Abstract
The Lake George antimony mine was at one time North America’s largest producer of antimony. Despite being widely known for the antimony mineralization, the deposit also hosts a range of styles of mineralization such as multiple generations of W-Mo bearing quartz veins as well as a system of As-Au bearing quartz–carbonate veins. In situ U-Pb zircon geochronology, using LA ICP-MS, of the Lake George granodiorite yielded a weighted mean 206Pb/238U age of 419.6 ± 3.0 Ma. Step heating of phlogopite separated from the lamprophyre dykes produced a 40Ar/39Ar plateau segment date of 419.4 ± 1.4 Ma. Single molybdenite crystal analysis for Re-Os geochronology was conducted on two W-Mo-bearing quartz veins, which cross-cut altered granodiorite and altered metasedimentary rocks and yielded two dates of 415.7 ± 1.7 Ma and 416.1 ± 1.7 Ma respectively. 40Ar/39Ar geochronology of muscovite from alteration associated with Au-bearing quartz–carbonate veins yielded one representative plateau segment date of 414.1 ± 1.3 Ma. The dates produced in this study revealed that the different magmatic–hydrothermal events at the Lake George mine occurred over approximately a 10-million-year period at the end of the Silurian and the start of the Devonian following the termination of the Acadian orogeny.
Highlights
IntroductionThe Lake George antimony mine, located approximately 30 km west of Fredericton in west-central
The Lake George antimony mine, located approximately 30 km west of Fredericton in west-centralNew Brunswick (Figure 1), was once North America’s largest producer of antimony
All U-Pb geochronology was conducted at the University of New Brunswick isotope geochemistry lab using in situ LA ICP-MS
Summary
The Lake George antimony mine, located approximately 30 km west of Fredericton in west-central. New Brunswick (Figure 1), was once North America’s largest producer of antimony. The area surrounding the Lake George mine contains W, Mo, and Au mineralization; these commodities were never the focus of exploration or development. Antimony was first discovered in the Lake George area during road construction in 1863; since the area has seen sporadic exploration and mining activity [1]. The Lake George Mining and Smelting company was formed in 1876 to operate the Hibbard mine. In 1869, the first shaft was sunk on the property followed by the construction of a mill and smelter by the Hibbard Antimony Company in. Between 1863 and 1969, three shafts were sunk on the Hibbard, Adams, and Lawrence showings
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