Analysis of fracturing in hole UG-2 Spent Fuel Test-Climax

Detailed fracture logging and analysis of the UG-2 core from the Climax Stock is reported. This borehole is about 183 m long (600 ft) and slants downward below the Spent Fuel Test workings, thus representing the only sampling of the quartz monzonite at depth. An effective means of orienting the core sections relative to a certain joint set of known orientation is demonstrated, and a computational procedure for accomplyishing this in non-vertical boreholes is presented. Although this core orienting scheme is approximate, modal joint set orientations could be estimated. A distinctive low-angle joint set which pervades the existing workings is the most frequently encountered set at depth, and its spacing distribution is shown to be negative exponential. The next common joint set in the core strikes northeasterly and dips steeply to the southeast. Another set strikes northwesterly and is nearly vertical. These groupings generally agree with results of previous surveys in the area, which suggests the rock mass is homogeneous in terms of its joint pattern. 13 references, 25 figures, 2 tables