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In November 1903, about 100 miners at the Ravensdale coal mines form a union, a branch of the United Mine Workers of America.

In 1903, miners were working 10 hours per day, six days a week (60 hours per week). By 1910 miners were earning $3 per day for an eight hour day, six days a week (48 hours a week). By 1910 union membership increased to 238, which was 90 percent of the trade.

Sources: [Washington] Bureau of Labor, Seventh Biennial Report of the Bureau of Labor Statistics and Factory Inspection 1909-1910 (Olympia: E.L. Boardman, Public Printer, 1910), 51.

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