The junior has signed an option over the Humboldt Range prospect comprising two groups of lode claims "neither of which has been extensively explored using modern techniques".

PolarX said Humboldt Range is between two large active precious metal mining operations, namely Florida Canyon and Rochester.

"Gold occurs in swarms of 5cm to 1.5m wide epithermal quartz veins and their alteration haloes," the explorer said.

"Structural corridors between 30m and 275m wide contain numerous (in some cases hundreds) of mineralised quartz veins (with) these zones represent(ing) potential bulk mining targets."

PolarX has paid US$35,000 for the option which it can exercise by paying a further $175,000 (in stages) and issuing five million shares to the vendor.

The option over ground in Nevada comes as PolarX enters its seventh year of exploration in Alaska, with the company looking to both outline development scenarios in its own right and farm out porphyry copper-gold tenure to majors.

PolarX will likely need to undertake a fundraising in the short term given cash at the end of September of A$2.2 million.

Shares in PolarX were down 9% to 3.9c in morning trade, capitalising the company at $42 million.