The Bureau of Mines is investigating vanadium recovery from various domestic resources. A low-grade carnotite ore sample containing 0.34 pct v2o5 and 0.04 pct u3o8 was leached, and the results were compared with those of similar leach tests using a mill-grade sample containing 1.26 pct v2o5 and 0.19 pct u3o8. Experiments on the two ore samples included agitation leaching, pugging, salt-roast leaching, and autoclave leaching. None of the leaching methods investigated showed any significant advantage over another except autoclaving, which reduced the leach time but at the expense of greater acid consumption. Typical of the experimental results attained are the data gathered from the agitation leaching tests. Agitation leaching of the mill-grade ore with 100 lb/ton h2so4 resulted in extractions of 94 pct u3o8 and 33 pct v2o5. To increase the vanadium extraction from 33 to 91 pct required concentrations of 300 lb/ton h2so4 and 10 lb/ton naclo3. Complementary agitation leach tests on the low-grade ore required 200 lb/ton h2so4 to extract 94 pct u3o8, and 300 lb/ton h2so4 and 10 lb/ton naclo3 to extract 90 pct v2o5.