The design, construction and operation of a pilot plant are often important stages in the development of a project for the production of uranium concentrates. The main purpose of this guidebook is to discuss the objectives of a pilot plant and its proper role in the overall project. Since building and operating a pilot plant is very costly, it is important that such a plant be built only after several prerequisites have been met. This book discusses the rationale for a pilot plant and provides guidelines with suggested solutions for a variety of problems that may be encountered. Contents: 1. Introduction; 2. Process selection and design; 3. Basic engineering; 4. Project administration; Appendix I: Example of a uranium pilot plant; Appendix II: General and radiological safety; Annex: Basic data; References; Bibliography.