Fissure-filling and vein deposits in the region of the Lexington dome have a paragenesis that is constant throughout the district. Regional zoning shows a concentric pattern, with fluorite and dark sphalerite in the central region grading to barite, galena, and light-colored sphalerite in the outer zone. The deposits are spatially related to faults and fractures cutting the Lexington dome, and are attributed to low-temperature solutions from a deep-seated magmatic source.

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