The Mac 3-4 (Bluff vein) occurrence is located on Wardle Creek, a tributary of Silverhope Creek, approximately 3 kilometres south-southwest from its junction with the Fraser River.

The area is underlain by a large body of quartz diorite of the Cretaceous Spuzzum pluton, near its contact with and intrusion of younger Oligocene quartz diorite and granodiorite.

Locally, a quartz vein (Bluff vein) hosts arsenopyrite mineralization. In 1986, diamond drilling (holes S86-2, 3 and 4) yielded up to 16.6 grams per tonne gold over 1.2 metres (Assessment 15872).

The area has been historically explored in conjunction with the nearby Aufeas (MINFILE 092HSW036) occurrence. In 1982, the area was prospected as part of the June Extension claim. In 1983, a program of prospecting, soil sampling and five diamond drill holes, totalling 120.09 metres, were completed on the area as the Hunter Group. During 1984 through 1986, Silver Cloud Mines completed programs of rock, silt and soil sampling, 55 metres of underground development and twelve diamond drill holes, totalling 913.7 metres, on the area as the Hunter and Mac claims. In 1996, the area was prospected as the S.C. 1 claim. In 2015, the area was prospected by D. Hunchuck.