This handbook is for the engineer or person responsible for the storage and removal of material from bins and silos in the minerals industry. The objective of the handbook is to prevent bin-related accidents by eliminating problems that require workers to enter bins. It provides basic information on handling materials so that knowledgeable decisions can be made on bin design and accessories to minimize flow stoppages. Materials are classified in terms of their flowability, and bin design and accessories are suggested for each classification. A method for classifying a material is also given, and the various types of material flow aids are reviewed. Safety around bins is the basic theme of the handbook. Federal regulations are reviewed, and additional suggestions are presented to prevent bin accidents. New equipment for releasing material hangups is reviewed.