Mongolia - General Mining

54
5 - Independent Geological Report - Australia
interest were black chlorite schists, limestones and
dolomites. Several quartz-reefs were also noted and
sampled.
Targeted during this visit were the ‘black calcite’
outcrops, which earlier prospecting has found to be
highly anomalous in silver; in particular the ‘black
calcite’ range, which was noted during RW’s 2006
helicopter reconnaissance to persist for over six
kilometres strike length.
The independent geologist was able to follow this
feature on the ground and to sample it over 1,500
m length. He found that it was indeed open in both
the north and the south. He has formed the opinion
that this be the Halls Creek Fault or an associated
structure. Over half the samples were collected
from this 30-50m wide zone which swells up to
over 100m. The NNE-SSW striking feature typically
consists of dark green (‘black’) chlorite schist forming
dark ridges. While the schist consists of large slatelike
plates, it is often tightly folded. Within and to
the west of this prominent schist are a number of
calcite and dolomite lenses and layers. These are of
a few cm to nearly a metre thick. There are many of
these lenses and layers, comprising 10-30% of the
30-50m wide target-zone. They consist of calcite and
dolomite of light to dark (gray) colour, often with
blobs and irregular veins of milky quartz. Malachite
was frequently observed in the carbonate lenses.
Galena was found in one outcrop. Sampling by the
2.5.5 Black Hill Proposed Exploration
and Budget
It is recommended that detailed prospecting,
geological mapping and geochemical sampling
comprise the initial exploration phase. The target zones
can be traced on satellite images and air-photographs,
due to the dark ridges and the specific vegetation
cover as well as the lighter colours of limestone,
dolomite, ankerite and calcrete in the slopes and flats.
independent geologist could not confirm the earlier
silver values obtained from within the ELA area. He
found, however, several copper occurrences, with of
up to 1.3% Cu in rock chip samples. The majority of
samples had also elevated Mn values.
2.5.4 Potential
The stated exploration targets of this project are
silver-bearing carbonate-rich zones and locations of
black calcite.
Black calcite is a common associate of silver/
manganese ores found in the southwestern silver
fields of the USA. This association is reported, among
others, from the Silver District in Arizona (S.B. Keith
1978), from the Western Mining Districts of the USA
(Hewett & Radtke 1967), as well as from Sonora,
Mexico (Silvermex 2007).
The Halls Creek Fault Zone hosts a number of
hydrothermal vein type copper occurrences in mafic
Tickalara Metamorphics, immediately to the north of
the ELA, and the hosting structures extend into the
GMM tenement area.
Gold occurrences have been described from the
Eastern Zone of the Lamboo Group (Report 74 of
the GSWA). Since the ELA straddles this zone, its
gold potential should be examined as well.
Proposed Work Yr 1 Yr 2 Total
Road cutting, prospecting, sampling $25,000 $50,000 $75,000
Geophysics $50,000 $50,000
Drilling ten RC holes $90,000 $90,000
Assaying $10,000 $25,000 $35,000
Planning, supervising, reporting $20,000 $50,000 $70,000
Total $105,000 + $215,000 = $ 320,000