The copper, zinc and gold miner has taken on Hatch because of his investment banking experience.
An engineer by trade, Hatch has also worked at RBS and ING.
Vast chairman Brian Moritz said he would be a strong addition to the current five-person board.
"We are very pleased to welcome Nick to the Board and believe his experience and technical insight will assist Vast as we develop our operations both in Zimbabwe and Romania as well as accessing new opportunities," he said.