The trays of the trucks at the mine have been painted pink and blue in the colours of the National Breast Cancer Foundation and the Prostate Cancer Foundation of Australia.

Peabody CMJV general manager Albert Scheepers said the trucks would serve as constant conversation starters about men's and women's health issues on-site.

"Sadly, we all know someone whether friends or family members who have been affected by breast or prostate cancer and I hope we've built a compelling reminder of the importance of scheduling regular checkups with a health professional," he said.

"Safety is a core value of our company and we're confident these activities will stand out across the operation and help bring some much-needed awareness to prevalent cancers in our communities."

Scheepers said the two haul trucks were part of a fleet of six Komatsu 930 E-5s coming online at CMJV to improve fuel efficiency, increase hauling capacity, reduce noise and improve amenity for operators compared to the older fleet.

The Komatsu 930-E5 trucks each weigh 521 tonne and have a 304t payload.

CMJV maintenance administrator Kristie Pelleri has turned the initiative into fundraising activities for medical research.

"People are reluctant to talk about their health but we plan to build partnerships with each foundation and share information about their services with our workforce and we've already started fundraising activities," she said.

In October and November, Peabody raised money for the National Breast Cancer Foundation and the global Movember Foundation.

Movember partners with the PCFA in Australia to fund prostate cancer research.