From Halopedia, the Halo wiki
Gold (pronounced /ˈɡoʊld/) is a a highly sought-after metal.
Due to its preciousness to humans, in 2552, a group of Orbital Drop Shock Troopers on New Jerusalem plotted to steal a large amount of gold bullion from a bank in Covenant-occupied Mount Haven. However, their plan was scuttled when they discovered a class of schoolchildren and their teacher hiding in the vault. An argument erupted amongst the Marines over whether or not the children should be allowed to live. The would-be thieves turned on one another and several were killed in a point-blank shootout. The children fled while one of the remaining Marines took the gold, several Forerunner relics, and a nuclear device. They then lured in the advancing Covenant and the traitorous Marines, and detonated the nuke, destroying it all.
Gold ore donated by the member nations of the East African Protectorate was to be used to erect a statue of John-117 in the United Nations Space Command Memorial Park in New Mombasa in commemoration of the Spartan's actions during the Battle of Mombasa.
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