A study of ores from twenty-seven districts, representing the main types of gold deposits in Canada and the United States, shows that they have a number of characteristic features, some of which are common to nearly all deposits. The process of cataclasis, one of minute fracturing and almost contemporaneous recrystallization of quartz in gold veins, is believed to have been a very important factor in permitting the residual solutions carrying the gold in the veins to permeate the quartz and distribute the gold. Vacuoles are very common in vein quartz and they also play a part. There are some evidences of the temperature at which gold was deposited and it is concluded that in all cases it was relatively low.

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