CEO Michael Byron said Monday results from the latest four holes extended broad uniform zones of mineralisation to new depths below the current resource area.
The Toronto-headquartered company said results from Zone 2 included 155m averaging 1.36 grams per tonne gold starting at 284.3m downhole; and 135m at 1.5g/t from 340.2m. The mineralisation has been traced deeper towards Zone 2.5, at about 320m vertical depth, where notable intercepts included 34.5m at 1.85g/t starting at 278m.
"Drilling success to date has further strengthened resource expansion opportunities by confirming the presence of broad and extensive zones of mineralisation that increase in true width to depth where it remains open in most dimensions," Byron said.
Nighthawk has completed 29 holes at Colomac this year, for which assays have been released for 17. Results are also pending for 15 holes completed at Treasure Island, 11km north-northwest of Colomac.
The two holes completed at Zone 2 were within its northern portion, targeting areas beneath a historic pit, 40m south of a previously drilled section.
Nighthawk released an updated resource for Colomac in July, outlining 1.7 million ounces grading 2.01g/t indicated and 372,500oz at 2.03g/t inferred.
It plans to follow up this year's 22,993m of drilling with 75,000m in 2021.
Indin Lake is about 200km north of the territorial capital Yellowknife. Centrally positioned on the property, the Colomac Main deposit is a past producer, putting out 527,908oz during intermittent operations between 1990-1997.
Shares in the company (TSX:NHK) last traded 5% lower at C$1.26, capitalising it at $65 million (US$50.5 million).