The men are believed to have drowned after water from a burst dam flooded the shafts and underground tunnels they were working in.
Police said rescue teams were trying to pump out the water and search for bodies and any survivors.
According to reports, illegal miners in Battlefields, 175 km west of Harare, had entered shafts on land owned by RioZim and another firm in search of gold.
It added that the two mines, called Silver Moon Mine and Cricket Mine, are run by registered companies.
UN condemns Israeli decision to establish military facilities in East Jerusalem
United Nations Secretary-General António Guterres has strongly condemned Israel's decision to establish military facilities in one of the UN's compounds in the Sheikh Jarrah neighbourhood of East Jerusalem.
Canada PM Carney says Israel's treatment of Gaza flotilla members is 'abominable'
Israel's treatment of detained Gaza flotilla activists is "abominable", Canadian Prime Minister Mark Carney said Wednesday, following the release of a video showing Israeli police forcing activists to kneel on the ground in rows with their hands tied behind their backs.
Tankers exit Hormuz as Trump, Vance talk up Iran deal prospects
Two Chinese tankers laden with oil exited the Strait of Hormuz on Wednesday, shipping data showed, brightening hopes that the US-Israeli conflict with Iran may soon be resolved after positive comments from president Donald Trump and his deputy.
SpaceX aims for 10,000 annual launches within five years, FAA says
SpaceX aims to reach 10,000 launches annually within five years, but government officials will need to see improved reliability before approving such an expansion, the head of the Federal Aviation Administration said on Wednesday.
Former Cuban President Raul Castro charged with murder in US
Former Cuban President Raul Castro has been indicted in the United States on murder charges, court records showed on Wednesday, in a major escalation in Washington's pressure campaign against the island's communist government.
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