Name: M-102 Primary Sources of Construction Aggregate in the Twin Cities Seven-County Metropolitan Area - Sand and Gravel Sources

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Description: The original data of sand and gravel aggregate sources was sourced from the Minnesota Geological Survey (MGS) for the M-102 project, Primary Sources of Construction Aggregate in the Twin Cities Seven-County Metropolitan Area. The dataset presented here was reformatted by the MN DNR in order to distribute it on an online map server of Aggregate Resources data. The original data file is called 'agsg99_polygon'. The datafile included codes rather than descriptions. The DNR reformatted the data by adding in descriptions for each code for easier reading and comprehension. Please consult the orignial MGS data, maps, and metadata at: http://conservancy.umn.edu/handle/11299/57004 According to the MGS, information that was used to map sand and gravel deposits used various criteria. Several operators and consultants in the aggregate industry, staff of the Materials Division of the Minnesota Department of Transportation and the Division of Minerals of the Minnesota Department of Natural Resources helped to establish the criteria. Deposits are classified by percentage of material retained on the number 4 sieve (4.76-millimeter pore space), sand and gravel thickness, thickness of overlying deposits, location of the water table, and relative amounts of subsurface information available Data was divided into primary sources, potential secondary sources, and gravel pits. It was subdivied by sieve data, thickness of sand and gravel deposit, thickness of overlying sediments, position of water table, and finaly data reliability. This is listed in table 2 of the M-102 map plates.

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