Indeed - there was some news stories about how the Navy should get a new Ice Breaker to protect the Antarctic based on one persons submission to the DWP
(they were not suggesting an ice-breaker, more of an ice-strengthened patrol vessel but most media were basing there articles on third hand reports)
Navy needs ice breaker - academic | Radio New Zealand News
Antarctica is the fifth-largest continent (above Europe and almost double the size of Australia), and can reasonably be assumed to hold huge mineral reserves.
Activities in Antarctica are regulated by a series of international treaties. The foundation stone is the 1959 Antarctic Treaty, which entered force in 1961. It sets aside Antarctica for peaceful activities and scientific research, and prohibits the use of military forces except to aid in scientific activities. This treaty was a highly successful diplomatic fudge that neatly skips over the seven countries that had already made territorial claims in Antarctica, including NZ.
NZ made an attempt to regulate commercial activities in Antacrtica with the Convention of the Regulation of Antarctic Mineral Resource Activities in 1988. While a handful of countries signed the Convention, non ratified it meaning it never came into effect.
It was effectively replaced by the Madrid Protocol (Protocol on Environmental Protection to the Antactic Treaty), which was thrashed out in the early 1990s and came into effect in 1998. It has been ratified by 33 nations, including most big players including the USA, UK, Russia, China, India and most of Europe.
Key components include
Article 3 - protection of the Antarctic environment as a wilderness with aesthetic and scientific value shall be a "fundamental consideration" of activities in the area.
Article 7 - "Any activity relating to mineral resources, other than scientific research, shall be prohibited."
Article 15 - member states to be prepared for emergency response actions in the area.
In the short term, I think the NZ government is concerned about whether NZ is able to effectively meet the emergency response requirements of Article 15. In the longer term, the Protocol is up for re-negotiation in 2046. Whle that sounds a long way off, it is only 31 years. Any RNZN vessel ordered today is very likely to be still in service then. Depending on the state of international relations, there could be an unregulated gold rush as various powers send exploration teams and military escorts south to grab whatever they can. I wouldn't rate this as probable, but active attempts to get at Antarcticas minerals are far more likely than not at some point.
Aplogies for the length of post, but it is an area that few kiwis trouble themselves about, even though it is happening 'next door'.