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gold fields ltd gold mine - driefontein - south africa - mining technology | mining news and views updated daily

gold fields ltd gold mine - driefontein - south africa - mining technology | mining news and views updated daily

Driefontein is located in South Africas West Wits Line goldfield, about 60km south west of Johannesburg. Driefontein Consolidated Ltd (Driefontein) was created in 1981 with the merger of the West Driefontein and East Driefontein mines. In January 1998, Gold Fields Ltd assumed management responsibility for the operation, which became a wholly owned subsidiary in May 1999. The mine, which has milled over 222Mt of ore and recovered over 102.5Moz of gold since 1952, employs 16,600 people. The average yield over the mines 55-year lifetime has been 14.2g/t.

The goldfield is part of the Witwatersrand Basin. Gold mineralisation occurs at depths between 1,000m and 4,000m below surface and is hosted within two major orebodies; the Carbon Leader Reef (CLR) and the Ventersdorp Contact Reef (VCR). A third body, the Middelvlei Reef (MR), is a minor contributor to the resource base. The CLR comprises various facies from single carbon seam to single and multiple band conglomerates. It is a high-grade reef at the base of the Central Rand Group, and at Driefontein dips at 25.

As of mid-2006, Driefonteins proven and probable reserves within the exiting mine infrastructure totalled 55.6Mt at a grade of 5.9g/t gold, containing 14.1Moz of gold. A further 31Mt of probable reserves at 8.2g/t lie below the existing infrastructure (deper than 3,420m below surface), containing an additional 8.3Moz of gold. The mines total proven and probable reserves amount to 94.6Mt grading an average 7.4g/t, and containing 21.6Moz of gold.

Driefontein is a conventional South African underground mine in which opportunities for increasing workplace mechanisation are limited. It comprises eight operating shaft systems which access the VCR and CLR. Shafts 1, 2, 4 and 5 access the eastern part of the mine while shafts 5, 6 and 7 access the west part. As the west part is depleted, production will be maintained by increased use of 1 and 5 shafts.

At present, production comes from a combination of longwall and scattered mining methods. This will continue on the VCR while extraction of the CLR will be based on dip-pillar mining with backfilling of the mined-out areas to facilitate secondary extraction of some 50% of the remaining pillars. The primary layout consists of 40m wide pillars with 140m spans and, after secondary removal, aims to achieve an 87.5% extraction.

Driefontein operates three primary metallurgical plants and a secondary recovery plant. New milling facilities have been installed in both the No.1 and No.2 gold-recovery plants, with a two-year programme having taken place to recover gold that had been locked up in the old equipment.

The East Plant processing route consists of three-stage crushing, rod and pebble milling closed by hydrocyclones, pulp thickening, pre-aeration, air agitated leaching, drum filtration, zinc precipitation and smelting to produce dor. The current operating capacity is 240,000t/month. The company aims to incorporate run-of-mine ore milling and to replace filtration with carbon-in-pulp recovery while increasing its capacity to 300,000t/month.

The West Plant consists of the VCR and CLR crushers combined with a central milling and treatment section that is divided into high-grade and low-grade sections. The process route is similar to that of the East Plant. Waste rock comprises approximately 3% of hauled ore and the average throughput is 170,000t/month.

The West Reclaim Plant mills rock-dump (waste and low-grade) material in a circuit consisting of primary crushing, SAG milling, two-stage cycloning and thickening. The product is leached and treated in a pump-cell plant. Loaded carbon is sent to the Leeudoorn metallurgical plant at Kloof for gold recovery and carbon regeneration. The plant is operating below design capacity at 115,000t/month of feed rock.

In the 2005-06 financial year, Driefontein produced 1,150,000oz of gold from 6.87Mt of ore milled. Of this amount, 3Mt of low-grade ore were sourced from surface material, with 3.87Mt being hoisted. This was marginally lower than the output the previous year, with some higher-grade areas having been affected by increased seismicity, while the overall yield from underground decreased from 8.3g/t to 8.1g/t. The combined yield was 5.2g/t, down from 5.4g/t the year before. As a result, total cash costs rose from US$330/oz in 200405 to US$355/oz in 200506, with total production costs of US$392/oz.

