Weir Minerals, a supplier to the global minerals processing industry, has announced the sale of a KHD high pressure grinding roll (HPGR) to Toronto Stock Exchange Venture listed Goldrock Mines for installation in an Argentina heap leach gold mine.

After a hard fought competition by all major suppliers, Goldrock Mines awarded Weir Minerals North America an order for the supply of a roller press (RPS), or a high pressure grinding roll (HPGR) as it is known in the minerals industry. The scope of supply includes a RPS 16-170/180 HPGR, along with motors with variable speed controllers, and special tools.

Goldrock’s Lindero project consists of a porphyry gold deposit located in northwest Argentina and includes a shallow open pit mine, two stage conventional ore crushing, followed by a closed circuit HPGR crusher, conventional heap leaching, and a carbon absorption-desorption-recovering processing plant for precious metal recovery.

The KHD HPGR will process about 955 tonnes/hour for the gold heap leach process. It will operate in a closed circuit with edge recycling, to ensure adequately sized feed is provided to the heap leach pad.

High pressure grinding rolls are increasingly being used in comminution circuits instead of conventional crushers and AG or SAG mills due to their lower capital cost, lower energy consumption, lower maintenance requirements and enhanced downstream mineral recovery.

In April, 2013 Weir Minerals signed an exclusive and perpetual licence with KHD Humboldt Wedag (KHD), giving Weir Minerals direct control over the design, manufacture and distribution of high pressure grinding rolls in minerals processing applications using KHD technology.

Weir, a FTSE 100 company founded in 1871 and headquartered in Glasgow, Scotland, is a global provider of engineering solutions to the minerals, oil and gas and power sectors. Its commitment to engineering excellence, research and customer focus extends equipment wear life and operational capability in some of the world’s most challenging environments.

Weir has a presence in more than 70 countries, with more than 14,000 staff working in three divisions - Minerals, Oil & Gas and Power & Industrial. Weir’s customer base includes the world’s largest mining houses, major oil services businesses and nuclear and conventional power generation companies.

Weir Minerals employs more than 7000 people worldwide, delivering end-to-end solutions for all mining, dewatering, transportation, milling, processing and waste management activities.

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