Project Halo will buy Optimum Coal Mine for a maximum of R2.8bn, Koornfontein Mines for R200 million and Optimum Coal Terminal for R50m, according to the term sheet.
Bouwer van Niekerk, a lawyer for the business rescue practitioners, confirmed the winning bid.
Optimum supplies coal to Eskom Holdings, the state-owned power utility at the centre of an official investigation into claims that members of the Gupta family used their friendship with former President Jacob Zuma and his son Duduzane to secure business contracts.
They all deny wrongdoing.
Glencore sold Optimum to Tegeta Exploration and Resources in 2015, and it was placed under business rescue after Eskom refused to renegotiate what it said was an unprofitable coal-supply contract and issued penalties.
Halo, with directors who include Mbongiseni Duma and Paul Buckley, will also provide R600m financing over the next six months to ensure continued business at the Tegeta operations in Mpumalanga province and the Richards Bay Coal Terminal, according to the term sheet.
The deal is opposed by Oakbay Investments, another Gupta-linked company, which has also applied to the Pretoria High Court to remove the business rescue practitioners, Kurt Knoop and Johan-Louis Klopper.Bloomberg