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October, 2014
and northwest linears are also observed. Short strike length, northeasterly trending linears,
although abundant in the study area, have been largely ignored for the purposes of this study,
as they reflect for the most part effects of the most recent glaciation.
Figure 12 - Property scale linears based on topography.
Figure 13 - Property scale linears based on the digital elevation model.
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The Property is bracketed by a number of topographic linears that could be important from a
mineralization perspective. These include an east-northeastern linear on the north, a
northeastern linear on the south and northwest and north-northeast on the east.
These same linear directions are reflected in the digital elevation model, although they are less
abundant, perhaps due to the particular sun angle used in this model.
Linears based on Magnetics
Both the total field and 1VD magnetic data were used at the property scale to help better define
local trends (Figures 14 and 15). The total magnetic field at Xama is dominated by an irregular
magnetic low on the north side of the property.
In terms of exploration interest, two north-south linears and an east-northeast linear are
associated with embayments on the south side of the mag low. Mapping suggests that the
magnetic low is underlain mainly by Nithi phase quartz monzonite to monzogranite of the
Endako Batholith, while the Property is underlain by Limit Lake Phase quartz diorite and
Kasalka Group andesites (see Figures 3, 16). It is possible that these linears, and the weak
magnetic lows extending south into the area of the Property, are due to the destruction of
magnetite by hydrothermal solutions focused along structures reflected by these linears. Both
the Owl Zone and the Gel Zone lie along two of these linears, within the western magnetic
embayment.
Figure 14 - Property scale linears based on total field magnetics.
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Although the linear pattern from the first vertical derivative magnetics shows a more complex
pattern than the total field magnetics, the patterns are similar. The key directions are northeast
and north-south.
Figure 15 - Property scale linears based on first vertical derivative magnetics.
Summary of Property (1:100,000) Scale Linears
All linears from the property scale datasets were compiled and superimposed onto the geology
base (Figure 16). The heavy dashed lines represent three or more coincident linears from
different data sets, while the thin dashed lines are single or double linears.
According to BCGS MapPlace geology, mineralization at the Owl and Gel Zones is within
Endako Batholith intrusives adjacent to its northwest trending fault contact with Kasalka Group
volcanics to the west. Actual Property geology is poorly known due to lack of exposure. The
most important mineralization appears to be associated with the Casey quartz monzonite and
related Red Granite dikes (Bysouth, 2011), the same rocks that host the Endako porphyry
deposit.
As can be seen in the central part of Figure 16, many of the property scale linears are sub-
parallel to, but not exactly coincident with, mapped faults and contacts from the BCGS
MapPlace geology map. In many cases, they are probably reflecting the same features, but in
others, they are clearly distinct. According to Lowe et al, (2001), most of these, especially NE
and NW structures, would be post-mineral.
A key structure is the northeast trending linear just south of the Property that is mapped as a
fault and is a strong topographic lineament. It is also reflected in the magnetics, but less
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strongly. There are other parallel northeast linears, as well as steeper north-northeast linears
that could be related to this structure. The northwest to north-northwesterly linears are also
important and are also reflected in a number of mapped structures and contacts (Figure 16).
Not reflected in the mapped geology are the north-south linears that appear to be important and
potentially related to the known mineralization, as reflected mainly in the magnetics as lows
(magnetite destruction due to hydrothermal fluids?) and, more regionally, Bouger gravity trends.
The most important of these cuts directly through the Gel Zone.
Figure 16 - Compilation of property scale linears over BCGS geology and faults (lines
thicken with the number of linears superimposed on top of each other; 3 or more are
thicker than 2 or less).
T
ARGETS FROM THE
S
TRUCTURAL
S
TUDY
The target deposit type at Xama is a porphyry Mo (Cu) deposit, similar to Endako or,
secondarily, a bulk tonnage Au-Ag deposit, such as Blackwater Davidson. Both deposit types
would be expected to be related to high level intrusive activity and demonstrate structural
control. The key exploration target suggested by this study is defined by the known
mineralization, the Owl and Gel Zones, the magnetic low embayment in the area of these
showings that could be a reflection of magnetite destruction by mineralizing fluids and linears,
likely structures, that are reflected in the magnetic data and may control the emplacement of
intrusions and related hydrothermal activity.
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Figure 17 - Compilation of property scale linears with target location (red circle).
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CONCLUSIONS
The Xama property holds potential for the discovery of a porphyry molybdenum deposit similar
to Endako, 21 km to the northwest. Anomalous molybdenum values in stream sediments and
soils resulted in the discovery of porphyry style molybdenum mineralization at the Gel and Owl
showing areas by Amax and Anaconda in the late 1960’s.
The Property lies within eastern edge of the Stikine Terrane, near its boundary with the Cache
Creek Terrane and immediately south of the Skeena Arch. The Endako Batholith is the key
geologic feature of the area, underlying much of the claim group and extending for almost 100
km in a northwestern direction, with a width of up to 40 km. It is a composite batholith that
comprises five temporally distinct plutonic suites, only one of which is known to be mineralized.
The Property is underlain by plutonic rocks of the Upper Jurassic Francois Lake Suite of the
Endako Batholith. A few outcrops of Casey quartz monzonite, belonging to the Endako Suite,
the same suite that hosts the Endako deposit, occur in the southern and central parts of the
Property and quartz diorite is well exposed along the high ridge south of the claims. Two areas
of molybdenite mineralization have been defined on the Property. The largest of these is the Gel
Zone which lies in the southeast part of the Property east of Skip Creek. It has been defined by
a line of eight percussion drill holes. The second area, the Owl Zone, lies in the southwest
quadrant west of Skip Creek. It has been defined by three percussion holes drilled near two
areas of surface quartz-molybdenite mineralization. Depth continuation of molybdenite
mineralization was confirmed in both areas.
