(June 2009)

MMSA is please to announce the installation and operation of twelve Aachen Reactors at the Loulo Mine in Mali. The Loulo Mine is 20% owned by the Mali government and 80% owned by Randgold Resources Limited who are managers of the mine. Randgold Resources is an African focused gold mining and exploration business listed on the London Stock Exchange and Nasdaq. They are one of the world’s largest gold producers. The supply of Aachen Reactors under a lease maintenance and service agreement is part of the MMSA collaboration with Air Liquide and in this case being managed by Air Liquide MALIGAZ in Mali. As part of the arrangement Air Liquide supplied an on-site oxygen plant.

The Loulo Mine is situated in the west of Mali, close to the Senegal boarder. The Loulo plant treats approximately 230,000 tons per month of ore. As part of the Air Liquide supply oxygen capacity at the plant has been increased from 5t/day to 15t/day. Despite this, before the installation of the Aachen Reactors, the dissolved oxygen levels in the CIL circuit remained low at around 1.5ppm. The twelve REA400 Aachen Reactors have now been installed to run with approximately 9t/day of oxygen. After installation dissolved oxygen levels immediately jumped to over 20ppm, demonstrating the higher oxygen utilisation possible with the Aachen Reactor Technology.