Abrasive wear on a wide variety of ferrous alloys has been studied in the nine major steps required to mine and concentrate mineral values from the large ore deposit at Climax, Colorado. Evaluation of relative wear resistance and service performance was by both full and small scale tests on components in the production equipment. Most rapid wear generally occurred under conditions of gouging abrasion. Rock drill bits, slusher scrapers, crusher liners, and grizzly screens are exposed to this type of abrasion. Intermediate wear rates, but with high metal consumption per ton of ore, occurred in grinding abrasion, as on grinding balls and ball mill liners. Relatively low wear rates were obtained under conditions of erosive or low-stress abrasion, as on mine car floor plates, rod-deck screens, some chute liners, sand classifier wear shoes, and parts exposed to wear by moving sand slurries. The classes of materials evaluated and their approximate order of decreasing abrasion resistance were: sintered tungsten carbides, martensitic white irons, martensitic high- and medium-carbon steels, austenitic high-carbon steels containing about six percent manganese, pearlitic highcarbon steels, austenitic steels containing 12 to 14 percent manganese, pearlitic white irons, and low-alloy quenched and tempered structural steels. For regular use in a specific application, the selection from candidate materials was based on cost-to-wear ratios, combined with ability to withstand the imposed impact or mechanical forces.