The financial endowment behind Andrew and Nicola Forrest’s philanthropic Minderoo Foundation is expected to grow towards $40 billion by the end of the decade as the separated couple continue to hand over shares in iron ore miner Fortescue Limited.

It is understood the Forrests remain in lockstep when it comes to a commitment made in 2013 to give away the majority of their wealth, with more large Fortescue share donations to Minderoo anticipated over the next five years.