Abstract: The Sugar gold prospect, located 20 km southeast of the Coffee gold deposits in Yukon, is hosted in the mid-Cretaceous Dawson Range batholith, of which three mappable sub-units are recognized: a biotite hornblende quartz monzodiorite; a K-feldspar phyric hornblende biotite syenogranite; and a biotite hornblende diorite. Plutonic rocks are cut by steep, west to northwest-striking andesite dikes of uncertain age. Alteration and mineralized zones coincide with fault-fracture zones that are parallel and proximal to dikes and their margins. Alteration is characterized by an early phase of calc-sodic (albite-amphibole) and potassic (pervasive biotite and fracture-controlled K-feldspar) alteration and a later phase of silica flooding and sericite alteration. Gold mineralization is associated with disseminated sulphides in zones of silica flooding and with variably sheared veins of quartz-carbonate-arsenopyrite ± pyrite ± freibergite ± stibnite ± sphalerite. Late chalcedonic quartz-carbonate and ferroan carbonate veins mark the collapse of the hydrothermal system.

Authors: S.E. Bartlett, M.M. Allan, E.N. Buitenhuis, T.R. Smith and C.J.R. Hart

NTS Mapsheet(s): 115J14, 115J15

Citation: Bartlett, S.E., Allan, M.M., Buitenhuis, E.N, Smith, T.R. and Hart, C.J.R., 2016. Field investigations of the Sugar gold prospect, Dawson Range, Yukon (NTS 115J/14 and 115J/15). In: Yukon Exploration and Geology 2015, K.E. MacFarlane and M.G. Nordling (eds.), p. 1-16.

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