Pahute Mesa is one of four major nuclear test regions within the Nevada National Security Site (NNSS). It occupies 243 square miles (630 km2) in the northwest corner of the NNSS in Nevada. The eastern section is known as Area 19 and the western section as Area 20.
Pahute Mesa was seen as ideal due to its geology and distance of over 160 kilometres (99 mi) from Las Vegas. Holes can be drilled to a depth of more than 1,370 metres (4,490 ft). This allows tests in the megaton range to be fully contained with minimal ground motion being felt in Las Vegas.
Geology and Climate 
Pahute Mesa is part of the Tonopah Basin and includes the Silent Canyon caldera complex of the Southwest Nevada volcanic field.
Rugged terrain features and harsh winter conditions make year-round operations difficult.
Nuclear Testing 
A total of 85 nuclear tests were conducted in Pahute Mesa between 1965 and 1992. Three of them—Boxcar, Benham and Handley—had a yield of over one megaton. Three tests were conducted as part of operation Plowshare and one as part of Vela Uniform.
In 1988, as a prelude to the signing of the protocols to the Threshold Test Ban Treaty and the Peaceful Nuclear Explosions Treaty, the United States and the Soviet Union conducted two joint tests employing proposed treaty verification techniques. The first was Kearsarge, conducted in Area 19 of the NNSS, the second Shagan, conducted at the Semipalatinsk Test Site.
Shot Greenwater was planned for 1993 and abandoned in place in Area 19 following 1992's testing moratorium.
Radioactive contamination 
The following tests resulted in a release of radioactivity that was detected outside of the NNSS.
|Test||Date||Type||Purpose||Location||Atmospheric release of iodine-131|
|Palanquin||1965-04-14||Crater||Plowshare||Area 20||910 kilocuries (34 PBq)|
|Cabriolet||1968-01-26||Crater||Plowshare||Area 20||6 kilocuries (0.22 PBq)|
|Schooner||1968-12-08||Crater||Plowshare||Area 20||15 kilocuries (0.56 PBq)|
The Schooner plume spread plutonium and other radionuclides across Area 20 and northward into Nellis Air Force Range. According to measurements taken in 2001, the Schooner crater has the highest annual mean concentration of radioactive tritiated water of any area of the NNSS.
Other uses 
The Schooner crater area resembles the lunar landscape. It was used along with other areas of the NNSS to train some of the astronauts of the Apollo program, among them Neil Armstrong, Dick Gordon, Buzz Aldrin, Dave Scott and Rusty Schweickart. In 1970, the Apollo 16 team trained at Schooner in the lunar rover.
Supporting Infrastructure 
The Pahute Control Point is located in Area 18, south of Pahute Mesa. It was used until 1971 to monitor tests in Pahute Mesa.
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