Operations AngloGold Ashanti In Australia

      The Company’s Australasia segment consists of Sunrise Dam and Tropicana located in Australia. The Sunrise Dam Gold Mine is located in the northern goldfields of Western Australia, northeast of Kalgoorlie and south of Laverton. In the Sunrise Dam Gold Mine, mining is conducted by contractors and the ore is treated in a conventional gravity and carbon-in-leach (CIL) processing plant, which is managed by the Company.
      The Tropicana Gold Mine is located in Western Australia, east north-east of Kalgoorlie and east of Sunrise Dam. The Tropicana mine is a fly in fly out operation with village facilities at the mine. The Tropicana joint venture (JV) is a joint venture between AngloGold Ashanti Australia and Independence Group. Mining occurs from two pits, Tropicana and Havana with a contractor mining fleet. The mine is a fly in fly out operation, with a mine site village and aviation services operated from Perth and Kalgoorlie. The Tropicana JV includes approximately 3,000 square kilometers of tenure in the Tropicana belt, with exploration programs seeking both satellite extensions to the Tropicana Gold Mine and discoveries with standalone potential.

This is mining operations AngloGold Ashanti in Australia :

Sunrise Dam Mine

      Sunrise dam gold mine is located 220km northeast of Kalgoorlie and 55km south of Laverton in Western Australia. Mining of the Crown Pillar at the base of the 490m deep pit was completed in early 2014. By year-end, underground mining, which is conducted by a contract mining company, was the primary source of ore. Ore is treated via conventional gravity and carbon-in-leach (CIL) processing plant which is owner-managed.
       Gold ore at Sunrise Dam is structurally and lithologically controlled within gently dipping high-strain shear zones (for example, Sunrise Shear) and steeply dipping brittle-ductile low-strain shear zones (for example, Western Shear). Host rocks include andesitic volcanic rocks, volcanogenic sediments and magnetic shales. Total ore reserves as of the end of 2009 were 1.73Moz. Total mineral resources were 3.62Mozoz Au.
       The mine comprises a large open pit, which is now in its 11th year of operation, and an underground mine, which began production in 2003. All the mining is carried out by contractors and ore is treated in a conventional gravity and carbon-in-leach (CIL) processing plant which is owner-managed.
       Production for 2009 decreased 7% to 401,000oz, compared to 433,000oz for 2008.”Production for 2007 rose by an expected 29% to hit a record 600,000 oz, compared to 465,000 oz for 2006.”The GQ zone in the open pit provided the anticipated large volumes of high-grade ore, which accounted for the increase in annual gold production. Some 157,000oz oz of gold came from the underground mine. Progress was made in developing access to the Cosmo, Dolly and Watu lodes, and 2,000m of underground capital development and 6,100m of operational development were completed. A total of 67,400m of diamond drilling was also completed.
       Processing plant through put in 2009 increased to 3.9Mt from 3.8Mt due to plant productivity improvement initiatives. Total cash cost increased to $646/oz from $531/oz (up by 17.8%).Despite rising costs, the greater volume of ore mined, and the high value of the Australian dollar, the increase in production, due primarily to the higher grade of ore mined, resulted in the decrease in cash costs, year-on-year.
       Sunrise expects to produce 381,000oz to 398,000oz of gold from the mine in 2010, with over 157,000oz produced from the underground mine. The underground production is expected to increase for the next few years, with a peak annual capacity target of over 200,000oz a year targeted for 2013.

Tropicana Mine

       Tropicana gold mine is located 200km east of Sunrise Dam and 330km east-northeast of Kalgoorlie. Tropicana mine is a joint venture between AngloGold Ashanti (70% and manager) and Independence Group NL (30%), First gold was poured ahead of schedule and on budget in September 2013, following development approval in November 2010. The open pit operation features a large scale, modern processing plant which uses conventional carbon-in-leach technology and includes high-pressure grinding rolls for energy-efficient comminution.
       The Tropicana gold project  discovered in 2005, the project includes over 13,000km² of tenements extending over 300km of the historic contact zone between the Yilgarn Craton and the Albany Fraser provinces.”The project is a joint venture between AngloGold Ashanti Australia (70%) and the Independence Group (30%).”The project is a joint venture between AngloGold Ashanti Australia (70%) and the Independence Group (30%).It is expected to produce 470,000 to 490,000oz of gold annually over the first three years of production and the average production during its mine life is expected to be 330,000 to 350,000 ounce per annum.
       The Tropicana deposit is geologically different from other Archaean-aged, greenstone-hosted gold deposits found in the Yilgarn Craton. The Yilgarn Craton was formed following a period of intense tectonic and magmatic activity. It is dominated by granitic igneous, volcanic and gneiss metamorphic rocks, significant faults and intrusive basic dykes. The area is regionally characterised by the extreme weathering that resulted in the formation of a 100m thick regolith. “Mineralisation is up to 63m thick and has been drilled to a down-dip length of 600m. It remains open at depth.”
      Towards the west, the deposit is dominated by Archaean and Proterozoic aged granitic, volcanic and metamorphic rocks of the Yilgarn Craton.Younger sedimentary deposits that unconformably lie over the Archaean and Proterozoic rocks dominate the geology of the deposit towards the east.A north-south trough hosts the deposits that also include alluvial, lacustrine and Aeolian deposits. These deposits, ranging in thickness between 600m and 4,300m, have been formed due to rock erosion and weathering, and stages of marine incursion.
       The deposit is comparatively featureless and extends over a strike length of 4km. The three main physiographic units of the deposit include sediment dominant zones, ferruginous and siliceous duricrusts, weathered bedrock and colluvial materials.The sediment dominant zones are characterised by Aeolian sands that form extensive areas of plains and longitudinal dunes that are on an average 10m in height and between 1.5km and 5km in length.The width of the east-west oriented dunes ranges between 100m and 200m. The interdune areas are between 250m and 800m wide. Due to their symmetrical shape and presence of well developed vegetation, the dunes and sand plains are considered to be relatively stable and mature. Between 1961 and 1970, the dunes exhibited no significant movement or modifications, confirming the maturity of the landscape.
      The sediment dominant zones also host fluvial silts, halite deposits, and marine silts and clays that correspond to the existing and palaeo drainage systems.Regional zones of rock exposure are observed across the project area, typically along the ridge surface and low breakaway features. These zones of exposure have developed due to physical and chemical weathering of the less strong kaolinitic areas.
       Mineralisation is found within Archaean aged high grade quartzofeldspathic gneiss rocks that are associated with late biotite and pyrite alteration. It occurs as one or two laterally extensive planar lenses with a moderate dip.Mineralisation is up to 63m thick and has been drilled to a down-dip length of 600m. It remains open at depth.