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The plant main substation is located next to the electrical room. It transforms the incoming voltage from 161 kV to 4.16 kV. The substation size is sufficient for the present requirements and for an eventual hard rock expansion.

Around 300 g of the coarse material > 75% passing 8 mesh is precisely measured and used for the PAL manipulation. This pulp material is put in an iron container with 1,000 ml of water, two cyanide assay tabs, and with a few steel balls (two balls of 36 mm, four balls of 27 mm, and 1 kg of 12 mm). The PAL machine grinds and leaches the material for 90 minutes. An aliquot of 10 ml is collected per pot (The PAL runs 52 pots at the same time). The aliquot is sent for atomic absorption analysis after having filtered the grind media out.

In June 2013, IAMGOLD, RGM, Grasshopper Aluminum Company N.V., and the Republic of Suriname executed the Second Amendment to the Mineral Agreement. The Second Amendment created a new Unincorporated Joint Venture vehicle (UJV) in which the Republic of Suriname would hold, through NV1, a wholly owned subsidiary of the Republic, a paid 30% interest and RGM would hold a 70% interest. Under the terms of the Second Amendment, NV1 has been granted an option to acquire an increased interest in production from the RGM concession if RGM approves a Significant Expansion of the existing mill and if NV1 elects to participate in the Significant Expansion by funding 30% of the capital required for the expansion.

Golden Star, and later as a joint venture with Newmont, conducted three phases of DD drilling totalling 90 holes (9,293 m) between 2002 and 2010 on the Saramacca concession.

The Saramacca property, included in the disclosed Resource and Reserve estimate, is owned under a joint venture agreement in which the Republic of Suriname holds a 30% interest and RGM holds the remaining 70%. Details of the ownership structure are provided in Section 6. Commercial production has not started at the Saramacca property, and is currently scheduled for the second half of 2019.

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Weather data is collected on the Rosebel property on a regular basis since 2003 using a manual weather station (Old Camp) and since 2005 using an automated weather station (tailings area).

In the immediate surroundings of the RGM concession, there are eleven other Maroon villages that are considered by RGM communities of interest (CoIs) with the potential to be directly impacted by or have influence over RGM operations and the Saramacca project. These villages are; Marshallkreek, Klaaskreek, Nieuw-Lombe, Balingsoela, Brownsweg, and Kwakoeugron in Brokopondo District; and Nieuw Jacobkondre, Baling, Misalibi, and Bilawatra in Sipaliwini District. These, along with Nieuw-Koffiekamp are considered the direct area of influence of the company’s operations.

If any standard fails, all the samples between this standard reference material and the next one and the previous one have to be re-assayed. If a trend or bias is observed, an investigation has to be run to solve the origin of this abnormal behavior.

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It is to be mentioned that one composite sample of duricrust was tested, however, because the amount of duricrust in the total LOM is marginal. No more extensive testing was performed on this type of ore and the recovery was not deemed problematic. An overall recovery of 94%for laterite (inclusive of duricrust) was applied for the pit optimizations.

Intense detailed pit mapping in East Pay Caro, West Pay Caro, J Zone, Rosebel, Royal Hill, Roma, Overman and Mayo to be used in further development of the pits, identifying optimal drilling directions for MinEx and RC grade control and update geological interpretation