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The Iron Mask batholith is an Early Jurassic composite alkaline intrusion located southwest of Kamloops in south-central British Columbia (Figure 2-6-1). It lies in the southern portion of the Quesnel trough in the Intermontane tectonic belt. It is a northwest-trending body approximately 22 kilometres long and 5 kilometres wide intruding volcanic and sedimentary rocks of the eastern belt of the Upper Triassic Nicola Group (Preto, 1979). Emplacement is inter-preted to have been controlled by major northwesterly and northeasterly trending fault systems and previous workers have suggested that the batholith is subvolcanic and coeval with the Nicola Group (Northcote, 1977b).

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