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Gold recovered from placers has alloyed with it other metals in varying proportions. The proportion of pure gold in these alloys is known as the fineness ot the gold and is expressed as parts in a thousand. Thus an alloy containing 850 parts of gold is referred to as 850 fine. Alaska placer gold ranges from more than 970 fine to slightly less than 565 fine. This report analyzes the records obtained from 1,534 determinations of the fineness of Alaska placer gold and shows that 23 percent of the records are of gold of fineness'higher than 900; 42 percent are between 850 and 8991 ; 26 percent between 800 and 849; and 9 percent of gold less than 800 fine. In addition to this broad classification, the records are analyzed according to a number of other classifications. Thus, the quality of gold from each of the 8 major geographic regions, the 41 districts, and the 84 smaller areas are tabulated and discussed in some detail separately. The various modes of occurrence are compared and correlated so far as practicable with respect to geologic environment and relation to features that may have significance in affecting the fineness of the placer gold. The report affords no conclusive evidence as to the causes of the variations in fineness noted, but serves rather to bring together some of the fundamental data which, with more detailed studies of other factors, will be helpful in solving some of the abstruse problems relating to the characteristics and formation of Alaska placers.

Fineness of gold from Alaska placers