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.
Afghan Taliban says 400 killed in Pakistan air strike on Kabul hospital
At least 400 people have been killed and 250 injured in an air strike by Pakistan on a drug users' rehabilitation hospital in Kabul, a spokesman of the Afghan Taliban government said on Tuesday, a sharp escalation in the conflict between the neighbours.
Five countries warn against major Israeli ground offensive in Lebanon
A "significant Israeli ground offensive" in Lebanon must be averted since it could have devastating humanitarian consequences, Canada, France, Germany, Italy, and Britain have said in a joint statement on Monday.
Fire breaks out at Qatar's Industrial Area after missile interception
Qatar's Ministry of Interior has announced that its civil defence forces are responding to a fire that broke out at its Industrial Area on Tuesday due to fallen shrapnel from a missile interception.
Kuwait arrests Hezbollah-linked cell in security crackdown
Kuwaiti security authorities have uncovered and arrested a cell linked to the banned organisation Hezbollah that was planning to destabilise the country and recruit new members.
Drone attack hits hotel in Baghdad Green Zone
Iraq's interior ministry said on Monday that a drone hit a hotel in Baghdad without causing casualties or material damages.
