A NatureScot spokesperson said the decision on marking it as a Site of Special Scientific Interest (SSSI remains “a priority under consideration”.
They added: “NatureScot staff have, as far as possible, surveyed the site for suitable habitat and are currently completing work on a proposed boundary based on our experience of the land and expert judgement.
“We will be discussing this work further with the owners and occupiers of the land and North Ayrshire Council.
“This is an extremely complex site where we hope it will be possible to balance several different interests, including businesses, developers, local community groups, eNGOs and recreational users.
“As such, it’s important that we take the time to engage with all parties as this work continues to find the best ways to protect and manage biodiversity interests in this area.”
A spokesperson for Chemring said: “Chemring operates a long-established, highly regulated site at Ardeer and is working closely with NatureScot throughout its ongoing reviews.
“The activities referenced in recent claims do not relate to our land, and we remain committed to developing our site responsibly while supporting the environmental assessment process.”
NPL Group were approached for comment.