Traditional Owner ranger programs in Karijini and Millstream Chichester National Parks have been bolstered by an $8 million investment.

The five-year funding initiative from Rio Tinto, in partnership with Western Australia's Department of Biodiversity, Conservation and Attractions, for the Pilbara Conservation Project will support and enhance conservation land management.

Areas of high conservation value would be protected with assistance from Traditional Owners, whose knowledge of the land would guide land management at the parks.

Feral animal control and weed and bushfire management at Karijini, Millstream Chichester and other sites across the Pilbara with high conservation value would occur via the new Pilbara Conservation Strategy.

Enhanced ranger training and paid service work for Aboriginal ranger groups were also initiatives of the new project.

Karijini National Park is Pilbara's key tourist attraction, with more than 300,000 visitors annually.

The new project complements several partnerships Rio Tinto has with Traditional Owners on Aboriginal ranger programs in the Pilbara, including the Pilbara Ranger Network and other conservation-based initiatives with Indigenous corporations.

Rio Tinto, DBCA and Traditional Owners have together protected the Karijini and Millstream Chichester National Parks since 2015.

Rio Tinto health, safety, environment and communities vice president, Cecile Thaxter said the project put Traditional Owners and their knowledge at the heart of conservation management for the culturally and economically-significant region.

"Maintaining Pilbara biodiversity is critical, not only for our business today but also for future generations within the region," she said.

"We recognise our responsibility to understand and effectively mitigate our impacts on nature through collaborative partnerships.

"Partnerships like the Pilbara Conservation Project are crucial to delivering nature-positive outcomes, with collaboration, resource sharing, innovation, local engagement and collective effort needed to address the complex challenges with environmental conservation and restoration."

Environment minister Reece Whitby MLA said conservation was a shared responsibility.

"This new partnership demonstrates how government, industry and Traditional Owners work together to manage biodiversity values through practical on-ground actions," he said.

"The Pilbara is a special place, and its habitat is home to species of animals and plants you can't find anywhere else in the world."