PROCESSING SOLUTIONS
where the secondary screening mesh is smaller than 50 x 50 mm, normal tags certainly would not reach the HPGR. The detection of tags at the primary crusher was also affected by the removal of the SmartTag system before the entire blast was processed for logistical reasons.
The tags were used to track the material during an optimiza- tion campaign at the plant. During the plant survey the material that fed the plant originated from the central portion of the blast. An unexpected result was that three of the mini tags were twice detected at the HPGR feed detection point. An explanation for this is that they survived the HPGRs and returned with the circulating ore (screened to +5 mm).
TowerMills on Tap for Lead/Zinc Project in Guatemala
Eirich Machines reported recently it has been awarded a contract to supply two TowerMills to a Central America mining project, with a May 2012 anticipated ship date. The Illinois, USA-based com- pany will supply two ETM-300 TowerMills to Minera San Rafael, S.A. for their Escobal lead/zinc project in Guatemala. M3 Engineering has been contracted to complete the plant design for the project. One TowerMill will be used for zinc regrind and the other for lead regrind. Eirich offers TowerMills ranging in size from the 10-hp (7.46-kW) ETM-10 up to the 1,500-hp (1,120-kW) ETM-1500.
Eirich's fine-grinding TowerMills have applications in a wide range of materials that include copper, zinc and lead ores, iron ore, slags, and others.
www.e-mj.com MARCH 2012 • E&MJ; 97
This article is based on a paper presented at the 35 Symposium 2011 in W tion, contact Michael W Process T
o , general manager o
echnology & Innovation, Michael.wortley@metso.com.
llongong, Australia. For additional info rtley
, PTI Products, Metso thAPCOM rma-