AGGREGATE RESOURCE POTENTIAL

GRAVEL PITS, AGGREGATE SOURCES, FIELD OBSERVATION SITES

ISANTI COUNTY, MINNESOTA

Field	Description
Main ID Information	Metadata Updated 2007
Title	Aggregate Resources and Quaternary Geology - Gravel Pits and Field Observation Sites, Isanti County, Minnesota. This layer is part of Report 304, from 1992.
Filename	shapefiles: gp92apt3 and gp92bpt3 and Access 97 database, isanapot.mdb
Abstract	This dataset consists of the locations of gravel pits, aggregate sources, and field observation sites from a variety of sources. This work is authorized by Minnesota Statute 84.94.
Place Keywords	Isanti County, MN
Theme Keywords	Aggregate potential, gravel pits, observation sites, aggregate sources
Time Period of Content	1990-1991
Parent Theme
Spatial Extent of the Data	Isanti County, Minnesota
Contact Person	Aggregate Resources Mapping Program
Contact Person Organization/Division	Minnesota Department of Natural Resources, Division of Lands and Minerals
Contact Person Position	Geologist or GIS Specialist
Contact Address	500 Lafayette Road, Box 45
Contact City	St. Paul, MN
Contact Zip Code	55155-4045
Contact Voice Phone	651-259-5959
Contact Fax Phone	651.296.5939
Additional ID Information
Originator	Department of Natural Resources, Division of Lands and Minerals, Mineral Potential Section.
Purpose	To identify the locations of existing gravel pits, aggregate sources, and field observation sites used in the creation of the 1992 Aggregate Resources and Quaternary Geology, Isanti County, Minnesota map.
Progress	Complete
Currentness Reference	Air photo interpretation 1990-1991, field work summers of 1990 and 1991, USGS quadrangles, and MN/DOT aggregate sources.
Maintenance Frequency	None planned
Access Constraints	NA
Use Constraints	NA
Associated Data Sets	shapefiles: sg92xpy3 - surficial geology and aggregate potential, sg92xln3 - surficial geology mapping unit line symbols, sym92ln3 - surficial geology line symbols Access 97 database: isanapot.mdb
Data Quality
Attribute Accuracy	Gravel pits were digitized from 1:24,000 USGS quadrangles, located by field work, or obtained from the Minnesota Department of Transportation..
Logical Consistency	NA
Completeness
Horizontal Positional Accuracy
Vertical Positional Accuracy	NA
Lineage	These two shapefiles and the Access database are part of Minnesota Department of Natural Resources, Minerals Division, Report 304, Aggregate Resources and Quaternary Geology, 1992, by JD Lehr. Gravel pits locations were gathered from a number of sources, including the Soil Survey of Isanti County (from Soil Conservation Service), 1:24000 USGS topographic maps, Isanti County Highway Department, field observations by the author, JD Lehr, and Minnesota Department of Transportation gravel pit sheets.
Source Scale Denominator	1:62,500
Spatial Reference
Horizontal Coordinate Scheme	UTM
Ellipsoid	GRS80
Horizontal Datum	NAD83
Horizontal Units	Meters
Distance Resolution	NA
Altitude Datum	NA
Altitude Units	NA
Depth Datum	NA
Depth Units	NA
UTM Zone Number	15, extended
Raster only
Cell Width	NA
Cell Height	NA
Spatial Data Organization
Geographic Reference for Tabular Data	NA
Native Dataset Environment	ArcView 3.1 / Arc/INFO 7.2.1
Vendor Specific Object Type	NA
Tiling Scheme	County
Spatial Object Type	Point
Transfer Size
Entities -- Attributes
Entity-Attribute Overview	Gravel pits, MN/DOT aggregate sources, and field observation sites, with a field in the table to indicate if they were or were not shown on the map.
Entity-Attribute Detailed Citation	The complete table is listed below:

Table Name	Field Name	Begin Column	Definition	Valid Values	Descriptions
gp92apt3 shapefile					Gravel pit and observation site locations
	pitno		Number,3,0		Gravel pit and/or field observation site, given as a number
				e.g., 12, 26, 27, 69 (i.e., those values less than 90)	Gravel pit and field observation site - locations gathered from several sources. In places single symbols indicate multiple gravel pits. May be active, inactive, depleted, or reclaimed.
