HRT has invested heavily in hunting oil in that province, where it believes seismic indicates significant deposits.
So far, it has only found natural gas, complicating prospectivity due to logistics and transport issues, and has felt backlash from investors accordingly.
Bloomberg reported that HRT, based in Rio de Janeiro, gained 8.8% to 4.08 reais at the close in Sao Paulo, the biggest advance since 6 December.
Late
