SOUTHERN PERU COPPER CORPORATION 12. EXPANSION AND MODERNIZATION PROGRAM SOUTHERN PERU COPPER CORPORATION 13. conclude in 2005 to define the method that will be used  in tailings disposal in Toquepala and Cuajone in the next  35 years.  In 2004 we did the engineering studies and procure- ment for a new Copper Filter and ancillary equipment for  operations. Civil work started in December and the new  filter should start operating in the second quarter 2005.  Progress so far has reached 51%. to the plant, purchases for the power substation started  during the third quarter of 2004 and the works for such  power substation, at the end of 2004. It is estimated that  the works will be completed by July 2006. The Location Studies for Tailings Disposal continued with  evaluations to replace the conventional tailings treatment  systems using cyclones with others like state of the art  flocculants and double cyclones. Studies and tests should  On the other hand, it is being developed the Engineer- ing for the Construction of the New PLS Dams Project,  this project is complementary with the Leaching Dumps  Project, given that, throughout the increase of the new  dumps, new collection dams are required because during  the construction of the new dumps a moment will arrive  where the deposited mineral would cover current PLS  dams, located in the Quebrada Toquepala. This Project  also includes pumping stations and PLS conveyance pipes  ready on their way to the field. Earth movement works  done in collaboration with Mine Operations concluded  after moving 1.4 million cubic meters to the large ditch  and work to prepare the platform for equipment assembly  started. Civil work for the crusher facility has accomplished  88% progress. By year end, electromechanical assembly  started and should conclude by June 2005, to then start  with commissioning and startup tests before building the  ramp to start laying down the mineral for leaching.  a fixed crusher at the exit of the mine, 6.5 km of conveyors  downstream to the south dumps and a system of stacking that  will allow to place leachable ore in dumps of low height (no  more than 30-50m). The ore size will be such that all of ith will  pass through the 9-inch mesh. The annual treatment capacity  will be 50.2 million metric tons of leachable ore. As of December 2004, 70% of the Project had already  been completed with the main pieces of equipment al- In reference to the Expansion and Modernization  Program announced in previous years, we continued their  implementation:  InToquepala,engineeringwasconcludedandtheconstruction  of the Leaching Dumps Project began. This project consists  in the replacement of the carriage of leachable ore through  truck by conveyor belts, which will require the installation of  Mill Site sunset at Cuajone Concentrator Li