IAMGOLD Corporation announced an updated mineral resource estimate on its 100% owned Diakha - Siribaya Gold Project, located in western Mali, West Africa. The estimate was completed in accordance with the Canadian Institute of Mining, Metallurgy and Petroleum Definition Standards incorporated by reference in National Instrument 43-101. The Mineral Resource estimate comprises 18.0 million tonnes of Indicated Resources averaging 1.28 grams of gold per tonne for 744,000 ounces and a further 23.2 million tonnes of Inferred Resources averaging 1.58 grams of gold per tonne for 1.2 million ounces. The Mineral Resource estimate for the Diakha ­ Siribaya Gold Project incorporates assay results from 474 diamond and reverse circulation (RC) drill holes totaling nearly 73,000 metres completed at the Diakha deposit, and 702 diamond and RC drill holes, totaling approximately 94,000 metres completed at the Zone 1B and Taya Ko zones and along trend as previously estimated by RPA in 2015. The estimate was prepared using a block model constrained with 3D wireframes of the principal mineralized domains. Values for gold were interpolated into blocks using a 2- pass inverse distance cubed (ID3) interpolation method for the Diakha deposit and inverse distance squared (ID2) for the Zone 1B ­ Taya Ko deposits. A preliminary open pit optimization algorithm was run on the estimated grade block model to constrain the resource and to support the CIM requirement that Mineral Resources have `reasonable prospects for eventual economic extraction'. The resource estimate assumes a long-term gold price of USD 1,500/ounce. Only mineralization contained within the preliminary pit shell has been included in the resource estimate. In 2019, exploration and evaluation activities will continue, with approximately 10,000 metres of diamond and reverse circulation drilling planned to target resource expansions at the Diakha deposit and to explore selected priority targets elsewhere on the large property holdings for additional zones of mineralization. The Siribaya project is wholly owned by company and consists of 8 contiguous exploration permits which cover a total area of 596.5 square kilometres, located in the Kédougou-Kéniéba inlier of the West African Craton region of western Mali along the borders with Senegal and Guinea.