Gold in Placer Deposits: Gold Placers. Gold Deposits in the Virginia City-Alder Gulch District, Montana

摘要

The report contains 2 parts. The first part discusses gold in the United States. Specific topics include the following: Production; Descriptions of major placer-gold regions and districts--California modern and fossil placers; Alaska modern placers; Helena-Last Chance district, Montana; Virginia City-Alder Gulch district, Montana; Boise Basin district, Idaho. Part two discusses gold deposits in the Virginia City-Alder Gulch district, Montana. Specific topics include: Geology; Age of the deposits; Placer gold; Lode gold; and Genesis of the gold ores.