The discovery of major gold deposits in 1923 led to a gold rush in the Abitibi region, attracting settlers (exclusively men during the first six years) to the area in 1928. In 1935, the Canadian Malartic Gold Mines began operation, employing people from all over the province, Canada, and several east European countries. Together with Eastern Malartic and Malartic Goldfields that began operating in 1937 and 1939 respectively, these three became Quebec's largest gold mines. But newly arriving workers were not permitted to settle near the mines and would build a squatter camp on Crown land about 4 km (2½ miles) north of Malartic, that became the community of Roc d'Or. The two settlements grew concurrently, duplicating services. But the parishes (Saint-Martin-de-Tours in 1928), railway station, and post office (1936) were established near the mines in Malartic.