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Konnekta Mining Full Service Gold CIL Leaching

Gravity Gold – Rougher Concentrate Flotation CIL Leaching & Refining: This mineral processing plant is to recover gold from sulphide ore deposits. Provided here are all major equipment for a plant arranged to recover gravity gold, float a gold rich sulphide concentrate, liberate the sulphide hosted gold with a light regrind and dissolved its precious metals using the Carbon-in-Leach process. The CIL process with activated carbon is best suited for ores with no or some levels of preg-robbing carbonaceous material. The initial gravity circuit will extract any coarse GRG gold and silver. More difficult (refractory) ores may need deeper ultra-fine regrind prior to leaching as well and more elaborate processing, not included here.

This simple metallurgical concentrator includes single stage crushing, conveying, primary grinding, spiral classification, gravity concentration, slurry pumping, rougher and cleaner (optional) flotation banks, regrind mill, cyanide leaching tanks, loaded carbon stripping and regeneration as well as refining facility.


Konnekta-Mining CIL Gold plants 25 tph – 50tph – 100tph – 150 tph & 200tph.



Our standard packages are for process plants of:

  • 25 Tonnes/Day = 1 Tonne/Hour

  • 50 Tonnes/Day = 2 Tonne/Hour

  • 100 Tonnes/Day = 4 Tonne/Hour

  • 250 Tonnes/Day = 10 Tonne/Hour

This is a standard process plant which includes only the major components of the complete metallurgical flowsheet. A detailed engineering study is required to identify unforeseen omissions that may be required to design the optimum plant.

.With optimum cyanide concentration (about 0.05% NaCN), clean gold particles dissolve at a rate of 3.25 mg per sq cm per hour while for silver the rate is about one-half that of gold. Therefore, coarse gold particles (larger than 100 mesh) are usually removed by gravity concentration methods before cyanidation. In general, cyanidation process consists of percolation or agitation leaching of gold and silver ores with dilute cyanide solution, generally less than 0.3 percent sodium cyanide. In plant practice the addition of lime to a cyanide pulp is universal to prevent hydrolysis and to neutralize any acidic constituents present in the ore. Additional advantages of lime addition include decomposition of bicarbonates in mill water, improvement in settling rate in counter current decantation thickeners and improvement in extraction rates for certain types of ores such as telluride’s and ruby silver.

Various methods such as gravity concentration, flotation, panning, pyrometallurgy, cyanidation etc are available for the extraction of gold metal from its ores. Amongst these methods, cyanidation is the most common method used in the leaching of gold from the ore. This process involves the dissolution of gold containing ores in dilute cyanide solution in the presence of lime and oxygen. For refractory ores such as sulfide ores and carbonaceous ores which are not susceptible to direct cyanide leaching, various methods such as pressure oxidation, roasting, chlorination, biooxidation etc are available to treat these ores to expose the gold particles before cyanidation. Thioura leaching was developed as a potential substitute to cyanide leaching due to its lower toxicity and greater rate of gold and silver dissolution. Other alternative lixiviants to cyanide such as bromides (acid and alkaline), chlorides and thiosulfate are also being developed. The common processes for recovery of gold solution includes: (i) Carbon adsorption, Merrill-Crowe process, (iii) electrowinning and (iv) ion-exchange / solvent extraction. Traditionally, Merrill-Crowe process was used to remove gold from a cyanide solution by using zinc dust to precipitate gold from its solution. Carbon adsorption is increasing using in newer plants for gold recovery. Carbon in Pulp (CIP) technique involves contacting the leached pulp with granular carbon in a series of agitating tanks with a sufficient retention time.





Konnekta-mining offers all the major components of this complete process plant designed using these key design parameters:

  • Coarse/Fine ore bin

  • Vibrating Grizzly feeder

  • Jaw crusher

  • Conveyor belts

  • Liquid reagent feeders

  • Ball Mill

  • Spiral classifiers

  • Slurry pumps

  • Conditioner tank

  • Flotation cells

  • Thickener

  • Regrind Ball Mill

  • Trash screen

  • CIL tanks

  • Vibratory screen

  • Desorption Unit

  • Electro winning cell

  • Smelting Furnace

  • Centrifugal concentrator

  • Shaking table

  • Reagents used:
    SIPX, PAX, MIBC Frother, Flocculant, NaOH, NaCN Activated Carbon

  • Au grade =  15 g/t

  • Ag grade = 8 g/t

  • ROM = 100 mm

  • Jaw crusher F80 = 75 mm

  • Jaw crusher P80 = 12 mm

  • Steel balls = 2.5″

  • Ball Mill F80 = 12 mm

  • Ball Mill P80 = 90 µm

  • Spiral classifier overflow = 30%

  • Rougher pulp density = 33%

  • Rougher Retention time = 29 min

  • Spiral classifier overflow = 30%

  • Rougher pulp density = 33%

  • Rougher Retention time = 29 min

  • Thickener underflow 50%

  • Regrind Ball Mill steel balls = 1″

  • Regrind Ball Mill, F80 = 60 µm

  • Regrind Ball Mill, P80 = 30 µm

  • Regrind Spiral classifier overflow = 40%

  • CIL circuit pulp density = 40%

  • CIL Retention time = 48 hr

  • Gold production = 338 g/day

  • Silver production = 96 g/day




Using gravity to supplement either flotation or cyanidation is a well established practice in the gold industry. It differs from other recovery circuits in that most of the gold recovered by gravity would be recovered in any case by the circuit downstream, be it flotation or cyanidation. The economic justification of gravity is therefore based on small margins (for example, a net smelter return of gravity gold of 99%, as opposed to 94% for flotation). It was easily demonstrated when either flotation or cyanidation were relatively inefficient processes, and labour costs low (as gravity can be labour intensive). Over the past forty years, the introduction of better flotation machines (flash, column, high capacity), more effective collectors, and better control systems has increased flotation’s metallurgical performance, thereby decreasing the incentive for gravity recovery. Cyanidation technology has undergone similar changes, with the advent of activated carbon, oxygen and lead nitrate addition, and improved impeller design.

Today, gravity can remain an attractive option only inasmuch as it can be implemented with very low capital and operating costs. This has resulted in a relative shift away from gold gravity recovery (except for alluvial deposits), in the seventies and eighties. For example, as of the early nineties, gold gravity recovery has disappeared from the typical flow sheet. The advent of the Konnekta-mining Concentrator, at the beginning of the eighties, foreshadowed a resurgence of gravity recovery, as gold’s grinding and classification behavior makes it possible to achieve adequate gold recoveries with very simple, Konnekta-mining based, gravity circuits. Typical CIL circuit consists of two trains of eight tanks in series, which are fed from a common leach tank. The loaded carbon passes into a 15-tonne acid wash column. The gold is recovered from the loaded carbon in two 15-tonne elution circuits. Gold is recovered from solution by electro-winning and smelted in an induction furnace at the CIL smelt house.



Konnekta-Mining has developed on a cost effective process methodology to recover cyanide from the plant tails stream. This process is based on proven process technologies that have been used in the industry for over 50 years.

The benefit of this process will include but not be limited to:

  • OPEX savings:

    • Recovery of cyanide.

    • Eliminating costly detox reagent costs.

    • Environmental benefit on tailings disposal.

  • Recovery benefits – Increasing plant economics:

    • Recovery of Copper, if present in tails stream.

    • Additional gold recovery from tails solution.

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