www.arctic-geophysics.com - Geophysical prospecting for
Mining, Geophysics, magnetics
Placer Exploration with Geophysics
- Bedrock depth and topography: channels, reefs, terraces
- Sedimentary stratification: muck, gravel types, sand, silt, clay
- Permafrost and groundwater table
- Mining history: former pits, settling ponds, technogenic gravels
2D Resistivity is providing a model of the
electrical resistivity of the different ground materials/zones.
Because Resistivity is not a time domain method and
measures a material property, the profiles can usually be
well interpreted even in ground with disturbing influences
such as discontinuous permafrost, large boulders, or clay etc.
In 95% of our Resistivity profiles which have been proven by drilling,
trenching or mining, the bedrock depth interpreted by our team has
Combination: Resitivity + Magnetics
In unknown areas it might be advisable to first use 2D Resistivity to
detect potentially placer bearing features such as paleochannels, channel
systems, and clay layers ("false bedrock"). Then it can be checked, if
those features produce increased magnetic data. If this is the case,
the placers can effectively be mapped with Magnetics along the valley.
After this, the magnetogram indicating the possible course of gold placers
can selectively be investigated with 2D Resistivity to reveal the depth
of the placer deposits.
In areas where bedrock or "false bedrock" is known to be shallow and
associated with magnetite, it makes sense to try Magnetics as primary
geophysical method for finding gold placers.
Integrated Placer Prospecting
- Geophysical field measurements
- In-depth geological investigation
- Geochemical results
- Technological data (drilling, trenching, mining)
- Literary information
- Historical sources