sentences:  The site was discovered in 1994 during the construction of the Xan-La Libertad oil pipeline in Guatemala.It was immediately recognized as an important, undiscovered Classic period (AD 200-900) Maya city and became the focus of an archaeological project.Directed by Charlotte Arnauld, Erik Ponciano, and Veronique Breuil, the La Joyanca project conducted excavations here between 1998 and 2003.