What to do when the silt in a borewell has reached to 210 ft level ?

Hi, I have dug a borewell 430 ft deep at Ulsoor in Bangalore. Four months ago the motor got stuck in the borewell and I pulled the motor up using air pressure. The motor was then repaired and while re-installing the motor it got stuck again. I called the borewell camera person who confirmed that the motor was stuck inside. Then using a chain pulley I myself lifted the motor but the silt has come to 210 ft level now and the static level of water is still 35 ft. Please suggest what has to be done in this situation. Can I still use the water using a silt pipe with one end closed.