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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
In 2015, the US Army Corps of Engineers declared the mine structurally unsound.
Source: https://gizmodo.com/california-gold-rush-abandoned-mines-toxic-superfund-1850428984
“The US Army Corps of Engineers Far East District is here to deliver engineering solutions at these historic times for our two nations,” said Col. Heather Levy, FED commander, during the ceremony.