Mineral Processing Circuit

The NICO Project recovery methods involve a two-stage process designed to extract gold, cobalt, bismuth, and copper from sulphide ore. The initial stage occurs at the project site in the Northwest Territories, where a bulk flotation concentrate is produced from underground and open pit mining operations. This concentrate is then transported to the Saskatchewan Metals Processing Plant (SMPP) for hydrometallurgical treatment to separate the individual commodities into saleable products.

The Gas Hills Uranium Project Pre-Feasibility Study outlines an In-Situ Recovery (ISR) operation designed to extract uranium from underground deposits. The project utilizes a satellite facility approach, where the primary Ion Exchange (IX) circuit is located at the Gas Hills site, while downstream processing such as elution, precipitation, and packaging occurs at the Azarga Dewey-Burdock Project. This configuration allows for efficient resource utilization by leveraging existing infrastructure at the Dewey-Burdock facility.

The Mt. Hamilton Project is a gold and silver development project located in Nevada, USA, utilizing an open-pit mining method with a heap leach recovery process. The project is designed to process a leachable reserve of approximately 22.5 Mt of crushed ore from the Seligman and Centennial open pits. The recovery method involves a multi-lift heap leach with a carbon ADR (Adsorption, Desorption, Refining) plant, which was designed by KCA of Reno, Nevada, to facilitate detailed costing and construction scheduling for the 2014 Feasibility Study.

This technical report section details the process description and recovery methods for the Eagle Gold project. The gold recovery process is designed to leach approximately 11.5 Mt of ore per year with an average gold head grade of 0.65 g/t at an overall gold recovery of 76%. The operation utilizes a three-stage crushing plant operating at a nominal primary crushing rate of 29,500 t/d, feeding a Heap Leach Pad (HLP) system.

This technical report section details the operational performance and processing methods of the Piedras Verdes concentrator operated by Sierra Metals Inc. The plant utilizes a conventional concentration process including crushing, grinding, flotation, thickening, and filtration. Operational data from July 2018 to December 2019 indicates an average throughput of 3,224 tonnes per day, with improvements seen in Q4 2019 reaching 3,787 tpd.