Fly ZTEM on Langmuir zones, at the same time get busy with the use of magnetotellurics, been a long holder of this stock, Mr. Hughs needs expand his geophysics program. GLTA. Nickel was on a good rising curve since Mar 30th., it will rise again sure as the sun does.

Geotech's ZTEM system

The ZTEM or Z Axis Tipper Electromagnetic system is an innovative airborne EM system which uses the natural or passive fields of the Earth as the source of transmitted energy. The Earth and Ionosphere, both conductive, act as a waveguide to “transmit” the source energy great distances. Due to the manner in which they propagate, these natural fields are planar and horizontal. Any vertical feld is caused by conductivity contrasts in the Earth. The vertical EM field is referenced to the horizontal EM field as measured by a set of horizontal base station coils. The proprietary receiver design using the advantages of modern digital electronics and signal processing delivers exceptionally low-noise levels.

Features

• ZTEM data is closely related to resistivity/conductivity mapping of the subsurface.
• Passive EM technique – does not have a man-made transmitter.
• Frequency range – “audio range” Geotech’s airborne AFMAG can operate from 22 to 2800 Hz (depending on the signal strength).
• Superior Exploration Depth – over 2,000 metres from numerical simulation.
• Low Frequency of 22 Hertz for penetration through conductive cover.
• Excellent resistivity discrimination and detection of weak anomalies due to the nature of the natural EM fields.
• System is easily transportable – can be disassembled for packaging in relatively small units for shipping to surveys around the world.
• Two systems now available with over 20,000 line km of commercial surveys flown.

Geotech's ZTEM system - basestation

Specifications

Airborne Receiver

Geotech Z-Axis Tipper (Z-TEM)

The airborne loop is isolated from most vibrations by a patented suspension system and is encased in a fibreglass shell. It is towed from the helicopter using a 90 metre long cable. The cable is also used to transmit the measured EM signals back to the data acquisition system.

Base Station Receivers

The two base station receiver coils are set up perpendicular to each other. The orientation of both units is not critical as the horizontal field can be reprojected onto the two orientations of the survey flight.

Attitude Measurement Sensors

The attitude of the airborne coil must be monitored in order to remove the cross coupling between the horizontal and vertical EM field. Three GPS receivers are placed on the Z-TEM airborne coil. The data is processed using one of the GPS receivers as a moving base station and calculates the relative positions of the other two receivers to yield a very accurate attitude measurement.

Ontario Geophysical Test Range

Z-TEM data showing good correlation with, and mapping of geology

Inline, inphase @ 49Hz 90 degree phase shifted Mining Companies Increasingly Use MT Methods As the search for new ore deposits moves ever deeper, both major and junior mining companies are increasingly using MT and AMT for both brownfields and greenfields exploration. INCO's 1991 proof-of-concept study in Sudbury, Ontario started this trend with two AMT sites that sensed a 1750 meter-deep nickel deposit. Falconbridge followed with a feasibility study in 1996 that accurately located two Ni-Cu mineralized zones at ~800 m and ~1350 m. Since then, Falconbridge has acquired over 2000 MT/AMT sites in the Sudbury basin and elsewhere. In 1999, INCO acquired ~1500 MT/AMT sites at the Voisey's Bay nickel deposit discovered in 1996. Today, thousands of MT/AMT sites are measured every year by worldwide companies, demonstrating the value that industry players place on these techniques. Tomorrow's mineral discoveries will likely come from depths greater than known ore bodies and may be covered by thick layers of overburden. Finding these deposits requires more sophisticated technology than traditional prospecting methods. Phoenix MT/AMT technology answers that need. MT/AMT is a proven supplement or alternative to expensive traditional approaches like diamond drilling and borehole geophysics and less-costly but shallow-penetrating airborne EM techniques. deep rapid reconnaissance and detailed follow-up From near-surface down to any practical drilling depth and beyond, MT allows rapid reconnaissance of areas as large as tens of square kilometers, while detecting conductive zones to 2000 m and deeper. Closely spaced stations along lines or nets provide data redundancy, high lateral resolution, and a continuous picture of the subsurface resistivity structure. In a two-pass methodology, station and line spacing are as wide as possible in the first pass to keep cost to a minimum. Once areas of interest have been identified, a second pass with more stations at closer spacing increases resolution. The result is rapid, accurate, and cost-effective identification of conductive mineralized zones. Plan maps of apparent resisitivity and phase highlight conductive bodies at specific depths (click picture to enlarge it). rapid, cost-effective mapping of conductive zones Equipment weighs only 30 kg per site, so it's portable by backpack, ATV, snowmobile, or helicopter, from tundra to jungle, in any season. This logistic simplicity reduces cost and increases productivity. The small footprint and environmentally benign installation make the technique practical almost anywhere. Flexible site location and offline sensitivity allow meaningful profiles to be constructed without the rigid grid of methods like seismic and IP. Induction vectors indicate the direction and relative strength of offline conductors and are especially useful where the surface is resistive or frozen (no electrodes required). MT/AMT sees through the thick conductive clay (impenetrable by airborne or other surface techniques) that covers many prospective areas.

Simplified geology

Inline, inphase @ 247Hz 90 degree phase shifted