The three mining majors are the founding patrons of the "Charge On Innovation Challenge", a global competition launched in May.

It now has 21 patrons, more than 350 companies have registered interest as vendors and more than 80 organisations have submitted expressions of interest.

The patrons, supported by Australia's METS industry body Austmine, will assess the proposals over the next month and select a shortlist of vendors to formally pitch their solutions.

"The sooner we bring these technologies to market, the sooner we can introduce them to our fleet, and reduce emissions," Rio Tinto's lead for the challenge John Mulcahy said.

BHP and Vale project leads, Scott Davis and Mauricio Duarte, both praised the industry's collaborative work and interest in reducing haul truck emissions.

Vale has committed to net zero scope 1 and 2 emissions by 2050, as have other mining majors including Barrick Gold.

Barrick Gold is also a patron of the Charge On Challenge, although CEO Mark Bristow warned this week investors' current focus on emissions shouldn't be at the expense of other aspects of ESG.