In March 2004, the Unitary Agrarian Tribunal rejected the lease MSX had been using since 1999 to operate in "ejidal" lands because they had used falsified signatures. Then in 2004, the National Defense Secretariat gave MSX authorization to use of explosives, which violated a previous decree issued by the Second District Court. Then in 2004, the National Institute of Anthropology and History (INAH) presented a lawsuit against MSX, stating that historical monuments had been damaged by the new use of explosives. The nearby central historic district of the city of San Luis de Potosí is part of a UNESCO World Heritage Site. Finally in 2004, the Supreme Tribunal of Fiscal and Administrative Justice cancelled the environmental permit granted to MSX by the SEMARNAT in 1999, ruling that a permit never should have been granted. MSX requested an appeal and continued to operate. In 2005 the appeal was rejected and the Supreme Tribunal ratified the cancellation of the environmental permit. The mine was closed.