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Portable Cesium Magnetometer - Model
G-859 Mineral Mag
A Professional Magnetic Mapping System
For Minerals, Petroleum and Geologic
Surveys |
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Excellent Performance:
Low Noise/High Sensitivity, best in the industry – 0.008nT/Hz RMS – and world wide operation
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Very Fast – Log mag and
GPS at up to 5 samples per second for economic large area
surveys at high sample density
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Integrated GPS/Backpack
– Includes non-magnetic backpack and Novatel™ WAAS /
EGNOS ready GPS
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Low AC Field Interference
– Best in the industry for rejecting AC power line grid
noise (50/60 Hz)
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Easy-to-use – Simple
setup and rapid in-field map generation with free
MagMap2000™ software
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Reliability – Our Cesium
sensors never need calibration or factory
realignment. Designed for extreme ruggedness and
reliability.
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Designed for large surveys mining/oil/gas – This
versatile tool is specially designed for large area surveys
with 8 hr data storage capacity and two 6 hr battery packs
This
new low-cost Cesium vapor magnetometer system offers the
mining/oil/gas survey companies the best total field magnetic
survey tool available. Based on our industry standard G-858
MagMapper system , the G-859 incorporates all of the
reliability and proven performance in a lightweight survey
package with integrated WAAS/EGNOS enabled Novatel™
GPS.
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Most magnetic surveys for minerals,
oil, and natural gas are initially conducted as airborne
surveys.
The map abovet shows an area of approximately 1.5Km by
1.5Km and was produced from data collected from an airborne
survey. The aircraft height was 70m and the line spacing 120m.
The sample interval was 0.2s or approximately 14m with a grid
cell size of 20m.
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Operation
The
G−859 Mining Mag uses a graphical interface to make survey
design and data acquisition quick and efficient. A "Simple" or
"Mapped" Mode uses line numbers and known staked reference
points to define the map parameters. Or the user may use the
integrated Novatel Smart Antenna™ GPS for mapping positions
automatically. Position information may come from an external
GPS, from regularly spaced fiducial marks input by the
operator or both. At any time, the user may switch to
"profile" mode to observe the last 5 data lines as stacked
profiles.
Data is collected in up to 5
separate survey files and transferred via high speed RS−232
data link (or USB with converter) to a computer for further
analysis and map generation. The full featured graphical data
editing program MagMap2000 is provided to allow repositioning,
realignment, GPS smoothing, data filtering and interpolation
of the data. After editing, the data is formatted in either
Surfer for Windows or Geosoft formats for further plotting and
analysis
Speed and
Efficiency
G−859 data acquisition offers either
continuous (automatic) or discrete station recording. Data
quality is uniformly high and lower costs are inherent for
most projects due to the high sampling rate of the instrument
in continuous mode. This allows the operator to survey an area
at a fast pace, covering as much as 10 times more area in a
given time period than other magnetometers.
Reliable,
rugged and cost effective
In addition to
its speed and sensitivity, the G-859 is also reliable, economical, and easy to use. Electrical connectors on
the G-859's sensor have been eliminated in order to increase
reliability and reduce setup time. The G-859's internal
firmware has been streamlined to include those features
important for mining exploration. We are so confident in
the improved design of the G−859 that it comes with 2 Year Warranty.
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The map on the right is was obtained
from a ground survey of the same 1.5Km by 1.5Km area as shown
above but this data was acquired using a portable cesium
magnetometer with its backpack-mounted sensor positioned at a
height of 3 m. The line spacing was 20m and the sample
interval 1m. The grid cell size is 5m.
The land data offers significantly
greater anomaly definition and improved resolution compared to
the airborne presentation. Individual structures such
as lithologic contacts, drainage channels, and alteration
zones are evident. In addition, the land data reveals a NW-SE
trending structural grain not seen in the airborne data. This
detailed information can be used to focus geologic mapping,
sampling, and drilling programs for greater efficiency.
Most importantly, these high resolution land based data also
provide the basis for high resolution numerical interpretation
that will better reveal the subsurface structures.
This
data was collected in the Goonumbla region of Australia,
provided courtesy of North
Exploration. |
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Applications
The
concentration of magnetic minerals often varies with geological formation
or chemical alteration and can indicate hydrocarbon bearing
structures or economic mineral deposits. A primary application of
the G−859 Mineral Mapper is surveying for minerals and oil/gas exploration
programs. The G-859 is an excellent instrument for use in academic
research and education.and can also be used for local environmental
studies such as mapping waste sites, locating buried metal drums and
storage tanks buried pipelines, well-heads and other sizable ferrous
structures
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Data Quality
The
G−859 system produces raw data of the highest quality. Data is
digitally recorded in compressed form in high capacity RAM and later
transferred to a computer for permanent storage and
processing. Sensitivity, resolution and recording rate of the
cesium magnetometer are user selectable as well as mapped survey
grid coordinates or GPS position data. The system is ruggedly
packaged for extreme field conditions. Data storage is
sufficient to record 8 hours of data at the maximum rate of 5 Hz.
Battery life is approximately 8 hours powering both the Magnetometer
and Novatel Smart Antenna™
GPS |
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Downloading, Data Management and
Mapping
A basic
software package MagMap2000 is supplied as an integral part of the G−859
system and provides:
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Transfer of the raw magnetometer, base
station and other survey data to the client PC
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Standard corrections for position errors,
transients, and time varying errors (diurnal)
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GPS track plot with adjustable smoothing
and independent point editing
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Repositioning, linear interpolation and
format of corrected data into X, Y, Z or Latitude/Longitude ASCII
columnar values for use with Surfer for Windows, Geosoft or other client
supplied contouring programs.
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Conversion of GPS to UTM coordinate system
using a selected Datum.
In addition to the standard MagMap2000
download and editing software, Geometrics is pleased to offer MagPick™, a
full featured potential field analysis package with excellent profile and
contour map generation capability.
MagPick™ can perform source body inversion,
reduction to the pole, upward continuation and a variety of other
transforms and gradient extractions. We are also pleased to offer a
Windows™ version of CSAZII™, a world total field map, field inclination
and sensor orientation program for performing surveys worldwide in any
survey direction. MagMap2000, MagPick™ and CSAZII™ are available on our
website for free download. Manuals for these programs are supplied
as internal documents in PDF format.
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Novatel Smart Antenna™
Accurate data positions are as
important as accurate magnetic field measurements and Geometrics is
pleased to include the Novatel Smart Antenna™ as an integral part of
the G-859 system. This small light-weight, all-in-one GPS Antenna
and electronics package is WAAS/EGNOS ready for <1.5m
positioning.
Novatel GPS
Antenna/receiver
The Smart Antenna™ systems is installed on
Geometrics non-magnetic back pack and carefully screened and
degaussed for minimum magnetic interference.
The Smart Antenna™ is designed to be
quickly assembled and installed on the backpack, with special
mounting studs and a cable wiring harness for data and power
distribution. The storage case allows the main components to be
stored as a unit providing minimum assembly at the job site. The
storage case is a rugged reusable fiberglass and aluminum travel
case with handles and wheels for easy transport.
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Specifications:
Please downlosd
Data Sheet
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G-859
and GPS Re-Usable Shipping Case with foam padding and transport
wheels |
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