I totally disagree. Vimy has to demonstrate to offtake partners...

I totally disagree. Vimy has to demonstrate to offtake partners that they have very long term supply capabilities.
Offtake partners will be looking to deal with companies that have current proven resources (tick for Vimy) and the ability to supply product 15 to 30 years down the road. Not too many companies will be able to meet these criteria but Vimy is positioning itself well to capitalise on meeting the utilities expectations.
Short term I wouldn't worry too much about the share price. The quality of Vimy will soon become apparent to sophisticated investors.