** Shares of Yancoal Australia YAL.AX fall as much as 8.1% to A$5.70, their lowest level since June 30

** Stock last down 5.2% at A$5.88; top loser on the S&P/ASX 200 .AXJO benchmark index, which is up 1.2%

** After markets hours on Thursday, coal miner posted quarterly attributable coal sales of 8.1 million tons (Mt), down 6% from a year before

** YAL reported A$142/T average realised coal price for Q2, down 22%

** Said FY attributable saleable production will potentially be towards upper end of its forecast range of 35-39 Mt

** About 5.2 million shares change hands, 1.3x 30-day average

** Stock down 9.9% YTD, including the day's move

(Reporting by Sherin Sunny in Bengaluru)

((Sherin.Sunny@thomsonreuters.com))