The popular movement in Cajamarca against the concession of mining permits to Yanacocha corp. for the Conga mining project, which would drain a number of lakes and dry up several streams, in addition to leaving the area with a legacy of toxic waste, called for a nationwide support mobilization on the 12th, so the the Conga issue was merged with the march already called by the General Confederation of Peruvian Workers (CGTP). (Marches also took place in Ica, in Arequipa, and -in defiance of a declared state of emergency- in Cajamarca)
The concentration point was at the Plaza Dos de Mayo -right in front of the CGTP headquarters- and the march was to end at the Plaza San Martin, a traditional spot for large political rallies. In between it wound through downtown Lima, stretching 8-10 blocks across four lanes of road.