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Revised geological map of Mount Nansen area (NTS 115I/3 and part of 115I/2)
This map presents a compilation and re-interpretation of the bedrock geology in the Mount Nansen area. The Mount Nansen porphyry district is herein defined as the area of historic placer gold and hard rock gold-silver production centred on the headwaters of the East Fork of Nansen Creek. The majority of MINFILE occurrences in the district are within a 12 x 6 km, northwest elongate area (Hart and Langdon, 1997) shown at 1:20 000 on sheet 2. In the northwestern part of the district, vein and porphyry mineralization was related to Late Cretaceous porphyritic rocks of the Casino and Prospector Mountain suites. Mineralization in the southeastern part of the district appears to have been primarily related to Early Cretaceous porphyritic dikes and plugs. Our mapping is combined with previously undigitized 1:30 000 (published at 1:50 0000) bedrock mapping. Geochronological data are from this study, Lee (2021) and the Yukon geochronology database (YGS, 2020b). The location of approximately 20 samples in YGS (2020b) were modified based on field checks and location notes in the database; geochronological samples which could not be confidently located are omitted.
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Goulter Property, central Yukon
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This property, which adjoins the Mt. Nansen property on the north side, is bisected by Discovery Creek, a significant placer gold producer. Two parallel zones of anastomosing quartz veins and porphyry dykes cut Cretaceous intrusive rocks and contain variable amounts of gold and silver over substantial widths. The two mineralized zones lie approximately on trend with the Brown-McDade and Webber-Huestis zones on the Mt. Nansen property to the south, and with gold and silver-bering veins on the Tawa property to the north. The mineralized zones are deeply oxidized, and the property appears to have good potential as a bulk tonnage low-grade oxide gold deposit.
GSQOpenData@dnrme.qld.gov.au - Nandowrie 1:100000 Mine Map Provisional 1973
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URL: https://geoscience.data.qld.gov.au/dataset/mr003754 The NANDOWRIE Mine map was published in 1973, charted in 1974 at 1:100 000 as part of the 1:100 000 series to administer permit and permit related spatial information. The map was maintained internally as a provisional office chart and is located within the Nandowrie (8449) 1:100 000 map area. The map product is available to all government agencies, industry and the public for reference. Title and Image reference number is NANDOWRIE_7071. Cancelled 1982. Author:Department of Mapping and Surveying, Queensland.
Preliminary geological map of the Castle Mountain area, central Yukon (parts of NTS 106D/5, 6, 11, 12)
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not_specified
Mount Byng property, south Yukon
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An interesting grassroots exploration prospect is associated with a Lower Cretaceous intrusive complex on the ridge north of Mt. Byng, 50 km northeast of Whitehorse. Brecciated quartz-carbonate veins which return sporadic high gold values are associated with north-trending rhyolite dykes and small stocks.
Re-evaluating the chronostratigraphic framework for felsic volcanic and intrusive rocks of the Finlayson Lake region, Yukon-Tanana terrane, Yukon
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The Finlayson Lake district contains >30 Mt of volcanogenic massive sulphide (VMS) mineralization, but has not been the focus of field-based research since the mid-2000s. We present herein preliminary fieldwork on Yukon-Tanana terrane (YTT) host rocks that are the groundwork for future petrologic, isotopic, and geochronologic studies of the stratigraphy and crustal evolution of the VMS deposits and YTT rocks in the Finlayson Lake region and other peri-Laurentian terranes of the northern Cordillera. During the summer of 2017, we logged seven drill holes that intersected the stratigraphic hanging walls and footwalls of the mafic-hosted Fyre Lake and felsic-hosted Kudz Ze Kayah and GP4F VMS deposits. The stratigraphic results generally reveal finely laminated to bedded mafic or felsic volcaniclastic rocks that are interbedded with clastic rocks or cut by intrusive rocks and reflect changes in depositional environments and tectonomagmatic regimes in the Late Devonian to Early Mississippian.
New contributions to the bedrock geology of the Mount Freegold district, Dawson Range, Yukon (NTS 115I/2, 6 and 7)
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The Mount Freegold district is an ideal natural laboratory to evaluate the structural and magmatic framework for porphyry, skarn and epithermal mineralization in the Dawson Range. The district is located within a major extensional relay zone of the Big Creek fault system, a regionally significant dextral strike-slip structure in which localized extension facilitated the emplacement of mid to Late Cretaceous magmatic rocks. New mapping defines a previously unrecognized granite pluton at Mount Freegold, as well as the ca. 77 Ma Stoddart pluton, which represents the magmatic roots of hypabyssal intrusive rocks at the Revenue Cu-Mo-Au-Ag deposit and Nucleus Au-Ag-Cu deposit. The relay zone in the Big Creek fault system is partly plugged by the ca. 70 Ma Seymour Creek stock, which is cut by a southern strand of the fault system. Episodic fault movement took place over a minimum 35 m.y. interval during which at least three distinct epochs of magmatic-hydrothermal mineralization occurred.
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