SOSSEGO SAG MILL - 10 YEARS OF OPERATION AND OPTIMIZATIONS. Sossego mill was Vale's first plant to operate a semi-autogenous mill for processing copper and gold sulfide ore. The mill is located in Brazil. After the circuit commissioning, it was found out that certain variables were contributing to a lower than expected hourly output.

The first phase, the Base Case, consists of a concentrator with a single SAG (semi-autogenous grinding) circuit with an initial throughput rate of 100,000tpd. In March 2010, the key mining equipment was purchased. It included the major components for the 100,000tpd phase one copper-gold concentrator.

in a single stage SAG mill. Cyclones work best when the cyclone feed size is limited to 5 mm top size, as noted above when referring to screen selection. The product size is also …

Such figures would represent yearly additions of 8.3 kt in copper and 250 kg in gold productions. ... (38′) by 7.0 m length (19′) single SAG mill equipped with a 20 MW electric motor. The SAG mill product flows to two 3.6 m (12′) by 7.3 m (24′) horizontal screens, whose combined oversize (pebbles) is diverted to two Metso MP 800 cone ...

FQM's Kansanshi mine, located near Solwezi in the North-western Province of Zambia, is amongst the largest copper mines in the world and the largest in Africa. First Quantum Minerals are currently working on its further expansion including a standalone 25Mtpa processing plant that will increase copper production substantially.

The SAG mill is one of the largest volumetric capacity SAG mills in the world and represented the first 40 ft. SAG mill in Peru (Garcia & Villanueva, 2013 [1]). …

Sulphur Springs copper-zinc project reserves. The open-pit and underground mine is estimated to contain proven and probable ore reserves of 8.5 million tonnes (Mt). It is estimated to contain 119,081t of copper and 261,284t of zinc grading 1.4% Cu and 3.1% Zn respectively. Mining at Sulphur Springs

Furthermore, the SAG mill circuit indicated varying feed sizes (i.e. xF,80 =102 to 185 mm) which could be rectified by closer monitoring and control of ratios for the SAG mill feeders drawing the ...

The mine commenced its operation since April 2009 and treats a sulphide copper-gold ore to produce gold in form of doré bars and a concentrate containing gold, copper and silver.

20 to 30 TPH for gold ore SAG & Ball Mill duty; 25 to 40 t/h for copper porphyry SAG & Ball Mill duty; In Single Stage SAG duty, the approximate capacity reduces to only 8 to 13 TPH for gold ore duty. The autogenous mill itself is a coarse-grinding device, consisting of tumbling drum with a 25% to 40% volume filling of ore.

Toward a Simple Approach Determining Single Stage SAG mill' Aspect Ratio Authors: Johnny T. Kalala DRA Global, South Africa Abstract and Figures The author has developed a simple and sound...

SABC Grinding Circuit for the Pulang Copper Mine (P. Li) 09:00 09:15 Paper 4 Pilot study of rock transport rates in AG milling (G. Chiasson) 09:00 09:15 Paper 4 Optimization and continuous improvement of Oyu Tolgoi comminution circuit (G. Malkhuuz) 09:00 09:15 Paper 4 Commissioning of Single-Stage SAG mill at the Meliadine process …

Figure 2 – Single-stage SAG Mill Grinding Circuit Flowsheet . The circuit feedrate of 125 tph to 150 tph was primary crushed to an F80 size of between 105 mm and 120 mm and the SAG mill slowed down and charged with a 7% (by volume, v/v) load of 125 mm balls. The smaller diameter 400 cyclones produced an overflow P80 size of 90 µm to ...

The largest SAG mill is 42' in diameter, powered by a 28 MW (38,000 HP ) motor. A SAG mill with a 44' diameter and a power of 3 5 MW (47,000 HP) has been designed.

Autogenous-single stage, has not had wide acceptance because it requires a very competent ore that must be ground to a relatively fine size. ... AG & SAG Mill Grinding Compared – Which is Best. ... Island Copper, Boliden's Aitik Mine, and Lornex, can also be investigated in a pilot plant test. Another possibility to be tested is the use of ...

