See this link for useful info on warrants, including their treatment in the event of a take-over:-

http://canadianwarrants.com/faq.html

2. What happens to the warrant if the company get taken over?Warrants remain the securities of the company and have to be treated fairly according to securities legislation. Eg. when Kinross took over Bema Gold the warrants started trading under the Bema Gold warrants started trading under the symbols K.WT.A and K.WT.B