The Globe and Mail reports that Canadian Prime Minister Mark Carney told Anglo American that he would not approve its takeover of Teck Resources unless the company's combined headquarters were moved to Canada.The company evidently agreed to the condition as Anglo American announced it would relocate to its head office to Vancouver if the all-stock bid was successful. However the company would remain domiciled in the UK.Key for Teck shareholders on this report is that it will make it tough, if not impossible, for other large mining companies to buy the Canadian copper giant.With Mr. Carney insisting that any potential suitor for Teck move its headquarters to Canada, the chances of other bidders surfacing appears to be low. Other previously speculated suitors for Teck, including BHP Group Inc., Glencore PLC, Vale SA, and Freeport-McMoRan Inc., all which have headquarters outside of Canada.Analysts at Scotia think the takeover is doomed anyway, as the premium for Teck shareholders is too low.Based on our ongoing discussions with investors, we believe that the proposed transaction under the current terms appears unlikely to succeed, as securing the minimum required Teck class B shareholder approval of 66 2/3 is likely to prove challenging. With a no premium bid, this investor discontent primarily stems from the unfavorable timing of this transaction from a Teck perspective and the resulting materially lower share of economics of the merged company at 37.6%/62.4%. Canada's Liberal government said in 2024 it would only allow for the takeover of critical miners companies 'in the most exceptional of circumstances'. Teck shares haven't reacted negatively to the latest report but the daily chart highlights how opportunistic the takeover is.The problem for Teck investors is that its flagship QB2 project in Chile has run into recurring problems and could be a lemon. The company plans a wide-ranging update on it in October, and the fear is that it could be permanently impaired.For the copper market generally, the struggles at QB2 highlight the difficulty in finding and developing large copper deposits. That adds to the bullish long-term case for copper. This article was written by Adam Button at investinglive.com.