This publication describes and evaluates a Standard Industrial Classification (SIC) based end-use data system for minerals that links the demand for minerals to economic activity in commercial uses. The new data system is two-dimensional. The first dimension of technical product classes (tpc's) measures the consumption of minerals in major primary intermediate products. The second dimension measures the consumption of these tpc's in sic end-use sectors in sufficient detail to identify the major determinants of demand for each tpc. Intercommodity comparisons are achieved at the level of SIC two-digit major groups. All available sources of information from government and industry can be utilized at minimum cost. This information will be supplemented with additional data to be obtained by modifying existing Bureau of Mines canvasses so as to elicit additional quantitative responses from mineral producers. The new data system is expected to improve significantly the ability to forecast demand for minerals, and provide an information base that would, for the first time ever, permit resolution of such questions as trends in substitution among materials and the intensity-of-use of materials in end-use sectors. For the 42 tpc's identified in the report, data are available for the new system from current sources or, except for three tpc's that require new canvasses, can be obtained by modification of existing Bureau canvasses.