The Rask occurrence is based on a map symbol indicating gold and silver mineralization, near the headwaters of Ottarasko Creek (Geological Survey of Canada Map 5-1968).

The area is underlain by overlap assemblages between the northeastern margin of the Coast Plutonic Complex and the Tchaikazan fault to the northeast (Geological Survey of Canada Open File 1163, Map 1713A). This area is charcterized by a complex belt of folds and imbricated, gently southwest-dipping thrust sheets (Geological Survey of Canada Open File 1163, Papers 88-1E, 89-1E; Geology 1991).

Very little information is available. A probable reference to the showing indicates that it comprises gold and silver-bearing veins in Lower Cretaceous sedimentary rocks and/or small intrusions related to the Jurassic to Tertiary Coast Plutonic Complex (Geological Survey of Canada Paper 68-33). The Lower Cretaceous unit that underlies the Rask appears to be the Cloud Drifter Formation which consists of siltstone, sandstone, greywacke and conglomerate. The MINFILE plot of the Rask shows a thrust-faulted package to the immediate east consisting of Lower Cretaceous Taylor Creek Group rhyolitic volcanics. Granodioritic stocks of the Tertiary to Paleocene Bendor suite intrude within a few kilometres west of the Rask showing.

In 2021, recent exploration work occurred at the Lori (092N 047), Langara (092N 036) and Lost Fiddle (092N 018) mineral occurrences which were held by Kinfisher Metals Corp as part of their Goldrange property, which also contained the Rask showing.

Refer to the Cloud Drifter prospect (new MINFILE in 2022) or Langara (092N 036) for related geological and work history details.