Bulyanhulu is a narrow-vein gold mine containing gold, silver and copper mineralisation in sulphides. Mineralisation of Bulyanhulu is associated with steeply dipping Argillite units referred to as Reefs. To date, several distinct reefs have been identified, including Reef Zero, Reef One and Reef Two. The main rock types in the mine area are bimodal mafic and felsic volcanics rocks of the West Kahama segment of the Nyanzian age Kahama Greenstone Belt. The mafic rocks are predominantly flows, overlain by a series of felsic pyroclastics and ash tuffs. Argillites occur within the mafic flows and at the mafic/felsic contact and are the principal host for the mineralization. Mafic dykes/sills, commonly lensoid along their northwest strike, are a significant part of the lithological package southwest of the deposit itself. The Bukoli Granite, which separates the Kahama belt from the Rwamagaza belt to the west, lies approximately 3 km southwest of the mine. Together with regional faults, the Bukoli Granite forms the bounds of a rhomboid-shaped greenstone domain at Bulyanhulu. The gold mineralization, together with copper sulphides and silver, occurs in quartz veins localized along steeply-dipping structures parallel to the regional northwest strike. Nine of these extensive quartz vein systems have been discovered so far with Reef 1, hosted by a shear zone developed preferentially along the most extensive sedimentary unit, the most significant. The ore is characterized by sub con ........

In the second half of 2017 Acacia took the decision to place Bulyanhulu on reduced operations due to the inability to export gold concentrate. Following the transition to reduced operations in Q4 2017 Bulyanhulu is running on tailings. Underground production successfully restarted at Bulyanhulu in Q4 2020, with the plant recommencing processing of underground ore. Bulyanhulu mine utilizes a long hole stoping method. The backfill plant gets its material from the Float Process, and therefore there is no cyanide in the backfill going underground. Mineralization is associated with steeply-dipping reefs containing gold, silver and copper in sulphides.

- subscription is required.