Chromite occurrences in poorly exposed Ultramafic rocks in the Kaiyuh Hills area, west-central Alaska, were investigated. This report describes the local geology, chromite occurrences, and results of chemical analyses on 32 samples and metallurgical tests that were performed on 4 deposits in the area. Total estimated reserve potential for the four deposits is between 17,000 and 37,000 tons of contained cr2o3. One 3-ft-wide nearly massive band that contains between 50 and 60 pct chromite is estimated to have a strike length of almost 300 ft. This deposit is estimated to contain between 2,000 and 5,000 tons of cr2o3 in high-chromium chromite. Numerous other low-grade occurrences with between 3 and 10 pct chromite contain discontinuous bands up to several inches wide over areas measuring tens of feet wide and up to several hundred feet long. Three of the larger low-grade occurrences that contain between 3 and 4 pct chromite are estimated to contain between 15,000 and 32,000 tons of cr2o3 in high-chromium and high- iron chromite. Potential exists for additional chromite in buried occurences and in placer deposits in streams that drain the area.