[en] This study was conducted between January 1983 and July 1983 and used assumptions and criteria available at that time. Subsequent data and criteria may supersede those used and may produce different results. The study evaluates the effects of two methods of waste canister emplacement on mining at the proposed nuclear waste repository in tuff. The two methods are the emplacement of waste canisters in vertical boreholes drilled in the drift floor and the emplacement of waste canisters in horizontal boreholes drilled in drift walls. This study considered several mine configurations for each emplacement method before one configuration for each method was selected as technically advantageous. Ventilation plans for each of the two configurations were also developed. The total mine cost for each method was estimated based on calculated manpower requirements, ventilation, and shaft and slope costs. In general, the horizontal emplacement method is considered superior to the vertical emplacement method in terms of lower costs, lower extraction ratio, and lower manpower requirements. Further study of multiple vertical canister emplacement, fracture orientation at the site, the type of mine opening cross section most suitable for the area, and ventilation requirements after emplacement is completed is recommended. 4 references, 8 figures, 12 tables