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Island Mountain Island Mountain Trinity County, California Elevation 3,847 ft (1,173 m) [1] Location Coordinates 39°57′48″N 123°29′31″W / 39.9632061°N 123.4919661°W / 39.9632061; -123.4919661Coordinates: 39°57′48″N 123°29′31″W / 39.9632061°N 123.4919661°W / 39.9632061; -123.4919661[2] Topo map USGS Bell Springs and Updegraff Ridge Island Mountain is a resistant formation of volcanic and metavolcanic rock in the Franciscan Assemblage of southwestern Trinity County. The Eel River makes an abrupt "S" curve around the mountain in its otherwise north-northwesterly flow between the California Coast Ranges.[3] History Island Mountain was the final obstacle to completion of the Northwestern Pacific Railroad between San Francisco and Eureka, California. Railroad construction proceeded northerly down the west side of the Eel River canyon and bridged the river at the "S" curve to enter 4,313-foot (0.82 mi; 1.31 km) tunnel number 27 through the mountain.[4] There was a golden spike ceremony downstream of the mountain at Cain Rock in 1914 to complete the railroad.[5] The redwood framing of tunnel 27 burned on 6 September 1978, and a significant length of the tunnel collapsed. Tunnel rebuilding costing 3.8 million dollars was completed on 7 December 1979.[6] Mining A volcanogenic massive sulfide ore deposit within the mountain was mined after rail service became available. Mining recovered 4100 tons of copper, 140,000 ounces of silver, and 8,600 of gold between 1915 and 1930.[7] Minerals identified within the ore body include chalcanthite, chalcopyrite, copiapite, goslarite, pyrite, and pyrrhotite.[8] Volcanic rock was quarried from Island Mountain by Northwestern Pacific Railroad for heavy riprap used as far away as Humboldt Bay.[4] References ^ "Updegraff Ridge" (map). U.S. Geological Survey.  ^ "Island Mountain". Geographic Names Information System, U.S. Geological Survey.  ^ Strand, Rudolph G (1962). "Geologic Map of California:Redding Sheet". State of California Resources Agency.  ^ a b Gale, V.J.; Valles, R.C. (Roadmasters) (1978). (untitled maintenance-of-way charts). Southern Pacific Railroad.  ^ Stindt, Fred A; Dunscomb, Guy L. (1964). The Northwestern Pacific Railroad, Redwood Empire route. p. 50.  ^ Stindt, Fred A. (1985). The Northwestern Pacific Railroad, 1964-1985, Vol. 2. pp. 15–19. ISBN 0-9615465-0-6.  ^ Davis, Fenelon F. (1966). "Economic Mineral Deposits in the Coast Ranges". Geology of Northern California (California Division of Mines and Geology) (190): 320.  ^ "Island Mountain Mine, Island Mountain, Trinity Co., California, USA".