Name: Bulyanhulu Mine.
Location: The Bulyanhulu Mine is located approximately 55 km south of Lake Victoria and approximately 150 km from the city of Mwanza, in north-west Tanzania.
Brief history: In 1999, Barrick expanded to Africa, acquiring Sutton Resources, an exploration company with mineral properties in Tanzania, including the Bulyanhulu Gold Project. At the time of acquisition, the project’s gold reserves were 3,8-million ounces. Eighteen months later, Barrick had increased reserves to 10-million ounces and currently stands at 10,6-million ounces. Bulyanhulu began production in April 2001.
Brief description: Bulyanhulu operation has an average of 1 445 employees and 150 contractors on site.
Mining method: Underground trackless operation using longhole and drift-and-fill as its principal stoping methods.
Reserves: The total proved and probable reserves as at December 31, 2004, were 2,39 Mt at 0,443 oz/t.
Resources: The total measured, indicated and inferred resources as at December 31, 2004, were 4,25 Mt at 0,546 oz/t.
Geology: Bulyanhulu ore consists of mafic volcanic flows overlain by a series of pyroclastics and ash tuffs. Argillite is present at the contact between the mafic and felsic rocks. The gold, silver and copper mineralisation on the property occurs in mineralised ‘reefs’ or quartz veins localised along steeply dipping north-west-striking structures, generally localised in the argillite units. The zone strikes 310 degrees and dips steeply to the north-east. The mineralisation has been defined over a strike length of 5 km and averages 2 m to 3 m wide. The most significant structure discovered on the property to date is Reef 1, which contains the bulk of the mineral reserves defined to date.
Major infrastructure and equipment: The process plant consists of a crushing-and-grinding circuit, a copper/gold/silver flotation circuit, a tailings thickening/filtration circuit and a tailings storage facility. Power is supplied through a 220-kilovolt overhead line connecting the property to the Shinyanga Station and is purchased pursuant to a contract with the Tanzanian Electric Supply Company. Water is supplied through a 48 km pipeline from Lake Victoria to the property.
Future prospects: Based on existing reserves and current production capacity, the expected minimum remaining mine life is approximately 24 years. The current reserves are concentrated on one reef but significant exploration potential has been identified on two other reefs on the property.
Controlling company: Barrick Gold Corporation.
Contact: Alexander Davidson, executive vice-president of exploration and corporate development.
Unique features: The mine is Tanzania’s largest underground gold-mining investment. Drill results to date indicate that grades improve at depth.
Contact details: Barrick Gold Corporation Tel: (416) 861 9911 Fax: (416) 861 2492 Website: www.barrick.com
Edited by: Carla Thomaz
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