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The simplified process flowsheet is shown in Figure 17.1. Note that the term “tailings management

Grassy Mountain Feasibility Study Simplifies to a 750 t/d Crushing, Ball Mill and Hybrid Leach-CIL Plant

This section of the Preliminary Feasibility and Technical Report outlines the proposed recovery methods for the Grassy Mountain gold-silver deposit. The design features a conventional Carbon-in-Leach (CIL) plant with a nominal throughput of 750 short tons per day. The process integrates gravity concentration to recover free gold before leaching, utilizing a mobile crushing facility and a ball mill grinding circuit. The plant is designed to operate with two shifts per day, 365 days per year, with an overall plant availability of 91.3%.

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Star – Orion South Diamond Project — 2011 Feasibility Study

This section details the recovery methods for the Star – Orion South Diamond Project Feasibility Study conducted by Shore Gold. Metso Minerals collaborated on the design of a Process Plant tailored for the soft FalC Kimberlites. The plant design is based on extensive bulk sampling and metallurgical testing from 2004 to 2010, including data from the Bulk Sample Plant (BSP) operated at FalC.

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Nyngan Feasibility Study Uses High-Pressure Acid Leaching and Amine Solvent Extraction to Make 99% Scandium Oxide

This technical report outlines the recovery methods and process design for the Nyngan Scandium Project, located in Nyngan, New South Wales. The project involves the extraction of scandium from scandium-bearing laterite ore mined via open pit techniques. The ore is processed through a sequence of crushing, grinding, and high-pressure acid leaching to recover scandium oxide.

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Volcan Project — 2025 Technical Report

The Volcan Project Technical Report outlines a comprehensive recovery method for a heap leach operation designed to treat 60,000 tonnes per day. The plant is engineered for continuous 24/7 operation over a 14-year mine life, targeting gold and copper recovery from the ore feed. The flowsheet integrates primary, secondary, and tertiary crushing stages, culminating in a high-pressure grinding roll (HPGR) circuit to prepare the ore for agglomeration and heap leaching.

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Technical Report and Preliminary Feasibility Study: Hasbrouck and Three Hills Gold-Silver Project

This Technical Report and Preliminary Feasibility Study outlines the proposed development of the Hasbrouck and Three Hills Gold-Silver Project by West Kirkland Mining, Inc. The project consists of two separate facilities located approximately 5 miles apart. The Three Hills Mine is designed as a 15,000 ton per day ROM heap-leach operation with a full recovery plant, while the Hasbrouck Mine is designed as a 17,500 ton per day crushed material heap-leach operation. The Hasbrouck Mine will utilize the recovery plant located at the Three Hills Mine site for desorption and precious metals recovery.

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Twin Metals Minnesota Project — 2014 Pre-Feasibility Study

The Twin Metals Minnesota Project is a pre-feasibility study for a copper-nickel sulphide mine located in Ely, Minnesota. The proposed operation utilizes an underground mining method to extract ore from the Maturi deposit. The processing plant is designed for a throughput of 50,000 short tons per day, with a mine life of 30 years. The primary commodities are copper and nickel, with significant by-product recovery of gold, platinum, palladium, and silver.

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Salar de Diablillos Project — 2011 Technical Report

This NI 43-101 Technical Report outlines the Preliminary Economic Assessment for the Salar de Diablillos Project in Salta Province, Argentina. The project focuses on the extraction of lithium brine and the production of lithium carbonate, boric acid, and sylvinite. The proposed recovery method utilizes a combination of solar evaporation steps, in-field brine treatment, and chemical processing.

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Figure 17-1: Conceptual Heap Leach Flowsheet

Granite Creek Mine Project — 2021 Technical Report

The 2021 Preliminary Economic Assessment (PEA) for the Granite Creek Mine Project outlines a development plan for an open-pit mine targeting Gold and Silver commodities. The report evaluates two distinct processing scenarios: a conventional heap leach system and a Carbon-in-Leach (CIL) circuit. Both scenarios utilize open-pit mining methods with a 365-day, 24-hour operational basis. The heap leach option targets a throughput of approximately 9,370 short tons per day, while the CIL option targets 4,150 short tons per day.

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Figure 17-1 provides a simplified flowsheet of the heap leach process.

La Cumbre Mineral Resource Update and PEA — 2022

This technical report outlines the recovery methods for the La Cumbre project, detailing a dual processing strategy designed to handle oxide, transitional, and primary sulfide ores. The oxide and transitional ore is processed via a heap leach circuit involving crushing, agglomeration, and cyanide leaching, followed by solution treatment using Merrill Crowe and Carbon in Column (CIC) processes. The primary sulfide ore undergoes a conventional milling and flotation circuit, followed by tank leaching and carbon adsorption to maximize recovery.

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Figure 17.1 Process plant general process flow diagram (official drawing in French)

Kiniero Gold Project — 2024 Technical Report

The Kiniero Gold Project in Guinea is currently in the development phase, with a Technical Report completed in 2024 by Primero. The project is designed to process a blend of saprolite, laterite, transition, and fresh ores from open pit mining operations. The proposed process plant features a flexible metallurgical flowsheet capable of handling varying ore types while maintaining a nominal throughput of 5.0 Mtpa, with capacity to treat up to 6.0 Mtpa on high-oxide feed blends.

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