While lining up pins for a stiff arm on a CAT D-10 dozer, the pry bar being used slipped and the miner fell foward striking his right ear and right jawbone on truck outrigger. Miner was given an icepak and said he would continue working. Miner did not seek medical attention until MAY 02, 2009. Miner did not miss any work between March 25, 2009 thru May 05, 2009.