The facility has a number of conditions precedent before becoming binding, including the provision of equity funding, with Walkabout understood to be in discussions with investors.
The loan has an 18-month grace period before repayments commence and a term of seven years to finalise.
Lindi Jumbo has a planned 24-year life, with a feasibility study estimating average earnings over that period of $46.2 million per annum.
Walkabout started the current quarter with A$1.9 million.
Shares in Walkabout were up 18% to $16.5c, capitalising the company at $57.6 million.