Johannes Sittard, chairman and non-executive director of Kazakhstan-based mining giant Eurasian Natural Resources Corp (ENRC), has sold a quarter of his stake in the company to raise £1.68m.He offloaded 150,000 ordinary shares at 1,120p each, which leaves him 450,000 ordinary shares, equal to 0.035% of ENRC.Sittard began his career as an Assistant Professor at the Institute for Iron and Steel at a German university in the 1970s. Prior to joining ENRC in 2001, he was the president and CEO of Mittal Steel Company (then known as ISPAT International).While shares in the company dropped 1.3% Thursday, they have gained 12% over the last month.Top Director BuysFrontier Mining Ltd. (DI) (FML) Director name: Mr William D.R. EpplerAmount purchased: 500,000 @ 6.00p Value: £30,000British Land Co (BLND) Director name: Mr Clive Adam CowderyAmount purchased: 2,083 @ 531.00p Value: £11,061Top Director SellsEurasian Natural Resources Corp. (ENRC) Director name: Dr Johannes SittardAmount sold: 150,000 @ 1,120.00p Value: £1,680,000DDD Group (DDD) Director name: Mr Chris YewdallAmount sold: 250,000 @ 22.00p Value: £55,000