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The mines were also used by the U.S. during the Battle of Khe Sanh; however, a U.S. Air Force history described them as being "little more than a nuisance," due to the Viet Cong clearing the gravel mine fields by using teams of oxen that dragged logs over them and to the mines themselves becoming inert after a short time.
A draft mining plan for bauxite was approved by the Vietnamese government in 2007. Vinacomin, a Vietnamese mining company, has laid out a plan for 6 bauxite mining projects covering over 1800 square kilometers in Vietnam's mountainous Central Highlands.
The M14 mine blast-type anti-personnel mine used by the United States during the Vietnam War was known as the "toe popper." [2] Earlier examples of the toe-popper were the Soviet-made PMK-40 [3] and the World War II "ointment box." [4] The United States also used the M16 mine, a copy of the German "Bouncing Betty".
Vinacomin operates within many different sectors, such as coal exploitation, processing and selling, explosive and cement production, shipbuilding, automobile manufacturing, tourism, hotels, financing, services and power generation in thermal power plants, including the Cao Ngan thermal power station (the main contractor being China's Harbin) and Na Duong thermal power station (the main ...
Officially, the mine is closed, but illicit artisanal uranium mining has continued, though who is buying the uranium is not publicly known. [50] Beginning as a large open pit copper mine in 1924, the Kipushi Mine eventually became an underground producer of zinc, germanium, and silver. Closed since 1993, the owners of the mine plan to restart ...
Hexamethylenediamine was first reported by Theodor Curtius. [4] It is produced by the hydrogenation of adiponitrile: . NC(CH 2) 4 CN + 4 H 2 → H 2 N(CH 2) 6 NH 2. The hydrogenation is conducted on molten adiponitrile diluted with ammonia, [5] typical catalysts being based on cobalt and iron.
Operation Pocket Money was the title of a U.S. Navy Task Force 77 aerial mining campaign conducted against the Democratic Republic of Vietnam (North Vietnam) from 9 May 1972 (Vietnamese time), during the Vietnam War.
N-(1-Naphthyl)ethylenediamine dihydrochloride is widely used in the quantitative analysis of nitrate and nitrite in water samples by colorimetry.It readily undergoes a diazonium coupling reaction in the presence of nitrite to give a strongly colored azo compound.