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Location: 17 km SW from Timmins, Ontario, Canada
8215 Hwy 101 WP.O. Box 1067TimminsOntario, CanadaP4N 7H9
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The setting of the TWM is characteristic of mesothermal Archean shear-hosted gold deposits. Dube and Gosselin (2007) have summarized the general consensus that greenstone-hosted quartz-carbonate vein deposits are related to metamorphism, partial melting, and thermal re-equilibration of subducted volcano-sedimentary terrains. Deep-seated, gold-transporting fluids were channeled to higher crustal levels through major crustal faults or deformation zones, similar to the Destor- Porcupine Fault Zone located about 5km south of the TWM. Enrichment of these mineralizing hydrothermal fluids was likely derived from the leaching of various components, most notably gold, from the volcano-sedimentary country rocks during fluid transport and ascension. The fluids then precipitated as vein material or wallrock replacement in second and third order structures at higher crustal levels through fluid-pressure cycling processes and other physicochemical reactions (temperature, pH, fS2, and fO2 changes).Gold mineralization in the TWM occurs in steep north-northwest plunging mineralized zones which are also parallel to the local L4 stretching lineation. Mineralization occurs within, or adjacent to zones of strong deformation such as the Holmer and Rusk Shear Zones. Mineralization at the Timmins Deposit is hosted in multiple generations of quartz-carbonate-tourmaline (± albite) veins, associated pyrite alteration envelopes, and disseminated pyrite mineralization. Textural evidence suggests that veining formed progressively through D3 and D4 deformation events. Mineralization at the Thunder Creek and 144 Gap Deposits postdates the Alkalic Intrusive Complex (AIC), with two main generations of quartz-pyrite (± scheelite, galena, and molybdenite) veins. Veining is almost exclusively hosted in syenite-monzonite intrusions adjacent to the Rusk Shear Zone and related structures (Rhys, 2010).The TWM includes the Timmins, Thunder Creek, and 144 Gap Deposits, all of which occur along the 144 Trend, a broad structural corridor that extends to the southwest from the Timmins Deposit area. This corridor generally coincides with the northeast trending contact zone between southeast facing mafic metavolcanic rocks of the Tisdale Assemblage (to the northwest) and dominantly southeasterly facing metasedimentary rocks of the Porcupine Assemblage (to the southeast). The contact dips steeply to the northwest and is modified, and locally deflected by folds and shear zones that are associated with gold mineralization.
