HeLIX Exploration PLC (AIM:HEX, OTCQB:HHEXF) said it has agreed to acquire Montana-based Treasure State Drilling LLC in a US$600,000 all-share deal that gives it direct control of the rig used across its Rudyard helium project in Montana. The AIM-listed helium developer said the acquisition would remove contract day rates, mobilisation costs and demobilisation costs from future drilling at Rudyard once the deal completes.