The success of Tanzania's structural reform efforts will (inter alia) depend on its ability to generate foreign exchange incomes. Mineral exports seem a promising source of such incomes. Tanzania is reportedly well endowed with minerals, with considerable developments already under way to explore them. Any attempt to make plans for the Tanzanian economy must take this into account. The present paper, which is part of the larger Macmod project, aims to make a contribution towards this end. It seeks to assess the prospects for mining developments in Tanzania during the next few years, and to propose a set of quantitative estimates indicative of these developments. In so doing the focus is limited to the standard economic variables of production and investments.