Advocate Glynnis Breytenbach was last Thursday served with a letter of intention to suspend, with "abuse of power" cited as the reasons for the decision.
Breytenbach's lawyer, Gerhard Wagenaar, has subsequently written to the NPA to request more information in order to respond to the institution.
NPA spokesman Bulelwa Makeke said it was an internal matter and should be treated confidentially.
"Any expectation from the media and the public for the organisation to respond fully on inquiries is, therefore, unfair.
"The NPA will desist to engage any further in the media on this and/or any other matter of a similar nature until it is finalised," Makeke said.
In their letter to Breytenbach, a senior prosecutor at the Specialised Commercial Crimes Court, the NPA allege that she abused her powers in the criminal investigation of the multibillion-rand Sishen iron ore mining deal.
A portion of the prospecting rights to the mine was initially awarded to Imperial Crown Trading, whose beneficiaries include President Jacob Zuma's son, Duduzane, Deputy President Kgalema Motlanthe's partner, Gugu Mtshali, and Jagdish Parekh, who heads the Gupta family's business empire.
After a challenge by Kumba Iron Ore, the Pretoria High Court invalidated the award to Imperial last year.
However, many believe Breytenbach is being punished for, among others, her reluctance to drop fraud charges against suspended crime intelligence boss Richard Mdluli.
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