It's interesting how much the mining industry has moved from Diesel fuel powered heavy equipment to full electric/battery and even hybrid (electric/diesel) equipment. There is a huge saving after the initial capital outlay for the new state of the art gear. No diesel fueling stations to maintain, fuel transportation costs and pipelines to maintain u/g, reduced fire risk, reduced ventilation needs, reduced heat signature, deadly exhaust gases etc etc. All the major players have battery powered heavy equipment along with quick battery change out options that result in faster turn around times than refueling requires. The equipment is cleaner, quieter, cooler, resulting it less stress on the operators. The hybrid stuff has been around for years with diesel power to move the drills then everything else on 600 volts. This change has allowed many mines to open or continue/expand especially the ones at depth where heat is a killer. Even underground 50 to 100 ton haul trucks run without diesel using a combination of battery and electric power similar to that used on streetcars through a pantograph.