Mayo Lake Claims Groups, Yukon Territory

Carlin and Roop

The Carlin and Roop claim groups are composed of 139 contiguous quartz claims covering an area of 27.7 square kilometres east of the community of Keno on NTS map sheet 105M15. The claim groups are divided by Granite Creek, host to an active placer operation north of Mayo Lake.

The claim groups cover the eastern reaches of the Gustavus Range between the valley containing the Keno-Ladue River to the north and Mayo Lake to thesSouth. The Gustavus Range is bisected east to west by the Granite-Keystone Creek valley. Several cirques are present in the Gustavus Range. Peaks are generally rounded with steep drop-offs or cliffs at the lips of valleys. The Roop claim group is drained to the north by McKim Creek and to the south and east by Granite Creek. The Carlin claim group is drained to the north and east by Granite Creek and to the south into Mayo Lake. Tributaries to Mayo Lake are narrow and confined by moderate to steep slopes.

The Property has been subjected to multiple glaciations (Hughes 1983). The youngest Pleistocene glaciation, McConnell Glaciation, was confined to the trunk valleys occupied by Mayo Lake and the Keno-Ladue River and Granite Creek (Bond 1999). Except for the valley occupied by Granite Creek, these valleys were filled with westward fast-flowing ice that scoured their bottoms and sides. During the McConnell Glaciation, ice moved up Granite Creek where it terminated. This ice was probably cold-based, resulting in minimal erosion within the Granite Creek valley. The upper limit of the McConnell Glaciation is partially marked by lateral moraines and kame terraces. Within the limit of the McConnell glaciation most of the terrain is covered by variable thicknesses of till (Hughes 1983). During the earlier Reid Glaciation, ice flowed west over the divide to Keystone Creek and was probably more erosional in the Granite Creek valley bottom.
Hughes, O.L. 1983: Surficial geology and geomorphology, Mount Edwards, Yukon Territory, Geological Survey of Canada Map 5 — 1982.

Carlin and Roop are underlain by Keno Hill Quartzite interlayered with minor andesitic volcanics and intruded by Triassic gabbros and the Cretaceous Roop Lakes Stock. A contact metamorphic aureole extends up to 4 kilometres away from the stock impacting most units underlying the properties. Outcrop is uncommon on the properties, mostly occurring along scarps above glacial valleys. Soil development is immature and extensively cryoturbated.

Granite Creek was historically prospected for placer potential, but until recently was overlooked by modern placer operators. Beginning in 2013, a placer operation has been active and pockets containing up to 300 ounces of gold have been mined. Many of the tributaries to Granite Creek have been staked for additional placer potential. The placer operation on Granite Creek can be accessed by a road originating in Keno. This road connects to the Silver Trail Highway at Keno. The uplands are accessible via helicopter from the airport in Mayo.

MLM delineated several geochemical targets from ridge and spur sampling of these claim groups (Figure 10). The geochemistry and a follow-up SGH survey has indicated potential for Au bearing veins, copper of unknown provenance and for Keno Hill type Ag-Pb veins. The gold anomalies appear to be related to N-S lineations and flexures to these lineations as defined by the airborne magnetics.

Figure 10: Geochemical results from sampling of Carlin and Roop claim groups.


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