Police spokesman Whitney Bacchus said the men were mining in the pit about 9 to 12 metres deep "when it caved in and covered them."
The incident occurred at Arau, Eteringbang, near Guyana's western border with Venezuela late Thursday afternoon. However, information about it only emerged Saturday because there is no telephone contact with the remote, forested and mountainous Amazon region.
The victims have been identified as Taigo Nunes Pinto, Ronaldo Da Silva Sousa, Joao Nelson Pinto Mands and Joao Gonsalves Martins.