				90	Gravel pits identified from a number of sources. These gravel pits were not visited by the author and are therefore not field observation sites.
				e.g., 101, 116,138, 175 (i.e., those values greater than 90)	Field observation site at a road cut, natural exposure, excavation. These sites were not plotted on the final map.
	pittype		Text, 40		Gravel pit and/or observation site, given as text
				Gravel pit with field observation	Gravel pit locations derived from a number of sources, including the Soil Survey of Isanti County, Isanti County Highway Department files, and 1:24000 USGS topographic maps. These sites were visited by the author. These sites correspond to pitno < 90.
				Gravel pit	Gravel pit locations from a number of different sources, including the Soil Survey of Isanti County, Isanti County Highway Department files, and 1:24000 USGS topographic maps. For these sites, pitno = 90.
				Field observation site	Sites visited by the author. May include road cut, natural exposure, excavation. For these sites, pitno > 100.
	obsite		Number,2,0	Numbers ranging from 1 to 75.	Field observation site number. Use this field to relate to the information stored in isanapot.mdb.
	drawmap		Text,1		Indication of if the gravel pit location was drawn on the map
				Y	The gravel pit was drawn on the map
				N	The gravel pit was not drawn on the map because there were several in the same location, so one symbol, not several, was used to represent them. If the site was a field observation site only, the site was not plotted on the map.
gp92bpt3 shapefile					MN/DOT aggregate source locations, based on MN/DOT pit sheets. These sites generally include gravel pits.
	dotid		Number,5,0	e.g., 30001, 30008, 30010, 30025, 30034	MN/DOT assigned aggregate source ID. First two digits (i.e., 30) represent the county, the last three digits the source ID.
	dotid2		Text,1	e.g., A or B	Where the pits have been further subdivided into parts and mapped on separate pit sheets, MN/DOT differentiated these pits by letter.
	dotpit		Text,6	e.g., 30001A, 30001B, 30017, 30031, 30035	MN/DOT assigned aggregate source ID combining the numeric and text parts of the ID.
	draw		Text,1		Indication of if the aggregate source location was drawn on the map
				Y	The aggregate source location was drawn on the map
				N	The aggregate source location was not drawn on the map because there were several aggregate sources in the same location, so one symbol, not several, was used to represent them.
	obsite		Number,2,0	Numbers ranging from 8 to 36.	Field observation site number. Use this field to relate to the information stored in isanapot.mdb.
isanapot.mdb - individual tables are listed below.					Access database containing additional information about the field observation sites, relationships among the mapping units and the major and minor lithologies, texture data at several observation sites, MN/DOT aggregate source data listed on pitsheets and as part of ASIS (Aggregate Source Information System).
notebook					Locations and additional information about the field observation sites.
	obsite		Number,6,0		Field observation site number. Use this field to relate to the information stored in isanapot.mdb.
	county		Text,10	Isanti, Anoka, Chisago, Kanabec, Mille Lacs	Name of county where field observation site is located.
	township		Number,6,0	34,35,36,37,38	Township number from the Public Land Survey, often listed as T.35N.
	range		Number,6,0	21,22,23,24,25,26	Range number from the Public Land Survey, often listed as R.25W.
	section		Number,6,0	1 to 36	Section number from the Public Land Survey.
	quarter		Text,7	e.g., AB, DCC, ABBBC	The portion of the section where the site is located. Letter combinations are used, where A is the northeast, B is the northwest, C is the southwest, D is the southeast. The first letter represents the 160-acre part of the section, the second letter the 40-acre part, the third letter the 10-acre part, the fourth letter the 2.5-acre part, the fifth letter the .625-acre part, and the sixth letter the .15625-acre part. For example, AB represents the NW-1/4 of the NE-1/4.
