elephant
n.— «Vale threw a party in Ulan Bator with samba dancers flown in from Brazil to mark the company’s arrival in Mongolia to search for another “elephant”—mining parlance for a big discovery.» —“Ivanhoe Seeks Riches Selling Output of Mongolian Mine to China” Bloomberg.com Oct. 27, 2004. (source: Double-Tongued Dictionary)
Further reading
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