rubicon minerals corporation slate bay grid, red lake ontario · .. … · gold mineralization is...

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Rubicon Minerals Corporation Slate Bay Grid, Red Lake Ontario

Geophysical Interpretation

Quantec Geoscience Ltd. Karl Kwan, M.Sc.

With contributions from Kevin Killin

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Introduction and Overview

The exploration objective of the Titan-24 DCIP&MT survey at DMC Project is to map and detect potential gold mineralization related to structural contacts. Gold mineralization is most commonly found at or near the boundaries of ultramafic rocks of the Balmer Group. Gold mineralization is widely considered subject to structural instead of lithological controls in Red Lake camp.

The survey is designed to give information both perpendicular and parallel to the interpreted geologic strike in the area, and to get as much information as possible about the deep structural trends beneath the property.

The Titan-24 Distributed Acquisition System (DAS) employs a combination of multiplicity of sensors, 24-bit digital sampling, and advanced signal processing. It provides three independent datasets capable of measuring sub-surface resistivities (structure, alteration & lithology) and chargeability (mineralization) to depth. The DCIP component of the survey provides an excellent means of delineating target mineralization within the top 500 meters depending on the geologic and cultural environment. The DC resistivity is somewhat muted in this area due to lake bottom sediments, however, the MT resistivity provides additional resistivity information from surface to depths beyond one kilometer. The MT resistivity is useful for mapping geological contacts with resistivity contrasts and deep conductors that may potentially represent alteration or mineralization. The Chargeability data are of good quality and are considered to be valid to depths of approximately 500m.

The IP Chargeability, using DC resistivities is presented for this interpretation, while the Null Con Chargeability, using 1000 Ohrn-m uniform half space, is displayed as a reference backup.

A total of 5 lines, and 12 linear kilometers of data, were surveyed for Rubicon. The survey grid and line locations are summarized on the next page.

The interpretation is presented in section form. Each line is discussed individually. All targets should be reviewed with respect to other available information before drilling.

Digital data of all models, in Geosoft format will be included on a DVD, with a 3D digital work space as deliverables, along with the UBC DCIP2D and Geotools data.

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..

Slate Bay Grid location


Titan lines in Slate Bay Grid +

+

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Ouantec Geoscience

•

i.OPTION ONLY I [FOR SPARTAN

INCLUDE LINE NUMBER

LXX_

PWS

MT 2D inversion model codes

I # I u

Unrotated (X perp to profile)

Latorraca

z Zstrike Rot

Topo included

Geology

4

TM rho/phs TE rho I phs

3

TM rho/phs TE phs

2

TM rho/phs (noTE included)


..

MT 20 inversion flowchart

Different data sets

TM (rho/phs) & TE (phs) TM (rho/phs) & TE (rho/phs)

Starting models

RLM from 1,000 ohm-m HS 1,000 ohm-m HS

Inversion code

pw2diam (PW) rlm2dim (RLM)

Frequencies

10,000 -1.0 Hz (every 2nd in log10)

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.. .

IP 2D inversion scheme

• Using DC resistivity as the background resistivity; (interpretation)


•

Interpretation

First priority targets

• IP chargeability high at or near major geological boundaries/structures, with or without coincident resistivity low; IP can be a direct indictor of mineralization.

Secondary priority targets

• IP chargeability highs with or without resistivity lows, with no obvious geological structure associations;

• DC/MT or MT only resistivity lows at or near major geological structures;

• MT only resistivity lows at depth;

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Regional Magnetics

Regional magnetics in and around Slate Bay grid show major geological structures are trending SW-1\JE to the southeast, possibly corresponding to iron formations.


.. ..

Line llnterpretation

Ll is a near EW line. MT section shows mainly vertical to sub-vertical structures.

Ll-A is an extended, strong IP first priority target, with co-incident DC and MT resistivity lows and next to a major interpreted contact. This target is recommended for follow-up.

Ll-B and Ll-C are MT only resistivity low targets at 400m-500m depths.

Ll-D is a deep MT only target, which may represent a magmatic feeder system and as a result it could have VMS potential.

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. ..

MT PU_H3

Line 1 Slate Bay

Line 1 Stacked Sections

191 132 91 63 44 30 21 1. 10 -

l I

' ..,,' Chargeability Trend

-

I I I I I

Contact or fault

SmoothiP

- -Smooth DC

L1-A

Target

-

\00.0 ... 89. 7

8C.6

79 5 ru 69. 2

&.f. I 59.0

63 8

'" U 6 38.5

J:U 18.2 13.1

11.9

12.11

71

....

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.. ..

Line 2 Interpretation

Parallel to L 1, L2 traverses over a sharp magnetic gradient. MT section shows mainly vertical to sub-vertical structures, as well as a horizontal layer at 800m to 1 OOOm depth.

L2-A is an IP only target next to an interpreted contact and some 500m below ground.

L2-B, L2-C and L2-D are MT only targets at depths >600m.

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•

MT PU_HJ

Line 2 Slate Bay


575 398 275 191 132 91 63 44 30 21 14 10 --

,. ' ' .. ''

Chargeability Trend

I I I I I

Contact or fault

Smooth IP

Smooth DC

L1-A

Targe1

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• Line 3 Interpretation

Parallel to L l/L2, L3 covers a magnetically quiet. MT section shows mainly horizontal structures and a vertical feature to the eastern end.

