You can view a full copy of the Council's latest Draft Local Plan, including it's latest plans for the greenbelt in Ponteland and Hexham here: http://committees.northumberland.gov.uk/aksnorthumberland/images/att19724.pdf
The plan will go before the County Council's ruling Policy Board on 27th November and if approved will then go out to public consultation on 12th December 2014 until 11 February 2015.
I have reproduced the two Greenbelt maps for Hexham and Ponteland below.