In this study, topographic features and airborne geophysical patterns, viewed as overlays on the
BC government MapPlace web site at 1:1,500,000 (regional) and 1:100,000 (local) scales have
been used to define linear features. It is assumed that, in many cases, these features represent
zones of crustal weakness, likely faults and fractures.
On the regional, 1,500,000 scale northeasterly linears, roughly parallel with the Skeena Arch,
dominate, along with a significant north-south linear corresponds with the Fraser River valley,
through Prince George and Quesnel and the strong east-west linear cuts through Prince George
and Vanderhoof, just to the south of Endako and just north of the Property. Of particular interest
is a swarm of north-south linears through the central portion of the study area.
The Xama property is located near the intersection of the important east-west linear, a strong
northeast trending linear and a weaker north-northeast linear. Patterns observed in the Bouger
gravity map suggest that many of the deposits may occur within specific, fault-bounded blocks
rather than along specific linears. At this scale of examination, it may be equally important for a
target to be proximal to a linear as to be directly on it.
At the Property scale (1:100,000), many of the linears are sub-parallel to, but not exactly
coincident with, mapped faults and contacts from the BCGS MapPlace geology map. In many
cases, they are probably reflecting the same features, but in others, they are clearly distinct.
According to Lowe et al, (2001), most of these, especially NE and NW structures, would be
post-mineral.
Not reflected in the mapped geology are the north-south linears that appear to be important and
potentially related to the known mineralization, as reflected mainly in the magnetics as lows,
possibly resulting from magnetite destruction due to hydrothermal fluids and, more regionally,
the gravity. The most important of these cuts directly through the Gel Zone.
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The target deposit type at Xama is a porphyry Mo (Cu) deposit (Endako) or, secondarily, a bulk
tonnage Au-Ag deposit (Blackwater). Both deposit types would be expected to be related to high
level intrusive activity and demonstrate structural control. The key exploration target suggested
by this study is defined by the known mineralization, the Owl and Gel Zones, the magnetic low
embayment in the area of these showings that could be a reflection of magnetite destruction by
mineralizing fluids and linears, likely structures, that are reflected in the magnetic data and may
control the emplacement of intrusions and related hydrothermal activity.
RECOMMENDATIONS
A Phase I, 2,000 m drill program, budgeted at $750,000, targeted utilizing the results of this
study in combination with existing geological mapping, surface geochemical sampling, IP
surveys and percussion drill results, is recommended to test the Owl and Gel zones at depth.
Holes should be drilled to minimum 250 to 300 m depth.
STATEMENT OF EXPENDITURES
Period: Aug 1-25, 2014
PROJECT: Xama Property – Endako Area, BC
Professional Wages
G. Carlson
Structural study
3.0 days @
$1,200.00 /day
$3,600.00
Report compilation
1.5 days @
$1,200.00 /day
$1,800.00
TOTAL
$5,400.00
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REFERENCES
Anderson, R.G., L'Heureux, R., Wetherup, S., and Letwin, J.M., 1997: Geology of the Hallet
Lake map area, central British Columbia. Current Research 1997-A; Geological Survey
of Canada.
Billingsley, P.R., and Locke, A., 1941, Structure of ore deposits in the continental framework:
Transactions of the American Institute of Mining Engineers, v. 144, p. 9–64.
Bright, Edward Gordon, 1967, Geology of the Topley Intrusives in the Endako area, British
Columbia: M.Sc. Thesis, University of British Columbia.
Brown, D.L. and Macrae, R., 1966, Geochemical survey of the Owl claim group. B.C.
Assessment Report No. 01002; for Anaconda American Brass Ltd.
Bysouth, G.D., 1996, Self-potential geophysical survey report on the Hen claim group. B.C.
Assessment Report No. 24798, for G.W. Kurz.
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Report, for G.W. Kurz.
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Report 29601, for G.W. Kurz.
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Report 32400, for G.W. Kurz and G.D. Bysouth.
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for G.W. Kurz and G.D. Bysouth.
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1997-2, pp 7-30.
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Ernst, Richard E. and Jowitt, Simon M., 2013, Large igneous provinces and metallogeny:
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Assessment Report No. 01689, for Anaconda American Brass Ltd.
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of America Bulletin, v. 99, p. 30–41.
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central British Columbia Intermontane Belt: magnetic and paleomagnetic evidence from
the Endako region. CJES, v. 38, p. 657-678.
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Document Outline - TABLE OF CONTENTS
- List Of Tables
- List Of Figures
- Summary
- Introduction
- Property Description and Location
- Accessibility, Climate, Physiography, Local Resources and Infrastructure
- Access
- Climate and Vegetation
- Topography and Vegetation
- Local Resources and Infrastructure
- Geological Setting and Mineralization
- Regional Geology
- Property Geology
- Mineralization
- Exploration History
- Structural Analysis
- Regional 1:1,500,000 Scale Analysis
- Regional and Tectonic Setting of the Xama Property
- Linears from Topography
- Linears from Magnetics
- Linears from Gravity
- Summary of Regional (1:1,500,000) Scale Linears
- Property 1:100,000 Scale Analysis
- Linears based on Topography
- Linears based on Magnetics
- Summary of Property (1:100,000) Scale Linears
- Targets from the Structural Study
- CONCLUSIONS
- RECOMMENDATIONS
- STATEMENT OF EXPENDITURES
- Statements of Qualifications
- References
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