Answering Jan Kares here:
So You need not only time for bolting, but legal authorization to bolt too.
Now, without legal authorization to bolt, You have to pay ALL the bolts and anchors for the new routes.
If you send this letter to Dorgali Municipality, if they accept, You have to pay NOTHING for bolts.
For every NEW route inside/around Colombi cave, You would receive, from Dorgali Municipality:
- legal authorization to bolt NEW routes
- ALL the bolts (the first 2, the 2 at the anchor, the anchor itself, in titanium).
The other option is ask them authorization just to bolt new routes, without any rebolting (their number 1 priority), but the risk they say "no" would be higher.
So ... pay less, bolt more ! :-)