The Da occurrence is located on the Pachena Cone, approximately 6.5 kilometres west-northwest of the community of Bamfield

The area is underlain by a quartz diorite plug within diorite, both of the Early to Middle Jurassic Island Plutonic Suite. Upper Triassic intermediate volcanics of the Karmutsen Formation (Vancouver Group) outcrop to the northeast and east.

The quartz diorite is strongly pyritized. Minor amounts of molybdenite and chalcopyrite occur in quartz-filled fractures in the quartz diorite and diorite.

In 1968, the DA group was staked, and in 1971, a grid geochemical soil survey and geological mapping was completed. In 1980, Teck Mining Group completed a program of geochemical sampling and prospecting.