Location and History


Our Lefa mine is some 700 km north east of Conakry, the capital of the Republic of Guinea and is connected to an all-season road that has easy access to an air strip.

Commercial production began at the Lefa mine in 2008. The mine was acquired by Nordgold at the end of July 2010, as part of the Crew Gold acquisition, with financial results consolidated from August 2010.

Lefa gold mine operates a typical modern open pit operation with three major mining areas and several smaller, higher grade satellite pits, which will provide supplementary feed for the mill over the life of the project.

Gold production (koz)

2018 2017 2016 2015 2014 2013 2012 2011 2010
187.8 208.8 194.7 214.2 205.1 162.7 171.9 195.7 73.3
  • Notes:
    • Nordgold obtained a controlling interest in Lefa mine at the end of July 2010. Figures for 2010 represent only the period after Crew Gold was acquired by Nordgold, i.e. from August to December 31, 2010, while the 2011 column represents the full-year operations of Crew Gold as part of the group. All the changes in 2011 in comparison to 2010 are explained by the different periods of operations as part of the group in 2010 and 2011.

Mineral Resources and Ore Reserves Summary (31 December 2017)

Category Ore (Kt) Grade (g/t) Au (Koz)
Measured and Indicated 83,009 1.18 3,147
Inferred 34,200 1.08 1,192
Total (M+I+I) 117,209 1.15 4,339
Proven and Probable 56,026 1.22 2,198

For more information, please see Mineral Resources and Ore Reserves Press Release


Lefa consists of two main open pits and several smaller satellite pits, an eight-kilometer conveyer belt from Lero-Karta pits to the processing plant, a processing plant with a crushing circuit, two SAG mills, two ball mills and a CIP circuit, waste rock dumps, a specially constructed tailing storage facility, and a water management system.

Milling and Classification
Nordgold’s open pit operations use conventional surface mining methods involving drilling and blasting, followed by a load and haul process allowing for selective mining of the ore. Ore from the pit is then transported to a designated stockpile and fed into a crushing circuit. The crushed material is then moved onto a conveyor, which delivers the ore to a grinding circuit consisting of SAG and ball mills. The milled product is then thickened and leached into a CIP circuit.
Cyanide leaching and sorption
The cyanidation of the milled ore is carried out in the CIP or CIL circuit. During the CIP or CIL stage, pulp flows through several tanks where sodium cyanide and oxygen have been added to dissolve gold into solution. In the absorption stage, this solution flows through several tanks containing activated carbon. Gold then attaches onto the activated carbon, which flows counter current to the pulp, while screens separate the barren pulp from the gold-loaded carbon.
The final gold loaded carbon is removed and washed before undergoing elution. Elution is achieved by introducing the gold loaded carbon to a solution of sodium cyanide at a high temperature (>110°C) and under high pressure. This results in the reversal of the attachment process, with the gold detaching from the carbon back into solution. This produces a small volume of solution with a high gold concentration.
The gold loaded eluate solution that emerges from the elution process is passed through electrowinning cells, where gold is deposited onto the cells’ cathodes.
The cathodes then undergo a smelting process, further refining the gold and leading to the eventual production of gold ingots suitable for transport to a refinery.

2018 Deliveries

  • Increase annual mining volumes to 55Mt to match process plant capacity with optimal ore blend from open pits, including satellite oxide open pits to maximize mill throughput.
  • TSF 1 & 2 and powerhouse feasibility studies, SAG mill 2 pinion foundation repairs, and leach/CIP tanks refurbishment.
  • Exploration continues to evaluate the greater Fayalala complex potential, satellite open pits as oxide ore sources to maximise mill throughput, while deep drilling under the Lero-Karta complex commenced to test high-grade extension for potential underground mining.


tel.+7 495 644 44 73

Irina Dormidontova

tel.+7 495 644 44 73


tel.+7 495 644 4473 #707 6746