Nostra Terra Oil and Gas was one of the best performers of the day thanks to news that the Boxberger A#5 discovery is commercially viable. The well could be put into production within the next fortnight. Cash flow from this first well will help to bring other wells into production. Nostra Terra holds a 75% working interest before payout in the Boxberger wells in Kansas and 50% afterwards. Hewitt Petroleum owns the rest. Shares in Nostra Terra rose by nearly one-third to 1.81p each.