IAMGOLD Reports Further Results from Its 2019 Drilling Program on the Lac Gamble Zone of the Rouyn Gold Project, Quebec

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Toronto, Ontario--(Newsfile Corp. - June 12, 2019) - IAMGOLD Corporation (TSX: IMG) ("IAMGOLD" or the "Company") today announced additional results from its 2019 winter diamond drilling program completed at the Rouyn Gold project optioned from Yorbeau Resources Inc. ("Yorbeau"), located 4 km south of Rouyn-Noranda, Quebec, and approximately 45 kilometers southwest of our Westwood operation. The Company is reporting assay results from an additional 21 diamond drill holes, totaling 6,181 metres. Results were previously reported for 10 diamond drill holes totaling 2,257 metres (see news release dated May 23, 2019). Results are pending from the remaining 17 drill holes, totaling 4,962 metres, and will be reported once they are received, validated and compiled.

The assay results reported herein are provided in Table 1 below and include the following highlights (a longitudinal section illustrating the drilling program on the Lac Gamble zone is attached to this news release):

Main Zone:

  • Drill hole GA-19-693: 10.9 metres grading 6.6 g/t Au
              includes: 4.2 metres grading 12.1 g/t Au

  • Drill hole GA-19-694: 29.7 metres grading 9.0 g/t Au
              includes: 11.1 metres grading 17.5 g/t Au
              includes: 3.0 metre grading 53.0 g/t Au

  • Drill hole GA-19-699: 12.8 metres grading 3.7 g/t Au
              includes: 5.0 metres grading 7.9 g/t Au
              includes: 1.6 metres grading 16.8 g/t Au

  • Drill hole GA-19-715: 3.3 metres grading 9.0 g/t Au
              includes: 0.8 metres grading 35.9 g/t Au

The objective of the 2019 winter diamond drilling program was to infill a portion of the Lac Gamble zone previously drilled by Yorbeau and various joint venture partners. The program was designed to achieve an approximate 50 x 50 metres drill hole spacing pattern to ultimately support the completion of a mineral resource estimate. The completed drill holes successfully intersected the targeted sheared Cadillac-Piché corridor which hosts the mineralized zone. The zone is characterized by alteration observed to vary from several metres to greater than ten metres in width, exhibiting variable carbonatization, fuchsite, silicification, crosscut by a network of white quartz and brown tourmaline stockwork veins and breccias. Gold mineralization occurs as small specks of visible free gold associated with minor sulphides in quartz-tourmaline veinlets.

Craig MacDougall, Senior Vice President, Exploration for IAMGOLD, stated: "The 2019 delineation drilling program continues to deliver positive results from the Lac Gamble zone. As mentioned before, our involvement in the newly optioned Rouyn Gold Project was based on the potential to rapidly delineate mineral resources along the targeted Cadillac Break, which could be evaluated as potential satellite deposits for our Westwood operation. Once the remaining assay results are in hand, the exploration team will work to develop a preliminary deposit model to support a future initial resource estimate."