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It was determined that the primary cost driver and constraint is the SAG mill throughput. As mill throughput is a function of power availability (i.e., grinding capacity limited), the mill is relatively constrained by the volume of hard ore that can be processed, which in turn is directly related to the amount of metal recovered from the mill in this same period. Thus, the objective of the optimization methodology, in addition to maximizing the NPV of the operation, has been to optimize process throughput and revenue generated from recovered gold. The process throughput optimization is a function of the plant feed proportions of soft, trans, and hard ore types.

A community impact assessment will be completed five years after closure to evaluate the success of the social closure plan and to inform future projects by IAMGOLD and other companies

A secondary aspect of the sensitivity analysis focussed on the variogram model fitted for the pillow basalt zones. An alternative shorter-range variogram model was considered, which consisted of fitting very short scale structures with a range of no more than 45 m by 45 m by 16 m for the pillow basalt zone, up to 70 m by 70 m by 9 m for the pillow basalt LG zone, and 65 m by 65 m by 10 m for the pillow basalt HG zone. The overall impact of these alternate variogram models resulted in 2% less tonnage, at 1% higher grade, for a combined impact of less than 1% reduction in overall contained metal.

Inventor(s): Preston Cray Smith (Dallas, TX), Ronnie Dwaine Phelps (Dallas, TX), Roy Dale Crownover (Dallas, TX) Assignee(s): Texas Nameplate Company, Inc. (Lancaster, TX) Law Firm: Winstead PC (Local + 2 other metros) Application No., Date, Speed: 14136016 on 12/20/2013 (1656 days app to issue)

Sulphide concentrate in transition and hard rock samples showed that the majority of Au association is with pyrrhotite (47-73%). Over 50% of the gold grains in each sample were 1-5 micron, with the balance 5-10 micron. Negligible grains (<5%) greater than 10 micron were identified after gravity pre-treatment. Figure 13-9 illustrates the gold associations in transition and fresh rock samples. Figure 13-9 summarizes the gold associations from laterite and saprolite, transition and fresh rock samples by zone. No figure has been produced for the laterite zone since only one gold grain was observed in the NW Lat zone and no gold grains were observed in the SE Lat concentrate. Figures 13-10 and 13-11 show the distribution of gold grain size for each concentrate. In concentrate, NW Sap coarse gold grains were observed (≈30 µm).

Sampling procedures are described in Section 10. All samples were collected by, or under the secure supervision of, IAMGOLD-RGM personnel, from the time of sampling through to being received at the primary laboratory.

Based on SRK’s site visits completed in June 2017 and January 2018, SRK believes that drilling, logging, core handling, core storage, and analytical quality control protocols used by IAMGOLD meet generally accepted industry best practices. As a result, SRK considers that the exploration data collected by IAMGOLD and previous project operators are of sufficient quality to support Mineral Resource evaluation.

The camp complex is located approximately 0.5 km to the south of the process plant and truck shop/administration building.

“Engineers who maintain control panels and machines often spend up to half their time searching for technical data in assorted software, databases, activity logs and even old-fashioned filing cabinets,” said Simone Gianotti, EcoStruxure Industry business development manager, Schneider Electric. “With EcoStruxure Augmented Operator Advisor, engineers gain instant access to the information they need, meaning they can speed up operations, improve proactive maintenance and reduce human errors commonly associated with traditional maintenance procedures.”

Inventor(s): Fei Zhu (San Jose, CA), Yan Cui (Sunnyvale, CA), Yu Sheng Bai (Los Altos Hills, CA), Zhihong Li (San Jose, CA) Assignee(s): Futurewei Technologies, Inc. (Plano, TX) Law Firm: Conley Rose, P.C. (3 non-local offices) Application No., Date, Speed: 15055204 on 02/26/2016 (900 days app to issue)

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Figure 1. This piping layout is neither primary/secondary nor a “header-type” multi-zone system. It’s undefined among proven hydronic piping designs.