Metadata: Exploration, Scientific, and Engineering Boring Hole Locations Stored in the Drill Core Library

Exploration, Scientific, and Engineering Boring Hole Locations Stored in the Drill Core Library

This page last updated: 2018-07-13 12:24:30
Metadata created using Minnesota Geographic Metadata Guidelines

Go to Section:
  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 (DNR)

Title: Exploration, Scientific, and Engineering Boring Hole Locations Stored in the Drill Core Library

Abstract: Location data for exploratory, sciencific, or engineering boring samples stored in the DNR's Drill Core Library in Hibbing, Minnesota. For more information on the drill core library please vist the DNR's webpage:

Purpose: The primary purpose of the Drill Core Library is to receive, preserve, and make available boring samples to serve the state policy for mineral development (M.S. 93.001). This means that environmental impacts are reduced when existing drill samples can be re-used multiple times such that the total number of drill holes is reduced. The drill samples have also proven to be extremely valuable for academic researchers, such as university professors and graduate students. Many graduate student theses have been possible largely based upon the free access to drill core samples in this library. Further, the drill samples are available for environmental research, such as to understand the natural background trace element composition of the bedrock materials.

The majority of drill samples in the library are public data and available for viewing. Most exploratory boring samples are delivered to the library in fulfillment of statutory requirements which have been in effect since 1980.

If a state mineral lease terminates, then the drill cores associated with that lease become state property and public data. The drill samples remain public data even if a new lease becomes active on the same mining unit.

Exploratory Boring Procedures- Minnesota Statutes 103I.601:
Submission of Data from Exploratory Borings- Minnesota Statutes 103I.605:

Those same statutes also identify that some core samples and related data are not public data meaning they are not viewable by the public. This is due to the core sample and data being on an active state minerals lease. The DNR must follow this law. If you wish to view confidential core, then you need to be an employee of the state mineral lessee or have written permission from the state mineral lessee.

Time Period of Content Date: 03/24/2017

Currentness Reference:

Progress: Planned

Maintenance and Update Frequency: As needed

Spatial Extent of Data: Statewide

Bounding Coordinates: -97.23

Place Keywords: Minnesota

Theme Keywords: borings, drill core library, mineral exploration, scientific, engineering

Theme Keyword Thesaurus:

Access Constraints:

Use Constraints: Disclaimer and Copyright Protection: Maps, Reports, Data, and Other Information
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.

Contact Person Information: James Olson, GIS Analyst
Minnesota DNR - Lands and Minerals
500 Lafayette Rd
Saint Paul, MN  55155
Phone: 651-259-5429

Browse Graphic: Click to view a data sample.

Associated Data Sets: See the Minnesota Well Index (AKA CWI) for more information on all borings not just those stored in the Drill Core Library.

See GIS data from the DNR's Mineral Exploration Document Collections (Minarchive and Lehmann Family Fund). These collections provide GIS data that links to related mineral exploration documents stored online. They can include information on borings like maps, logs, and geochemistry.

The DNR's Mineral Potential Evaulation Section has completed drill core evaulation projects on select borings stored in the Drill Core Library. For more information see the DNR's Mineral Potential Section Project Boundaries and Project Data.

Interact with the data along with several geology and minerals layers in the Drill Core Library web map:

Section 2: Data Quality

Attribute Accuracy:

Logical Consistency:

Completeness: Incomplete

Horizontal Positional Accuracy: The location information (XY_SOURCE) for a boring was derived from different sources from GPS to various scale maps. As a result the locations have varying degrees of accuracy.

Vertical Positional Accuracy:

Lineage: The data provided has been gathered and entered from various sources. These sources include DNR's collection of mineral exploration documents (AKA Assessment Files), exploration company supplied information, Minnesota Department of Health Forms, DNR Drill Site Inspections, DNR Drill Core Library Staff, Minnesota Department of Transportation, Natural Resources Research Institute, and the Minnesota Geological Survey. Please note that a quality check of the entire dataset has not been undertaken. As a result the user of this data should view it as a reference. Furthermore the user is encouraged to do additional research if interested in certain boring locations (See Associated Data Sets).

