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.
Some UK departing flights disrupted by NATS technical issue
Some departing flights at major British airports were disrupted on Tuesday after air traffic control provider NATS experienced a technical issue, with Heathrow, Gatwick, Manchester and Stansted among the airports affected by restrictions and delays.
At least 73 injured after Houthi rebels attack Saudi civilian and energy facilities
At least 73 civilians have been injured after Yemen's Houthi rebels attacked a number of civilian and energy facilities in Saudi Arabia's southern region on Tuesday, state media confirmed.
UK, France and Canada sanction Israeli West Bank settlements
Britain, France and Canada on Tuesday moved to block imports from Israeli settlements in the occupied West Bank, as a wider group of countries signalled further steps to defend the two-state solution amid mounting concern over settlement expansion.
Suspect detained after sabotage attacks on Germany power grid
German police have detained a 48-year-old man suspected of carrying out a series of sabotage attacks on the country's electricity grid, police and prosecutors said on Tuesday.
Nepal rescue focused on workers trapped in three tunnels
Rescuers in Nepal are focusing on three hydropower project tunnels where they believe dozens of workers could be trapped, authorities said on Tuesday, two weeks after a devastating flood killed hundreds and left thousands missing.
