Here are some full text books about Gold and Gold mining.

Stephen's diary includes his narrative concerned with the gold rush, the major part of his journal.

Gold and debt: an American hand-book of finance, with over eighty tables and diagrams illustrative of the following subjects: the dollar and other units; paper money in the United States and Europe; gold and silver in the United States and Europe; suspensions of specie payments; the era of gold; values of the precious metals; the era of debt; the rise and fall of prices; also, a digest of the monetary laws of the United States./ By W. L. Fawcett.
Fawcett, William Lyman
Chicago: S. C. Griggs and company1877.