Los Angeles: Veteran actor Peter Mullan and Rebecca Lucy Taylor are set to feature in Mountain.
The film also stars Iwan Rheon, known for Game of Thrones. It is directed by Celyn Jones, whose credits include The Almond and the Seahorse, starring Rebel Wilson, and Madfabulous, among others.
The film is set to be shot in Anglesey, North Wales, according to entertainment news outlet Variety.
The film is set in 1980s Wales, where GG (played by Seth Isaac Thomas), a neglected young boy, is searching for friendship and community. Mullan plays Bill, who lives in isolation on the mountain.
"Their lives collide by chance, forming a brief but enduring connection, proving that even though the world can appear cruel, life is inherently good and will find a way to survive," reads the official logline.
"When I read the script, I emailed Celyn and said, 'You made me cry, I'm in.' It will be great for us to work together again and in such a beautiful part of the world too," Mullan said in a statement.
Jones said that although the film is fiction, it is deeply personal as it carries emotional themes and humour.
"I'm honoured to bring a world-class team, on both sides of the camera, to my home town of Holyhead on Anglesey. I'm really looking forward to bringing it to life and sharing the cinematic beauty of home with the world," he said.
The film is produced by Nadia Jaynes, Sean Marley and Rachel Richardson-Jones. Paul Baker is serving as an executive producer.