The Chagai Hills is a granite mountain range located in the Chagai District in Balochistan, Pakistan. The Chagai Hills face the border wall at the Durand Line– the official name of Afghanistan–Pakistan border.
The highest peak, Malik Naru, at the Chagai Hills is measured at and is a site of volcanic Koh-i-Sultan.
The Chagai Hills terrain is mostly consists of dry desert and located in the northernmost area of Chagai District at the international Durand Line– the official name of Afghanistan–Pakistan border. The region where Chagai Hills are located is reported by the extremely dry with no prospect of water, which the GSP conducted a survey in search of water in 1975.
The Chagai Hills are stretched over an area that is approximately and wide. The highest peak, Malik Naru, at the Chagai Hills is measured at and is a site of volcanic Koh-i-Sultan.
The Pakistani investigations discovered the occurrences of copper, iron, zinc, molybdenum, sulfur, and limestones, the travertine, which is an interest of economic importance. The geological survey to explore uranium was also conducted in the region in 1957.
The Chagai Hills are continuous subject of interest of Volcanology which the Geological Survey of Pakistan (GSP) has commissioned its studies in a joint venture with the United States since 1997. The Koh-i-Sultan (lit. Mountain of the King) is a prominent site where its activity has provided scientific opportunity to the Pakistani seismologists and volcanologists. The fission carbon dating studies were first conducted on rocks and geological structure in 1997, which provided the age of Chagai Hills in Miocene-Late Pleistocene period.
The temperature in Chagai Hills is noted to be extreme with summer being very hot and Desert climate. In 2019, the Pakistan Meteorological Department (PMD) reported the average minimum temperature in January, and the average maximum temperature is in July.
With Pakistani administrations following the policy of deliberate ambiguity, the Chagai Hills were continuously suspected as a nuclear test site by the Western media outlets. Despite widely international media reporting and the local anti–nuclear protests being staged, there has been no radioactivity nor any nuclear weapon test activity that has ever taken place in the Chagai Hills albeit scientific studies on volcanology and hydrology.Rai Muhammad Saleh Azam, “When Mountains Move—. The Story of Chagai,” Defence Journal, June 2000
The Ras Koh Range is the official Ministry of Defense range and designated nuclear test site where the nuclear weapon testing took place in 1998. A structural depression actually separates the Ras Koh Hills from the Chagai Hills— the Ras Koh Hills are actually located on the border of Chagai District and the Kharan District. The confusion is attributed in reporting due to the Pakistan's MoD codenamed the tests as Chagai to maintain secrecy at the actual weapon testing venues.
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