The Tummel fault zone, a northwest-trending belt of rocks of uncertain age and/or tectonic affinity, separates Paleozoic miogeoclinal strata of Cassiar Terrane from Yukon-Tanana Terrane metavolcanic and metasedimentary rocks. Northeast of the fault, Cassiar Terrane comprises pelitic and semipelitic rocks with rare amphibolite, which are correlated with the Kechika Group. These are overlain by carbonate correlated with the Askin Group. Southwest of the fault, in Yukon-Tanana Terrane, Devono-Mississippian siliciclastic rocks are overlain by Mississippian arc volcanic rocks. Granodiorite and diorite of the Telegraph Plutonic Suite (348-350 Ma) intrude the siliciclastic rocks. Foliated greenstone, leucogabbro intrusions, serpentinite and chert occur in the Tummel fault zone. The Early Cretaceous Glenlyon Batholith intrudes strata of Cassiar Terrane. Contact metamorphism recognized across the Tummel fault zone is interpreted to have been imposed by the Glenlyon Batholith. If correct, this interpretation requires that post-mid-Cretaceous displacement across the Tummel fault zone has been minimal (~5 km).

The deposit models project is an attempt to classify the many known metallic mineral deposits and occurrences in Yukon into specific mineral deposit models. This work began with the initiation of regional mineral potential assessments by the Yukon government (e.g., Bradshaw and vanRanden, 2004). The quantitative method used for regional mineral assessments in Yukon is based on a method developed by the United States Geological Survey (USGS), which uses the mineral deposit models of Cox and Singer (1986). The reader is encouraged to consult this reference for further discussion on the fundamental purpose for defining mineral deposit models. In general terms, resource assessments require that tracts of land be assessed on the basis of probability for the occurrence of one or more specific deposits of a particular type with previously defined grades and tonnages. In the course of conducting regional mineral potential assessments, grade and tonnage information for deposit types that occur or potentially could occur in Yukon was compiled, grade and tonnage curves were constructed, and deposit models were assigned to known mineral deposits and occurrences (i.e., Yukon MINFILE occurrences).

Contains PDF maps of regional mineral potential by deposit models for Yukon. Also included is a PDF document containing methodology, limitations, and a description of the data used for the assessments. There are three directories: Report folder - open file report in WORD format and PDF format. Index folder- PDF map showing tract numbers; and PDF table of deposit models assessed in each tract. Maps folder - 18 PDF maps of regional mineral potential by individual deposit model.

Yukon-Tanana Terrane in the Livingstone Creek area comprises five successions of metasedimentary and metavolcanic rocks which range in age from pre-Upper Devonian to Lower Mississippian. They are correlated with Lower Mississippian and older strata in the Glenlyon and Finlayson Lake areas. Yukon-Tanana rocks are intruded by at least five plutonic suites, ranging in age from Late Devonian to Late Cretaceous. The structural style of the area is dominated by a transposition foliation which is axial planar to isoclinal folds of an earlier foliation. The transposition foliation is itself folded by northeast-verging open folds. The d'Abbadie fault zone, a 1-km-wide zone of imbricate fault slices in the eastern part of the area, is characterized by multiple generations of ductile fabrics overprinted by younger cataclastic breccia zones. Deformation along d¿Abbadie fault is in part constrained by syn-tectonic emplacement of a ca. 96 Ma granite pluton along the western margin of the fault zone. Two new showings are reported here: a Pb-Ag vein occurrence and a pyrrhotite skarn. In addition, anomalous Cu-Zn values in graphitic phyllite associated with chloritic schist suggest potential for volcanogenic massive sulphide- (VMS) or hybrid VMS-sedimentary-exhalative-style mineralization in the area.

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Paleozoic platformal and basinal strata of Cassiar Terrane are separated from rocks of Yukon-Tanana Terrane to the west by an unexposed fault in southeast Glenlyon map area. Quartzite, marble, phyllite, and amphibolite are grouped in Cassiar Terrane, and no rocks of Slide Mountain Terrane are recognized. The mid-Cretaceous Glenlyon batholith contains pendants of Cassiar Terrane and is intruded by at least five andesite dykes. West of the fault, the Yukon-Tanana Terrane includes: (1) mafic volcaniclastic rocks with preserved primary textures; (2) coarse-grained quartz-feldspar grit; and (3) metasiltstone and semi-pelitic schist. The grit is intruded by foliated hornblende granodiorite, likely of early Mississippian age. Small outcrops of tectonized serpentinite were tectonically emplaced into Yukon-Tanana Terrane, and a positive magnetic anomaly parallel to the fault suggests an unexposed extension to the southwest. Two mylonite localities and evidence of brittle cataclasis up to 1 km on either side of the presumed buried fault suggest a complex structural history along this terrane boundary.

The following tables have been compiled from information derived from the Yukon MINFILE 2005 A database of mineral occurrences (Deklerk and Traynor, 2005). Reserve and resource figures presented are not calculated by Yukon MINFILE personnel, but are quoted from referenced industry sources, publications, assessment and/or technical reports, etc. The reader is encouraged to refer to the original data for detailed information.

Base metal-silver prospects have been known to exist in the upper Swift River region since 1946. These prospects, occurring in Yukon-Tanana terrane, have been previously described as isolated skarn occurrences and have hitherto received limited prospecting attention. Exploration work at the Mod property in 2016 has indicated that the sulphide mineralization is deformed (hence it predates the adjacent Cretaceous Seagull batholith) and that it demonstrates textures that are not consistent with a skarn origin. If, indeed, this mineralization is of exhalative origin then a large region of Yukon-Tanana terrane becomes prospective for mineralization similar to that of the Finlayson VMS district.

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The following tables have been compiled from information derived from the Yukon MINFILE 2008 — An database of mineral occurrences (Deklerk, 2008), and from various technical reports and information that have been filed in the SEDAR system by, or on behalf of, public companies. Reserve and resource figures presented are not calculated by Yukon government personnel, but are quoted from referenced industry sources, publications, assessment and/or technical reports, etc. (see next page). The reader is encouraged to refer to the original data for detailed information.