Goodhue County Bedrock Geology relevance to silica sand mining Tony - - PowerPoint PPT Presentation

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goodhue county bedrock geology relevance to silica sand

Goodhue County Bedrock Geology relevance to silica sand mining Tony - - PowerPoint PPT Presentation

Feb 18, 2024 591 likes •731 views

Goodhue County Bedrock Geology relevance to silica sand mining Tony Runkel Minnesota Geological Survey University of Minnesota The Goodhue County Geologic Atlas describes and shows the distribution of bedrock, loose sediment on top of

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Goodhue County Bedrock Geology –relevance to silica sand mining

Tony Runkel Minnesota Geological Survey University of Minnesota

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BEDROCK

SAND, GRAVEL, CLAY

The Goodhue County Geologic Atlas describes and shows the distribution of bedrock, loose sediment

n top of bedrock, and water within the rock and

sediment

Tony Runkel Minnesota Geological Survey University of Minnesota

BEDROCK VERSUS QUATERNARY SEDIMENT (unconsolidated sand/gravel/clay)

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GOODHUE COUNTY BEDROCK MAP A A’ A A’

Tony Runkel Minnesota Geological Survey University of Minnesota

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Tony Runkel Minnesota Geological Survey University of Minnesota

Quartz-rich sand grains from bedrock (“silica sand”) Typical “glacial” sand on top of bedrock

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Kenyon area Red Wing area White Rock area A A’ A A’

Quartz-rich bedrock layers generally near land surface Jordan Sandstone St Peter Sandstone

Tony Runkel Minnesota Geological Survey University of Minnesota

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Kenyon area Red Wing area Example: Jordan Sandstone White Rock area ~500ft

Tony Runkel Minnesota Geological Survey University of Minnesota

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Kenyon area Red Wing area Example: St Peter Sandstone White Rock area ~500ft

Tony Runkel Minnesota Geological Survey University of Minnesota

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Tony Runkel Minnesota Geological Survey University of Minnesota

Jordan Sandstone St Peter Sandstone Quartz-rich bedrock layers generally near land surface

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Tony Runkel Minnesota Geological Survey University of Minnesota

Thickness of unconsolidated (glacial” sediment in feet) = bedrock “cover”

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Tony Runkel Minnesota Geological Survey University of Minnesota

Jordan Sandstone St Peter Sandstone Quartz-rich bedrock layers Covered by less than 50 ft unconsolidated sediment

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Tony Runkel Minnesota Geological Survey University of Minnesota

Jordan at/near surface St Peter at/near surface

Draft (unreviewed) Map by Minnesota Geological Survey

Tony Runkel Minnesota Geological Survey University of Minnesota

Quartz-rich sandstone bedrock layers at or near (approx 50 ft) land surface

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Tony Runkel Minnesota Geological Survey University of Minnesota

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Tony Runkel Minnesota Geological Survey University of Minnesota