Gravity and Magnetic Survey of an Abandoned Lead and Zinc Mine in Linn County, Kansas

Abstract

Gravity measurements support the hypothesis that an abandoned lead and zinc mine near Pleasanton, Kansas, is associated with a slump pipe. A negative gravity anomaly closure of ≈ 0.4 mgal is consistent with a brecciated zone extending at least 600 feet through basal Pennsylvanian strata and into those of the Mississippian. A second negative gravity anomaly of the same magnitude occurs several hundred feet north of the first and may correspond to a similar slump structure. This second anomaly remains unexplored to date. Magnetic field measurements show no apparent correlation with slumps in this area.