Tiltmeter Instrumentation for Deep Hole Operation
Final technical rept. 15 Jun-14 Dec 1972
LITTLE (ARTHUR D) INC CAMBRIDGE MA
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The report describes in detail two deep hole tiltmeter systems and their installation at Stone Canyon in Central California. The principal characteristics of the systems are tilt range, in excess of plus or minus 300 microradians. tilt resolution, better than 0.1 microradians. maximum ambient operating pressure, 5000 psi maximum ambient operating temeratiure, 75C minimum size of borehole, 6 in. I.D. cables supplied, seven conductors, double S.S. armor, 5300 and 2300 ft. One of the systems is installed at a depth of 1860 ft. in a borehole drilled into the granitic rock typical of the Gabilan Range formation the borehole is cased down to 1900 ft. and cemented to the formation. The other system is installed in a shallow borehole 40 ft. drilled into the overburden, within 100 ft. of the deep borehole.
- Economics and Cost Analysis
- Mining Engineering