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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.

This section details a bulk sampling and test-milling program completed in 2011 at the Engineer Gold Mine. A 30 tonne-per-day gravity separation mill circuit was refurbished to process 400 tonnes of composite bulk samples from the Engineer Vein and Double Decker Vein. The existing circuit achieved an average gold recovery of 51.3% using ball milling and triple deck Deister tables.

The Gibraltar Technical Report outlines the recovery methods for the Gibraltar Mine, focusing on the processing of sulphide and oxide ores. Sulphide ore is processed at a rate of 85,000 tons per day through two bulk concentrators to produce a concentrate containing copper, molybdenum, and silver. The bulk concentrate is combined and processed through a single molybdenum flotation plant where molybdenum is separated from the copper via selective flotation. The molybdenum concentrate is dewatered and bagged for shipment, while the underflow becomes the final copper concentrate.

This report outlines the recovery methods for the De Bron Merriespruit (DBM) Project, focusing on gold recovery. Uranium recovery was evaluated as a potential byproduct but excluded due to marginal economics and additional capital costs. The processing plant is designed for a throughput of 80,000 tonnes per month, utilizing direct SAG milling followed by a Carbon-in-Leach (CIL) circuit. The CIL circuit is optimized at eight stages to minimize carbon inventory and gold lock-up, with a target recovery of 96.2%.

This NI 43-101 Technical Report excerpt details the recovery methods for the Molejón project, focusing on heap leaching for low-grade oxide ore and processing for sulfide ore. The process involves crushing ore to specific particle sizes, agglomerating with cement and lime to maintain permeability, and stacking on a double-lined heap leach pad. Pregnant solution is treated via carbon adsorption, stripping, and electrowinning to produce doré metal.