At least four deaths were confirmed within the Hillo mining area in Moyale subcounty, Marsabit county, in the past four days.
This is the latest such incident to happen amid operations to address the menace.
Local authorities say the miners are defying bans, despite the dangers posed by the sites.
Moyale deputy county commissioner Benedict Munyoki said unauthorised miners have flocked the area and are trying to access prohibited gold mines.
Munyoki added that some managed to sneak in the operation area and started excavating for the precious mineral, leading to four deaths after the mines caved in.
The administrator said three people died on the wee hours of Thursday night, while the fourth death occurred later on.
One miner also sustained critical injuries and is fighting for his life at the Moyale Subcounty Hospital, where he is hospitalised.
The government outlawed the unlicensed gold mining activities in 13 sites within Hillo in Dabel ward in March this year through a Gazette notice by Interior and National Administration Cabinet Secretary Kithure Kindiki, citing state security, economic and safety concerns.
Suspected foreigners from Nigeria, the Democratic Republic of Congo and Somalia have reportedly unlawfully migrated to the area, where they are involvedin unregulated gold and chromite mining valued at million of shillings.
The proceeds are suspected to be sources of funding for criminal activities.
Through the Gazette notice, the government declared the area as a disturbed and placed it under security surveillance around the clock.