Kazakh mining company Eurasian Natural Resources said the sudden jump in the price of its shares this morning "had nothing to do" with the firm.
The stock exchange cancelled a single trade, made at 8:05am, where ENRC shares were exchanged at £10.99, way above Friday's closing price of 841p.
The mining company dismissed any speculation about a takeover or the discovery of a new mine. Falling along with the rest of the resources sector, ENRC shares closed down 23.5p at 818p.