The company describes Miller, which lies 18km south of Kirkland Lake Gold's Macassa mine, as "a Macassa/Sigma/Lamaque lookalike".
It said its recently completed phase one drill programme had not only expanded the near-surface, high-grade gold mineralised zone but also discovered additional near-surface zones, indicating the potential to define NI 43-101 compliant bulk tonnage mineralisation.
"We look forward to a substantial phase two drill programme this Fall to significantly enlarge this zone, further test the Planet and Meilleur Syenites and other newly-defined high-grade exploration targets associated with the main, as-of-yet untested Catharine Fault First Order feeder structure," president and CEO Brian Fowler said.
The company also engaged GoldSpot Discoveries to process its geophysical data and augment its efforts to define deeper drill targets.
Northstar started exploring Miller in 2012.
In 2016, it mined a 932 tonne bulk sample from the historical Vein 1 which averaged 5.1g/t gold and had a 95.75% gold recovery in custom milling using cyanide leach.
The Kirkland Lake district-focused explorer operated as a private company for 11 years, before listing in January on the Canadian Securities Exchange after closing a C$3 million IPO at 30c per share on December 31.
It raised almost $1 million in March in a placement at 29c per unit.
Its shares (CSE: NSG) closed up 9.59% yesterday to 40c, capitalising it at $14 million (US$31 million).