Source Scale: Source layer ddh2004: -1

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: Not Applicable

Vertical Units: Not Applicable

Depth Datum: Not Applicable

Depth Units: Not Applicable

Section 5: Attributes

Overview: DhName - Borehole name assigned by company or agency sponsoring the borehole.
DnrNum - MNDNR unique inventory number.
Building - Drill Core Library storage building number.
Bays - The bay or bays that contain the borehole core/cuttings.
CorStart - Depth of beginning of cored interval units in feet.
CorEnd - Depth of ending of cored interval units in feet.
CorInt - Length of cored interval units in feet.
CWINum - Minnesota Geological Survey County Well Index (CWI) unique number. This number uses the MDH number though adds zeros in front of it. On occastion there can be more than one number for a given drill hole. The compiler will choose the best number to represent the drill hole.
EndDate - Date of completion of drilling of the borehole (ex. month/day/year; 01/01/2001). If borehole is wedged, or later re-entered and deepened (often also called a wedge), a separate borehole record is entered for each wedge. For earlier drill holes where completed.
DrillFor - Name of the Company or Agency that sponsored the borehole.
DrillType - Either Exploratory, Scientific, or Engineering (MnDOT)
UTM8315_X - X utm coordinate of best available at time collar coordinate, converted to NAD83, UTM15 in units of meters.
UTM8315_Y - Y utm coordinate of best available at time collar coordinate, converted to NAD83, UTM15 in units of meters.
Azimuth - Best available borehole azimuth as collared, in degrees planview clockwise from north (north = 360, vertical hole = 0).
Dip - DNR Official of best available borehole dip as collared, in degrees from horizontal (-90 for vertical).
XY_Source - Source of X and Y Coordinates
CollarType - Where known, identifies the relative position of the borehole collar (typically Surface, Wedge, In Pit, In-Water, or Underground).
CorLoc - Where is the core or cuttings for this boring? (ex. Drill Core Library, Minnersota Geological Survey, Unknown, Not available)
Material - If known is the material core, cuttings, or both.
DataPublic - Is the core or cuttings sample public data or nonpublic mineral data. Prior to any viewing request the DNR will review this field to confirm.
CutStart - Depth of beginning of cuttings interval units in feet.
CutEnd - Depth of ending of cuttings interval units in feet.
CutInt - Length of cuttings interval units in feet.
DCLSampRec - Are there Drill Core Sampling Events recorded?
NbrSampRec - Number of sampled records
OthrMatrls - What other materials (thin sections, pulps, rejects) are available from this boring?
NbrThnSec - Number of thin sections
NmbrPulps - Number of pulps
NmbrReject - Number of rejects
NbrPulpRej - Number of pulps and rejects
PriMthd - Drilling method used to start coring. Primary drilling method, typically diamond coring, reverse circulation or rotary sonic.
PriDia - Diameter of drill bit (in feet)
PriStart - Depth at which bedrock coring begins in units of feet
InitMthd - Drilling method used to start the hole (other than coring)
InitDia - Diameter of bit (in feet)
InitStart - Depth at which initial method began (in feet)
SecMthd - Secondary drilling method (rare). Sometimes a reverse circulation or rotary sonic rig is initially used in overburden prior to use of the main drill coring or sampling method.
SecDia - Diameter of bit
SecStart - Depth at which secondary coring began
Dep2Bdrk - Depth to bedrock, in units of feet, if drilling is vertical.
Dep2Othr - Depth to another significant reference horizon (such as depth to PreCambrian, depth to Giant's Range, depth to Pokegama Quartzite, etc.) in units of feet.
Dep2ORef - Name of the other significant reference horizon recorded in the previous field.
MdhFormWeb - Link to MDH online repository of digital exploratory sealing report. This is not the scanned original document. It is based on the original document, inputted by MDH and MGS.
GeolLogs - Are their Geologic Logs Available at the DNR?

Detailed Citation:

Table Detail:

Section 6: Distribution

Publisher: Minnesota Department of Natural Resources (DNR)

Publication Date: 05/09/2017

Contact Person Information: Zeb Thomas, GIS Data Systems Coordinator
Minnesota DNR - GIS
500 Lafayette Rd
Saint Paul, MN  55155
Phone: 651-259-5637

Distributor's Data Set Identifier:

Distribution Liability: The Minnesota Department of Natural Resources General Geographic Data License Agreement is online:

Ordering Instructions: Please visit the download page for this dataset on the Minnesota Geospatial Commons website using the web link below (Online Linkage).

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: 2018-07-13 12:24:30

Contact Person Information: James Olson, GIS Analyst
Minnesota DNR - Lands and Minerals
500 Lafayette Rd
Saint Paul, MN  55155
Phone: 651-259-5429

Metadata Standard Name: Minnesota Geographic Metadata Guidelines

Metadata Standard Version: 1.2

This page last updated: 2018-07-13 12:24:30
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