Abstract The field trip departs from the Bon Air Motel in Kirkland Lake, cumulative mileage from the Bon Air Motel is signified by the round brackets ( ). Distances between field trip stops are also provided. Take Highway 66 west from the Bon Air Motel in Kirkland Lake to Highway 11 (15. 5 km). Continue west on Highway 66 to Matachewan. Cross the bridge over the West Montreal River, in Matachewan, where Highway 566 begins (61. 5 km). Continue west along Highway 566 for 3. 2 kilometres. Then turn right and park just beyond the gate to the Matachewan Consolidated Mine (64. 8 km).

Abstract The Matachewan camp is located in the southwestern Abitibi Greenstone Belt of the Superior Province, 55 kilometres west of Kirkland Lake, northeastern Ontario. Gold production from the camp has come entirely from two contiguous mines, the Young-Davidson mine (YDM) and the Matachewan Consolidated mine (MCM). Between 1933 and 1957, a total of 9. 6 million tonnes of ore with an average grade of 3. 1 g/t Au and 0. 93 g/t Ag was produced from these mines. In 1979-80 Pamour Porcupine Mines Limited removed an additional 18,000 tonnes of ore at >3.4 g/t from open pit operations on the Matachewan Consolidated property (Sinclair, 1982). Since the surface exposures of ore grade mineralization have long since been removed from the mines of the Matachewan area, one cannot examine the detailed controls of the mineralization. Thus the aim of this surface field trip is to examine the regional setting of the Matachewan gold mines, the geological history of the area, and the general style and mineralogy of the gold mineralization and associated alteration. These features may then be compared with those of other gold deposits associated with the major tectonic zones of the southern Abitibi belt. In addition, evidence of post-Archean reactivation of major structures, including the Larder Lake-Cadillac Break (LLCB), and its relevance to gold exploration will be examined.