I am working in a mining company, this is totally mass field we have total 169 of permanent workers.They dont have much knowledge of leaves and etc, since last month i.e. july-2013 one of our company permanent worker(employee) absent the duties with out take permission from their dept head, on 07-08-2013 i have sent to notice by register post with acknowledgement to his permanent address to attend the duty from when he have received notice. on 21-08-2013 i got acknowledgement card from him , and yet i didnt get any reply letter or information from him, our management want to terminate him so please suggest me to what is the next step i have to take aganist him becoz we have registerd citu union also and also there is no chance give to him for raise industrial dispute aganist us.