General Information
Primary Commodities: rare earths
Secondary Commodities: zirconium, niobium
Aliases: Guano
Deposit Type(s): Skarn
Location(s): 61.502870 N, -132.441430 W
NTS Mapsheet(s): 105F08
Location Comments: Based on showing location in AR 095343
Hand Samples Available at YGS: No
Capsule
Regional Geology
The occurrence is located on the Cassiar Platform, a curvilinear shelf that formed in the early Paleozoic, roughly parallel to the western margin of the North American craton but separated from it by the Selwyn Basin. Shallow marine miogeoclinal sediments were emplaced on the platform until Late Devonian time. Block faulting and local uplift during the Late Devonian and Mississippian resulted in deposition of carbonaceous shale and chert pebble conglomerate in the Selwyn Basin and across the platform. Local explosive volcanism produced volcaniclastic material and flows of the Pelly Mountains volcanic belt. The belt comprises localized submarine volcanic centres generated in an extensional environment that are separated by basins in-filled with sediments and volcaniclastic rocks. Several cogenetic syenite and trachyte domes and small stocks are the remains of vent areas. Subsequent deformation is a result of Mesozoic thrust faulting related to the Cordilleran orogeny, emplacement of Cretaceous intrusions and Tertiary strike-slip movement along the major northwest-trending Tintina Fault, 30 km to the northeast.
Property Geology
The occurrence was first identified as Garnet Skarn in Archer, 1977 (AR 090269). The showing consists of very coarse crystals within the syenitic True Blue Pluton. The mineralization has been identified as greisen, an endoskarn. XRD mineral identification confirmed that the main minerals are subhedral, pale, clear, orange grossularite in a medium to fine grained matrix of mica, augite and kaolin. The adjacent syenite has also been altered, with a conspicuous red-altered phase primarily formed of plagioclase. The occurrence of grossularite and plagioclase indicates that the fluids were calcium-rich. A grab sample of the calcium-feldspar altered rock returned 1.24% TREO, 0.07% ZrO2 and 0.07% Nb2O5 (AR 095343).
Fluorite has been identified within the host syenite in the area.
The occurrence is located on the Cassiar Platform, a curvilinear shelf that formed in the early Paleozoic, roughly parallel to the western margin of the North American craton but separated from it by the Selwyn Basin. Shallow marine miogeoclinal sediments were emplaced on the platform until Late Devonian time. Block faulting and local uplift during the Late Devonian and Mississippian resulted in deposition of carbonaceous shale and chert pebble conglomerate in the Selwyn Basin and across the platform. Local explosive volcanism produced volcaniclastic material and flows of the Pelly Mountains volcanic belt. The belt comprises localized submarine volcanic centres generated in an extensional environment that are separated by basins in-filled with sediments and volcaniclastic rocks. Several cogenetic syenite and trachyte domes and small stocks are the remains of vent areas. Subsequent deformation is a result of Mesozoic thrust faulting related to the Cordilleran orogeny, emplacement of Cretaceous intrusions and Tertiary strike-slip movement along the major northwest-trending Tintina Fault, 30 km to the northeast.
Property Geology
The occurrence was first identified as Garnet Skarn in Archer, 1977 (AR 090269). The showing consists of very coarse crystals within the syenitic True Blue Pluton. The mineralization has been identified as greisen, an endoskarn. XRD mineral identification confirmed that the main minerals are subhedral, pale, clear, orange grossularite in a medium to fine grained matrix of mica, augite and kaolin. The adjacent syenite has also been altered, with a conspicuous red-altered phase primarily formed of plagioclase. The occurrence of grossularite and plagioclase indicates that the fluids were calcium-rich. A grab sample of the calcium-feldspar altered rock returned 1.24% TREO, 0.07% ZrO2 and 0.07% Nb2O5 (AR 095343).
Fluorite has been identified within the host syenite in the area.
Location Map
Last Updated: Mar 27, 2020
Work History
| Year | Work Type | Comment |
|---|---|---|
| 2010 | Airborne Geophysics: Gamma-Ray Spectrometry | |
| 2010 | Airborne Geophysics: Magnetic | Great Western Minerals options the claims from True North Gems |
| 2010 | Geochemistry: Soil | Contour soil sampling line downhill from the occurrence |
| 2009 | Geochemistry: Rock | McEvoy Geosciences performed exploration work on behalf of True North Gems |
| 2002 | Other | Restaked as Shark 1-94 claims in 2002 and 2003 by Archer Cathro on behalf of True North Gems |
| 1987 | Other | Restaked as White 1-123 cl in Aug/87 by Mountain Province Mining Inc. |
| 1977 | Airborne Geophysics: Radiometric | Contour line airborne radiometrics |
| 1977 | Geochemistry: Soil | |
| 1977 | Ground Geophysics: Scintillometer | |
| 1976 | Geochemistry: Rock | |
| 1976 | Geology: Bedrock Mapping | |
| 1976 | Other | Staked as Guano claims by Ukon Joint Venture (Chevron and Kerr Addison) |
Regional Geology - Terrane
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Related References
| Number | Title | Page(s) | Document Type |
|---|---|---|---|
| YEG1979_80-pg55 | Rare earth elements in the Guano-Guayes skarn property Pelly Mountains, Yukon Territory | Annual Report Paper | |
| MIR1976 | Mineral Industry Report 1976 | Annual Report | |
| 1979Chronic | Geology of the Guano-Guayes rare earth element bearing skarn property, Pelly Mountains, Yukon Territory | MSc Thesis |
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