BOULANGER Gold Project
In July 2017, Reunion entered into a three-year option agreement to acquire a 100% interest in the Boulanger, Central Brief, Devez North, and the Devez South mineral concessions along with the Carapa exploration permit (previously known as Ste-Marie). The Boulanger Project is located approximately 40 km south of Cayenne, the capital of French Guiana. Access to the project is by National Road No. 2, followed by a network of forest tracks.
The four concessions, which cover an area of 78.2 km2, were originally granted to Compagnie Minière de Boulanger (CMB) by the French government in late 1880 and early 1920s. Due to recent amendments to the French mining code, all concessions will expire on December 31, 2018. CMB has filed applications to renew the concessions for a total area of 39 km2, which will cover all of the main exploration target areas.
Figure FG 3: Location of CMB properties
Figure FG x: Geology of the CMB properties region
Boulanger concessionsBoulanger concessions and Carapa exploration permit area map with outline of the detailed heliborne magnetometer and spectrometer survey covering the area of the ground induced polarization surveys.
Geology and mineralization
The Boulanger Project is underlain by Proterozoic rocks of the Armina and Paramaca volcanosediments intruded by granites and metamorphosed to greenschist facies. The Project area is cut by various shear zones characterized by intense deformation and recrystallization with evidence of hydrothermal fluids rich in sulphides and gold. Geological mapping and soil geochemistry indicate numerous anomalous zones that require follow-up exploration. Gold is associated with quartz veins, pyrite and locally intense tourmaline alteration.
Asarco explored portions of the Boulanger Project in the 1990’s, followed by Cambior and Iamgold more recently. The Boulanger Project is located in a historical gold producing area, both from placer and primary sources. The BRGM and other operators conducted extensive geological mapping, nearly 7,500 soil geochemical samples, trenching and over 12,000 metres of diamond drilling in the nineties, but stopped short from publishing a mineral resource estimate for the several prospects in the area. This work outlined gold occurrences characterized by quartz/tourmaline veining in volcanic and intrusive rocks cut by strong shearing. CMB has been carrying out small-scale alluvial gold mining operations on the mining concessions and produced around 200,000 ounces of alluvial gold between 1994 and 2016.
Following compilation of historical data and relogging of historical core, Reunion completed an initial drilling program in the Doyle prospect area. The objective of the program was to confirm historical mineralization in the northeastern corner of the Central Bief concession and to acquire structural information on the mineralized trends through oriented core drilling in fresh rock.
Work was carried out to re-log and re-sample historical core from the Carapa prospect, which was drilled by Iamgold in the 2000’s. In total, Iamgold or previous titleholders had drilled over 5,500 metres in the Carapa prospect area and identified gold bearing quartz/tourmaline-pyrite veins similar to those seen in the Doyle area.
Other work completed included a heliborne magnetometry and radiometry survey over the entire area, an induced polarisation geophysical survey over specific targets, and new targets generated by updated geological, geochemical and geophysical interpretation.