In late November 2017, YPF was reported to sign an agreement with Argentine company, Oilstone Energia, to cede its 100% interest on the 250 sq km Cerro Bandera license, Neuquen Basin. Oilstone has already been operating the block through a service contract since 2011. The contract was renegotiated in 2015 and will expire in November 2027. The company will be the new official operator but has agreed to grant rights to YPF for new exploration and the possible development of unconventional targets like Vaca Muerta and Los Molles formations, as well as a gas project in the northern area of the block. Oilstone has been extracting oil and gas from wells with conventional targets in the Lajas Sandstone in this block.  
Argentina, Cerro Bandera