Police along with WorkSafe have launched investigations after the crash last month in the Kakanui Range, east of Ranfurly, where two people died at the scene.
The pair killed have today been named as 50-year-old Gary David Murphy and 55-year-old Trevor Floyd Smith both of the United Kingdom.
The deaths have been referred to the Coroner.
Last week the tour operator the people were with when the crash happened was revealed to be high-end Queenstown adventure company, Prestige Adventure.
Its directors John Thomssen and John Kluts said in an emailed statement through a public relations firm the incident happened during ''a private, multi-day adventure expedition during a 4WD buggy stage.''
''We are extremely saddened by this tragedy and our thoughts and sympathies are with the families and friends of the people involved,'' the statement said.
It did not address a claim by Dome Hills station owner David Douglas the group did not have permission to be on his high country station in the Kakanui Mountains.
The company was ''doing what it can'' to support those involved and was co-operating fully with authorities, the statement said.
Police continue to say the crash involved a quad bike, but the firm said the vehicle involved was a 4WD buggy or side-by-side.
