Dear Geeta, your factory, as stated by you, "mechanical production company," comes under Minimum Wages Applicable for the Engineering Industry. The categorization of wages for the Engineering Industry is based on the skill of the employee, i.e., Highly Skilled, Skilled, Semi-Skilled, and Unskilled. Please follow the Highly Skilled/Skilled employee salary for the HR Executive.
For your ready reference, I am attaching herewith Minimum Wages for 2017-18 for your perusal. When raising a question, you are supposed to provide complete details of your factory. I presume that you are registered under The Factories Act, 1948, in Karnataka.