# Redwood County, Minnesota - Sand and Gravel Potential

This page last updated: 10/02/2022
Metadata created using Minnesota Geographic Metadata Guidelines

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1. Overview
2. Data Quality
3. Data Organization
4. Coordinate System
5. Attributes
6. Distribution - Get Data
7. Metadata Reference

## Section 1: Overview

Originator: Minnesota Department of Natural Resources, Division of Lands and Minerals, Mineral Potential Evaluation Section
Title: Redwood County, Minnesota - Sand and Gravel Potential
Abstract: This dataset consists of information about the geology, geological characteristics, and aggregate potential of crushed-stone potential units. Two attribute fields relate to crushed stone characteristics, including depth to bedrock and bedrock type. These characteristics were used to calculate the aggregate potential of the map unit for crushed stone.
Purpose: To summarize the geological characteristics, bedrock 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.
Time Period of Content Date: 2022
Currentness Reference: Data were gathered in the summer and fall of 2021. Data were compiled and interpreted during the spring and summer of 2022.
Progress: Complete
Maintenance and Update Frequency: None Planned
Spatial Extent of Data: Redwood County, Minnesota
Bounding Coordinates: -94.86
-95.62
44.71
44.19
Place Keywords: Redwood County, Minnesota
Theme Keywords:
Theme Keyword Thesaurus: Aggregate potential, sand and gravel, surficial geology, geomorphology, glacial geology, geological characteristics, probability, quality
Access Constraints:
Use Constraints: Acknowledgement of the Minnesota Department of Natural Resources is appreciated for products derived from these data.
Contact Person Information: ,
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Phone:
Email:
Browse Graphic: None available
Associated Data Sets:

## Section 2: Data Quality

Attribute Accuracy:
Logical Consistency:
Completeness: The sand and gravel potential map units were delineated using ArcGIS 10.6. Delineations are based on the interpretation of high resolution elevation data (LiDAR) using 3 meter cell-sized digital elevation model; several sets of DOQ’s with flight dates ranging from the 1938 to 2019 and at varying scales; and fieldwork including visits to several gravel pits. Digitizing was completed at a scale of 1:24,000. The final data sets represent a reconnaissance-scale survey mapped at 1:50,000.
Horizontal Positional Accuracy:
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. Data about the overburden, bedrock, and depth to bedrock includes well locations with well log information indicating a depth to bedrock; bedrock outcrops from the soil information; bedrock outcrops from MGS; depth to bedrock information from exploratory drilling; bedrock outcrops observed in the field.

## Section 3: Spatial Data Organization (not used in this metadata)

## Section 4: Coordinate System

Horizontal Coordinate Scheme: Universal Transverse Mercator
UTM Zone Number: 15
Horizontal Datum: NAD83
Horizontal Units: meters
Vertical Datum:
Vertical Units:
Depth Datum:
Depth Units:

## Section 5: Attributes

Overview: The polygons were delineated to represent geological features, geological characteristics, and aggregate potential for sand and gravel.
Detailed Citation:
Table Detail:

redw_csp
Field Name | Valid Values | Definition | Definition Source
--- | --- | --- | ---
SGPOT_ID | - | Unique identifier for the field- mapping units. | Esri
Significance | enumerated |  |
| Significant Potential for Crushed-Stone Resources | Includes high and moderate potential map units. The following bedrock lithologic types are interpreted to have significant potential for crushed stone: granite rock, granitic gneiss, and mafic to ultramafic intrusive rock. These bedrock types generally have physical characteristics suitable for producing Class A aggregates, inferred to be thick (greater than 100 feet), and covered by less than 25 feet of overburden. Most of the quarries located within the county are active or inactive dimension-stone or crushed-stone quarries. Dimension-stone quarries are located within rock types that are also suitable for crushed stone aggregate and, for the purpose of this project, are considered as identified crushed-stone resources. |
| Nonsignificant Potential for Crushed-Stone Resources | Includes low and limited potential map units. Nonsignificant is a term used in this assessment to define mapped areas that contain any of the following conditions: lower quality bedrock units, high quality bedrock units with thick overburden (>25 feet), or areas where higher potential may exist but cannot be verified due to a lack of substantiating data which facilitate a lower probability rating. Lower quality bedrock units include gneiss as well as metasedimentary and metavolcanic rocks. These rock types do not have physical characteristics suitable for producing Class A aggregates. No quarries exist within these rock types. |
Potential | enumerated |  |
| High Potential for Crushed Stone Resources | Includes granites, granitic gneiss, and mafic to ultramafic intrusive rock exposed at the land surface or buried by less than 10 feet of overburden. |
| Moderate Potential for Crushed Stone Resources | Includes granites, granitic gneiss, and mafic to ultramafic intrusive rock buried beneath 10 to 25 feet of overburden. |
| Low Potential for Crushed Stone Resources | Includes granites, granitic gneiss, and mafic to ultramafic intrusive rock buried by 25 to 50 feet of overburden. |
| Limited Potential for Crushed Stone Resources | Includes all rock types with >50 feet of overburden. |
Depth_bedrock | - | Range of the overburden thickness, also can be described as the depth to |
Bedrock_Type | enumerated |  |
| Granite | A felsic igneous rock that has medium to coarse crystalline texture. Includes granite, quartz monzonite, and granodiorite based on Minnesota Geological Survey bedrock descriptions. Referred to as “Sacred Heart Granite”. |
| Granite/Gneiss | A coarse-grained crystalline and metamorphic rock. Includes foliated, biotite tonalitic to granodioritic gneiss based on Minnesota Geological Survey bedrock descriptions. Referred to as “Morton Gneiss”. |

## Section 6: Distribution

Publisher: Minnesota Department of Natural Resources (DNR)
Publication Date: 10/04/2022
Contact Person Information: ,
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Phone:
Email:
Distributor's Data Set Identifier: Redwood County Aggregate Resources, Crushed Stone Potential
Distribution Liability: The State of Minnesota makes no representations or warranties express or implied, with respect to the use of the information contained herein regardless of its format or the means of its transmission. There is no guarantee or representation to the user as to the accuracy, currency, suitability, completeness, usefulness, or reliability of this information for any purpose. The user accepts the information “as is." The State of Minnesota assumes no responsibility for loss or damage incurred as a result of any user’s reliance on this information. All maps, reports, data, and other information contained herein are protected by copyright. Permission is granted to copy and use the materials herein for any lawful noncommercial purpose. Any user of this information agrees not to transmit or provide access to all or any part of this information to another party unless the user shall include with the information a copy of this disclaimer.
Ordering Instructions: Redwood County’s aggregate resource spatial datasets (shapefiles & file geodatabase) are included in the file redwooddata.zip, accessible from the MN DNR Aggregate Mapping web page: http://www.dnr.state.mn.us/lands_minerals/aggregate_maps/completed/index.html
The spatial datasets include sand and gravel resource potential, geologic field observations, aggregate pits, Minnesota Geological Survey (MGS) County Well Index (CWI) data points, MnDOT Aggregate Source Information System (ASIS) points, and MnDOT ASIS pit quality table
Online Linkage: I AGREE to the notice in "Distribution Liability" above. Clicking to agree will either begin the download process, link to a service, or provide more instructions. See "Ordering Instructions" above for details.

## Section 7: Metadata Reference

Metadata Date: 10/02/2022
Contact Person Information: ,
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Phone:
Email:
Metadata Standard Name: Minnesota Geographic Metadata Guidelines
Metadata Standard Version: 1.2
Metadata Standard Online Linkage: http://www.mngeo.state.mn.us/committee/standards/mgmg/metadata.htm

This page last updated: 10/02/2022
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