The Soviet Pervorossiyskoye ship repair yard according to a CIA report dated September 1967

An item reported the fenced and road served Soviet Pervorossiyskoye ship repair yard with as geographic coordinates 49.39.15 north and 83.45.25 north located 5 nautical miles south west of Pervorossiyskoye [Kazakhstan?] on the north shore of the Czero Zaysan. The shipyard possessed a side-haul marine railway and 1 shop and 6 support buildings.

Source
The report was published on www.archive.org, document number CIA-RDP78T04759A007300010035-9