Volatility remains in the energy market as Nymex crude oil dropped 5.26% to US$46.13 per barrel in New York few hours ago. Shares of coal producers were dragged down accordingly, led by Arch Coal and Peabody Energy, which fell 7.32% and 2.13% respectively. Spot coal from Newcastle, Australia, meanwhile, collapsed 5.2% to US$58.6 per ton late last week, the lowest price since June 2007. To subscribe please click here