Well, depends what you read.

This supports it.

http://business.financialpost.com/investing/teck-resources-ltd-antofagasta-plc-exploring-merger-sources/

"Both companies denied they are in merger talks, but Bloomberg reported that they held early-stage negotiations."

This shuts anything down.

http://www.cbc.ca/news/business/teck-resources-denies-report-of-merger-deal-with-chilean-miner-antofagasta-1.3015470

"Teck reports that it is not in discussions with Antofagasta in relation to any form of transaction"

Who to believe, one says Teck denies any disuccsion in relation to any transaction, IE SC was/is not talked about between the two, while Bloomburg claims they held early stage neogotiations.

Edit:

Another saying no discussions.

http://www.theglobeandmail.com/report-on-business/industry-news/energy-and-resources/teck-antofagasta-in-merger-talks-report/article23691647/

I would go with the there have been no discussions, but who knows. I really wonder how it all started.