Genetic implications of mineralization and alteration ages at the Florida Canyon epithermal Au-Ag deposit, Nevada

Florida Canyon is a large, disseminated epithermal Au-Ag deposit localized along and in
the footwall of the ~N-S range-bounding fault zone on the western margin of the Humboldt
Range in north-central Nevada. Mineralization was primarily controlled by range-front faults,
a NE-trending shear zone and subsidiary structures. Vein and alteration mineralogy at Florida
Canyon suggest an affinity with low-sulfidation epithermal deposits. However, it is hosted by
weakly metamorphosed siliciclastic sedimentary rocks of Triassic age and apparently lacks igneous
rocks that are coeval with mineralization. Valley-fill sediments adjacent to the deposit
host the shallow portion of the Humboldt House geothermal system, which has a reservoir temperature
of 219–252°C and is associated with auriferous quartz veins, sinter and travertine.