Even prior to thousands of years lost wax process was existing. It has been followed since 9th century for making Hindu God and Goddess sculptures. We have mastered the lost wax method being an age old technique that has been in existence since Chola Empire of the 12th century and still remains unchanged till date.
It is a known fact that Southern part of India is famous for making copper castings among other countries in the world. All the handicrafts including Cast In Bronze Creative do casting jobs based on the clear and supreme records/documents made long long ago.