 264 11 33 22 5.7

Oxide Zone Including 19 22 3 31.13

Including 32 33 1 19.9

63 65 2 12.65 Sulfide zone

107 114 7 0.93

KDD22-029 240550 1372300 179.9 90 -54 276 54 57 3 1.03 Oxide zone

73 76 3 21.35

Sulfide zone

116 138 22 1.81

Including 120 124 4 6.12

160 170 10 0.81

192 210 18 0.77

KDD22-030 240723.2 1372500 176.9 90 -54 258 19 21 2 2.96 Oxide Zone

45 63 18 4.29

Sulfide zone

Including 48 54 6 9.83

Including 61 63 2 8.32

75 91 16 0.84

Including 86.3 88 1.7 6.67

176.7 178.5 1.8 5.6

KDD22-031 240806 1372500 176 90 -54 210 NSV

KDD22-032 240819.6 1372700 178.6 11.5 21 9.5 0.62 Oxide zone

45 56.5 11.5 1.83

Sulfide zone Inclusion 49 50 1 14

160 162 2 2

KDD22-033 240670.1 1372302 176.5 90 -54 250 26 51 25 5.32

Oxide zone Including 26 40 14 9.1

Including 46 51 5 1.11

51 83 32 1.66

Sulfide zone Including 68 70 2 13.14

156 177 21 1.9

KDD22-034 240519.8 1371902 177.2 90 -54 308 25 36 11 1.22 Oxide zone

141 167 26 0.65

Sulfide zone Including 152 162 10 1.32

180 186 6 1.28

206 209 3 1.65

Page | 8 of 10

243 267 24 0.83

Including 246 251 5 2.18

KDD22-035 240593.7 1371900 176.0 90 -54 250 26 28 2 4.91 Oxide zone

65 69 4 0.94

Sulfide Zone

101 105 4 0.84

118 128 10 0.54

157 160 3 4.42

Including 157 158 1 12.2

177 210 33 0.41

KDD22-036 240678.7 1371900 175.0 90 -54 190 20 30 10 1.2 Oxide zone

41 44 3 1.69

64 74 10 1.9

Sulfide zone

Including 65 66 1 14.3

166 190 24 1.66

Including 173 175 2 8.95

Including 185 187 2 4.37

KDD22-037 240760 1371900 173.0 90 -54 121 75.5 104 28.5 1.01 Sulfide zone

Including 80 82 2 4.44

KDD22-038 240560 1371900 176.0 90 -54 275 83 88 5 0.5

Sulfide zone

107 117 10 0.72

128.1 134 5.9 0.57

154 160 6 0.77

214 232 18 0.95

Including 222.5 229 6.5 1.87

KDD22-039 240640 1371900 175.0 90 -54 202.0 79 81 2 0.71

Sulfide zone 90 97 7 0.79

Including 94 97 3 1.7

121 123 2 2.55

KDD22-040 240720 1371900 173.0 90 -54 165 125 164 39 0.61

Sulfide Zone Including 125 133 8 1.21

Including 151 157 6 1.14

KDD22-044 240552 1371300 138.0 90 -55 290 190 180 10 0.8 Sulfide zone

279 284 5 2.04

KDD22-046 240602 1371300 139.1 90 -55 270 40 78 38 0.51 Oxide zone

Including 40 46 6 1.57

89 100 11 1.1

Sulfide zone 115 130 15 0.68

137 147 10 0.53

Notes:

1. Drill hole intercepts are calculated with a lower cut -off grade of 0.3 g/t Au and may contain lower grade intervals of up to 5

metres in core length.

2. Assays intervals are reported uncapped, but high grade sub-intervals are highlighted.

3. NSV – no significant values reported.

4. Insufficient drilling has been completed to establish true widths of the mineralized intercepts , but these are estimated to be

between 60-80% of the reported interval.