Columbia Yukon Explorations Inc.: 2008 NI 43-101 Report Delivers Impressive Resource Reclassification for Storie Property
August 05 2008 - 10:47AM
Marketwired Canada
Columbia Yukon Explorations Inc. (TSX VENTURE:CYU)(FRANKFURT:VOR) (the "Company"
or "Columbia Yukon") is extremely pleased to announce a significant advancement
of the Company's "Storie" molybdenum property deposit.
As previously reported, Watts, Griffis and McOuat Limited ("WGM"), Consulting
Geologists and Engineers of Toronto, Ontario, and Mintec, Incorporated of
Tucson, Arizona, ("Mintec"), were retained by Columbia Yukon to prepare an
updated NI 43-101 Mineral Resource estimate for the Storie molybdenum property
deposit based on the results of historical drilling by Shell Canada in 1979 and
1980 and drilling completed by the Company in 2006 and 2007. The new report (the
"WGM Report") was commissioned, in part, for the objective of reclassifying the
Mineral Resource of the Storie molybdenum deposit from an Inferred category to
Indicated and Inferred categories. The updated NI 43-101 report has been
prepared by Robert M. Kuehnbaum, P.Geo., Senior Associate Geologist with WGM and
Abdullah Arik, AusIMM, Principal MineSight Specialist with Mintec.
2008 MINERAL RESOURCE ESTIMATE
Mintec was also retained by Columbia Yukon to update 3-D modeling of the Storie
deposit. The purpose of the modeling was to assist the Company in further
exploration. The work done by Mintec included:
- Collection of all available drilling and topographic information;
- Development of a 3-D solid of mineralized domain;
- Geostatistical analysis of the data;
- Development of a 3-dimensional exploration block model; and
- Resource estimation and classification.
The number of drillholes used by Mintec in the evaluation was 125. Based upon
the mineralized solid (3-D wireframe model) and the geostatistical analysis of
the assay data, a 3-D model of the deposit was built with 10x10x10 metre-sized
blocks for Mineral Resource estimation. The block grades were interpolated for
all items using the Inverse Distance Cubed Weighting ("ID3") method. Mo grade
was also interpolated using Ordinary Kriging ("OK") and Polygonal methods for
checking and comparison. Outlier high grade intervals were capped for molybdenum
("Mo") within the mineralized domain during the interpolation to restrict the
smearing effect of very high grades. The capping was based on the cumulative
probability plot and statistical analysis of Mo grade distribution. The total
Indicated Mineral Resource in the deposit at 0.030% Mo cutoff is approximately
98 million tonnes grading 0.064% Mo. In addition, the Inferred Mineral Resource
at the same cutoff is about 31 million tonnes grading 0.059% Mo.
The Indicated and Inferred Mineral Resources for Mo at incremental cutoffs from
the different methods are shown as follows:
Summary of the Indicated Mo Mineral Resources at Incremental Cutoffs
--------------------------------------------------------------------------
MOID3 MOKRG MOPLY
-----------------------------------------------------
Grade Grade Grade
Cutoff (Mo%) Tonnage Mo% Tonnage Mo% Tonnage Mo%
--------------------------------------------------------------------------
--------------------------------------------------------------------------
greater than
or equal to 0.030 98,344.7 0.0640 102,438.8 0.0616 91,513.8 0.0702
greater than
or equal to 0.035 84,751.4 0.0690 87,860.5 0.0665 79,678.0 0.0758
greater than
or equal to 0.040 73,447.9 0.0739 75,880.2 0.0711 69,395.7 0.0814
greater than
or equal to 0.050 55,336.7 0.0835 56,667.8 0.0800 53,682.7 0.0922
greater than
or equal to 0.075 27,472.6 0.1061 26,869.0 0.1011 28,651.0 0.1193
greater than
or equal to 0.100 13,049.2 0.1282 11,312.3 0.1220 16,605.6 0.1435
--------------------------------------------------------------------------
Summary of the Inferred Mo Mineral Resources at Incremental Mo Cutoffs
--------------------------------------------------------------------------
MOID3 MOKRG MOPLY
-----------------------------------------------------
Grade Grade Grade
Cutoff (Mo%) Tonnage Mo% Tonnage Mo% Tonnage Mo%
