EY has rejected allegations about its auditors knowing of fake coal tests.
The allegations were aired again in a Senate inquiry about Peabody coal.
Peabody has also disputed the claims.
EY says it did not investigate the claims its auditors were tipped off about fake coal testing, partly arguing it relied on denials of problems from miner Peabody and testing company ALS.
Liam Walsh writes on investigations and companies with The Australian Financial Review. He has won multiple media awards, worked in Japan and is now based in Brisbane. Email Liam at liam.walsh@afr.com.au