This pamphlet has been compiled as a text to be used in the Arizona Bureau of Mine's extension lectures on "Prospector's Mineralogy." Many of the people attending these lectures, especially those most interested, have had very little, if any, technical training in mineralogy, chemistry, and allied sciences. For that reason this pamphlet has been written in as simple and non-technical language as the subject permits, yet the directions given are full enough so that anyone should be able to understand how to do the work. The method of procedure suggested to beginners in this line of work is first to practice each specific test for each metal on a mineral that is positively known to contain that metal or to practice the tests on a piece of that metal. This practice should be continued until the beginner becomes thoroughly familiar with the various tests for that metal as well as those for other metals. These tests can then be applied to ores of unknown metallic contents if it is desired to determine whether a certain metal is present. 29 p.