Court Won't Halt Arch Coal's Triton Bid  WASHINGTON (Reuters) - Arch Coal Inc &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=ACI.N target=/stocks/quickinfo/fullquote"&gt;ACI.N&lt;/A&gt;. on Friday  pressed forward with its acquisition of rival Triton Coal Co.  LLC after a U.S. appeals court denied an emergency request by  antitrust authorities to block the deal.