The Cu-Au-Ag deposits of the Carmacks Project, and the related Minto deposit, are considered rare examples of metamorphosed porphyry Cu systems (Kovacs et al., 2020).
The following section regrading the Carmacks Project mineralization has been modified from Kovacs (2018). Modifications have been made based on recent work by Granite Creek.
Mineralization of the Carmacks Copper Cu-Au-Ag deposit occurs within a 3 km–long, north-northwest trending belt that is separated into a northern Zone 1, 4 & 7, central Zones 2000S and southern zones 13 and 12.
Three different varieties of hypogene copper mineralization are recognized, with distinct mineralogical and textural characteristics: disseminated, foliaform, and net textured.
Disseminated copper sulphide mineralization is interpreted to be the least modified by metamorphism because it typically occurs in the undeformed metamorphic lithologies and augite gabbro. Disseminated chalcopyrite and pyrite comprise a minor portion of the hypogene mineralization and is typical in the undeformed, hornblende porphyroblastic amphibolite, granoblastic quartz-plagioclase-biotite schist, and augite gabbro. Disseminated copper sulphide minerals also occur in leucosome within the quartz- plagioclase-biotite schist unit. Chalcopyrite is typically fine-grained (0.3-0.7 mm) and occurs as anhedral to wavy, skeletal grains intergrown with also fine-grained (0.1 mm), minor subhedral pyrite.
Foliaform c ........