

This file contains information on  :

	

	- Located data formats

	- Gridded data formats

	- Plot File Formats

	- Survey equipment and specifications

	- Data processing specifications.

  

                                  

GENERAL

--------

Project:	GOLDFIELDS HENTY PROJECT

AREA: 		RED HILLS 



Survey Company:	GEO INSTRUMENTS

Job Number:	#9002

Date:		20th March 2000







LOCATED DATA 

-------------

Data type: 		Final ASCII located data set.

File:			9002REDHILLS.ldt 	located data

Archive Media: 		CD (Joliet format) 





Field      Width/decimals 	Description

.............................................................................

Column  1	10.0 	line number 'TFNNNaA' ** see Format below **              

Column  2	10.1   	WGS84 northing (metres, AMG Zone 55 )

Column  3	10.1   	WGS84 easting  (metres, AMG Zone 55 )

Column  4	10.1   	AGD84 northing (metres, AMG Zone 55 )

Column  5	10.1    AGD84 easting  (metres, AMG Zone 55 )

Column  6	 8.0   	fiducial            

Column  7	12.6   	time (decimal hours)    

Column  8	 8.2   	radar altimeter (meters)

Column  9	 8.2   	GPS altitude (meters)

Column 10	 8.2   	Digital terrain Model (meters)

Column 11	10.2  	compensated magnetics (nanoTeslas)

Column 12	10.2  	diurnal magnetics ((-)nanoTeslas )

Column 13	10.2  	final magnetics (nanoTeslas)

Column 13	 8.2  	final magnetics, auto gain control (nanoTeslas) ##  see below ##

Column 13	11.5  	final magnetics, first vertical derrivative (nanoTeslas/m)

Column 14	 6.0  	Raw Total Count (Counts)

Column 15	 6.0  	Raw Potassium Count (Counts)

Column 16	 6.0  	Raw Uranium Count (Counts)

Column 17	 6.0	Raw Thorium Count (Counts)

Column 18	 7.1  	Corrected Total Count (Counts)

Column 19	 7.1  	Corrected Potassium Count (Counts)

Column 20	 7.1  	Corrected Uranium Count (Counts)

Column 21	 7.1  	Corrected Thorium Count (Counts)



NOTES:

-------



	Null Value = -999



** LINE NUMBERING: Line numbers are in the form 'TFNNNaA' where

              

	  T   = Line type (2 = traverse, 4 = tie, 9 = test)

	  F   = Flight number

	NNN   = line sequence number

	  a   = Area number

	  A   = line attempt number          

	eg: 2101012 is traverse, flight 1, line 10, area 1,attempt 2



##  Auto Gain control parameters used:

           Half Window 100 points.

           Base removed over 300 points.

       



GRID DATA:

----------

              Algorithm:     		Akima spline

              Grid mesh size:		10 x 10 metres

              Grid filter:   		None

              Format:	     		ER Mapper.  



 Grid Files:		Description:



	DTM	 	Digital terrain Model (meters)

	TMI  	  	Total magnetic Intensity - Diurnal, IGRF, Levelled  (nanoTeslas)

	TMI_1VD_LINE  	First vertical derivative on line data of Total magnetic Intensity

	TMI_1VD_CONV  	First vertical derivative on Gridded data of Total magnetic Intensity

	TMI_AGC	  	Auto gain control on Total magnetic Intensity

	Total_C  	Corrected Total Count (Counts)

	Potas_C		Corrected Potassium Count (Counts)

	Uran_C  	Corrected Uranium Count (Counts)

	Thorium_C	Corrected Thorium Count (Counts)	



	      

PLOT FILE FORMATS

-----------------



	Map files are in HPGL2 format, and can be copied directly to an HPGL2 printer.





DATA ACQUISITION

-----------------

     

              AIRBORNE SURVEY SPECIFICATIONS   

              Survey flown:                  Febuary 2000 

              Traverse line spacing:         25 metres

              Traverse line direction:       090/270 degrees

              Tie line spacing:              250 metres

              Tie line direction:            000/180 degrees

              Survey height:                 Magnetometer on boom at 30m agl

                                             Spectrometer detector in aircraft at 30m agl

              Data acquisition:              Geo Instruments Model G2001 system

              Aircraft:                      Bell 206BIII helicopter VH-JWF 

                                             

              MAGNETOMETER

              Type:                          Geometrics G822A Caesium vapour

              Resolution:                    0.001 nT

              Recording interval:            0.1 sec (approx. 3.0 metres sampling)

              Compensation:                  RMS AADCII real time system

              Installation:                  Magnetometer mounted on forward boom

             

              GAMMA SPECTROMETER

              Type:                          Exploranium GR820 256 channel

              Crystal volume:                Downward looking 16.8 litres

              Recording interval:            1.0 sec (approx. 30 metres sampling)

              Spectral windows:              Window Range            Energy (MeV)

                                             From      To            From       To

              Total Count:                   33        238           0.41       2.81

              Potassium (K40):               116       133           1.37       1.57

              Uranium (Bi214):               140       158           1.66       1.86

              Thorium (Tl208):               205       238           2.41       2.81

              Cosmic:                         -         -            3.00      >6.00

              Calibration:                   Real-time automatic gain stabilisation

                                             based on tracking of the Thorium peak



              NAVIGATION              

              Flight path navigation:        Real time satellite

                                             Differential GPS system

              Navigation equipment:          Ashtec Model GG21 GLONASS/GPS receivers

              Flight path record:            WGS84 lat/long coordinates converted to

                                             

              Radar altimeter:               Sperry AA210

              GPS base station locations:    Fugro, virtual base station.



              DATA PROCESSING

	      ---------------



              MAGNETIC DATA

              The magnetic data has been corrected for regional gradient by

              subtraction of IGRF model 2000.1 and secular variation model

              1995-2000. Diurnal variations have been removed. System parallax

              has been removed. Tieline levelling has been applied.

              Microlevelling has been applied. The mean diurnal value and

              the IGRF base value have been added to the data.

              

              GAMMA SPECTROMETRIC DATA

              NASVD noise reduction applied using 4 retained components

              Live time corrected

              Cosmic and aircraft background removed

              Radon correction method:       Spectral ratioing

              Temperature and pressure corrected

              

              Compton stripping:                               

              Alpha:                         0.2589                  

              Beta:                          0.3610                  

              Gamma:                         0.7559                  

              

              Height attenuated to:          30 metres mean terrain clearance

              Total count:                   0.006205/metre          

              Potassium count:               0.00754/metre          

              Uranium count:                 0.00506/metre          

              Thorium count:                 0.006441/metre          

              

              Sensitivity constants:         VH-JWF                  

              Total Count - 1ngray/hr:       20.28 cps    NOTE: Conversions not used.           

              Potassium - 1%:                70.1 cps                

              Uranium - 1ppm:                8.3 cps                 

              Thorium - 1ppm:                3.88 cps               

              Calibration ranges:            Bairnsdale, Victoria (hovering)

                                             Canberra, ACT (pad calibrations)

                

              

              BIBLIOGRAPHIC REFERENCE

              Surveyed by:                   GeoInstruments Pty Ltd, SYDNEY

              Geo Instruments job number:    9002

              Processed by:                  GeoInstruments Pty Ltd, AR

              Grid production by:            GeoInstruments Pty Ltd

              Grid production date:          March 2000

