Increase SAG grate open area. 44% increase in throughput. Kambalda (2007) Grate design modification. Changes to Control and operating Philosophy. 15% increase in throughput. [3] Leinster (2006) Steel addition to AG mill. 10% increase in throughput. Mt Rawdon (2003) Addition of a secondary crushing circuit. 48% increase in throughput.
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mill throughput rates in the context of wide ranging vari-ability in "ore hardness" about a "design point." Typically, mill throughput rates from a large open pit can vary con-siderably during the course of a few days, e.g., from 40,000 tonnes per day (tpd) to 80,000 tpd through a single grinding line.
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Following implementation of these strategies, SAG mill throughput when treating the harder copper/zinc ores increased from a target of 2,750 mt/h in 2007 to 4,000 mt/h in 2009 and 4,400 mt/h in 2010-11. Optimization of the overall process also resulted in less energy consumption per ton of product. Continuous Improvement Delivers Further Benefits
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Mill throughput is a key driver for maintaining profitability at Mt Keith because of the low head grade (~0.5% Ni) and inherently low nickel recoveries due to the mineralogical makeup of the ore. The Nickel West Mt Keith Concentrator (NMK) has 2 parallel grinding modules consisting of one SAG Mill and one BALL Mill per module.
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feed size (F80) of over 70 mm and a SAG mill throughput of 5200 t/h. The Batu Hijau SAG mill specific energy was a function of point load test and RQD. The point load test substitutes for Axb measurement in that relationship. The Batu Hijau ore is less fractured than the Constancia ore based on the average RQD data and Constancia's SAG mill ...
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SAG mill is an investment that can produce handsome returns if extra production is needed or simply to give the mine the option to mill the hardest ores at design throughput rates. Typical tests required to define a hardness variability function, are given below in Figure 1.
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SAG mill control, insight, and reliability.!!!!! The throughput and efficiency of a SAG mill depends on the volumetric load: An overloaded mill has reduced coarse ore breakage, as the cascading balls and rock cannot drop far enough, reducing kinetic energy for breakage. An underloaded mill will break coarse ore well, but at the expense of ...
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The oversize pebbles are recycled through a small eccentric crusher, then back to the SAG or autogenous grinding mill. This procedure maximizes ore throughput and minimizes electrical energy consumption. Assuming your ore is AG-amenable: 7 TPH to 15 TPH is a comfortably production average for a 13′ x 4.5′ AG Mill.
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Optimise your mill capacity and throughput. Increase liner life and cut replacement downtime. Cut energy costs. Reduce safety risks to employees. Optimise SAG mill capacity and avoid unnecessary downtime. SAG mills are the main workhorses in the …
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• Increased SAG mill throughput by 5.9% and reduced energy consumption per tonne by 5.4% SAG Mill ACE BENEFITS • Automatically account for changes in variation of particle size or ore hardness • Minimize production disturbances • Maintain optimal production by minimizing changes to mill speed • Maximize production rate while providing
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provide information regarding the effect of changes in fill level on SAG mill power and throughput. Therefore, variables capable of explaining how changes in the PSD affect mill filling are required. They could be inferred based on the measurements delivered by visual sensors (Nunez F and Silva D, 2011).
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Reducing the F80 (80% of the feed size) to the SAG mill by 10mm will result in a 3-6% increase in SAG mill throughput, with the magnitude depending on the ore characteristics and the mill operating conditions; Source Ausenco
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Pdf Maximising Sag Mill Throughput At Porgera Gold Mill consistent with survey 2 exhibiting a finer SAG mill product smaller throughput with a pebble crusher running would have been between 631 transfer size to the ball milling circuit than survey 1 See Figure 6. and 935 dmtph for the feed size distribution achieved by this blast design.
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The 4.3m diameter x 6.7m EGL ball mill fitted with a 2,20 0kw motor operates in closed circuit with hydrocyclones. The grinding circuit throughput is greater than 220 dry tonnes per operating hour on blend of underground ore. Oversize material from the SAG mill trommel screen reports to a pebble crusher for size reduction.
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The SAG Mill is equipped with a variable speed drive which will allow the mill to operate between 1,500tpd and 2,300tpd. Furthermore, it is possible to …
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(PDF) Maximising SAG mill throughput at Porgera gold mine . This is dumped to the ground, the SAG throughput increased by 48%. Mill consistent with survey #2 exhibiting a finer SAG mill product (smaller throughput with a pebble crusher running would have been between 631 transfer size) to the ball milling circuit than survey #1 (See Figure 6). and 935 dmtph for the feed size distribution ...
