EE was helping pick up the stacker. (ST-02). When hooking the chain up, EE felt a pull in the right shoulder. This EE had not received any work restriction that affected the job at the mine site, but did have restrictions. EE was released as of 9/5/2017. Disputed EE's claim & now moved forward with shoulder surgery. Completed on 4/19/18. No lost time or modified duty till surgery.