Project Summary: Isambara
Owner
Ownership 100% MDN
Location
Located 28 km north of the Tulawaka mine (Barrick 70%, MDN 30%) and 70 km west of the Geita mine of Anglo-Ashanti (> 10 million ounces).
Area
The prospect consists of 7 prospecting permits totaling 124.2 km2
Geology and mineralization
The Isambara gold project is located on the south border of the westward extension of the Geita greenstone belt that is oriented East-West.
The gold mineralization is hosted by an oblong granodiorite 4 km long and 2 km wide whose long axis is oriented N-S. This granodiorite intrudes Archean mafic volcanics composed mainly of mafic to intermediate tuff. Many NE-SW Proterozoic mafic dykes crosscut all geological units with apparent sinistral displacement.
An in-situ, 5 km long by 3 km wide regolith gold anomaly, the largest anomaly in the Tulawaka mine area, covers the oblong granodiorite with three main anomalous zones, the South, Central and North zones.
In the South zone, many NW-SE parallel gold-bearing structures composed of sheeted veins were defined by drilling over an area 750 m long 250 m wide. These veins, the most distinctive style of mineralization on the property, are composed of sheeted networks of parallel, low-sulphide content (0.1%-2% S and dominated by pyrite, pyrrhotite and rare chalcopyrite), single-stage quartz veins over 10s to 100s of meters. Grade is controlled by the density of small sheeted veins. Grades above 1 g/t Au are zones with densities of 3 to 5 veins per meter, such as ISDD-33 with 1.47g/t over 11.8 m. Individual veins may contain 30 g/t Au and more. Mineralization is single-stage massive, translucent grey or white quartz, locally with sericite most commonly on the vein margins
Towards the north within the Central and North zones the sheeted quartz vein networks are oriented approximately N-S, parallel to the granodiorite contact. Here, only a few RC holes have tested the gold-bearing structure. These include ISRC-133 with 0.78g/t over 77 m (Central zone) and ISRC-186 with 0.54g/t over 10 m (North zone).
The technical and scientific information contained in this document has been reviewed by Marc Boisvert, engineering geologist and Vice President, Exploration, who is a qualified person under National Instrument 43-101.