Emmerson Resources (ASX: ERM) up 15% yesterday as it added 99,000 high-grade oz to its 900,000 oz resource base in the NT. The share price increase reflects growing optimism with respect to the potential commerciality of the company's resource base at Tennant Creek. The high-grade ounces provide an early source of high-grade ore to the company's Warrego CIP mill, thus boosting project economics. The potential to expand both open-pit and underground resources is high.