Between August 2010 and March 2011, inventories of bats was carried out done in six locations of the Copper Project concession of Minera Panamá, S.A. in the District of Donoso, Colon province. The objective was to characterize the bats in areas near of the company infrastructures and to contribute to the general knowledge of this group of mammals in the region. The bats were caught with mist nets of 12 m length by 2.6 m height, spread out in three simultaneous sites each night, with five nets in each one and placed at 0.5 m above the ground. The study recorded 419 bats, belonging to 32 species and 4 families. The Phyllostomatidae familily reported 407 individuals (97% of the captures) and 29 species (85% of total species). On the other hand, the Mormoopidae, Vespertilionidae and Molossidae families only registered one species each one. The most abundant species was Carollia perspicillata with 217 individuals (52%). The other abundant species were C. castanea with 50 specimen (12%), Dermanura watsoni with 37 individuals (9%) and Dermanura watsoni with 37 individuals (9%) and D. phaeotis with 32 individuals (8%). These species represent 80% of total bat captures. The abundance of the 28 species was included 13 or less individuals. The results of this study increases to 46 the bats known from the region between Cocle del Norte and Belen rivers, area of Donoso District, Colon province.