- 1910

Douglas population exceeded Juneau 1,722 to 1,644 in the 1910 census and Treadwell contributed another 1,222. The first regular movie theaters opened in Juneau and Douglas, although movies had been introduced several years earlier as side attractions at various venues.

C.P.R. Co’s S.S. Princess May wrecked on Sentinal Island, Alaska, 8-5-1910. Alaska State Library, John Grainger Postcard Collection, ca. 1897-1940, W.H. Case, P255-79-70.

The Canadian Pacific Railway steamer Princess May struck Sentinel Island reef August 5 and remained on it for a month before it was removed and repaired. All aboard were uninjured at the time of the accident and were safely evacuated onto rescue vessels and brought to Juneau.

On March 3 at 11:25 p.m., an underground powder magazine at the Mexican Mine blew up killing 37 miners waiting nearby for a shift change, the worst single accident in Alaska mining history. The exact cause was never determined, although two stope bosses were in the powder room when it happened. Treadwell began treating ore concentrates in a cyanide process, reducing costs and increasing recovery of values. The company also constructed a hydroelectric plant at Sheep Creek with transmission lines crossing the channel at Kowee Creek on Douglas Island, thence to the mines to power its machinery.