Dec 20 (Reuters) - Mammoth Resources Corp MTH.V :
* MAMMOTH ENTERS OPTION AGREEMENT WITH CENTERRA GOLD ON ITS TENORIBA PRECIOUS METAL PROPERTY, MEXICO
* MAMMOTH RESOURCES - CENTERRA HAS OPTION TO EARN UP TO A 70% INTEREST IN TENORIBA UPON TOTAL PROJECT EXPENDITURES OF US$9.0 MILLION OVER A SEVEN-YEAR PERIOD