In order to prove the economic feasibility for exploitation of ore mineral resources in an acreage in Northern Germany an ORESCAN exploration survey were carried out.
Since 2012 several helicopter-borne surveys for detection and 3D imaging of ore deposits were performed in rough terrain in the Canadian Rocky Mountains
Helicopter-borne survey in Germany has clearly identified ore minerals and iheir distribution
Distribution of seismo-EM attribute OCP
(Ore Concentration Potential) indicating extension and accumulation zones of heavy mineral placers
In co-operation with the well established Canadian specialist Precision GeoSurveys several helicopter-borne multi sensor surveys were performed since 2012.
Main task is to demonstrate the direct detection ability of ORESCAN method and thus supporting conventional Airborne Geophysics for an entry into the Canadian mining market.
Helicopter Survey in Northern Germany
A large area around the villages Midlum and Dorum in Northern Germany is prospective to find heavy mineral placers. The general ore-presence was discovered locally by chance during a drilling campaign for groundwater exploration. The ore minerals are consisting mainly of ilmenite and rutile in varying concentrations within a 4 to 8 m thick sand layer in a depth of about 50 m.
In order to prove the economic feasibility for exploitation of these mineral resources further detailed geophysical explorations were carried out. In the Figure the results of a helicopter-borne seismo-electromagnetic ORESCAN survey within a part of the concession area are represented.
From data acquisition and data processing the distribution of the seismo-EM spectral attribute OCP (Ore Concentration Potential) is obtained.
The geophysical measuring result allows the following threefold geological conclusions:
Threshold-exceeding OCP-values are verifying
that the sensitivity of the system was excellent
to detect the ore occurrence, even though
only semi-conductive ore minerals are present
A continuous level of increased OCP indicates and maps the field extent of the heavy mineral ore deposit
Single OCP anomaly peaks within the ore deposit field are indicating local zones of increased ore accumulations
ORESCAN Surveys by Helicopter in Canada
e.g. partial results:
Lateral Resolution of EM signals indicates ore accumulations
in rough terrain at the Rocky Mountains
Data acquisition (helicopter-borne):
Continuous automatically measurement of the electromagnetic field
Low and slow survey flights
Survey line spacing 50 to 100m
3D inverse modeling
Data evaluation and visualisation:
Overlay contour plots comprising 3D informationen about depth and source signal intensity distribution
2D and 3D visualisation of results
Geological interpretation of geophysical results referring the ore/graphite occurence potential with depth estimation
Advantages & Features
Efficient de-risking tool
Differentiation between presence or absence of metallic ore and graphite deposits
No geographical / surface / infrastructure
No environmental limitations
No need for ground permitting
from preparation through data acquisition and processing to result delivery with final report