https://youtu.be/5a4NEhrwx3Q [29:35 minutes]
Exploring Abandoned Mines
Published on Dec 13, 2018
Part 2 of three
shows we did on Vancouver island. To get to the historic abandoned
mines we travel 2 KM through a modern mine tunnel. A 2-kilometre
exploration tunnel was completed in March 1989. The tunnel was
constructed to allow access to the Mineral Creek and Linda zones and
for use as a drilling platform. The highest assay as a result of 1988
drilling in the tunnel on the Mineral Creek zone was 19.78 grams per
tonne gold (Assessment Report 18936). Anomalous gold values were
found to be associated with quartz veins in argillaceous cherts and
visible gold was observed. The three main gold-bearing quartz veins
that were developed from the old workings are, from west to east, the
Mac (called the Dunsmuir to the north), the Belcher and the
Waterfall. The veins follow well-developed shear zones on the east
side of Mineral Creek. They are lens-shaped and consist of two
generations of quartz. Pyrite, arsenopyrite and minor sphalerite are
disseminated in the veins and free gold has also been reported. The
Mac vein, the main working, was traced for 75 metres by several
opencuts and two adits. The vein averages 0.14 metre in width,
ranging from 0.07 to 0.45 metre. The vein strikes northeast in the
south part and north in the north part, dipping between 40 to 55
degrees. Sixty three samples taken over the length of the vein
averaged 126.5 grams per tonne gold over 15 centimetres (Assessment
Report 14483). The Belcher vein is exposed in several opencuts and
one adit over 290 metres. It strikes north, dips 40 to 45 degrees and
is up to 1.2 metres wide, averaging 0.20 metres. Sampling in 1973
resulted in assays from 0.1 to 9.95 grams per tonne gold and from 2.1
to 3.4 grams per tonnes silver over 1.5 metre lengths (Assessment
Report 14483). The Waterfall vein is exposed by a few trenches over
35 metres, strikes north and dips about 65 degrees east. Widths range
from 0.08 to 0.75 metre. Sample values were generally low except for
one which assayed 404 grams per tonne gold over 0.15 metres
(Assessment Inferred and indicated geological reserves in three zones
are 471,956 tonnes grading 6.23 grams per tonne gold (Westmin
Resources Ltd. 1990 Annual Report). From 2006 through 2008,
Bitterroot Resources Ltd. drilled 60 holes in the Linda area, most
targeted to test the Linda Zone (Ember Vein). The vein's thickness
ranges from a few centimetres to 1.3 metres and in places it splits
into two or three veins. The gold grades vary from trace up to 467.0
grams per tonne gold and the highest grades are often accompanied by
visible gold grains. One of the better intercepts, from MC2009-E57,
returned a 4.4 metre wide vein/breccia interval of the Ember Zone
averaging 75.35 grams per tonne gold, however, this grade was
enhanced by two relatively narrow intervals of 0.4 metre and 0.6
metre that both assayed greater than 200 grams per tonne gold
(Assessment Report 32204). During drilling of the Ember vein another
quartz vein (HW Zone) was intersected, approximately 30 metres in the
hanging wall, averaging approximately 0.5 metre in thickness. An
intersection of the HW vein in hole MC2009-E53 returned a 0.55 metre
interval grading 137.5 grams per tonne gold and was noted to contain
local visible gold. Another interval, possibly from the HW vein,
returned high-grade silver mineralization, up to 1,170 grams per
tonne silver over 0.15 metre, in hole MC2009-E35 (Assessment Report
32204).
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