Is Shuangyashan Mining Group and Longya Coal Mining Group Shuangyashan Branch a unit?

It is a unit. Shuangyashan Mining Group was formerly known as Shuangyashan Mining Bureau. In the process of state-owned enterprise reform, Heilongjiang Long Mei Group merged the state-owned mining enterprises of Shuangyashan, Jixi, Hegang and Qitaihe to form Long Mei Group. Therefore, Shuangyashan Mining Group is a subsidiary of Long Mei Group.