Wagner; Boston King; Salmon Creek Gold Mining Co. Mine, Juneau Mining District, Juneau, Alaska, USAi

Regional Level Types
Wagner; Boston King; Salmon Creek Gold Mining Co. Mine	Mine
Juneau Mining District	Mining District
Juneau	City Borough
Alaska	State
USA	Country

Location: This mine is adjacent to lower Salmon Creek at an elevation of about 50 feet. It is 2 miles west-southwest of Salmon Creek reservoir and 1/4 mile northeast of Gastineau Channel, in about the center of the N1/2 section 9, T. 41 S., R. 67 E. of the Copper River Meridian. The location is accurate.
Geology: The Wagner Mine consists of over 1,600 feet of underground workings including 3 adits and a shaft at least 250 feet deep (Eakin, 1915). The mine processed gold ore with a 20-ton tubular mill and a 15-stamp mill but there is no documentation of the amount of gold produced (Redman and others, 1989). The deposit was discovered in 1889. It consists of multiple quartz veins along the contact between black phyllite and an altered diorite dike. The veins are up to 4 feet thick and contain arsenopyrite, pyrite, chalcopyrite, pyrite, galena, sphalerite and tetrahedrite. No data on metal grades are available (Eakin, 1915). This mine is in the Juneau Gold Belt, which consists of more than 200 gold-quartz-vein deposits that have produced nearly 7 million ounces of gold. These gold-bearing mesothermal quartz vein systems form a zone 160 km long by 5 to 8 km wide along the western margin of the Coast Mountains. The vein systems are in or near shear zones adjacent to west-verging, mid-Cretaceous thrust faults. The veins are hosted by diverse, variably metamorphosed, sedimentary, volcanic, and intrusive rocks. From the Coast Mountains batholith westward, the host rocks include mixed metasedimentary and metavolcanic sequences of Carboniferous and older, Permian and Triassic, and Jurassic-Cretaceous age. The sequences are juxtaposed along mid-Cretaceous thrust faults (Miller and others, 1994). The sequences are intruded by mid-Cretaceous to middle Eocene plutons, mainly diorite, tonalite, granodiorite, quartz monzonite, and granite. Sheetlike tonalite plutons emplaced just east of the Juneau Gold Belt and undeformed granite and granodiorite bodies that are emplaced farther to the east are between 55 and 48 Ma (Gehrels and others, 1991). The structural grain of the belt is defined by northwest-striking, moderately to steeply northeast-dipping, penetrative foliation that developed between Cretaceous and Eocene time (Miller and others, 1994). The majority of the veins in the Juneau Gold Belt strike northwest. Isotopic dates indicate that the auriferous veins in the Juneau Gold Belt formed between 56 and 55 Ma (Miller and others, 1994; Goldfarb and others, 1997).
Workings: The Wagner Mine consists of over 1,600 feet of underground workings including 3 adits and a shaft at least 250 feet deep (Eakin, 1915). The deposit was discovered in 1889.
Age: Isotopic dates indicate that the auriferous veins in the Juneau Gold Belt formed between 56 and 55 Ma (Miller and others, 1994; Goldfarb and others, 1997).
Production: The mine processed gold ore in a 20-ton tubular mill and a 15-stamp mill, but there is no documentation of the amount of gold produced (Redman and others, 1989).

Commodities (Major) - Ag, Au, Cu, Pb, Zn
Development Status: Undetermined.
Deposit Model: Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)

Other Databases

Link to USGS - Alaska:	JU132

Other Regions, Features and Areas containing this locality

References