Post on 18-Apr-2020
1182 Ste-Madeleine, C.P. 5043, St-André-Avellin (Québec) Canada J0V 1W0Téléphone / Fax : (819) 983-4828 E-mail : geophysics@tlb.sympatico.ca
Golden Share Mining Corp.LaRose Property
Thunder Bay District, N.W. OntarioN.T.S. 52B/10
Report on Total Field GroundMagnetometer Surveys
St-André-Avellin, Québec Gérard Lambert, P.Eng.December 6th, 2011 Consulting Geophysicist
Golden Share Mining Corp. LaRose Property, Mag surveys
TABLE OF CONTENTS
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Property description, location, access . . . . . . . . . . 2
Description of the geophysical surveys . . . . . . . . . 6
Results and interpretation . . . . . . . . . . . . . . . . . . . 8
Conclusion and recommendations . . . . . . . . . . . . 10
Appended: Scale
LaRose Grid, Total Field Magnetic contours map . . . . . . . . . . 1:5,000
La Rose Grid, Magnetic survey readings and profiles . . . . . . . . 1:5,000
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Introduction
In late November and early December 2011, ground geophysical investigations,
consisting namely in Total field Magnetometer surveys, were carried out over a grid of lines on
the LaRose Property in the Thunder Bay area, Ontario, for Golden Share Mining Corp.
The purpose of these surveys was to map the lithologies, geological units and structural
features underlying the property and to investigate favourable zones of alteration, these features
being potentially of economic interest if they are found to carry significant concentrations of base
or precious metals. Considering the paucity of good, modern, reliable ground geophysical data on
the property, the present surveys were thus meant to complement the geophysical understanding
about the property’s metallogenic and economic potential.
This report describes the work done, discusses the results obtained and the interpretation
of the data. Recommendations for any future work are presented in the conclusion.
The geophysical surveys were carried out between November 27th and December 5th,
2011, by crews of Services Exploration of Rouyn-Noranda, Québec.
Property description, location and access
The LaRose Property survey area is located west of the Shebandowan Lakes area in
northwestern Ontario. The survey area is situated at about 116 km (as the crow flies) to the west
of Thunder Bay and 16 km to the WSW of Lake Burchell, at about 14km off to the south of the
Trans-Canada highway (Hwy 11), near Lat 48/33'N and Long 90/51'W in NTS sheet 52B/10.
The survey area is accessible by vehicle, as the grid is transected by several secondary logging
roads and trails that lead into the claim block from Hwy 11. Please refer to the figures on pages
3, 4 and 5, showing various location maps of the property and survey area.
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The claims which were covered by the geophysical surveys are shown on the figure on the
next page.
Description of the geophysical surveys
The total field magnetometer surveys were carried out along lines spaced every 100
meters, from L-1000S to L-5000S, oriented northwest-southeast and turned-off from base line
0+00E. Tie lines 1500W, 500W and 500E were also laid out in order to control the lines’
deviation. Several G.P.S. control points (UTM Nad-83, zone 15) were read and established, in
order to keep track of the operator’s path along each line, to monitor the line deviations and to
assist in locating the grid lines in the UTM Nad-83 coordinate system. The final maps are
believed to represent as faithfully as possible the relationship existing between the position of the
grid lines and the property boundaries but no guarantee can be expressed about the absolute
accuracy of the various survey points and of some topographic features.
Magnetic surveys
The magnetic survey was conducted along all the survey lines, using GEM-Systems
model GSM-19 overhauser magnetometers, capable of reading the intensity of the earth's
magnetic field with a precision of 0.01 gamma.
Readings of the earth's magnetic field were taken every 12.5 meters along the lines. The
magnetic field measurements were corrected for diurnal drift by using the data from an automatic
base station, monitoring and recording the earth's magnetic field variations every 10 seconds.
The final results of the magnetic surveys are presented on the maps appended to this
report, at the scale 1:5,000. Posted readings (minus 56,700 gammas), profiles (base level of
56,700 gammas, profile scale 1cm=500 gammas) and colour contours (contour interval 25
gammas) of the total field magnetic data are presented on these plan maps.
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A total of approximately 72.7 line-km of magnetic data was gathered on the LaRose grid
during the course of these surveys by geophysical operator Sylvain Brousseau, under the
supervision of Pierre Gervais of Services Exploration, of Rouyn-Noranda, Qué.
Results and Interpretation
Crustal rocks having a substantial magnetic susceptibility include most types of mafic
(intrusive or extrusive) varieties. In increasing order of magnetic susceptibility, we have:
syenites, diorites, andesites, basalts, gabbros, diabases, pyroxenites/peridotites and Iron
Formations. Metamorphic rocks tend to exhibit a variable and often unpredictable magnetism,
depending on their original composition and their degree and type of metamorphism.
The principal controlling mineral of course is magnetite, a ferrimagnetic mineral. The
mineral pyrrhotite is also a common magnetic mineral but its very high electrical conductivity
makes it easy to distinguish from magnetite, which is seldom conductive.
Rocks of low magnetic susceptibility include most types of sediments (except iron
formations), most felsic plutonic rocks and major, hydrothermally-altered, tectonic structures.
