Cuyuna Range Underground Mine Shafts

This page last updated: 04/18/2016
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 Natural Resources Research Institute (NRRI), University of Minnesota Duluth
Title Cuyuna Range Underground Mine Shafts
Abstract The Cuyuna Range Underground Mine Shafts data layer contains documented mine shafts on the Cuyuna Range that were digitized from geo-rectified mine maps.
Purpose To digitally compile and map documented underground mining features of the Cuyuna Range for analysis and evaluation of potential use in energy storage and related monitoring and land use planning. Mapping of the Cuyuna Range underground mining features was done in accordance with the standards established during the mapping of the Mesabi Range underground mining features by the MN Department of Natural Resources Division of Lands and Minerals.
Time Period of Content Date
Currentness Reference 1905 - 1967: Time period during which underground mining took place on the Cuyuna Range, beginning with the sinking of the Hobart Shaft and development of several hundred feet of crosscuts at the Sigma mine on the Cuyuna South Range in 1905-1906 and ending with the cessation of underground mining activities at the Armour No. 2 mine on the Cuyuna North Range in 1967.
Progress Complete
Maintenance and Update Frequency As needed
Spatial Extent of Data Cuyuna Iron Range of Central Minnesota
Bounding Coordinates -94.27
Place Keywords Cuyuna Iron Range, Municipalities of Ironton, Crosby, Deerwood, Cuyuna, Trommald, Riverton, and Brainerd.
Theme Keywords Cuyuna Iron Range, underground mine workings, shafts, drifts, mined extents, natural iron ore.
Theme Keyword Thesaurus
Access Constraints None
Use Constraints Conditions of Use:
By using or downloading the data, you signify your agreement to the following conditions of use:
1) The user may not make any use of the data to identify or otherwise infringe on the privacy or confidentiality rights of individuals discovered inadvertently or intentionally in the data.
2) The user will give appropriate attribution to the author(s) of the data in any publication that employs use of the data.
Contact Person Information Julie Oreskovich, Scientist, Minerals, Metallurgy, Mining Group
Natural Resources Research Institute
5013 Miller Trunk Hwy
Duluth, MN  55811
Phone: 218-788-2736
Fax: 218-788-2729
Browse Graphic None available
Associated Data Sets cuyuna_underground_driftsln.shp (mine drifts as polylines), cuyuna_underground_minedextentspy.shp (mined extents as polygons), cuyuna_underground_minespy.shp (all shafts, drifts and mined extents as polygons), cuyuna_underground_mineproperties.shp (mine and ore reserve parcels as polygons), fgdb_cuyuna_undergroundmines (cuyuna_undergroundmines.gdb), and CuyunaRange_UndergroundMineWorkings.xlsx.

Section 2 Data Quality
Attribute Accuracy Source table cuyuna_underground_shaftspt.dbf is derived from all found mine maps and all found historic documentation.
Logical Consistency
Completeness Includes all found documented natural iron ore underground mine shafts on the Cuyuna Iron Range. This does not preclude the existence of additional or more recent mine maps that may indicate the presence of more shafts. (e.g., Croft mine is 630 feet deep. Maps for levels below the 333-foot level were not acquired.)
Horizontal Positional Accuracy Can vary up to 100 feet (30.5 meters); however, within any given mine, integrity was maintained as features were mapped on a 1" = 100' or 1" = 200' mine grid.
Vertical Positional Accuracy Elevations in data sets were taken from the original mine maps.
Lineage Historical maps depicting underground mine workings were acquired as digital images or as paper/mylar sheets that were scanned via a large format scanner to make digital. Digital images were geo-rectified to survey PLS corners where available with at least 4 control points digitized at a minimum of 1:2000. Where unavailable, other means employed included geo-rectification to smaller-scale geo-referenced maps or NAIP imagery. Since mine maps are typically produced on 100-ft x 100-ft or 200-ft x 200-ft grids aligned to geographic north or to the trend of the orebody, the mine grid was used in conjunction with PLS to maintain integrity within a given mine. Points, polylines and polygons representing shafts, drifts and mined extents were digitized from the geo-referenced mine maps. Drifts were digitized as polylines and converted to polygons for Feature Class mines by buffering the polylines to the extent displayed on the mine maps.
Map acquisition, scanning, geo-rectification and digitization took place from 2013 to 2015. Maps and digital map images were obtained from multiple agencies and companies including MN Department of Natural Resources (MNDNR) Division of Lands and Minerals (Hibbing), MNDNR Division of Parks and Trails (CCSRA-Ironton), MN Department of Revenue Minerals Tax Office (Eveleth), Iron Range Research Center (Chisholm), Superior Mineral Resources LLC (Hibbing) and the Office of Surface Mining National Mine Map Repository (Pittsburgh, PA).

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

Section 5 Attributes
Overview Data Elements for Attribute Table cuyuna_underground_shaftspt.dbf:
Detailed Citation
Table Detail:
cuyuna_underground_shaftspt.dbf - Underground mine shafts as points
Field NameValid ValuesDefinitionDefinition Source
Unique identifier.
Name of underground mine.
Shaft_TypeenumeratedType of mine shaft.
Air Shaft
Drainage / Air ShaftOne shaft, varying labels.
Drainage Shaft
Exploration Shaft
Incline ShaftNonvertical shaft.
Main ShaftMain hoisting / man shaft
Secondary ShaftUnlabeled shaft (not the main shaft).
Timber Shaft
Timber Slide(Non-vertical)
Location determined by GPS coordiates.
Proper name label for shaft from original mine map.
Image name of scanned map used to digitize shaft location.

Section 6 Distribution
Publisher Natural Resources Research Institute (NRRI), University of Minnesota Duluth
Publication Date 04/18/2016
Contact Person Information Anda Bellamy, Publications Specialist
Natural Resources Research Institute
5013 Miller Trunk Hwy
Duluth, MN  55811
Phone: 218-788-2653
Fax: 218-788-2729
Distributor's Data Set Identifier cuyuna_underground_shaftspt.shp
Distribution Liability Data are offered with no warranty or claim of fitness for any purpose. The user accepts the data 'as is', and assumes all risks associated with its use. There is no guarantee or representation to the user as to the accuracy, currency, suitability, or reliability of this data for any purpose. In no event shall the Natural Resources Research Institute or the University of Minnesota be liable for any actual, incidental or consequential damages arising from use of these files. By accepting this data, the user agrees not to transmit this data or provide access to it or any part of it to another party unless the user shall include with the data a copy of this disclaimer.
Ordering Instructions See Distribution Contact information.
Online Linkagenone available

Section 7 Metadata Reference
Metadata Date 04/18/2016
Contact Person Information Julie Oreskovich, Scientist, Minerals, Metallurgy, Mining Group
Natural Resources Research Institute
5013 Miller Trunk Hwy
Duluth, MN  55811
Phone: 218-788-2736
Fax: 218-788-2729
Metadata Standard Name Minnesota Geographic Metadata Guidelines
Metadata Standard Version 1.2
Metadata Standard Online Linkage

This page last updated: 04/18/2016
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