Plans to process ash and construction waste at a quarry in Devon are to go on display at a public exhibition held by the company behind the project.
The firm MVV Umvelt, which is building a new incinerator in Plymouth, wants to recycle ash from the city plant at Whitecleave Quarry in Buckfastleigh.
People nearby have raised concerns about increases in noise, plus whether the materials would be safe.
MVV Umvelt said materials being recycled would be inert and non-toxic.
MVV wants to build the quarry plant to turn the ash into material for road-building and other construction.
As part of the work, a small part of quarry would be filled in to create a plateau to build the plant on, MVV's managing director, Paul Carey said.
About 56,000 tonnes of ash a year would be taken to the plant.
The £140m contract to build in the incinerator in the Devonport area of Plymouth was awarded to MVV in January.
Neil Smith, from the Buckland Community Forum, said local people were concerned about the "potential for toxicity" of materials at the plant.
He added there were also concerns about how it would affect wildlife, including greater western horseshoe bats.
Mr Carey said no hazardous products would be handled.
He said: "It will be inert, non-hazardous, and it's perfectly safe to recycle in a facility like the one we're proposing."
The public exhibition is being held in Buckfastleigh Town Hall from 1500 BST to 1930 BST on Friday.