A magnetic relief map is essentially an image showing the distribution of the magnetite
within the underlying lithologies. Inferences as to the rock types remain dependent upon the
chemical behavior of the magnetite when rock-forming processes took place, as well as the
quantity of oxygen available at that time.
As a rule, very strongly magnetic rocks are of ultramafic origins or are constituted of
oxide Iron Formations. Strongly to moderately magnetic rocks will usually consist of gabbros,
diabases, basalts. Weakly magnetic rocks would include granodiorites, diorites, granites,
rhyolites, dacites and andesites. Sedimentary formations such as shales, sandstones and
carbonates usually have no magnetic susceptibility to speak of.
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A more diagnostic aspect to identifying the types of rocks, apart from the absolute
magnetic amplitudes, is the shape of the magnetic anomalies: dykes, sills, flow sheets and
sedimentary horizons (BIF) will usually produce long, linear and narrow magnetic features.
Small and medium-sized intrusives will typically produce round or elliptic shapes of similar size.
Stocks and batholiths will usually exhibit magnetic signatures over very large areas with
common semi-circular magnetic zonations at their borders.
On the LaRose grid, the earth’s magnetic field has a background intensity of about 56,900
±50 gammas. The magnetic relief on this grid is somewhat active, with several small positive
magnetic peaks and a number of negative anomalies distributed in a poorly-organized pattern.
The anomalies rarely exceed 500 gammas in net amplitude and typically consist of one or two,
sometimes three, consecutive readings, producing signatures that generally have a short
wavelength. The overall grain or pattern of magnetic anomalies indicate the presence of weakly
to moderately magnetic units located very close to the surface, along a series of NE-SW trends.
They could likely be a family of small pyrrhotite bands occurring in sub-cropping patches. A
field visit is warranted over the stronger and more persistent magnetic spikes, as there is a very
good possibility that prospecting these areas will yield positive explanations for some of the
magnetic anomalies in these areas. Some suggestions would be: 1) along trend located between
L-4400S/1325W and L-3900S/1250W; 2) along trend located between L-3800S/325W and L-
2800S/225W; 3) along trend located between L-2900S/1460W and L-1300S/1300W.
An in-depth quantitative or geological interpretation is beyond the scope of this report but
there certainly is enough detailed information contained in the magnetic relief defined as a result
of this magnetometer survey to justify carrying out a refined analysis of this relief with the
assistance of a geological compilation map and hopefully translate this analysis in terms of
potential traps for metallic mineralization.
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Conclusion and recommendations
The Total Field ground magnetometer surveys which were recently completed over the
LaRose Property for Golden Share Mining Corp. have successfully defined a generally quiet
magnetic relief containing several small magnetic units that suggest the occurrence of many
narrow NE-SW-trending bands of pyrrhotite-enriched rocks. The depths to tops vary from zero to
a few meters at the most. It is quite probable that a thorough surface prospecting program on the
grid will allow for the explanation of some of the sharp or spikey magnetic anomalies. The more
quiet magnetic relief elsewhere on the grid may be an indicator that this area could be underlain
by rocks of felsic, intermediate or sedimentary composition.
With only a limited knowledge of the detailed geology of property area at this point, it is
difficult from a geophysical point of view alone, to rate the magnetic relief and magnetic
anomalies in terms of their economic potential, particularly if one is looking for gold, but it is
expected that some possibility of alteration and shearing may exist in the areas of subdued
magnetic activity and these should be checked in the field.
Recommending further work on this project, I think that it would be worthwhile to
assemble a compilation of past exploration work in this area, to see if the interpretation of the
magnetic signatures can be used to “calibrate” certain known mineralized zones and therefore
allow for some extrapolations. If pyrite-hosted precious metals are being considered as
exploration targets, then surveys applying the Induced Polarization technique should be
contemplated as a more direct method in defining and characterizing these targets.
Respectfully submitted,
St-André-Avellin, Québec Gérard Lambert, P.Eng.December 6th, 2011 Consulting Geophysicist
1182 Ste-Madeleine, PO Box 5043, St-André-Avellin (Québec) Canada J0V 1W0Téléphone / Fax : (819) 983-4828 E-mail : geophysics@tlb.sympatico.ca
STATEMENT OF QUALIFICATION
I, the undersigned Gerard Lambert, P.Eng, consulting geophysicist, declare the following:
1- I am an independent geophysical consultant, and have been practicing as such since 1987.
2- I have graduated from Laval University in Quebec City, Qué., Canada, in 1978, earning adegree in Geological Engineering (B.A.Sc.), specializing in Mining Geophysics.
3- I have been working in Mining Geophysics since 1973 and have been employed and havepracticed as a professional engineer continually since 1978.
4- I am a member in good standing of Quebec’s Order of Professional Engineers since 1978.
5- I have reviewed and interpreted the geophysical results (magnetometer surveys) on GoldenShare Mining Corp.’s LaRose property in northwestern Ontario using industry-standard practiceand have done so with the best of my knowledge and expertise.
6- I have no direct nor indirect interest and do not intend to acquire any such interest in GoldenShare Mining Corp. or any of its subsidiaries.
St-André-Avellin, Québec, Canada,December 6th, 2011
Gérard Lambert, P.Eng.Consulting Geophysicist