Some traditional owners of land on which Adani’s proposed coal mine sits are in court seeking to bolster their appeal against the mining giant.

Their hearing comes as Queensland Premier Annastacia Palaszczuk set a mid-June deadline for the completion of two outstanding state approvals for the controversial mine in the Galilee Basin.

An appeal by some owners over the validity of an indigenous land use agreement with Adani is set down for Monday and Tuesday next week in the Federal Court.

But on Friday an interlocutory hearing in the Federal Court in Sydney is being asked if they can add new material, in relation to a newly published judgment, in a bid to strengthen their appeal.

If the request succeeds, it could potentially delay next week’s appeal over Adani’s indigenous land use agreement with the Wangan and Jagalingou people.