** Shares of diversified miner South32 S32.AX fall as much as 5.1% to A$2.950, posting their biggest intraday pct drop since April 9

** Stock hits its lowest level since July 1

** Miner flags impairment to its Mozal aluminium smelter in Mozambique

** Says production under review because it has not been able to secure affordable power prices after March 2026

** YTD, S32 shares down 12.4%

(Reporting by Nichiket Sunil in Bengaluru)

((Nichiket.Sunil@thomsonreuters.com;))