September 16, 2009
VTEM detects the Night Hawk Lake conductor from 705 m above.
Read the case study (PDF)
March 24, 2009
BENTON RESOURCES, ROYAL ROADS & GOLDEN DORY APPROVE 2009 PROGRAM FOR LONG RANGE NICKEL JOINT VENTURE, NEWFOUNDLAND – DRILL TARGETS IDENTIFIED
"... Among the targets selected for further work is a 600 metre long VTEM conductive anomaly described by Geotech Ltd. as “a relatively strong conductor consistent with massive sulphides”. This target has been selected for testing by diamond drilling, and it is anticipated that additional targets will be developed from results of the prospecting and ground geophysical surveys."
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VTEM | Airborne Gravity | AFMAG | Hummingbird | Hawk
GT-1A Airborne Gravimeter
The GT-1A airborne gravimeter brings state-of-the-art design and fully automatic operation to mobile gravimetric measurement. The vertical gravity sensing unit is highly linear and has virtually no cross-coupling, allowing data to be collected during periods of extreme turbulence, changes in flight direction, or turns between lines, thus improving survey efficiency and reducing costs.
Features
- Optimum data quality in a variety of flight conditions
- Data integrity maintained through periods of saturation
- Sensitivity 0.1 mGals
- Static noise level 0.2 mGals
- Low drift (< 0.03 mGals/day corrected)
- 300 Hz sampling and 18 Hz data recording
- Dual dynamic ranges +/- 250 and +/- 500 Gals
- Drape flying to 400 Gals
| Specifications | |
|---|---|
| Range | 9.76 to 9.84 m/sec2 |
| Range of disturbing accelerations | |
| fine range | 250 Gals |
| coarse range | 500 Gals |
| Drift per day (corrected) | < 0.03 mGals |
| RMS error in gravity anomaly estimation | (static mode up to 12 hours on bench) |
| coarse channel | 0.3 to 0.5 mGals |
| fine channel | 0.2 to 0.3 mGals |
| Attitude limits | |
| roll | 45°C |
| pitch | 45°C |
| Operating temperature | +5°C to +50°C |
| Power | |
| operating | 150 W at 27Vdc |
| standby | 50 W at 27Vdc |
| Weight (with base) | 110 kg |
| Dimensions console | 400 x 400 x 600 mm |
| Dimensions base | Ø600 x 300 mm |
| Service life | 30,000 hours |
| Survey Mode | |
|---|---|
| Error in gravity anomaly estimation (RMS) | |
| a) 0.01 Hz cut-off | 0.6 mGals |
| b) 0.0125 Hz cut-off | 1.0 mGal |