Mr Mugabe accused foreign mining firms of “swindling” and “smuggling” in an interview on state-run TV in 2016.
“The companies have virtually robbed us of our wealth,” he said, adding that the treasury had seen little of about $15bn (£11bn) they had earned.
It is not clear if the 94-year-old will agree to appear before the committee.
He was forced to resign last December in the wake of a military takeover, and still has the privileges of a former head of state.
Meanwhile, the UK has said it would “strongly support” Zimbabwe’s return to the Commonwealth group of nations, following talks in London between UK Foreign Secretary Boris Johnson and his Zimbabwean counterpart Sibusiso Moyo.
Gen Moyo is the man who announced the military takeover in November, which led to Mr Mugabe’s resignation.
Although Mr Johnson said that Zimbabwe still had to ensure that this year’s elections were free and fair, his statement was condemned by opposition politician David Coltart, who said he was “appalled”.
During his last decade in office, several companies, including the army, police and a Chinese state company, were given vast tracts of concessions to mine diamonds at the rich Marange fields in the east of the country.
Themba Mliswa, who heads parliament’s mining committee, told Zimbabwe’s state-run Herald paper that the panel had interviewed former Marange mining executives as well as the police, army and intelligence services.
He said the committee had resolved to invite the former president “to explain the disappearance of the $15bn worth of diamonds”.
“We have set 9 May as the date on which he will give evidence.”
However, last month Mr Mugabe said he was not clear where the figure of $15bn had come from.
“I was given that by some officials, that figure had been circulating around, but really it was not confirmed,” he told the privately-owned Zimbabwe Independent.
If Mr Mugabe does appear before the committee, it would be his first public appearance since his resignation.
In 2006, more than 20,000 illegal diggers descended on the Marange fields.
Reports followed of a large-scale killings by Zimbabwe’s security forces to stop the smuggling, prompting Marange diamonds to be banned in 2009.
A Panorama investigation found in 2011 that in the Marange fields, the police and military recruited civilians to illegally dig for diamonds for them.
In 2012 a campaign group said at least $2bn worth of diamonds had been stolen from the Marange fields. Partnership Africa Canada (PAC) said the “theft” had enriched Zimbabwean officials, international gem dealers and criminals.
A Freelance Journalist, Entrepreneur and Philanthropist. Editor-in-Chief of www.233times.com. A contributory writer for Ghanaian Chronicle Newspaper. An alumnus of Adisadel College where he read General Arts. He holds first degree in Bachelor of Arts from the University of Ghana; Political Science (major) and History (minor). He has also pursued MSc Corporate Social Responsibility (CSR) and Energy with Public Relations (PR) at the Robert Gordon University in the United Kingdom. His mentors are Rupert Murdoch, Warren Buffet, Sam Jonah, Kwaku Sakyi Addo and Piers Morganview all posts by: Nana Kwesi Coomson
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