Siversk, formerly known as Yama until 1973, is a small city in Bakhmut Raion, Donetsk Oblast, Ukraine. Its economy has traditionally been b…Siversk, formerly known as Yama until 1973, is a small city in Bakhmut Raion, Donetsk Oblast, Ukraine. Its economy has traditionally been based around the mining and processing of dolomite. In January 2022, it had an estimated population of 10,875.