This minor lead showing is situated in the Sync 2 claim, at the head of a tributary of Through Creek, 6.5 kilometres southwest of the confluence of Through Creek and Gataga River (Assessment Report 7604, Figure 5).
The occurrence lies 12 kilometres northeast of the Northern Rocky Mountain Trench, which coincides with the Kechika River valley. The region is underlain by folded and thrust-faulted Cambrian to Mississippian sedimentary rocks belonging to Ancestral North America (Geological Survey of Canada Map 42-1962, 1712A, 1713A).
The North Sync property is underlain by bands of limestone and shale which alternate across strike. Bedding strikes about 315 degrees, and dips very steeply southwest. By extrapolation with Ministry mapping 12 kilometres to the northwest (Fieldwork 1994, page 280; Open File 1995-4), the limestone and shale probably belong to a Middle to Upper Cambrian carbonate unit, or to the overlying Upper Cambrian to Lower Ordovician Kechika Group, which consists of interbedded calcareous shale and limestone (Geological Survey of Canada Paper 1988-1E). It is also possible that both units are present and are structurally repeated by tight folding or thrusting, but there is not enough information to tell.
Several outcrops containing galena and rare malachite were found along strike for about 800 metres. Massive galena forms fracture fillings or replacement bodies in the limestone within a few metres of the shale contact (Assessment Report 7604).
Superficially, this setting is similar to that at the Rough prospect (094L 011), 21 kilometres to the southeast.