A major eruption of Mentolat occurred during the Holocene. This eruption generated a large ash deposit, the MEN1 ash, which extends southeast of the volcano. Grey pumice and scoria were deposited by this eruption, which was preceded by ash fall and ended with the deposition of lapilli. The MEN1 eruption was andesitic. The eruption may have occurred 7,690 ± 60 years ago, 5,010 ± 50 years BCE, 7,710 ± 120 years ago, another date is 7,518 years before present, as determined by radiocarbon dating. The MEN1 ash has been attributed to a more recent eruption, between 2,510 ± 30 and 3,890 ± 30 years ago.