A congressional commission in Chile has blamed mine owners for the rockfall which left 33 men trapped underground for 69 days last year.
The investigation found that Alejandro Bohn and Marcelo Kemeny were the prime culprits for the rock collapse last August.
It said the men were guilty of negligence, the BBC reports.
Both men deny the charges.
The commission also concluded that the Chilean state was at fault, saying that Sernageomin, the body responsible for overseeing the mining industry, should have done more to enforce safety rules.