Mayo Lake Claims Groups, Yukon Territory

Trail-Minto Claim Group

The Trail-Minto claim group is composed of 179 contiguous quartz claims covering an area of 19.9 square kilometres near the community of Mayo, Yukon, Canada on NTS map sheets 105M 12/13. The claim group is over 15 kilometres long and covers the highlands west of Silver Trail and south of Mouth Haldane.

Access to Trail-Minto is provided by two pre-existing seasonal roads that cut across the northern and southern edges of the claim group. The roads connect to the Silver Trail Highway, 2.5 kilometres east of the property. The entire claim group is easily accessed via helicopter from the airport in Mayo.

Trail-Minto covers the highlands stretching from Ross Creek and Black Creek in the north to the highlands south of the valley that contains Minto Creek. South of Trail Creek, most creeks have narrow valleys with moderate to steep slopes and ridge crests are broad with moderate slopes. North of Trail Creek, valleys are steeply incised and ridge crests are narrow. Creeks draining the property are all part of the Yukon River watershed.

The area has been subjected to multiple glaciations (Hughes 1983). It lies beyond the western limit of the most recent Pliestocene glaciation, the McConnell Glaciation, whose western margin covered the low slopes immediately east of the property. During the older Reid Glaciation, Minto Creek and Black Creek were filled with fast, westward-flowing ice. Minto Creek is now filled with glacial drift and alluvium. The uplands within Trail-Minto were covered by glacial ice during the Reid Glaciation. Their surface is composed of a mixture of colluvium and till. Due to the elevation of the upland, the ice was probably cold-based and transport of rock and debris was minimal as is evidenced by landforms. The preservation of cryoplanation terraces as noted nearby within the limits of the Reid Glaciation suggests little glacial erosion here. Patches of buried colluvium and alluvial benches may be representative of the Reid and older Pleistocene glaciations.

Trail-Minto is underlain by phyllites, schists and carbonates of the Hyland Group metasediments occasionally intruded by felsic dykes. The Roaring Fork Stock underlies the south part of the Trail-Minto claim group and has a similar age to the Tombstone Intrusive Suite (Figure 9). Most stratigraphy has bedding parallel or sub-parallel to foliation, which generally dips shallowly southeast except where modified by small scale isoclinal folding. Outcrop is sparse on the property, rarely exceeding 5 per cent in any area. Soil development is immature.

Figure 9: Gold in soil anomalies paralleling Roaring Fork Stock on Trail-Minto

Historical placer mining on two creeks draining from Trail-Minto has occurred — Roaring Fork Creek draining the southern portion of the property and Ross Creek draining the northern part of the property.

MLM delineated numerous geochemical targets from ridge and spur sampling. It contains over half of MLM’s anomalous Au in soil samples (>25 ppb) from its 2012 program of over 3000 geochemical samples. These geochemical targets cluster along the edges of the Roaring Fork Stock. Noteworthy anomalies with some apparent length parallel the Stock’s eastern boundary. Follow-up sampling such as systematic bedrock interface sampling will be needed to further define the tenor and full extent of these linear anomalies because of alluvial reworking and channelizing of gold-bearing sediment and bedrock on the slopes.

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