AGGREGATE POTENTIAL – POLYGONS

DODGE COUNTY, MINNESOTA

 

Field

Description

Main ID Information

Metadata Updated 2007

Title

Dodge County Aggregate Resource Evaluation

Filename

Cs02xpy3 (ArcView Shapefile)

Abstract

This dataset consists of information about the geology, geological characteristics, and aggregate potential of bedrock units.  Twelve fields relate to crushed stone characteristics, including probability, quality, overburden thickness, and deposit size, of the map unit.  These characteristics were used to calculate the aggregate potential of the map unit for crushed.

Place Keywords

Dodge County, Minnesota

Theme Keywords

Surficial Geology, Geological Characteristics, Aggregate Potential, Crushed Stone

Time Period of Content

Fall 2001 – Spring 2002

Parent Theme

NA (FIELDOBS)

Spatial Extent of the Data

Dodge County, Minnesota

Contact Person

Aggregate Resources Mapping Program

Contact Person Organization/Division

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

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 summarize the geological characteristics, surficial geology, and crushed stone potential of the different bedrock units.  To help categorize the geological characteristics and incorporate them into a model to help determine the crushed stone potential of the deposit.

Progress

Complete

Currentness Reference

All data was gathered in the fall of 2001 and compiled in the fall of 2001 through the spring of 2002.

Maintenance Frequency

None Planned

Access Constraints

NA

Use Constraints

NA

Associated Data Sets

County Aggregate Mapping Program datasets for Dodge County, including data on sand and gravel potential, crushed stone potential, field observations, rock piles, and test pit quality data.

Data Quality

 

Attribute Accuracy

 

Logical Consistency

NA

Completeness

The crushed stone resource units were delineated using depth to bedrock information from the county well index, soil surveys, and field observations.  Generalizations were made; this is a reconnaissance-scale study (1:100,000). 

Horizontal Positional Accuracy

1:100,000 for crushed stone.

Vertical Positional Accuracy

NA

Lineage

The first step in determining the distribution of aggregate resources is to understand the recent geological history of the area.  The geological history basically tells us the story, or sequence of events, of when the aggregate and other sediments were deposited.  By understanding this story we can determine where the aggregate was deposited, as well as some of the general characteristics about the material.

The majority of the limestone was found along the eastern river valleys.  Data about the bedrock and depth to bedrock includes well locations with well log information indicating a depth to bedrock; outcrops from the soil information; outcrops observed in the field.  To interpret the depth to bedrock, contour lines were constructed by on-screen digitizing using ARCVIEW.

Source Scale Denominator

1:100,000

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

 

Native Dataset Environment

ArcView 3.1/ArcInfo 8.0.2

Vendor Specific Object Type

Polygon

Tiling Scheme

County

Spatial Object Type

Polygon

Transfer Size

 

Entities -- Attributes

 

Entity-Attribute Overview

The polygons of crushed stone potential.

Entity-Attribute Detailed Citation

ArcView specific fields include shape (i.e., feature type = polygon), area (given in square meters), perimeter (given in meters), Cs02xpy3_ (counter field - assigned by the software), and Cs02xpy3_i (an id usually assigned during theme creation).

The aggregate potential attributes for the polygons are described in the table below.

 

 

Table Name

Field Name

Begin Column

Definition

Valid Values

Descriptions

Cs02xpy3.dbf

Bdrk_mapu

 

Number,4,0

Ex: 305, 239, 303,etc….

Numbers assigned to specific units of bedrock

 

 

Bdrk_desc

 

Text, 60

Ex:  Bedrock-Galena-Prosser/Stewartville (Low)

A short, summarized description of the bedrock mapping units.  Names of units are based on established units for the bedrock of southeastern Minnesota

 

 

Cs_pot_pl1

 

Text, 17

Ex: Limited and Massive Limestone.

Crushed Stone Potential that is depicted on plate 1 (Significant Aggregate Resources).  Bedrock refers to those units that have a high to moderate potential of containing significant crushed stone resources.  Desirability is determined by the crushed stone potential attributes (as described below). Limited implies that there is little to no economic value to the bedrock unit.  Massive Limestone implies that the limestone is thick with few shale partings.

 

 

Cs_pot_pl2

 

Text, 12

High, Moderate, Low, Limited.

Crushed Stone Potential that is depicted on plate 2 (Aggregate Resources).  High, Moderate, and Low refer to the relative potential of the Crushed Stone resources.  Desirability is determined by the Crushed stone potential attributes (as described below).  Limited refers to those units where the depth to crushed stone is greater than 40 feet.

 

Cs_prob

 

Text, 11

Very High, High, Moderately High, Low.

The relative degree of certainty that crushed stone exists within a unit.  Based on air photo interpretations, field observations, CWI, drilling, presence of quarries, etc.  Each unit is relative to the other units and range from very high to very low.

 

Cs_thick

 

Text, 10

Ex: >50

The assumed thickness of the crushed stone (in feet).

 

Cs_overbrd

 

Text, 12

Ex: 0-20, 20-30, 30-40, >40.

 

The assumed range of overburden thickness of a crushed stone deposit (in feet).

 

Cs_quality

 

Text, 10

Ex: High, Limited, Low

The quality of the bedrock unit based on the number of shale partings.  The lower amount of shale, the higher the quality.  Limited includes non-crushed stone units such as sandstones.

 

Cs_min

 

Number,3,0

Ex: 0,5,10,15,20,50

Describes the minimum thickness of the crushed stone unit.

 

Cs_max

 

Number,3,0

Ex: 0, 5, 10, 20, 30, 40, 50

Describes the maximum thickness of the crushed stone unit.

 

Csover_min

 

Number,3,0

Ex: 0, 10,20

Describes the minimum thickness of the overburden covering the crushed stone.

 

Csover_max

 

Number,3,0

Ex: 0, 3, 5, 10, 20, 30

Describes the minimum thickness of the overburden covering the crushed stone.