In the second season of The Transformers, electrum is an element that allows the Autobots and Decepticons to become virtually invulnerable to enemy firepower.
Silver lode, deposit of precious metal found as alloy with gold (electrum) and in ores containing sulfur, arsenic, antimony or chlorine; 1859 Comstock Lode in U.S. state of Nevada was largest for its time, but has been eclipsed by 1990 discovery of Cannington Lode in Australian state of Queensland