For 10 points, name this metal that bimetallism supports using as legal tender in addition to gold.
A town that produced this resource was hoaxed by an article in the Territorial Enterprise claiming that donations to the "Great Austin Flower Sack" would benefit a "Miscegenation Society." Large finds of this resource were referred to as "bonanzas." Mark Twain spent his formative years in one of this resource's boom towns, Virginia City. One seventh of the working male population was required to extract this resource for the Spanish government under the mita system. Major sources of this resource included Potosi in modern-day Bolivia and Nevada's Comstock Lode. For 10 points, name this metal that bimetallism supports using as legal tender in addition to gold.
A town that produced this resource was hoaxed by an article in the Territorial Enterprise claiming that donations to the "Great Austin Flower Sack" would benefit a "Miscegenation Society.
silver [or Ag]