A special sitting of the Gauteng Provincial Legislature received a report by the Committee on the integrity commissioner (IC) findings on Friday.
Investigations were carried out by the IC into allegations that Mmemezi misused his official credit card.
In addition, allegations of irregularities related to an accident involving Mmemezi's official vehicle while he was driving in KwaZulu-Natal were also looked into.
On the issue of Mmemezi's credit card usage, the committee found that his use of the government issued credit card for personal use amounted to an act of negligence.
Further, the IC's report demonstrated Mmemezi's "lapse of judgment" in the usage of the credit card, the committee said.
Mmemezi had breached principles of integrity, honesty and leadership listed in the Code of Conduct and Ethics for members, the committee concluded.
"The committee has, however, taken cognisance of the subsequent resignation from the Executive and the public apology to the people of Gauteng by Hon. Mmemezi on 11 July 2012. Therefore, the Committee considers the loss of office to be an appropriate sanction," it added.
The committee recommended that the executive authority review the Ministerial Handbook, bearing in mind the effective and efficient use of state resources.
In addition, it recommended that the Premier issue clear and unambiguous guidelines on the acquisition and usage of state sponsored credit cards, taking into cognisance the spirit and intent of the Public Finance Management Act.
With regards to the accident, the committee noted that Mmemezi stated he had been the driver of his official vehicle, which had been involved in an accident with another vehicle in KZN in November last year.
It added that Mmemezi initially said that he had driven the car to the Eastern Cape and returned to Johannesburg in it.
However, a later admission by him revealed that the car was left in the care of a "sympathetic" local government councillor in the Eastern Cape, who sent it for repairs and drove it back to Gauteng about four weeks after the accident.
"The MEC has, at the very least, been very economic with the truth surrounding his involvement in an accident and the subsequent action which took place in KZN on his journey to the Eastern Cape.
"He has misled the Legislature and the Office of the IC and may have tried to cover up the extent of damage to his official vehicle. Needless to say, his behaviour is unbecoming of a member of the Provincial Legislature and in particular, a member of the Executive Council," the committee found.
