The Hearn craton encompasses diverse geological systems spanning 2.7 billion years and is host to various types of mineral deposits. Known mineral deposits, prospects, and mining operations includes mafic–ultramafic magmatic nickel-copper-cobalt-PGM, orogenic gold, BIF-hosted gold, volcanic-hosted copper-zinc-lead-gold-silver, unconformity-associated uranium prospects, and diamonds associated with Phanerozoic kimberlite.
The Ferguson Lake area covers an extension of the Yathkyed Greenstone Belt. This belt consists in a strongly deformed and gneissic suite of Archean supracrustal and intrusive rocks, and variably deformed Proterozoic plutons and dykes. The Archean gneissic rocks are intruded by granodiorites, quartz monzonites, and various mafic intrusions including diorites and gabbros. The oldest rocks in the southern and northeastern parts of the Ferguson Lake Project property are fine- to medium-grained amphibolites. These are the metamorphic products of the original mafic and intermediate volcanic rocks of Archean age.