ROSEBEL GOLDMINES SURINAME Welcome IAMGOLD ROSEBEL GOLDMINES SURINAME REGIONAL EXPLORATION

STRUCTURE OF PRESENTATION Introduction Geology and property geology Weathering profile Goldmobilization and mushroom effect Exploration

INTRODUCTION Regional Exploration Find new targets for the mine Active in and out of the mine-site Working areas Mine-site; J-zone, Spin-zone, Blauwe Tent etc Koemboekreek en Kraboedoin Sarakreek

PROPERTY GEOLOGY

GEOLOGY The Rosebel concession lies within the Lower Proterozoic Guiana Shield, which stretches from the Amazon River in Brazil to the Orinoco River in Venezuela. The Suriname portion of the shield consists of distinct belts of low-grade metamorphic rocks, separated by large areas underlain by granites and gneisses.

LOWER PROTEROZOIC GEOLOGICAL UNITS OF SURINAME Rock unit Age Granitoid-Volcanic complex 1923 ± 55 Ma Marowijne group 2000 ± 40 Ma Coeroeni Group 2001 ± 97 Ma Falawatra group 2026 ± 20 Ma

MAROWIJNE GROUP Paramaka Formation Armina Formation Rosebel Formation (Basic to intermediate volcanic) Armina Formation (deepmarine sediments and volcanics) Rosebel Formation (Shallow marine-continental sediments)

WEATHERING Chemical weathering Mechanical weathering

TYPICAL WEATHERING PROFILE (TROPICS) Horizon Thickness (meters) Chemistry Weathered Rock Pisolitic clay zone Massive clay zone Mottled zone 0 - 3 0 - 10 2 - 10 Enriched in Fe2O3, depleted in SiO2 Enriched in Fe2O3, Al2O3, depleted in SiO2 Saprolite Transition zone 5 - 80 30- 100 Enriched in Al2O3, depleted in SiO2 Fresh rock Variable

TRANSITIONAL ZONE Grading from slightly weathered rock through to saprolite Primary minerals are pseudomorphically replaced by weathering products (such as kaolinite)

SAPROLITE Most weatherable primary minerals have been altered to secondary minerals such as kaolinite, goethite or amorphous iron oxyhydroxides. Weathering is isovolumetric The original rock fabric is preserved

MOTTLED ZONE Hydrated, clay-rich horizon Contains vertical stripes and mottles of hydrated iron oxides Water percolation creates a series of voids and channels, which can become filled with secondary kaolinite. All original rock fabric is destroyed.

MASSIVE CLAYZONE Featureless Brick red clay Containing less than 10 percent iron oxide concretions and pisolites

PISOLITIC CLAYZONE Featureless Brick red clay Containing 10 to 95 percent iron oxide concretions and pisolites Continued pisolite growth and cementation will eventually lead to development of duricrust

GOLD MOBILIZATION A leaching process takes place Light material (such as clays) leach Heavy material (such as gold) gets concentrated on the top layers Which will eventually result in…

MUSHROOM EFFECT

EXPLORATION To show indications, cheap and fast resulting methods are used To define the ore-body more effective and structured methods are used

EXPLORATION METHODS Panning Mapping of porknocking pits BLEG sampling Augering Fieldmapping Trenching Diamond drilling

PANNING

MAPPING OF PORKNOCKING-PITS Porknocking-pits indicate areas containing/contained gold Using a GPS the boundaries can be mapped While mapping the area, the source of gold can be determined (primary gold or alluvial gold)

BLEG SAMPLING BLEG = Bulk Leach Extractable Gold After panning the concentrate of heavy minerals is sent to the lab Gold is dissolved by cyanide and concentrated by extraction into an organic solvent.

AUGERING An auger is a device for moving material by means of a rotating helical flighting. A drill bit uses this mechanism to remove shavings from a hole being drilled.

AUGER-SAMPLING At first When anomaly results are received A large grid is augered with 400 meter spacing At each station (with 25 meter spacing) samples are taken from the first 2 meters When anomaly results are received Around this anomaly a smaller grid is sampled Sampling takes place each meter until 5 meter (deepauger)

AUGER-PROCEDURE Samples are taken from each meter Therefore each each meter is: Logged (using the augerlogsheet) Sampled ID-ed

AUGER-LOGSHEET

SAMPLING Each meter At the end of meter Homogenized Quartered 250 grams sample taken to sent for lab And a small amount in a chiptray for reference and further analysis

TRENCHING A trench is a type of excavation in the ground After studying assay results orientation and location of trench is determined

WHY TRENCHING? Create outcrops Study controls of gold-mineralization and gold-mobilization Determine if future drilling is needed Study orientations of bedding and quartzveins Determine how and at which orientation the possible drilling has to be done

DIAMOND DRILLING Diamond drilling is very expensive Advantage is that you will get in situ material in fresh rock After analyzing auger data and field-mapping data a drill spot is determined in the field

The samples from augering, diamond drilling etc… are afterwards sent to the lab for analyzing RGM Lab (on site) The Assay Lab (Paramaribo) Omai lab (Guyana)

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