allmineral awarded contract for coal processing plant in Indonesia’s SEKAKO mine

Customer Projects Company 

Plant featuring a capacity of 500 tons per hour set to enter operation by mid-2019.

allmineral has been awarded a contract for the planning, equipping and delivery of a cutting-edge coal processing plant to be used in the SEKAKO Mine in Indonesia. Featuring a capacity of 500 tons per hour, this plant is set to enter operation at the 350,000-plus ha coal mining facility in Central Kalimantan by mid-2019 and is centred on a high-performance three-chamber alljig® F(UB) 5000 x 3400 jigger. allmineral will undertake this project with the support of long-serving partners Citec Engineering and Hazemag.

Indonesia is the world’s largest exporter of thermal coal, with production increasing from 246 million to 489 million tons per year between 2008 and 2013. Over 90% of the coal is exported to China, India and other Asian countries for heating purposes.
In order to meet growing demand on the global market, the newly tapped coal mining facility in Kalimantan is investing in cutting-edge processing technology from allmineral to ensure the efficient washing of coking coal.

allmineral’s partner Hazemag has designed the coal-washing plant with a high-performance roller crusher and a chain conveyor. The coal produced can therefore be separated from unwanted components such as gangue and classed in various qualities as part of an efficient and sustainable procedure that conserves resources.

The three-chamber alljig® jigger at the heart of the coal processing plant planned by allmineral will soon enter operation and handle the high-precision sorting of up to 500 tons of coal per hour. In the process, grain sizes ranging from 80 mm to less than 1 mm will be efficiently separated from the tailings and concentrated.

As reliable as it is economical, the alljig® G(UB) 5000 x 3400 first loosens the material prior to processing and passes a flow of water through it. Air inlets positioned beneath the jig bed are intermittently used to force air into the chambers, causing the water and material on the jig surface to rise up. When the air is discharged, the subsequent settling of the particles is governed by their respective densities: while the coal moves up, the tailings drop down. The alljig® then separates the heavy feed from the layered material bed via a pivoting bed discharge at the end of the jig surface. The light concentrate is dewatered on a static sieve and transported onwards using vibrating chutes. Tailings are discharged at the end of the third chamber, dewatered using a linear sieve machine and subsequently piled up.

The allmineral plant runs automatically. Discharging of coarse-grained or fine material via hydraulically actuated valves is subject to continuous monitoring and control, with measurements of the level and stock density performed if required. The sub-pulsed three-chamber alljig® jigger delivers physically stable operation and enables optimum jig stroke formation with minimum energy consumption.


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