	quad_name		Text,12	e.g., Bradford, Dalbo, Isanti, Springvale, Typo Lake	Name of the 1:24000 USGS topographic map
	samples		Text,1	y or n	y - a sample was taken at this location, n - a sample was not taken at this location
	photos		Text,1	y or n	y - a photo was shot at this location, n - a photo was not shot at this location
	date_desc1		Date,8	e.g., 9/21/1990, 10/26/1990, 11/21/1990	Date that the site was visited and described
	date_desc2		Date,8	11/21/1991 or 11/22/1991	The second date the site was visited and described.
notes					Observation site descriptions from the field notebook.
	obsite		Number,6,0	1 to 73	Field observation site number. Use this field to relate to the information stored in isanapot.mdb.
	fieldnote		Memo		Notes written, describing the site, what was found there, sample number if a sample was taken.
notesexp					Observation site descriptions from the field notebook. This table is the same information as the notes table, but the fieldnote field has been subdivided into 7 fields so that the data could be more easily transferred among various software packages, including Arcview.
	obsite		Number,6,0		Field observation site number. Use this field to relate to the information stored in isanapot.mdb.
	notes1		Text,200		The first 200 characters of fieldnote.
	notes2		Text,200		The second 200 characters
	notes3		Text,200		The third 200 characters
	notes4		Text,200		The fourth 200 characters
	notes5		Text,200		The fifth 200 characters
	notes6		Text,200		The sixth 200 characters
	notes7		Text,200		The seventh 200 characters
majormat					Major lithology, minor lithology, mantle lithology for each mapping unit
	geo_unit		Number,6,0	10,15, 20,21, 23,25,24, 27,28, 32,33, 34,35,36, 37,39, 89,99	Quaternary (i.e., surficial) geology units, given as a number
	geo_label		Text,4	O,Al, Dlc,Dlf, Doc,Docm,Di, Dt,Dtl, Som,Soml, Si,Sim,Siml, St,Stml, W,W	Quaternary (i.e., surficial) geology units, given as a character string (presented in the same order as above, for geo_unit)
	major_lith		Text,30	peat, silt, fine sand, sand, sand and gravel, till	The major lithology (i.e., composition) of the mapping unit.
	minor_lith		Text,30	clay, organic-rich silt, silt, silty sand, till	The minor lithology of the mapping unit.
	mantl_lith		Text,35	none (i.e., no mantle); undiff. Grantsburg sublobe deposits; in places, fine sand; in places, silt; silt	The lithology of the mantle in the mapping unit.
textures					Sample number, texture data, Munsell colors, field description, and observation site numbers.
	samplenum		Number, long integer	e.g., 309001, 309003	Number of the sample taken at the observation site
	pct_gravel		Number, single,2 decimal places	e.g., 1.5, 7.1, .98	Percentage of gravel in the sample
	pct_sand		Number, single, 2 decimal places	e.g., 49.1, 50.9, 1.7, 81.9	Percentage of sand in the sample
	pct_silt		Number, single, 2 decimal places	e.g., 27.9, 60.8, 35.1, 89.4	Percentage of silt in the sample
	pct_clay		Number, single, 2 decimal places	e.g., 28, 16.1, 6.6, 53.9	Percentage of clay in the sample
	text_class		Text,15	loam, clay loam, silt loam, sandy loam, silty clay, silt, loamy sand	Texture of the sample
	munsell		Text,10	e.g., 10YR 6/6, 5YR 4/6	Color of the sample based on the Munsell guide
	wet_dry		Text,1	w - wet, d - dry, ? - unknown	The wetness of the sample
	field_desc		Text,25	Grantsburg sublobe till, Lake Grantsburg clay, Lake Grantsburg silt, Superior lobe till, Superior lobe ice-contact	The source of the material in the sample, base on field observation
	obsite		Number,6,0	e.g., 6, 10, 23, 50, 60, 64	Field observation site number. Use this field to relate to the information stored in isanapot.mdb.
pitsheet					Summary table created from the information on the MN/DOT pit sheets in conjunction with the mapping units found in sg92xpy3 shapefile. This information was summarized by the author about 1990.
	geo_label		Text,4	Di, Docm, Dlc, Dt, Si, Sim, Som	Quaternary (i.e., surficial) geology mapping units, given as a character string, from the sg92xpy3 shapefile.
