Pure play helium projects I have noticed need almost double the helium concentrations to be economic versus projects also capturing the natural gas.
The US has average 0.35% helium concentrations in their proven reserves per Edison.
Then 0.3% is considered economic so 0.35% average in the US is a profit margin of 0.05% only it appears although maybe more now if helium prices have increased.
Then 0.6% is needed for a pure play helium project to be economic as I understand it.
Little wonder the US is so supportive of Renergen with average helium concentrations of about 3% by providing the US OPIC US$40m loan to help execute the Phase One plant.
