Dataset Name

Livengood geophysics

Bibliographic Reference

Burns, L.E., Geoterrex-Dighem, Stevens Exploration Management Corp., Emond, A.M., and Graham, G.R.C., 2015, Livengood mining district electromagnetic and magnetic airborne geophysical survey data compilation: Alaska Division of Geological & Geophysical Surveys Geophysical Report 2015-5. http://doi.org/10.14509/29412

Additional Notes

This publication release is a compilation of all files associated with this geophysics project. We present both the final processed data as well as a broad array of derivative products in various formats. The available file types and associated names are listed below.

Table of Contents

Layer Name: metadata
Layer Description: metadata files, read me files and reports
/metadata/GPR2015-5.faq.html
/metadata/GPR2015-5.txt
/metadata/GPR2015-5.xml

Layer Name: grids_ermapper
Layer Description: geographically registered gridded data, ErMapper ERS format
/grids_ermapper/livengood_analyticsignal
/grids_ermapper/livengood_analyticsignal.ers
/grids_ermapper/livengood_calculated1vd
/grids_ermapper/livengood_calculated1vd.ers
/grids_ermapper/livengood_res56khz
/grids_ermapper/livengood_res56khz.ers
/grids_ermapper/livengood_res56khz.ers.gi
/grids_ermapper/livengood_res56khz.ers.xml
/grids_ermapper/livengood_res7200hz
/grids_ermapper/livengood_res7200hz.ers
/grids_ermapper/livengood_res7200hz.ers.gi
/grids_ermapper/livengood_res7200hz.ers.xml
/grids_ermapper/livengood_res900hz
/grids_ermapper/livengood_res900hz.ers
/grids_ermapper/livengood_res900hz.ers.gi
/grids_ermapper/livengood_res900hz.ers.xml
/grids_ermapper/livengood_sim_magtf
/grids_ermapper/livengood_sim_magtf.ers
/grids_ermapper/readme_livengood_grids_ermapper.txt

Supplemental Information


 >
 >Project Name: Livengood
 >Contracting Agency: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS)
 >DGGS Section: Mineral Resources section
 >Program: Alaska Airborne Geophysical/Geological Mineral Inventory Program
 >Funding Source: Alaska State Legislature
 >Contractor: Stevens Exploration Management Corp.
 >Survey Flown By: CGG Geoterrex-Dighem now CGG (year 2015)
 >CGG Project Number: 659
 >DGGS Contract Manager: Laurel E. Burns
 >Data Acquisition: Digitally acquired
 >Line miles (km): 1048 miles (1676 km)
 >Data Acquisition:
 >Start Date (YYYY-MM-DD): 1998-09-14
 >End Date (YYYY-MM-DD): 1998-09-18
 >Platform: Helicopter
 >Platform: Model: AS-350-B2 Squirrel
 >Survey Altitude Model: Mean terrain clearance (height above ground)
 >Nominal Helicopter Height: 60 metres
 >Nominal Bird Height: 30 metres
 >Traverse: Line Azimuth: 0 degrees / 180 degrees
 >Traverse: Line Spacing: 1/4 mile (400 m)
 >Tie: Line Azimuth: 90 degrees / 270 degrees
 >Tie: Line Spacing: approximately 3 miles (approximately 4800 m)
 >Border lines: present around all non-parallel and non-perpendicular edges
 >Magnetics: Magnetometer: Scintrex cesium sensor, mounted in bird
 >Electromagnetics: Sensor Model: Dighem(V)
 >Navigation System: Sensor: Global Positioning System
 >Navigation System: Sensor: Ashtech/Racal Real-Time Differential Global Positioning System
 >Navigation System: Method: Post-flight differential positioning
 >Additional equipment: Radar and laser altimeters, video camera, and 50/60 Hz monitors
 >
 >Operating frequencies used for the Dighem (V) system.
 >
 >Cx900 1103 Hz separation = 8 m
 >Cp900 877 Hz separation = 8 m
 >Cx5500 5943 Hz separation = 8 m
 >Cp7200 7180 Hz separation = 8 m
 >Cp56k 56360 Hz separation = 6.3 m
 >
 >FLIGHT AND LINE NAMING
 >
 >Example: L11020:29082
 >
 >L = L for transverse(production) T for tie(cross)
 >1 = Area
 >1 = Line number digit 1
 >0 = Line number digit 2
 >2 = Line number digit 3
 >0 = Reflight number
 >:
 >2 = System number digit 1
 >9 = System number digit 2
 >0 = Flight number digit 1
 >8 = Flight number digit 2
 >2 = Flight number digit 3
 >
 >Example: T15021:3089
 >
 >T = T for tie(cross) L for transverse(production)
 >1 = Area
 >5 = Line number digit 1
 >0 = Line number digit 2
 >2 = Line number digit 3
 >1 = Reflight number
 >
 >3 = System number digit 1
 >0 = Flight number digit 1
 >8 = Flight number digit 2
 >9 = Flight number digit 3
 >

Metadata

Metadata is the data about the data and answers "Who, what, when, where, how and why?" about the dataset. Please see the DGGS Metadata README page for information about our metadata.

Use Constraints

Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.

Distribution Contact Information

Metadata Manager
Alaska Division of Geological & Geophysical Surveys
3354 College Road
Fairbanks, AK 99709-3707
Phone Number: (907)451-5020
Fax Number: (907)451-5050
E-mail: dggspubs@alaska.gov