PolarX (ASX:PXX) said it found high-grade gold mineralization during a recent drilling at its Humboldt Range Gold-Silver Project in Nevada, US, according to a Tuesday Australian bourse filing.

The results were of up to 9.1 meters at 6.38 grams per tonne grade of gold, including 1.5 meters at 37.29 g/t gold from 89.92 meters.

The company said that the mineralization starts from the surface and remains open with only 800 meters of the 3.6-kilometer-long anomaly drilled and remains open to the north-east, south-west, and at depth.

Silver assays from the same holes reported in the filing are pending.

The company expects further drilling to confirm that the vein system continues to "much greater" depths, and is now moving to implement a major follow-up drilling program to extend the known mineralization.