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IAMGOLD ESSAKANE DEPOSIT (4.8Moz)

12 November 2013

 

ESSAKANE DEPOSIT

Location and Access

The Essakane property has an area of about 1400 km2, and is located 330 km North East of the Capital of Burkina Faso, Ouagadougou. It straddles the boundary of the Oudalan and Seno provinces in the Sahel. It is situated 42 km east of Gorom-Gorom the nearest town.

Access from the capital Ouagadougou is by paved road over 263 km to the town of Dori, and then by laterite road over some 63 km to Essakane. Access via the town of Gorom-Gorom to the west is also possible.

Project History

  •  1985 Discovery of Essakane by “orpailleurs” (artisanal miners)
  • 1992 BUMIGEB constructed heap leach plant
  •  1993 CEMOB / BHP Minerals exploration
  •  2000 Bankruptcy of CEMOB
  •  2001 Exploration by Ranger Minerals
  •  2002 OrezoneInc. / Gold Fields joint venture
  •  2005 Gold Fields became operator; Exploration and pre-feasibility study.
  •  2007 OrezoneResources Inc. became 90% owner of Essakane
  •  2009 IAMGOLD acquired Essakane by acquisition of Orezone Resources Inc.
  •  2009 Construction commenced and commercial production started July 16, 2010

Geology

The Essakane Project is located in the Palaeoproterozoic Gorouol Greenstone Belt in northern Burkina Faso, in an outlier of folded sedimentary Birimian rocks which are intruded in places by intermediate and mafic sills.

The Birimian rocks consist of wackes, arenites and mudrocks (argillites), pebbly arenites and minor tuffs which show lower greenschist metamorphism facies.

Arenite is the dominant lithology. Intermediate intrusions occurring as sills are common and appear to predate all gold mineralization in the district.

The Tarkwaian rocks are typically sandstones with thin intercalated bands of conglomerates.

The region preserves evidence for at least two regional deformational events. D1 structural event associated with the Essakane host anticline are refolded by a series of NNE-trending F2 folds.

The Markoye Fault trends NNE through the western portion of the project area and separates the birimian rocks from an Archaean granite-gneiss terrane to the west.

Deposit type

The EMZ is a greenstone-hosted orogenic gold deposit. Specifically, it is a quartz-carbonate stockwork vein deposit hosted by a folded turbidite succession of arenite and argillite. Gold occurs as free particles within the veins.

MINERALIZATION

The Essakane Main Zone (EMZ) is currently the largest known gold deposit in Burkina Faso. Gold occurs in a quartz vein stockwork within an anticlinally folded succession of Birimian-age arenite and argillite.

The main arenite (50-70m thick) is the economically most important rock type within the EMZ.  The arenite occurs within the east limb, fold hinge and west limb domains.

The highest concentration of quartz veins and gold is found in the hinge zone of the anticline and in the upper part of the east limb main arenite. The economic gold grades can be traced across the 2,500 m strike length of the modelled EMZ. Disseminated arsenopyrite in the host rock decreases away from the veins.

The EMZ is a coarse gold deposit with particles up to 5 mm in diameter. Gold occurs as free particles within the veins and also intergrown with arsenopyrite on vein margins or in the host rocks.

RESOURCES AND RESERVES

The area of interest is the Essakane Main Zone (EMZ). Resources estimation was based on a 0.5g/t cut-off grade. The average metallurgical recovery over the life of the mine is estimated to be 94.6%.

(source company web site / press releases).

ESSAKANE (31 DEC 2012)

TONNAGE (000)

GRADE (g/t)

Au (oz)

PROBABLE RESERVES

114377

1

3293000

MEASURED RESOURCES

6071

0.9

160000

INDICATED RESOURCES

149172

0.9

3996000

INFERRED RESOURCES

25698

0.8

627000

TOTAL RESOURCES

180941

0.9

4783000

NB: Most of the figures are modified from company public data

 http://www.iamgold.com/

 

 

12 November 2013

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