--------------------------------------------------------------------------
--------------------------------------------------------------------------
greater than
or equal to 0.030 30,889.0 0.0587 31,284.1 0.0581 29,619.4 0.0626
greater than
or equal to 0.035 25,602.3 0.0641 25,897.6 0.0634 24,863.4 0.0684
greater than
or equal to 0.040 21,703.0 0.0689 21,988.9 0.0680 20,542.0 0.0749
greater than
or equal to 0.050 15,846.9 0.0779 15,802.9 0.0772 15,742.7 0.0841
greater than
or equal to 0.075 6,926.7 0.1005 6,762.0 0.0995 7,514.1 0.1107
greater than
or equal to 0.100 2,949.2 0.1196 2,767.8 0.1182 4,292.0 0.1282
--------------------------------------------------------------------------
Notes:
- Tonnage times 1000;
- The blocks outside the Economic Pit Design ($30 Mo pit) and the
blocks below 1,250m elevation were excluded and not considered
in the Mineral Resources;
- MOID3 represents Mo grades calculated using ID3 method;
- MOKRG represents Mo grades calculated using Ordinary Kriging;
- MOPLY represents Mo grades calculated using Polygonal method;
- Variable density applied.
At the same cutoff of 0.035% Mo, as reported in the Company's 2007 NI 43-101
Inferred Resource calculation (see News Release dated July 5, 2008), the
reclassified Indicated Resource now stands at 84.75 million tonnes grading
0.069% Mo. In addition, at the 0.035% Mo cutoff, there is an Inferred Resource
of 25.6 million tonnes grading 0.064% Mo.
WGM AND MINTEC CONCLUSIONS AND RECOMMENDATIONS
Columbia Yukon's 2006 and 2007 work focused on verifying and upgrading resources
which were previously known. The Storie molybdenum deposit is presently open to
the north (where it dips to depth), to the east, and to the west. In addition,
there is at least one untested molybdenum occurrence (the "M" Zone) which merits
further investigation. Further work has been recommended. The Company has an
aggressive program (already underway) for 2008, including up to 30,000 metres of
NQ diamond drilling, which is being laid out on 50 m x 50 m centres to delineate
the deposit further to the west where there has only been very little (historic)
drilling.
As well, the Company intends to proceed with the following:
- A Phase III environmental baseline study, including hydrological, climate, and
wildlife (and habitat) assessments (presently underway);
- Metallurgical testing (presently underway); and
- A further updated NI 43-101 compliant Mineral Resource estimate following
Columbia Yukon's 2008 drilling program.
As referred to in the WGM Report, there is a higher grade zone that seems to be
continuous through the center of the deposit. Mintec specifically noted that if
this zone can be better defined geologically or structurally with further
drilling, the block grade smoothing that occurs from the interpolation can be
minimized and the grade and confidence of the Mineral Resource estimates can be
improved. As a result, the Company is currently core drilling several infill
holes at 25 metre spacing in an effort to better define the higher grade zone.
The WGM and Mintec Report has been prepared in compliance with NI 43-101 and
presents a review of the geology and Mineral Resources of Columbia Yukon's
Storie property molybdenum deposit. The Company will be filing the report on
www.SEDAR.com and on its website at www.columbiayukon.com.
This news release has been reviewed and approved by Robert M. Kuehnbaum, M.Sc.,
P.Geo., for WGM and Abdullah Arik, B.Sc., M.S., Aus IMM, for Mintec, who are
acting as independent Qualified Persons for the Company's Storie molybdenum
project in accordance with regulations under NI 43-101.
About Columbia Yukon Explorations Inc.:
Columbia Yukon is a Canadian mineral exploration company focused on the
development of its Storie molybdenum property deposit. The Storie property is
situated about 6 km southwest of Cassiar, British Columbia. Cassiar is located
15 km (by road) west of Highway 37 which provides access to Watson Lake, Yukon,
to the north and Dease Lake and Stewart, British Columbia, to the south.
Columbia Yukon Explorations Inc.
Ronald A. Coombes, President & CEO
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