CAPE TOWN, Oct 28 (Reuters) – A South African gold mining firm trying to cut carbon emissions and costs and improve the health of its workers could be the first globally to fuel trains with biogenic gas formed over millennia deep beneath the ground, one producer said on Tuesday.
Molopo South Africa, which holds the country’s first and so far only onshore petroleum production license, said it was partnering with Sibanye Gold to start underground testing next year on a locomotive that has been converted from diesel to run on compressed natural gas (CNG).
Biogenic gas, produced by bacteria interacting with ancient decomposing plants to release methane, has been found in South Africa’s Free State province, close to the mining operations of Harmony Gold, Sibanye Gold, and Petra Diamonds.
Although there has been research into its use in powering trains, it has never gone beyond the prototype stage, experts say. But the CNG locomotive was recently tested above ground and it managed to pull eight wagons carrying a 30 tonne load, the equivalent of those pulled by diesel engines, Stefano Marani, a director at Molopo, said.
“Which is a very big milestone to move to the next phase of what we believe is a world first,” Marani told Reuters. There was also a massive reduction in diesel emissions, with big health benefits for mine workers.