Thor Energy PLC (AIM:THR, OTCQB:THORF, ASX:THR) shares lifted 25%, to 0.75p, after it said Phase-2 survey work at its HY-Range project in South Australia recorded natural hydrogen readings of up to 3%, giving the explorer added confidence as it moves the licence towards seismic work and drilling target definition. The company said the peak reading, equivalent to 30,000 parts per million, was around 60,000 times background levels.