Mineral Processing Circuit

The Bongará Zinc Project NI 43-101 Technical Report dated June 18, 2014 states in Section 15 (Recovery Methods) that there is nothing to report.

The El Tigre Project Pre-Feasibility Study outlines the design for a heap leach processing facility targeting gold and silver recovery. The plant is designed for a nominal throughput of 7,500 tpd for the initial three years, expanding to 15,000 tpd for the remaining life of mine. The process relies on a three-stage conventional crushing circuit followed by heap leaching on lined pads, with solution recovery via a Merrill Crowe zinc precipitation circuit.

The Candelones Oxide Project, developed by Unigold Inc., outlines a heap leach processing facility designed to treat 5.6 Mt of oxide mineralization over a 3-4 year mine life. The operation utilizes an open pit mining method with a daily throughput of 5,000 tonnes. The process involves screening ROM material to separate fines, which are agglomerated with cement and cyanide, before stacking on a heap leach pad. Gold and silver recovery is achieved through a Carbon-in-Columns (CIC) circuit followed by an Adsorption, Desorption, and Regeneration (ADR) plant, ultimately producing Doré bars via electrowinning and smelting.

This section of the NI 43-101 Technical Report details the recovery methods employed at the Guanajuato Mine Complex (GMC) mineral processing plant. The facility processes ore from multiple mines within the complex, including the San Ignacio mine, blending materials since mid-2016. The plant operates with a throughput of approximately 779 tonnes per operating day, utilizing a five-stage process flow that includes crushing, milling, flotation, thickening, and filtering. The final product is a concentrate of iron sulphide (pyrite) containing high values of gold and silver, which is marketed and sold as the end product.

This 2018 Technical Report and Feasibility Study outlines the development plan for the Relief Canyon Gold Project in Nevada, U.S.A., operated by Pershing Gold Corporation. The project involves the expansion of existing open-pit mining operations to access gold and silver mineralization in the Main Zone, Jasperoid Zone, and Lower Zone. The mine is designed with an estimated life of 5.6 years, processing up to 16,700 tons of ore daily for a total annual throughput of 6.0 million tons.

The Mangazeisky Silver Project Feasibility Study Update outlines a comprehensive recovery method designed to maximize silver recovery while minimizing power requirements. The process flowsheet integrates a standard crushing and milling circuit with gravity concentration and agitated tank leaching. The gravity concentrates undergo intensive cyanidation, while the gravity tails are leached in agitated tanks. The resulting silver-bearing solutions are processed via direct electrowinning to recover silver metal, a decision made to avoid the complexity and cost of the Merrill Crowe process given the exceptionally high silver grades.