The reason for the large increase?
Harvest Natural Resource today announced the Venezuelan National Assembly has approved the formation of mixed company Petrodelta, S.A. and the direct award of three additional fields to Petrodelta... An 80 percent owned Harvest affiliate will own 40 percent of Petrodelta and Corporacion Venezolana del Petroleo S.A. [CVP] will own the remaining 60 percent.
Overall, Harvest would probably be described by Pabrai by his principles "Low risk, high uncertainty situation" and "Heads, I win! Tails, I don't lose that much!" which can be found in his book The Dhandho Investor.
HNR 1-yr chart: