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.
Kuwait air defences deal with Iranian missile, drone attacks
The Kuwaiti Armed Forces have announced its air defence systems are actively intercepting Iranian missile and drone attacks early on Thursday.
Two Palestinian teens killed in West Bank raid by Israeli settlers, army
Two Palestinian teenagers have been killed on Wednesday in an attack by Israeli settler fighters and army troops on their village in the occupied West Bank, local officials and the Palestinian health ministry said.
Latest Indonesian free meal poisoning outbreaks affect 800, lawmaker says
Nearly 800 Indonesians have fallen ill in separate incidents of food poisoning linked to the government's free meals programme, a member of a parliamentary commission overseeing health said, including more than 500 students in East Java province this week.
Chinese students marooned in floods unleashed by Typhoon Saudel's rains
China has warned of flash floods in the southeastern province of Fujian while heavy rain trapped teachers and students in a compound in eastern Zhejiang as storms from Typhoon Saudel lashed several regions, state media said on Thursday.
US and Iran exchange attacks as lull in war appears over
The US and Iran found themselves back on a war footing on Wednesday after the most significant exchange of fire in weeks, with Washington threatening more devastating strikes.
2:00pm - 6:00pm
Brent Black has the biggest stories of the day and the stuff you might have missed.
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