Fantastic Plate Electrum Gold Nugget Crystal Specimen from the Round Mountain Mine in Nevada. This is called "Plate" gold because the gold has formed in thin plates approximately 1/16" thick. Electrum is what they call gold that is at least 20% silver, as this rare nugget is. Electrum is rarely seen and almost never offered for sale. It is very rare to find this type of gold. This is the only piece of electrum that I have in my collection. This crystallized gold nugget has a lot of surface area for the weight and the price. This gold specimen is 1" long x 5/8" wide and weighs 1.4 Grams.