Chief investigator of accidents, Captain Tim Burfoot, said warm temperatures over the summer had led to greater than usual snow and ice melt - making it easier for a team to recover debris.
"As a result, several items of wreckage that had previously been hidden or considered too unsafe to recover had become more accessible,'' captain Burfoot said.
"We always aim to recover as much wreckage as possible and practicable without endangering those involved and I am happy to say the recovery yesterday was successful."
The debris recovered yesterday will be sent to the Commission's technical facility, in Wellington, for further analysis.
An investigation into the circumstances of the crash is expected to be completely by May, 2017, a statement said.