Working to connect piping in mine, EE used EE's shoulder to support the pipe while lowering the pipe hanger. Felt a pop in EE's right shoulder. Reported on 9/11/16, taken to be evaluated and given a full release on 9/13/16. 9/15/16, the employee requested an MRI and was given a second full release. 10/6/16 the employee was seen by the company doctor and placed on restricted duty.