File:NTS - Big Hole Drilling 012.jpg

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Drill Yard located at the junction of Pahute Mesa Road and Tippapah Highway in Area 1. This area contains drill equipment used to bore large diameter shafts for underground tests. During the period 1961 to 1992, a total of 1.5 million feet (280 miles) of 36-inch-diameter holes were drilled at the Nevada Test Site. Big Hole drilling (holes larger than 36 inches in diameter) was essential for the nation's nuclear testing program. Holes as deep as a mile were drilled to accommodate

large diagnostic packages. Some diagnostic packages were as long as 200 feet. To prevent the package with the test experiments from binding or catching on the sides of the hole, it had to be drilled straight. This was achieved with a drilling assembly weight (pictured) of 160,000 pounds. 10,000 pounds was supported by the bit and 150,000 pounds was suspended by the drill pipe to keep the hole straight.
Source Nevada Test Site Guide, DOE/NV-715
Author Federal Government of the United States
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Public domain This image is a work of a United States Department of Energy (or predecessor organization) employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.

Please note that national laboratories operate under varying licences and some are not free. Check the site policies of any national lab before crediting it with this tag.

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current15:47, 2 September 2012Thumbnail for version as of 15:47, 2 September 2012515 × 746 (86 KB)Bomazi (talk | contribs){{Information |Description=Drill Yard located at the junction of Pahute Mesa Road and Tippapah Highway in Area 1. This area contains drill equipment used to bore large diameter shafts for underground tests. During the period 1961 to 1992, a total of 1....

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