The Alaska-Gastineau Mining Co. had its offices in 25 Broad St., New York City, New York. It was the operating company for the Alaska Gold Mines Co. in Alaska. 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. The property of the Alaska Juneau Gold Mining Co. adjoined the Alaska Gastineau on the west.

The Alaska-Gastineau Mine was a gold mine in Perseverance, about 4 miles (6.4 km) east of Juneau, Alaska, USA. It was briefly the largest gold mine in the world. The mine was operated by the Alaska-Gastineau Mining Company.