aglo

Four possible surveys for finding calcine volume


 
  2D DC resistivity and induced polarization Gravity Seismic tomography Magnetics
Resolution Station spacing: 1-50m. Minimum 20m station spacing. Station spacing ~5m. Recommended grid spacing 1m-2m.
Depth ~ 6*(stn spacing) ~ 0.2*(total line length) ~ 25m for this case ~ 0.2*(max. grid width)
Information type 2D section (smooth) 2D section (blocky) 2D section (smooth) 3D model
Sources of noise · Metal within the ground.
· Nearby electrical activity (natural or man-made ).
· Poor electrical contact with the ground.
· Unknown density anomalies.
· Severe topography.
· Industrial activity.
· Industrial activity.
· Loose surficial materials.
· Ferrous objects above or below ground.
· Susceptibility variations in bedrock.
Recommended deliverables · Raw data images.
· 2D inverted section images.
· Raw data profiles.
· Forward modelled 2D block models .
· Inverted section of velocities. · 3D inversion model.
Approximate daily productivity 1 line per day (up to 48 stns) 30 stns per day 1 line per day (30 stns) 4000 stns per day
Costs per field day* $1100 $750 $1500 $500
Number of crew 3 2 3 1
Processing & reporting costs* $200 per line $200 per day of data $400 per line $200 per day of data

*Notes regarding costs:

  • Positioning + equipment + crew + overhead are included.
  • Fixed additional costs for a site visit regardless of number or type of surveys:
    • Mobilization and de-mobilization: two days at $250 per person.
    • Waiting time (if weather or other conditions cause unavoidable waiting): $200/day per person.
  • Additional costs may be incurred if re-processing is required to emphasis alternative interpretations.
  • Costs are subject to change without notice.

Total costs of doing a survey can be calculated using a simple spreadsheet that could look like the following: