Banro's second gold mine, Namoya, began commercial production on January 1, 2016
Banro's Namoya (oxide and free-milling) mine entered commercial production on January 1, 2016. At full capacity, the Namoya mine, a hybrid heap leach – CIL plant, is expected to produce 9,000 to 10,000 ounces of gold per month. In its first year of operation, the Namoya mine produced 93,253 ounces of gold.
Namoya has a Proven and Probable Mineral Reserve of 20.94 million tonnes grading 2.02 g/t Au containing 1.36 million ounces of gold. Measured and Indicated resources at Namoya are 25.68 million tonnes grading 1.96 g/t Au containing 1.62 million ounces of gold plus an Inferred Resource of 5.03 million tonnes grading 1.63 g/t Au containing 260,000 oz Au. The updated resource calculation used a cut-off grade of 0.4 g/t Au.
The Namoya property lies at the southern end of the Twangiza-Namoya gold belt in Maniema province, approximately 210 kilometers southwest of Twangiza and consists of one PE covering an area of 174 square kilometres.
Alluvial deposits of gold were first discovered at Namoya in 1930 and mined between 1931 and 1947. Primary gold was also discovered during this period and underground mining commenced on the Filon 'B' deposit in 1947. Further discoveries of primary gold mineralization were made at Mwendamboko, Kakula and Muviringu, where selective mining was carried out. The majority of this mining was based on small-scale underground development along specific mineralized quartz veins or stockwork zones. During the 1950s a small open pit was established on Mt. Mwendamboko.
Mining ceased in 1961, although there remained substantial un-mined resources in the various deposits plus several other untested mineralized targets. Limited regional and strike exploration appears to have been conducted since 1961. Total historical production at Namoya has been estimated at 278,000 ounces of gold.
The mineralization at Namoya is structurally controlled by a 2.5 km, NW-SE trending shear zone within sericite schists, which hosts a series of quartz 'stockwork' deposits. The auriferous vein systems outcrop at the summits of Mt. Mwendamboko, Mt. Namoya, Mt. Kakula, and Mt. Muviringu. Mineralized 'stockwork' outcrops have also been located on eight other hills in the general area.