Gold Fields has been carrying out a feasibility study into ways of accessing the 8.8Moz of gold that lie below the mines existing infrastructure. Involving deepening the existing No.9 sub-vertical shaft, this would extend Driefonteins life by at least 13 years to around 2035. The company has also been evaluating the recovery of high-grade Carbon Leader reef pillars from the No.10 Shaft complex.

stone crusher for sale in south africa, gold ore crushing plant supplier

stone crusher for sale in south africa, gold ore crushing plant supplier

South Africa is Africa's first largest economy country, and the national has a high standard of living in the whole Africa. South Africa's economy is relative stability compared to other African countries. South Africa's finance, legal, communications, energy, transport develop very well, and it has complete hardware infrastructure and the stock market. Gold, diamond production occupy first around the world. South Africa is one of the five big mining countries in the world. The mineral mining, manufacturing, and agriculture are three economy pillar industries. Deep ore mining technology is in a leading position in the world.

South Africa is famous around the world for the abundant mineral resources. It has more than 70 kinds of proven mineral reserves and mining. Gold, platinum group metal, manganese, vanadium, chromium, silicon aluminate reserves are in the first of the world. The gold ore reserves account for 60% of the world, vermiculite, zirconium, titanium, fluorspar belong to the second, phosphate, antimony in fourth, uranium, lead are in the fifth, coal and zinc belong to the eighth position, and iron ore in the ninth, copper in 14th. Diamond, asbestos, copper, vanadium, uranium and coal, iron, titanium, mica, leads reserves are extremely rich.

Gold ore refers to the auriferous stones which are mined from mine by manual or mechanical. It also contains other metal impurities and so on. Gold ore contains the elements or gold compounds. After dressing, it will become high gold grade concentrate or gold sands. Gold concentrate smelting takes commission, and it will be of pure gold and gold products. At room temperature, gold is crystal, the cubic system, vertical lattice in heart. Good natural crystal shape is rare. It often shows irregular granular, crumb, flake, mesh, dendritic, fibrous and spongy.

In mineral stone processing line in South Africa, it will adopt gold ore crushers: gold ore jaw crusher and impact crusher. Jaw crusher is used for the coarse crushing stage which refers to break the larger gold ore materials into smaller ones. Impact gold ore will have the fine crushing process. After fine crushing, the materials will be taken into ball mill for further grinded. At last, it will be the gold ore beneficiation stage.

In South Africa gold ore processing plant, we will adopt the purified pyrite, chalcopyrite, natural gold mining equipment. First of all, gold ore mining will through the process of crushing. In the process of gold ore of coarse crushing, jaw crusher is mainly used as gold ore crusher. After coarse crushing process, you can get concentrated gold ore, more than 10 mm in diameter materials with standard CS series cone crusher and the screening machine.

Gold ore crusher used in South Africa has also been used as a main crushing machine in gold ore crushing industry. Jaw crusher is the most common type of gold ore mining crushing equipment. Jaw crusher can reach four to six crushing ratio. Therefore, jaw crusher is widely used in crushing high hardness, medium-hard and soft rock, such as slag, construction materials, marble and other minerals.

Gold ore mobile crusher is a new portable type gold stone crushing machine. Gold ore mobile crusher can remove barriers broken place and situation, and provide customers high efficiency, low capital projects factory. To the client, mobile crushing station is the best choice for South Africa gold mining line. In gold mining line, it involves gold ore crushing, screening, grinding, washing and so on. Gold ore crusher is mainly used for initial size loading. Jaw crusher can be decomposed into 150 mm or 6 inches, and then gold ore belt conveyor will transport gold ore rock materials to the gold ore vibrating screen which will send a large rock to the secondary crusher. Secondary crushing machine refers to the impact crusher and cone crusher.

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