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.
One person dies after Virginia university shooting
One person has died following a Thursday morning shooting at Old Dominion University in Norfolk, Virginia, while two others remained in stable condition, the university's police chief said at a press conference.
Shooting sparks police response at Michigan synagogue
The Michigan State Police reported a shooting incident on Thursday at the Temple Israel Synagogue in the Detroit suburb of West Bloomfield, Michigan, and law enforcement authorities rushed to the scene.
Iran's supreme leader, in first remarks, vows to keep strait closed
In his first remarks read on state television since taking over, Iran's new supreme leader Mojtaba Khamenei has vowed to keep the Strait of Hormuz closed.
Four Bahrainis arrested for spying for Iranian Guard
Bahrain's Ministry of Interior has announced on Thursday that four citizens were arrested for carrying out espionage activities with the Iranian Revolutionary Guard Corps (IRGC).
Two US sailors injured after non-combat fire aboard carrier in Red Sea
Two U.S. sailors were injured after the USS Gerald Ford suffered a non-combat-related fire on board, the U.S. military said on Thursday.
