In this study, the hydrometallurgical evaluation of a rare earth ore as well as a concentrate obtained from this ore was done in the laboratory. For the mentioned study, a bastnaesite type rare earth ore located in Beylikahir in Turkey was used. The total rare earth oxide (REO) content of the deposit was estimated to be 1 million tons with an average concentration of 3.42% REO. The rare earths were contained in bastnaesite mineral. The other constituents of the ore were calcium fluoride (52.5%), barite (25.4%), calcite (2.8%) and minor amounts of thorium, iron, manganese, etc. The bastnaesite mineral occurred either as cement material between fluoride and barite particles or was intimately associated with these minerals. The rare earth elements were enriched considerably in sub-sieve sizes.