Geology of the U12n. 02 (Midi Mist) drift, and postshot observations, Rainier Mesa, Area 12, Nevada Test Site
Mining of the Ul2n.02 drift for the Midi Mist event started on December 31, 1965, in Rainier Mesa, Nevada Test Site, and was completed on December 30, 1966. The drift was mined along a bearing of S. 65/sup 0/ W. at an altitude of 1,850.2 m (6,070.2 ft) to a length of 643 m (2,109 ft). The drift lies in tunnel bed 4 and penetrates stratigraphically up the section through sub-units 4AB, 4CD, 4E, 4F, 4G, 4H, and 4J, all of Tertiary age. Two faults mapped at the surface of the mesa were identified as having cut the complex at drift level. No engineering construction or support problems greater than minor rock slabbing, ravelly ground, or water inflow along fractures were uncountered. Visual inspection showed that shot-induced effects in the rock medium at drift level extended for 237.7 m (780 ft) from the working point in the form of fractures and small shear displacements along bedding planes.
- Research Organization:
- US Geological Survey, Denver, CO (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AI08-76DP00474
- OSTI ID:
- 5366939
- Report Number(s):
- DOE/DP/00474-T1
- Country of Publication:
- United States
- Language:
- English
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