The 1,164 sq km gold property is a collection of 6 separate mining concessions located in South Kivu province of D.R.Congo, 41 km to the south-southwest of Bukavu, the provincial capital and 35 km west of the Burundi border.
The Twangiza deposit is a structurally and lithologically controlled hydrothermal gold deposit hosting 107.5 Mt of ore grading 1.60 g/ gold for 5.6 Moz.
Pit optimizations were undertaken on the two principal deposits that were estimated to contain 60.88 Mt at 1.87 g/t gold for 3.67 Moz.
The two deposits at Twangiza are planned to be mined simultaneously to provide throughput of 5 million tonnes of oxide ore to the processing plant in the initial years. The transitional and fresh ore types are planned to be stock piled during this period and processed once the oxide ore production begins decreasing.
The project has a favorable stripping ratio of 2.34.
Process plant uses single stage crushing followed by a SAG and ball mill operating in closed circuit with hydrocyclones. A conventional Gravity-CIL (carbon-in-leach) processing facility was designed for an annual throughput of 5.0 million tonnes of oxides or 3.75 million tonnes of transitional and fresh ore, or combinations thereof. The gravity circuit will recover 20-25% of the feed to the plant as free gold.
Gold production would total 2,615,807 ounces over 15 years life of mine, based on current resources. The average annual production was estimated at 261,965 oz gold for the first five years of operation.
The feasibility study envisioned the construction of a 30 MW, run-of-river hydroelectric scheme on the Ulindi River - Ulindi II site, 35 km from Twangiza site - utilizing a 600 meter natural drop in the river over a distance of approximately 8 kilometers.
A valley close to the mine site has been chosen for tailings deposition. The tailings dam design had to take into account the region's high seismicity rate and appropriate river diversion.
As there is no gold refining capability in East Africa and thus doré produced at Twangiza is to be refined off-shore, either in South Africa, Europe or Dubai.
- Nearest Landmark: Bukavu
- Distance from Landmark: 46Km
- Direction from Landmark: SSW
- Latitude: 2deg 55Min S
- Longitude: 28deg 45Min E
- Satellite Image: Click to View »
- Name: Banro Corporation
- Interest: 100%
Reference:31 December 2008