The S zone (Mount Polley) occurrence is located approximately 1.3 kilometres northeast of the northern end of Bootjack Lake.

The Mount Polley deposits occur within felsic Jurassic-Triassic Polley stock rocks, which have intruded Nicola Group volcanic rocks. The Nicola Group in the area comprises a sequence of alkali basalt breccias and Upper Triassic (Norian) flows overlain by polylithic breccias characterized by the presence of Lower Jurassic felsic clasts. The stock that hosts the copper mineralization is a complex of several intrusive phases ranging in composition from diorite to syenite. Polley stock of syenodiorite, monzonite porphyry and lesser pyroxenite composition forms the hills between Bootjack Lake and Polley Lake.

Locally, at the S zone, a narrow northwest- striking band of mineralization is indicated over a 200 metre strike length. The mineralized zone is hosted by a potassium feldspar rich monzonite porphyry with minor quartz veinlets.

In 1996, diamond drilling intersected the following : (Assessment Report 24759)

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drillhole        from       To      Width    Copper
number           (m)       (m)       (m)      (%)
S-224            3.66     40.23     36.57    0.376
S-225            2.44     72.54     70.10    0.285
S-227           46.94     74.37     27.43    0.317
S-228            6.10     18.29     12.19    0.215
S-228          118.87    140.21     21.34    0.236
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In 1996, Imperial Metals Corp. drilled six holes on the S Zone. See Mount Polley mine (MINFILE 093A 008) for a detailed work history of the area.