Examples of Application
the technology was
applied in a number of ore mineral exploration projects.
Magnetite iron ore
survey at South Australian prospects, Australia.
The PMRSE survey was
conducted on the basis of aeromagnetic images of 10 survey areas. The geologic
structure of ore zones was presented by tilted and steeply dipping bodies of
siltstone with a different content of hematite and magnetite. The target of the
PMRSE survey was to perform angle depth soundings to crosscut magnetite ore
bodies and define the content of magnetite and hematite fractions in the ore.
Another target was to define priority areas for subsequent detailed exploration.
The soundings were performed along profiles in the locations specified by the
Client. The total of 182 soundings were conducted with the step of 0.5 and 1.0 m
and the average depth of 350 m. Based on the PMRSE survey of 10 areas, six
priority areas were defined. At different areas from 2 to 4 ore bodies with the
total thickness ranging from 135 to 680 m and the mean content of magnetite from 15 to
27% were determined. A preliminary estimation of magnetite resources within the
profiles surveyed was made.
Manganese ore survey, Kherson and
Dnepropetrovsk regions, Ukraine.
The PMRSE survey was conducted at the area of 25 sq.km. The general geology was
presented by the Southern slope of the Ukrainian crystalline formation with
oxide ore beds occurring inside sandstone-siltstone-clay rock mass of the
Olygocene period. The target was to delineate manganese ore deposits based on
the maximum content of polianite in ore beds. The PMRSE survey was performed
from a car along field roads. The distance between some traverses of the ore
deposit reached 1000 m. At
the areas with an anomalous content of polianite a more detailed mapping was
performed with the traverses made every 200-500 m. To measure the thickness of
ore bodies, their bedding depth and their location in a geological section,
5 soundings were performed in the depth interval from 50 to 80 m
from the ground surface. In addition to the manganese oxide the ore beds were
surveyed for the presence and content of gold. As a result of the PMRSE survey a
boundary of the maximum content of polianite was delineated. The
results of the PMRSE investigations were presented to the Client in form of a
map of the maximum concentration of polianite in the ore bed and three geological
sections plotted on the basis of the soundings performed. Shown on the left is
a fragment of the map and one of three geological sections plotted. The PMRSE
investigations were performed to optimize further geological prospecting work.
Molybdenum mineralization survey, Ukraine.
The survey was
conducted for Public Enterprize “Yuzhukrgueologuiia”, Dnepropetrovsk. The
general geology was presented by a Pre-Cambrian crystalline shield including
gneiss, amphibolites and granites. The survey target was to investigate the
molybdenum mineralization at the depth slices of 100, 200 and 400 m specified by
the Client. The survey was performed afoot along a grid of profiles 600-700 m
long across the strike at a distance of 100 m between them with the measurements
performed every 2-3 m on the profile. The mapping was performed at three depth
slices of 100, 200 and 400 m. To investigate the mineralization of interest
deeper, soundings were performed at four locations to explore the geologic
structure and the molybdenum mineralization to the depth of 600 m. The survey
conducted confirmed the presence of molybdenum mineralization at all depth
slices specified by the Client and showed that the ore zone had an almost
meridional strike and a dip angle of 45-600
to the West. The
maximum content of molybdenite in the ore made up 2%. The PMRSE survey results
were confirmed by drilling and laboratory tests. The results were presented to
the Client in form of 3 slice-maps, graphs of soundings and vertical geological
2005 – Placer gold
survey, South Kirgizia.
The PMRSE survey was
conducted for CJSC International Mining Company, Moscow, at two survey areas
with the total area of 50 hectares. The general geology was presented by the
floodplain alluvium and high terraces of mountain rivers. The survey goal was to
delineate the area of alluvial deposits with the maximum content of placer gold.
The investigations were performed afoot using a grid of profiles along
the riverbed and across the river
terraces with the distance of 20-25 m between profiles. The gold content was
measured every 2-3 m on the profile. Within the delineated gold anomaly areas 45
depth soundings were performed down to the bedrock surface with the average
survey depth of 10 m and the step of readings 10 cm. The PMRSE findings
determined and showed the boundaries of alluvial placers with a little gold
content. The location of alluvial placers in the cross-section of alluvial
terraces was determined using depth soundings. In some sounding locations the
content of associated minerals like platinum and iridium was also measured. The
PMRSE findings were confirmed by samples recovered from shafts.
In 2005 a survey of
remaining chromite reserves was conducted at Yuzhno-Peschansk deposit, Chelyabinsk region,
(Ural, Russia). A similar survey to
estimate the weathered chromite ore reserves was conducted for Pobuzhsk
processing plant. The technology was also used for a preliminary estimation of
the reserves of all kinds of minerals in tailing dumps of processing plants and
gold spoils of thermal power plants.