Tuesday, August 23, 2011
Geologic Map Creation
 Colorado Department of Natural Resources Colorado Geological Survey The Colorado Geological Survey (CGS) is a state agency within the Colorado Department of Natural Resources. Its mission is to help reduce the impact of geologic hazards, promote responsible economic development of mineral and energy resources, provide geologic insight into water resources, and to provide geologic advice and information to a variety of constituencies. |  |
 State Geologic Survey Mapping Component (STATEMAP) is one of three components of the National Cooperative Geologic Mapping Program (NCGMP). Geologic maps produced as part of Colorado's STATEMAP program are used by geoscience professionals and by planners and decision-makers at the state, county, and municipal levels of government. Digital Data Services, Inc (DDS) was hired by the Colorado Geological Survey to produce eight publication quality geologic maps for the Colorado STATEMAP program. |  Maysville, Colorado Geologic Map  Maysville, Colorado Geologic Map- Cross Sections |
 Data was provided by CGS-contracted geologists to be compiled into a geologic report that typically consisted of two plates and a report. Geologists collected field data utilizing GPS-units and created geologic unit features from aerial photography. Field data and geologic units were provided to DDS for cleaning and symbolization. Creating the map plates utilized geologic units, faults, anticline and synclines, strikes and dips, and various other geologic features. | |
 Geologic plates were created by utilizing a “cleaned” USGS topographic quadrangle. Geologic units were processed to create a topologically correct layer. Where map were adjacent to other mapped quadrangles, polygons were edge-matched. All datasets were converted to a standardized format. Final output included both Adobe Acrobat PDF versions and complete datasets for use in ESRI ArcGIS or ESRI ArcReader. |
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 Information from these maps is regularly incorporated into decision-making on a wide variety of local and county-wide issues that include indentifying geologic hazards, protecting ground water resources, locating new municipal wells, siting waste-disposal facilities, identifying potential aggregate resources, and addressing a broad spectrum of land-use concerns. | Helping you make better decisions through information... Digital Data Services, Inc. |
Historic Mine Digitization
Colorado Department of Natural Resources Division of Reclamation Mining & Safety The Colorado Division of Reclamation Mining and Safety is responsible for mineral and energy development, policy, regulation and planning. The division is comprised of the Office of Mined Land Reclamation and the Office of Active and Inactive Mines. |  |
The objective of this project was to provide digital GIS files of certain abandoned mines in the state of Colorado. This entailed converting hard-copy documents into a mapping system (GIS), so that the approximate location of the mines would be readily available and analyzed with current aerial photography, land planning, and land use maps. |  The Southfield Mine- Showing Permit Areas in ESRI ArcMap  The New Horizons Mine Showing Reclaimed & Permit Areas |
The data source provided by CDNR included 420 original surveyed hard-copy maps on mylar, paper, and linen. Field collected GPS data, public land survey data and aerial photography, supplied by DDS, was used as control for the placement of the mine drawings into their proper spatial location. | |
Individual maps and plates were scanned on large-format color scanners. The scanned images were georeferenced to best available controls. RMS error, control sources, and operator notes were recorded for each image. Mine features such as worked out areas, mine workings, faults, adits, slopes, permit boundaries, property boundaries, and other miscellaneous features were digitized and attributed according to client specifications. Final deliverables were a series of shapefiles, (.shp) ESRI personal geodatabases, and extensive metadata files describing the source documents and the processes used for data conversion. A "Statement of Process" document was also created to serve as a specification manual for future digitization projects. |
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This data would be used by miners, geologists, contractors and other entities to safely plan and route around these abandoned mine shafts. The geospatial data also allows for a more focused and effective response to disaster should a collapse occur. | Helping you make better decisions through information... Digital Data Services, Inc. |
Underground Mine Workings
 Agapito Associates, Inc. (AAI) provides consulting services in geo-engineering, mining engineering, and related disciplines. Founded in 1978 to meet the needs of the mineral and energy industries, the firm operates out of offices in Grand Junction and Golden, Colorado. |  |
In the early 1980s, the New Elk Mine was closed and allowed to partially flood. In 2009, AAI. was hired to provide mining engineering services to bring this large underground, multi-seam coal mining operation back into production. AAI faced one major obstacle- although there were drawings showing the location of the underground mine shafts and workings, these drawings only existed in paper format. AAI hired DDS, Inc. to convert the original documents into a fully functional vector (CAD) format. |  Mine Drawings Converted to AutoCAD  Aerial Imagery Base with the AutoCAD Drawing |
The data sources provided by AAI included six 36"x54" blueline copies of the original mine working drawings and GPS surveyed control points. High resolution aerial imagery was used as additional control. | |
Source documents were scanned and georeferenced into a State Plane Coordinate System using various GPS surveyed control points along with aerial imagery. Once a composite raster image was created in its proper geographic location, DDS digitized the underground workings drawing into a 100% editable AutoCAD file. AutoCAD layers included surface, surface labels, geology drillholes, geology drillhole labels, geology structure contours allenseam, geology faults and misc structure features, old workings labels, old workings, and ventilation seals. |
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The delivered AutoCAD files of the underground workings aided AAI in the completion of the initial detailed mine planning required for MSHA plans, permitting, feasibility work, and startup of mining. | Helping you make better decisions through information... Digital Data Services, Inc. |
Abandoned Mine Digitization
| Colorado Department of Natural Resources Colorado Geological Survey The Colorado Geological Survey (CGS) has been involved in characterizing and understanding various aspects of abandoned mine lands in Colorado. Across the state, there are an estimated 23,000 abandoned mine sites on both public and private land. These abandoned mines have a legacy of hazards ranging from environmental issues like water quality degradation and increased sedimentation, to physical hazards associated with the mines themselves. | |
| Colorado State Engineers needed a method to assist in locating and mitigating areas of mine subsidence throughout Colorado. Subsidence is the movement of the earth's surface caused by the collapse of underground mine tunnels or shafts. The location of these mines and their related underground workings existed only in paper format, filed away in a storage room. The purpose of the project was to convert these hard-copy documents into a mapping system (GIS), so that the approximate location of the mines would be readily available and analyzed with current aerial photography, land planning, and land use maps. |  The Morley Mine with Original Map in ESRI ArcMap  The Morley Mine Overlaid on Aerial Photography in ESRI ArcMap |
| The data source provided by CGS included 930 original surveyed hard-copy maps on mylar, paper, and linen. GPS surveyed points of the mine entrances were also supplied as additional control for the registration of these maps into their proper geospatial location. | |
| Individual maps and plates were scanned and georeferenced using aerial photography, public land survey grid, and GPS points as control. Over 25 different mine features were digitized and attributed according to CGS specifications including adits, boreholes, cross sections, faults, isopachs, limits of mining, mine outlines, prf stability, shafts, sinkholes, slope, subsidence inventory, subsidence profiles, surface traces, workings, and other miscellaneous features. Final deliverables were a series of shapefiles and ESRI personal geodatabases. All delivered data was provided with extensive metadata. |
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| This data would be used by miners, geologists, contractors and other entities to safely plan and route around these abandoned mine shafts. The GIS data also allows for a more focused and effective response to disaster should a collapse occur. |
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