The 184 square kilometre Lati Permit, located in the Boromo greenstone belt, covers a major north-south trending shear zone and a number of known but under-explored prospects as well as three active artisanal mining areas. The Lati permit is about 150 km by road, of which about 100 km is paved, west of Ouagadougou, and lies 50 kilometres north of the Poura Gold Mine.
The United Nations Development Program (UNDP) conducted limited diamond drilling in the area of Prospect 1, reporting a 12m intercept grading 2.45 gpt Au. The Kwademen artisanal mining area has gold mineralization over an area of 1250m x 250m with isolated values up to 65 gpt Au occurs in quartz veins and veinlets in a sheared granites and felsic volcanics.
The Prospect 1 area is the site of rapidly expanding artisanal workings on the north end of the permit. The surface area of artisanal workings on Lati where miners have turned over and panned the top 2 metres of material has grown substantially since May 2011. Previously the surface area recorded in 2 principal sites was collectively 0.58 km2. By February 2012 the surface area of the artisanal workings on Lati in three principal sites was collectively 2.0 km2 with an estimated 3,000 artisanal workers panning the surface on Lati. Artisanal activity is recovering coarse grained gold, suggesting a proximal source.
These artisanal sites lie along the sheared contacts of a north-northeast trending 1500 metre wide band of bimodal volcanics and sediments surrounded by felsic intrusives. Mineralized quartz veins are common through this area, ranging from thin stockworks to metre-scale structures associated with regional scale shearing and fracturing mainly in mafic volcanic rocks. In 2011 Indigo conducted a campaign of soil sampling and grab sampling of quartz float over an 8 kilometre long strikelength. The results on these programs are shown in the following figures. Rock sampling returned values from trace to 11 gpt Au. The soil sampling defined two new soil anomalies 4.75km long by 100-750m wide and 1.5km long by 250-350m wide with values generally between 25 and- 5,000 ppb Au. These anomalies are shown on the soil geochemistry and RC Drilling maps as blue outlines.