The Tongo licence area is located northeast of Kenema and is valid until the 24th November 2020. The licence (EL86/2011) covers an area of approximately 53.42km2 and is located in the Lower Bambara and Malgohun Chiefdoms in the Kenema District, Eastern Province of Sierra Leone.
Tongo is located on the Archaean Man craton and the property is underlain by tonalite-trondhjemite-granodiorite-gneisses and amphibolites typical of terranes of this age. These older rocks are intruded by Jurassic dolerite dykes and Cretaceous kimberlite dykes. It is the latter that are the hosts to typical kimberlite-hosted diamond deposits.
The Tongo exploration licence is prospective for diamonds; locked in a region of closely related known occurrences of kimberlite dykes and pipes, some of which are reportedly visible at surface. The topography is characterised by flats and terraces that are reported to carry diamonds and the area is crossed by both regularly flowing rivers and seasonal streams, which not only assists with the exploration process but provide potential for near term alluvial deposits that, once proved up, have the potential to generate cash to find long term hard rock deposits.
Golden Saint commissioned a high resolution airborne magnetic and radiometric AMAG survey over the Company’s three exploration licence areas in eastern Sierra Leone, by Canadian geophysical contractors, Geotech Airborne Limited (“Geotech”), to provide focus in both identification and prioritisation of strucural gold and kimberlite targets for ongoing and future exploration programs.
Processing and initial interpretation of the Tongo airborne magnetic data has identified strong structural complexity within the project with (1) the ENE- WSE trending structural trends beneath the transported cover, consistent with the regional structures hosting kimberlite dykes in the Tongo region, and (2) offset by later NW trending structure.
Field surface mapping and interpretation of satellite imagery has also verified the prospectivity of this project with location of previously unidentified remnant amphibolites and pyroxenites within the granite/gneiss terrain.
First phase field exploration activities on the Tongo Project have been completed and has involved stream sediment sampling, mapping and also continuation of the regional pit sampling program (1km x 1km), initially started in the early 2013, and covers the area not previously tested.
Analysis of these samples is prioritised following review of data and earlier preliminary sampling for efficiency and forwarded to Diatech Laboratories, a well renowned diamond laboratory located in Perth, Australia, for processing and indicator analysis.
Based on the information gathered from Aeromagnetic Survey and Analysis from Diatech Laboratories, GSR’s 2nd phase of exploration program in Tongo will re-commence in the upcoming dry season.