If anyone is wondering about the 6% drop today, Goldman Sachs downgraded MDL to neutral and lowered its price target to 4.45. The article below gives a bit of background. I have just bought some as I think the drop may be a bit overdone, which seems to often happen to stocks with such heavy bot trading.
http://www.businessspectator.com.au/bs.nsf/Article/market-mineral-sands-Goldman-Iluka-Resources-Base--pd20121114-ZZVVE?OpenDocument&src=sph