Ore dressing aimed at the global market

The operators of the La Parrilla tungsten and tin mine in south-western Spain have entrusted the processing of extracted ore to the German mining specialists in order to achieve their production targets. Two alljig® fines jigs from allmineral will make a significant contribution towards doubling annual output in the Extremadura region to 5000 t/a over the coming years. Mining specialists W RESOURCES (WRES) are also anticipating an increase in product quality as a result of deploying this processing technology.


The La Parrilla mine near the Portuguese border is one of five sites on the Iberian Peninsula mined by WRES. The largest known tungsten deposits in the western world that can be mined cost-effectively are located some 300 km south-west of Madrid. By intensifying and optimising its ore mining operations in Extremadura the British mining company is looking to surpass the annual output of what is currently the world’s largest tungsten mine at NÚI PHÁO MASAN, by 2020. Around 90 % of the world’s production of tungsten goes towards making tungsten steel, the raw material for tool steels.


The two alljig® fines jigs are at the core of the new plant for efficient raw material extraction at La Parrilla. Thanks to the new technology the mine operators are aiming for a metal recovery of at least 90 % from the extracted ore minerals. The emphasis is on scheelite, which is obtained by flotation and then enriched into concentrates with more than 65 % tungstate. The Parrilla mine also extracts cassiterite, the world’s most significant tin ore with a theoretical tin content of 78.8 %.

With a throughput of 350 t/h the alljig® jigs will in future provide for a reliable and adaptable separation, concentration and cleaning of the preground ore (2-10 mm grain size). The air-pulsed twin machines are physically stable in operation, allowing an optimum jigging stroke with a minimum of energy consumption. The feed material is first loosened and fluidised by pulsating water, forming layers of grains according to their density and subsequently separating the heavy material from the stratified material bed. The jigging motion used to separate the particles is wear-free and induced by air, allowing the stroke motion (frequency, amplitude and shape) to be adjusted within a wide range of operating parameters.


Ore mines are just one area of application for the alljig® jigging machines, which are easy to operate and maintain. These energy-saving systems are capable of reliably and efficiently sorting primary and secondary raw and waste materials of different particle density: gravel, coal, ore, slag, sand, rubble, and various recycling materials.




Related articles:

Issue 2013-01-02

Key technology for efficient copper ore processing

The mine operator CUDECO is banking on innovative allmineral technology for processing their native copper. As of mid 2013, the Chinese state company ­SINOSTEEL will bring into operation ten jigging...

Issue 2010-12

Spotlight on countries in the CIS

In the first half of the decade, there was a great demand in Western Europe and Africa for allmineral’s innovative processing technology, but currently the spotlight is on countries in the CIS....

Issue 2012-09

allmineral opens office in Perth/Australia

With the most recent incorporation of allmineral ­Australia Pty Ltd allmineral directly contributes to the remarkable expansion of Western Australia’s iron ore mining industry. This direct...

Issue 2017-11

W Resources expands production with Metso’s technology

W Resources has selected Metso to build a high-capacity crushing plant for their La Parrilla Project in the south of Spain. With the plant, W Resources aims to increase their capacity while reducing...

Issue 2016-03

Innovative processing technology

Allmineral will present current projects and developments for the processing of sand and gravel, for recycling uses as well as for the mining industry at the bauma 2016. Sand and gravel For more...