An interesting overview of gold as a metal and as a medium of exchange, written in an era where the gold standard was still used. This book covers all aspects of gold mining and refining, along with its economic aspects and implications.
The Geology of Gold (origin of gold, primary deposits, percentage of gold in continental masses and seas)
The Geographical Distribution of Gold (mostly covering North America, with some Australia)
The Extraction and Dressing of Gold (crushing of ores, amalgamation, etc)
The Economy of Gold (statistics, industrial uses, gold currency and bi-metallism, purchasing power, evolution of the gold industry, political events, etc)