Canadian miner Teck Resources said it is selling its coal assets to a group led by mining and trading giant Glencore in a deal that would cap a lengthy saga and be one of the biggest in mining this year.

The transaction would value the business at around $9 billion. Under the terms of the deal, Switzerland-based Glencore will pay $6.93 billion for a 77% stake. Japan-based steelmaker Nippon will hold a 20% stake after converting existing holdings in some of Teck’s coal operations and paying cash, while South Korean steelmaker Posco will hold a 3% position after converting its holdings.