The Kalana Project is located within a Paleo-Proterozoic geological terrene, often referred to as the Birimian Gold Belt, which spans from Senegal, into Guinea, Mali, the Ivory Coast and Burkina Faso. The Birimian Gold Belt is estimated to have produced more than 250 million ounces, making it a prolific source of gold.
The Kalana gold deposit lies within Birimian-aged volcano-sedimentary sequence of rocks that is host to several orogenic (or mesothermal) gold deposits. These types of gold deposits in West Africa are typically shear hosted and are developed along strike-slip fault systems linked to late stage, non-orthogonal, crustal thinning.
The Kalana gold deposit is situated on the steeply dipping western limb of a regional syncline with folds plunging steeply to the north. There are small intrusions, commonly diorite and granodiorite, that are spatially related to the gold mineralization, and are common throughout the Kalana and Fougadian permits.
The Kalana gold deposit is situated near an east-west sigmoidal elongated diorite dyke with two major bodies intrudes the Birimian sedimentary rocks. The gold mineralization at Kalana is spatially related to these intrusions as they were the heat source that fueled the gold mineralization process. Similar intrusions at other gold deposits in West Africa (and elsewhere on the Kalana and Fougadian permits) are related to other gold deposits.
The Kalana deposit has been divided geologically into three structural domains based on the dip, strike and continuity of the quartz veins. These domains are known as Kalana I North, Kalana I South, and Kalana II, which are all located in the immediate vicinity of the small Soviet-era underground Kalana Gold Mine.
The gold mineralization is typically hosted in narrow, shallow dipping quartz veins (and associated inter-vein mineralization) that are defined as vein package domains. The delineation of these vein packages through drilling has been the main exploration focus at Kalana over the past several years. This recent exploration work, which included 132,000 metres of drilling over 771 holes at the Kalana deposit, formed the basis of the 2014 mineral resource reported as part of the Kalana PEA.
Gold mineralization within this type of deposit has a high fraction of coarse gold mineralization that is structurally and lithologically controlled (and tied to zones to regional-scale deformations). These vein packages exhibit strong continuity, as shown in the following northwest-looking section through the Kalana Deposit.
For a more detailed discussion of the exploration history, the geology and the nature of the gold mineralization of the Kalana Gold Project, please consult the Kalana PEA.