Alaska-Gastineau Mining Company

It worked the Alaska-Gastineau Mine/Perseverance Mine in the Silver Bow Basin, approximately 4 miles (6.4 km) from Juneau and processed its ore at an old remodeled mill and crushing plant at Sheep Creek.

[4] After 1910, Bartlett L. Thane, the mining engineer who pioneered hydroelectric power in Juneau, Alaska,[5] became managing director.

The coarse-crushing plant was situated on the mountainside at the terminus of the railroad at an altitude of 125 feet (38 m) above sea level.

The lowest floor of the concentrating mills was 192 feet (59 m) above sea level, affording ample grade for the disposal of the tailing, which was carried into the Gastineau Channel.

There were two stations, one at sea level near the mouth of the stream, and the other at the upper end of the first basin at an altitude of 350 feet (110 m) immediately below the falls.

A concrete dam held in storage 19,000 acre-feet (23,000,000 m3) of water as reserve to keep the Pelton wheels moving during the winter months.

Private businesses were conducted nearby by consent of the company, including a steam laundry.