This is a copy of Iron Man #298 published by Marvel Comics in 1993.
"Heart of Stone" Part 1 of 3. Script by Len Kaminski. Pencils by Tom Tenney. Inks by Michael Avon Oeming. Cover by Kevin Hopgood and Steve Mitchell. At Stark Enterprises' Geothermal Research Facility, an earthquake threatens the lives of the employees operating an underground drilling rig! Heroically, one of the workers tries to shut down the geo-core drill, but instead falls into a deep chasm! And in that moment, Earthmover is born! 32 pages.