Mr Renny
What have you been doing for the last 10 yrs if the documents were lost(Since you have specified the period it seems it is in your knowledge about the loss).
1. Lodge a police complaint fortwith.
2. Based on the FIR, publish the loss in newspapers in vernacular and english about the loss and any one claiming the property.
3. If there are no claims, then apply for a certified copy from the office of the local registrar where the document was registered.
4. Produce all the docs before the bank, but in all probability the loan will not be sanctioned since the banker may be cautious while dealing with your file.