L3-A is an IP only target having a weak MT resistivity low association.

L3-B is a strong IP chargeability target, and next to a major interpreted vertical fault or contact. It is a first priority target from structurally point of view and worthy further follow-up exploration. The strong IP responses may be partially attributed to the sharp resistivity contrast between the host rock and the shallow conductive overburden.

L3-C is an MT only resistivity low target.

L3-D is a deep MT only resistivity low target and may be corresponding to a deeper magnetic feeder system; therefore, it could have VMS potential.


•

MT PU_H3

"" ·-Line 3 Slate Bay


... 30 21 14

10 -·- - '""'

l I

' ~'' Chargeabllity Trend

I I I I I

Contact or fault

Smooth IP

Smooth DC

l1-A

Target

·-

100.0 .... .... 1!1.5 U .4

.... 51.0 , . ... "·' ll.l

"·' H.l H.t , .. 1.7

l! ""'::-'

Quantec Geoscience


L4 is a near NS line, traversing a rapidly decreasing magnetic gradient zone. MT section shows mainly vertical to sub-vertical structures.

L4-A is a deep, MT only target.

L4-B is an extended, strong and structurally favored, first priority, IP only target; it has co-incident MT resistivity low. It is quite similar to L3-B. Further exploration of this target is recommended.

L4-C is a deep, MT only target.

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MT PU_H3

Line 4 Slate Bay


91 63 44 30 11 14 10 -

,. I

' ,,' Chargeability Trend

I I I I I

Contact or fault

SmoothiP

.... ....

Smooth DC

L1-A

Target

100.0

9&.9

9V eu

'" "' "' 84.1

S9.0

su •v

'" "' J3.l

'" 23.1

"' 12.8 7.7

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Parallel to L4, LS is in relatively quiet magnetic zone. MT section shows mainly vertical to sub-vertical structures.

LS-A is an IP target with co-incident MT resistivity low.

LS-B is a resistivity low, both DC and MT, target.

LS-C is an IP only target next to an interpreted fault or contact.


•

MT PU_H3

Line 5 Slate Bay


132 91 63 44 30 21 14 10 --

,. I

' ~ ,•

Chargeability Trend

.... . ....

I I I I I

Contact or fault

Smooth IP

Smooth DC

L1-A

Target

100.0

IIU

au n_s 7U

'" "·' 59.0

49.7

n a 38.5

33.3

29.2

"' 11.11

"'

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Plan Maps at Various Depths

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. ' . Smooth DC Resistivity

200m lOOm

300m

1._, ·-,,_ ·~ '


. ' . Smooth DC Resistivity

SOOm

400m

1.- ·- -~' 1.- ·- ·-~ '

~ -·-

600m


• • •

100m

300m

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Smooth IP Chargeability using MT resistivity

200m

-- ·-'

j , __

100.0

94 .9 ll9.7 84.6 79.5 74.4

ll9.2 64 .1

59.0 !;3,8

4a.7 4).8

38.5 :13.3 211.2

23 .1 17.9

12.8

1.7 2.6 0 .0 c...,._Y

w"'


400m

600m

Smooth IP Chargeability using MT resistivity

, .- ~

SO Om

i .- ·- ·- ·-'

100.0 94.9

89.7

s.o.e 7Q .5

74.4

69.2 84 .1

59.0 53.8 48.7

43.6

38.5

33.3 28.2 23 .1

17.9 12.8

7,7

26 0.0

Char-ge-.y .,.,

·- . .,..,


It ,. •

MT Resistivity 1'-- . .- ·~,

lOOm 200m

I .... ·~ -·- ' 1.- ._

300m 400m

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,·-·- ·-·- 1

SO Om

i ,,..;;- ·-

·- ·-.1

800m

I - _ j_

I 1.- ·-

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MT Resistivity

100000 69183 47863 33113 22909 15849 10965 7586 52<18 3631 2512 1738 1202 832 575 398 275 19.1 132 91 63 44 30 21 14

600m

.Ul_

lOOOm

1'- ·-

'·- ·-

,.- ~ ~·- ,


.. .. . MT Resistivity

1200m 1400m

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Statement of Qualifications

I, Karl Kwan, declare that

I am a consultant with residence in Scarborough, Ontario and am presently employed with Quantec Geoscience Ltd., Toronto, Ontario.

I obtained a Bachelor's Degree (Honours) in Mathematics and Physics Co-op from University of Victoria in Victoria, B.C. in 1987, and a Masters Degree in Geophysics (M.Sc.) at University of Toronto in Toronto, Ontario in 1989.

I have practiced my profession continuously since May 1989 in Canada.

I have no interest, nor do I expect to receive any interest in the properties or securities of Rubicon Minerals Corporation, its subsidiaries or its joint-venture partners;

I was in charge of data acquisition quality control, I have reviewed the survey results and can attest that these accurately and faithfully reflect the data acquired on site; I undertook the 2D DC/IP/MT inversions, I oversaw the preparation and have reviewed this report, and the statements made in this report represent my professional opinion in consideration of the information available to me at the time of writing this report.

Toronto, Ontario

February, 2010

Karl Kwan, M.Sc.

Quantec Geoscience Ltd.

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rubicon minerals corporation slate bay grid, red lake ontario · .. … · gold mineralization is...

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