Arch Coal and Peabody Energy collapsed 12.41% and 6.1% respectively in New York last night as WTI crude oil retreated by more than 3% to US$57 per barrel on Nymex. BHP Billiton followed with almost 2% fall in Sydney this morning. Rio Tinto and Whitehaven also down more than 1% each on ASX Wednesday.To subscribe please click here