Tukgahgo Mountain

Tukgahgo Mountain
Mount Tukgahgo in early fall.
Highest point
Elevation	4,675 ft (1,425 m)
Coordinates	59°18′01″N 135°37′46″W / 59.30028°N 135.62944°W / 59.30028; -135.62944
Geography
Location	Haines Borough, Alaska, U.S.
Parent range	Takshanuk Mountains
Topo map	USGS Skagway (B-2)
Climbing
First ascent	Unknown
Easiest route	Scramble

Tukgahgo Mountain (TUG-a-ho) is located in the Takshanuk Mountains with a peak elevation of 4,675 feet (1,425 m) in the U.S. state of Alaska. It is situated 6.6 miles (10.6 km) north of Haines, 3.5 miles (5.6 km) to the southwest of Chilkoot, and 16 miles (26 km) to the southwest of Skagway. It is one of eight peaks in Haines Borough. Geological investigations of the veins in the mountain have revealed silver, gold, platinum, and palladium mineralization, derived from mid-Cretaceous events.

Tukgahgo, an indigenous name given by the Tlingits, was recorded by geologist Eugene C. Robertson and published by the United States Geological Survey (USGS) in 1952. In order to climb the Tukgahgo Mountain and reach the summit, detailed information needs to be ascertained from the topographic maps published by USGS and the Skagway B-2 USGS quadrangle map. A part of the Coast Mountains, Tukgahgo is situated 3.5 miles (5.6 km) from Chilkoot, while Skagway is 16 miles (26 km) to the southwest. Vanderbilt Point is located 3 miles (4.8 km) west of Tukgahgo's summit. The head of Shakuseyi Creek is on the east slope of the mountain.

New geological findings close to Tukgahgo and the eastern ridge have been reported. In 1991, when the sampling was carried out by geologists, a rock formation 2,500 ft (760 m) to the southwest of Tukgahgo Mountain on the northwest trending Chilly peak (elevation 4,520 ft (1,380 m) was initially given the informal title "Chilly." The geologic formations of the area consist of metabasalts and amphibolites, which are enclosed as roof pendants within the hornblende diorite, granodiorite and monzonite. The intrusive rocks are inferred to be part of the Mount Kashagnak pluton. A few quartz veins were also identified, though they were scattered; they are integral to the Tukgahgo Mountain fault. This fault is small and close to the summit. The fault is within the Skagway B-2 Quadrangle and has a southeast (140 degree) strike or trend, with a movement of 1,480 feet (450 m); the movement is recorded as down on the northeast side compared to the southwest side. Along the fault metabasalts to the southwest are in fault contact with the diorite intrusive.