In 1989-90, the Bureau of Mines appraised selected high-mineral- resource potential areas containing gold, rare-earth-element, or pegmatite deposits in or near the Black Hills National Forest. Available data were used to construct mine and mill models and to calculate discounted-cash-flow rate-of-return analyses. The economic feasibility of possible operations and the probability (nonmathematical) of exploration and development within the next decade were assessed. Exploration and development probabilities were forecast for the Lead-Deadwood, Galena, Rochford, Keystone, Medicine Mountain, Bear Lodge Mountains, Mineral Hill, Tinton, and Southern Black Hills pegmatite areas. This report summarizes a companion report (MLA 5-90).