Kazakhstan-focused miner Eurasian Natural Resources Corp is the heaviest faller on further speculation of a major boardroom shake-up, as a result of indifferences with minority shareholders.On Wednesday, the group initiated a "comprehensive review of its corporate governance" which saw four board members leave with immediate effect. Now, according to a report in the Financial Times, Mehmet Dalman, an independent director of the board, could be set to resign.Providing more downwards pressure on the shares are falling copper, gold and silver prices, which are dragging down the share price of Anglo American and Rio Tinto also.Sector peer Lonmin is also in the red after UBS initiated coverage with a 'sell' and 1,500p target price, highlighting its concerns over the current cost environment.Heading the other way is speciality chemicals group Johnson Matthey, making gains of 2.7%.Oil and gas facilities provider Petrofac is edging lower after acquiring an additional 11.9% stake in Nigerian production and development firm Seven Energy International for $75m. Retailers Kingfisher, Marks & Spencer and Next and also on their way lower. FTSE 100 - RisersJohnson Matthey (JMAT) 2,039.00p +2.77%Essar Energy (ESSR) 436.30p +2.42%Pearson (PSON) 1,186.00p +2.15%ARM Holdings (ARM) 578.50p +2.12%Associated British Foods (ABF) 1,066.00p +1.91%Glencore International (GLEN) 522.60p +1.48%G4S (GFS) 287.20p +1.34%Carnival (CCL) 2,342.00p +1.25%Aggreko (AGK) 1,957.00p +1.19%Weir Group (WEIR) 2,073.00p +1.12%FTSE 100 - FallersEurasian Natural Resources Corp. (ENRC) 772.00p -3.74%Smiths Group (SMIN) 1,143.00p -1.55%Kingfisher (KGF) 269.80p -1.53%ITV (ITV) 66.10p -1.20%Marks & Spencer Group (MKS) 363.50p -1.17%AstraZeneca (AZN) 3,138.50p -1.13%Next (NXT) 2,230.00p -1.06%Anglo American (AAL) 2,959.50p -0.97%Admiral Group (ADM) 1,732.00p -0.92%HSBC Holdings (HSBA) 616.10p -0.90%