Context 1 ... closed circuit operation started in April 2008 along with smaller, 15 inch (381mm) cyclones instead of the 20 inch (508 mm) cyclones with the SABC circuit. The closed circuit SAG...

water usage. The crushed ore is transferred to a semiautogenous (SAG) mill or ball mill where the ore is further reduced in size. Water is added to the ball mill, in which a slurry that usually contains from about 20 to 55 percent solids is produced (Singh, 2010; International Mining, 2011) (see fig. 2). The

An analysis of flowsheets for processing sulfide and oxide copper ores, reagent modes, processing equipment, and flotation indicators in some domestic and ... (SAG) mills are used in the first stage of grinding and ores with 80% size more than 200 mm have a single grinding stage. Primary crushing is commonly carried out as close as …

The closed circuit SAG mill flowsheet is shown in Figure 2. Manpower was also streamlined to reduce fixed operating costs at that time as the circuit was simpler to operate and required less ...

Since the early 1980s, we have been designing and manufacturing Semi Autogenous Mill (SAG Mill) and Autogenous Mill (AG Mill) under the Fuller-Traylor brand. Semi-autogenous grinding uses a minimal ball charge in the range of 6-15% while autogenous grinding uses ore only. SAG and AG Mills operate by lifting ore/grinding media and …

These mills typically grind ROM ore in a single stage. A large example of such a mill was converted from a single-stage milling application to a semiautogenous-ball-mill-crushing (SABC) circuit, and the application is well described (Mainza et al., 2012). This section refers to high-aspect AG/SAG mills.

The sulphide ore is processed through single-stage crushing circuits involving one of the two primary crushers. Ore is sized to 6in and fed to the SAG mill. The SAG …

The purpose of the primary crusher is to reduce the ROM ore to a size amenable for feeding the secondary crusher or the SAG mill grinding circuit. The ratio of reduction through a primary crusher can be up to about 8:1. Feed: ROM up to 1.5 m. Product: -300mm (for transport) to -200mm (for SAG mill) Feed Rate:

in a single stage SAG mill. Cyclones work best when the cyclone feed size is limited to 5 mm top size, as noted above when referring to screen selection. The product size is also a function of liberation and downstream requirements. SAG Mill ore hardness kWh/t: Energy required to grind an ore from F80 of 152 mm to T80 of 1.7 mm.

Single stage AG/SAG milling AG/SAG mills as a primary grinding stage in a circuit with or without additional stages of comminution Inclusion of pebble-crushing circuits in the AG/SAG circuit Circuits …

Show details of benchmarking. Benchmarking: Bond/Barratt SAG Mill Specific Energy Consumption - Detour Lake. J. Torrealba-Vargas, J.-F. Dupont, J. McMullen, A. Allaire and R. Welyhorsky, The successful development of the detour lake grinding circuit: from testwork to production.Proceedings of the SAG 2015 Conference, September 2015, Vancouver, …

The Huckleberry mine, located in British Columbia, produces roughly 40 million lb/y of copper. A comprehensive energy and cost study compared an existing SAG mill-based circuit at the Huckleberry mine with two proposed circuits involving comminution technologies that are associated with energy efficiency: high-pressure grinding rolls …

Early SAG mills had a diameter of about 32', later increasing to 34, 36, 38 and 40'. At the same time the mill volume also increased. Typically a SAG mill has a much larger diameter compared to its length. Yet the SAG mill of Newmont's Yanacocha mine in Peru is a single stage mill (no ball mill after the SAG mill) and

Outotec has recently been awarded a contract to deliver one of the largest grinding mills in the world. The contract includes the design and manufacture of a Ø 40' x 29' SAG mill. The mill will be driven by a Gearless Motor Drive (GMD) which at 28.0 MW is equal to the largest grinding mill power ever used in the mining industry.

The three gearless mill drive (GMD) systems are the ABB most powerful ever made. The GMD for the 40-foot SAG mill has a power rating of 28 megawatts (MW), and the GMDs for the two 28-foot ball mills have a power rating of 22 MW. They are the largest diameter and most powerful SAG and ball mills drive systems at the highest altitude installed to ...