	dotid		Number, integer	e.g., 30001, 30017, 30028, 30036	MN/DOT assigned aggregate source ID. First two digits (i.e., 30) represent the county, the last three digits the source ID.
	dotpit		Text,6	e.g., 30001A, 30001B, 30017, 30028, 30036	MN/DOT assigned aggregate source ID combining the numeric and text parts of the ID.
	location		Text,17	e.g., 35-23-01AB, 36-23-36DC	The location given in Public Land Survey coordinates in the following format: township-range-section-quarter. Refer to the documentation for the notebook table, above, under the field labelled "quarter" to see a description of what the letter combination means.
	utme27		Number, long integer	e.g., 488250, 464330	UTM east coordinate, in meters, given in NAD27.
	utmn27		Number, long integer	e.g., 5044625, 5060738	UTM north coordinate, in meters, given in NAD27.
	utme83		Number, long integer	e.g., 488233, 464313	UTM east coordinate, in meters, given in NAD83.
	utmn83		Number, long integer	e.g., 5044839, 5060952	UTM north coordinate, in meters, given in NAD83.
	pct_gravel		Number, integer	e.g., 9, 27, 0, 40, 63	Percent gravel.
	pct_crsand		Number, integer	e.g., 33, 46, 22, 5, 36	Percent coarse sand.
	pct_fines		Number, integer	e.g., 58, 20, 95, 33, 19	Percent fines.
	av_lar		Number, double, 2 decimal places	e.g., null (i.e., no value), 21.8, 19, 17.8, 18.1	Average Los Angeles Rattler test.
	avp_shalp4		Number, double, 2 decimal places	e.g., null (i.e., no value), 0.9, 2.2, 1, 0.4	Average percentage of shale at plus 4 mesh.
	avp_shalm4		Number, double, 2 decimal places	e.g., null (i.e., no value), 2.5, 0.7, 1.2, 0.4	Average percentage of shale at minus 4 mesh.
	avp_chert		Number, double, 2 decimal places	e.g., null (i.e., no value), 0.3, 0.2, 0	Average percentage of chert.
	avp_ironox		Number, double, 2 decimal places	e.g., null (i.e., no value), 0.3, 2.2, 0.8, 0.2, 0	Average percentage of iron oxide.
	numvalue		Number, integer	e.g., 16, 8, 5, 41, 26	Number of values for a pit on the pit sheet
isanasis					MN/DOT Aggregate Source Information System (i.e., ASIS) data obtained in 1990. It is possible to get newer ASIS data by going to the MN/DOT web site at www.dot.state.mn.us and searching for "ASIS" (as of 4/2001).
	dotid		Number, integer	e.g., 30001, 30017, 30028, 30036	MN/DOT assigned aggregate source ID. First two digits (i.e., 30) represent the county, the last three digits the source ID.
	status		Text,1	A=active, I=inactive, C=commercial gravel source, N=no data available.	ASIS source status, as of last record update (in this case, 1990).
	twp		Number, integer	34, 35, 36, 37	Public land survey township number. Usually given as T.34N.
	rng		Number, integer	23, 24, 25	Public land survey range number. Usually given as R.23W.
	sec		Number, integer	1 to 36	Public land survey section number.
	quarter		Text,20	e.g., W1/2,NE1/4; NE1/4,NE1/4; SW1/4,SE1/4; S1/2,NE1/4,NE1/4	Public land survey, portion of the section.
	own_oper		Text,25	e.g., Isanti Co., State(DNR), Riteway S&G, Olson P	Name of the owner/operator.
	near_city		Text,19	e.g., Dalbo, Cambridge, Stanchfield	Name of the nearest city.
	class		Text,6	4; 5; 4,#200; 6,BA-1	MN/DOT material class for aggregate
	est_quant		Number, long integer	e.g., 10000, 34000, 40000, 57200	Estimated quantity of aggregate
	comments		Text,50	e.g., 9% limestone, Non-commercial, Almost Cl.5...	Additional comments about the aggregate source.