Correlating Particle Size, Geochemical, and Gamma-Ray Log Data Relationships at the Ochs Brick and Tile Company Springfield Clay Mine, Springfield, Minnesota
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Correlating Particle Size, Geochemical, and Gamma-Ray Log Data Relationships at the Ochs Brick and Tile Company Springfield Clay Mine, Springfield, Minnesota
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1998
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University of Minnesota Duluth
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Technical Report
Abstract
Borehole geophysical techniques can be very useful for characterizing the physical and
chemical characteristics of sedimentary deposits. A comparison of down-hole gamma-ray response
to particle size and geochemistry shows that the down-hole gamma-ray logging technique effectively
distinguished between intervals of varying composition at the Ochs Brick and Tile Company (OBT)
Springfield clay mine in Brown County, Minnesota. Particle size (grain size) has a first order effect
on the gamma activity; it is likely that mineralogy also is a significant contributor to variations of
radioactivity. The naturally occurring radionuclides K, U, and Th in selected drill core samples
show that K dominates the total gamma measurements obtained from borehole logging equipment.
Consistency of the U and Th activities indicate no significant post-depositional migration of isotopes
with the decay series for each nuclide and reflect the average crustal abundance for each.
While the collection and laboratory testing of drill hole samples should be attempted
whenever possible (especially during property exploration and development), the down-hole
gamma-ray probe can provide additional valuable stratigraphic information. Therefore, gamma-ray
logs would be especially beneficial where: 1) extensive drill hole sampling is impractical; or 2) the
drilling method makes determining stratigraphic position and unit composition difficult or
impossible, e.g., auger drilling. However, if gamma-ray logging is to be used extensively during
exploration or property development, down-hole sampling should still be done to establish basic
relationships between the "typical" gamma-ray profile and the type of material present at the
property in question.
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Zanko, Lawrence M; Setterholm, Dale R. (1998). Correlating Particle Size, Geochemical, and Gamma-Ray Log Data Relationships at the Ochs Brick and Tile Company Springfield Clay Mine, Springfield, Minnesota. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/187119.
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