The McDougal Creek showing is located up near the headwaters of an east tributary to the creek, where pegmatite dikes, 1.2 to 3 metres wide, strike east across the creek and dip almost vertical. The lower dike contains a few scattered crystals of cassiterite and minor light-coloured pearly mica. The dikes crosscut Early and/or mid-Cretaceous coarse grained porphyritic granite.