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SAG mill throughput and energy consumption are non-linear functions of the mill volumetric charge. At any given time the mill throughput can be maximized, but as the weight for the SAG mill varies over time (due to the liner wear) the optimization must be repeated. A model-based optimizer has …
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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 …
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SAG milling can be optimised to achieve maximum breakage and throughput (or any other number of objectives). The relationships between the key variables are highly non-linear and shift as the ore hardness, steel load and liner conditions change. Traditional and basic control and modelling techniques are therefore not veryfective.
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8 - 9 August 2011 Perth, WA. Fig. 1- Increase in throughput over liner life for a large SAG mill. Unfortunately however, the 32 ft SAG mill that was studi ed for this project does not feature ...
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Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Amstar SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW.
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SAG mill throughput by altering blast design and crusher settings to provide an optimum feed size distribution to the mills. Hornblende A bulk flotation process using conventional cells produces a gold-bearing diorite was chosen for the study because it is the hardest ore at …
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Particularly for the Antamina case, a correlation was obtained, derived from measurements and data analysis, indicating that finer M4/M4A topsize and F80 mill feed gives higher SAG mill throughput ...
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Accordingly, the throughput reduction resulted in 17% increase in SSE, from 6.5 to 7.6 kWh/t–75 µm. The same occurred with the JAN sample i.e. the SAG mill circuit throughput obtained for the coarser PSD was 30% lower than the figure observed for the finer PSD. Accordingly, in this case the throughput reduction resulted in 13% increase in SSE.
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Historical Mill Throughput Average Monthly t/h Throughput design t/h 1000m. 4 DESCRIPTION OF THE YANACOCHA GOLD MILL OPERATION ... The SAG mill was designed to …
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There is a type of plant where the constant throughput SAG mill is sensible. If the SAG mill is not intended to be the rate-limiting step in a process plant, then it is best to adjust the SAG load (and power) to hold a constant tonnage to satisfy another constraint elsewhere.
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SAG mill throughput typically ranges from 473 - 515 tph depending on the ore type being processed. The cyclone overflow is the grinding circuit final product and the target 80% passing size (p80) varies from 75 to 110 microns. Part of the cyclone underflow reports to …
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The SAG mill throughput rate passed from 385 tons per hour to 440 tons per hour. The secondary crusher (XL900 671 KW) reduces the 4 -6 inches ore from the g yratory to a product with about 80% passing 1 -1.5 inches depending on the required mill feed rate.
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The main drawback of SAG - high power consumption. To reduce power consumption, I think: 1. The right determine of SAG feed size. This depends on the mill diameter and the ball size. Feed size necessary to take 80% of the maximum piece of ore that will crushed by the balls. For the big SAG more than 8 meters optimal feed size will be - 50mm.
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The goal of the mine is a mill throughput of 95,000 tonnes (104,720 tons) per day (TPD). Based on this goal, run-of-mine fragmentation analysis was conducted for four blasting designs resulting in powder factors of 0.44, 0.54, 0.64, and 0.94 kg/t. ... (SAG) mill. In this paper, a mine case study was conducted where there are four primary ...
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The contributing factors to higher than expected SAG mill specific energy (lower throughput) were: the low pebble recycle rate in the plant (an average of 24% of new feed) when compared to design (35% of new feed) and up to 60% of new feed in the pilot plant,
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throughput and final product size. This could be achieved through closer monitoring of the primary crusher performance and proper control of the ratios for the SAG mill feeders drawing the ore from the stockpile. The ball mill grinding efficiency was poor and could be indicated by the fraction < 125 µm of only 5-9 % or x. P, 80
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SAG mill is usually used to grind large pieces into small pieces, especially for the pre-processing of grinding circuits, thus also known as primary stage grinding machine. Based on the high throughput and coarse grind, AG mills produce coarse grinds …
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BRITISH COLUMBIA – Thompson Creek Metals of Denver said that mill throughput averaged 52,457 t/d during November at the Mount Milligan copper-gold project 145 km northwest of Prince George. That is a significant increase from the 44,077 t/d average during Q3 2015. The upturn comes thanks to the installation of a second SAG discharge screen deck in late October.
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throughput, or when the circuit is SAG mill limited, achieve the finest grind size possible, thus increasing mineral liberation and recovery. GrindingExpert™ has been shown to typically increase throughput by 3-6% GrindingExpert™. More Tonnage. Better Grinding GrindingExpert™ is a turnkey grinding solution that combines our industry
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Historically, the SAG mill ope rated at throughput rates as high as 900 or 950 t/h with sof t and fine ores compared to the design tonnages of 775 t/h, however, with coarser and harder ores, this ...
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Copper Mountain first feed to the SAG mill occurred in late May, 2011. The circuit began ramp up in mid-June of that year, with more consistent operating run times on the SAG and Ball mills. Plant throughput in the first months was quite variable with throughput tonnage greater than 40,000 tons one day and less than 25,000 the next on some ...
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