The NeuquÃ©n authorities have granted Retama Argentina 4-year (initial) rights to the 128-sq km Parva Negra Oeste shale concession, a result of the companyâs successful bid under the NeuquÃ©n V round in September. Parva Negra Oeste lies NW of the Sierra Chata field on the Chihuidos High, adjacent to the Los Toldos I Sur (ExxonMobil, DEA 31 Oct â17). Retama (op) 90%, partner GyP NeuquÃ©n.  
Retama Argentina (op 90%, GyP NeuquÃ©n 10%) awarded Parva Negra Oeste (Vaca Muerta) concession. 