EL DORADO, Arkansas, April 25 (Reuters) - Deltic Timber Corp. DEL.N , which harvests timber and sells lumber, said on Thursday it is evaluating strategic alternatives for its 50 percent stake in fiberboard maker Del-Tin Fiber LLC. Deltic, which is based in El Dorado, Arkansas and owns about 400,000 acres of timberland in Arkansas and Louisiana, said it hired Banc One Capital Markets as a financial adviser. Del-Tin is a joint venture between Deltic and Austin, Texas-based Temple-Inland Inc. TIN.N , a Deltic official said. Shares of Deltic were down 10 cents to $32.75 in afternoon trading on the New York Stock Exchange.