Grosvenor West is Carabella’s flagship project and has gained global attention, especially since Peabody Energy paid $4.9 billion for Macarthur Coal, which also produces metallurgical coal.

Carabella completed a revised JORC resource estimate based on drilling data up to last week. The revised JORC resource estimate shows an increase in total resources of 53% to 145.8 million tonnes.

“Importantly, the revised estimate also shows an improvement in confidence in the resource, with the measured and indicated resources increasing by 142% to 77.6Mt,” the company said.

Carabella's prospectus states Jakeman would receive one-off cash bonuses of up to a total of $650,000 upon reaching certain performance milestones, including performance against standards based on the JORC code.

Jakeman was issued 2 million options in the company when it listed last November and is also to be given an extra 5 million options if other specified performance targets are reached.

Jakeman’s relationship with Carabella, which soured when he quit Carabella in August over “irreconcilable differences” with the board, is expected to officially end in February next year.

He has since joined Centennial Coal chairman Bob Cameron as a member of the mining advisory panel for American coal exploration company County Coal, which is seeking to list on the Australian Securities Exchange.