Feb 25 (Reuters) - Sierra Mining Ltd
* RTG Mining Inc to merge with Sierra Mining Limited
* Deal to combine two companies at agreed exchange ratio of 3 RTG shares for each Sierra share held; plus 1 RTG option for every 3 sierra shares held
* Says RTG Mining and co entered into conditional scheme implementation deed to combine the two companies
* RTG options will be exercisable for a period of three years at an exercise price of C$0.15
* Source text for Eikon
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