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Bomboré

Summary

  • Near-surface, large tonnage (158 Mt), low grade (1.03 g/t) gold deposit
  • Shear-zone hosted: 11 km long x 200 m average width
  • 4.56 Moz of Measured & Indicated and 0.72 Moz of Inferred resources (April 2013) within optimized open-pit shells
  • Average depth of drilling to date is 120 m
  • 50% of the resource occurrs within 50m of surface
  • Open-pit Heap Leach and eventual CIL operation built in phases
  • Resource update completed Q2 2013
  • Update the 2011 Preliminary Economic Assessment of a Heap Leach scenario expected Q4 2013
  • Feasibility work on oxide only Heap Leach scenario during 2014
  • 85 km from capital, adjacent to paved highway, with nearby power & water
  • 100% owned (Projects are subject to a government 10% free carried interest and net smelter royalty)

Description

Orezone's 168 km2 Bomboré Project is the largest undeveloped gold deposit in Burkina Faso. Gold resources occur at surface in several zones contained within a gold-in-soil anomaly that extends virtually uninterrupted at a level of +0.1 g/t for 14 km and represents the largest gold anomaly in the country. 

Approximately 50% of the total resource occurs in the top 50 m and economic pit shells that constrain the resource can reach depths of up to 200 m if the geological model proves to continue at depth. 

Resources are open at depth and the average drilling to date is within 120 m of surface. With 35,000 oz of gold per vertical meter (0.3 g/t cut-off) in the top 60 m of the deposit, there remains an excellent opportunity to significantly increase resources at depth. Resources for the most part remain open at depth and along strike.

There is potential for a heap leach operation that can later be expanded into a CIL operation. Metallurgical recoveries of 80% are expected with heap leaching. The oxide material recoveries for a CIL scenario would increase to 92% for oxide, 89% of transition and 82% for fresh material.

The Bomboré project is located just 85 km east of the capital city adjacent to the national paved highway. The project is in an area of low population density, and local infrastructure includes a high voltage power line nearby, access to sufficient water and a local labor force. These infrastructure advantages should translate into reduced operating and development costs.

Geology

The Bomboré shear zone represents the dominant structure in the permit area. This kilometer-thick arcuate shear zone is interpreted as a subsidiary structure to the regional Tiébéle-Dori-Markoye fault.

The Bomboré Project geology is characterized by a shear zone with mafic to intermediate metavolcanic and felsic tuff rocks intruded by ultramafic, diorite and granodiorite intrusions. Layers of graphitic meta-sediments occur in places but are not considered preg robbing of materially affecting the envisioned operation.

Mineralization

All the Bomboré gold mineralization occurs within the main Bomboré shear zone and is associated with silica, sulphide and carbonate-albite-tourmaline-biotite alteration as well as arrays of quartz veins and veinlets. Gold is free and mainly associated with minor pyrite, chalcopyrite and arsenopyrite disseminations and stringers. The gold mineralization is preferentially associated with lithological contacts.

Bomboré 2013 Oxide Resource Pitshell Outlines at $1400 Gold- Includes Drill hole Composite Grades projected to Surface

2013 Priorities

  • Completion of expansion & infill drill program - done
  • Resource update completed Q2 2013 - done
  • Update Heap Leach PEA - Q4 2013

Reports

Press Releases