The D-61-K native sulphur showing is located 225 kilometres north of Fort St. John and 105 kilometres southeast of Fort Nelson. It is located near the Fontas 1 First Nations Reserve, approximately 8 kilometres south of the Fontas River.

The D-61-K showing is situated on dominantly Cretaceous continental and marine affinity rocks of the Fort St. John Group (KF), which consists of mudstones, siltstones, shales and other fine clastic sedimentary rocks.

Native sulphur was intersected in well D-61-K 94I/3 while exploring for petroleum. A 3-metre section of free sulphur was intersected at 798.6 to 801.6 metres depth. The sulphur is hosted in Mississippian limestones, probably of the Rundle Group.