NORTHGATE EXPLORATION LIMITED 42E ' 3NE"3 ' 2 ' 9H9 CASTLEWOOD LAKE

SUITE 2701, P. O. BOX 143, 1 FIRST CANADIAN PLACE, TORONTO, CANADA MBX 1C7 - TELEPHONE (416) 362-6683 - TELEX 06-217766

010

GROUND MAGNETIC 6 ELECTROMAGNETIC

GEOPHYSICAL SURVEYS

OF THE

CASTLEWOOD LAKE CLAIM BLOCK

THUNDER BAY MINING DIVISION

NTS 42-E-13

RECEIVEDiir,.; 21986

MIWNG LANDS SECTION

Toronto, Ontario

May 1986

T. R. Atkins, B.Se.

G. Harper, Ph.D.

TABLE OF42E13N6W931 2.9149 CASTLEWOOD LAKE 010C

SECTION PACE NO.

1.0 INTRODUCTION 1

2.0 LOCATION AND ACCESS 2

3.0 PROPERTY 2

1.0 INFRASTRUCTURE AND ECONOMIC ACTIVITY 2

5.0 TOPOGRAPHY 5

6.0 PREVIOUS GEOLOGICAL WORK 6

7.0 REGIONAL GEOLOGY 7

8.0 GEOPHYSICAL SURVEYS 8

8.1 GENERAL 8

8.2 MAGNETIC SURVEY 8

8.3 MAGNETIC SURVEY INTERPRETATION 9

8.4 ELECTROMAGNETIC SURVEY 10

8.5 ELECTROMAGNETIC CONDUCTOR INTERPRETATION 11

9.0 CONCLUSION 13

10.0 RECOMMENDATIONS 13

II.O REFERENCES 14

12.0 CERTIFICATION OF CREDENTIALS 15

LIST OF TABLE, FIGURE, MAPS

TABLE l - CASTLEWOOD LAKE AREA CLAIMS

FIGURE l - LOCATION MAP

MAPS

MAGNETIC SURVEY MAP

ELECTROMAGNETIC SURVEY MAP

3

4

(In Back Pocket)

(In Back Pocket)

1.0 INTRODUCTION

Northgate Exploration Ltd. holds a block of 14 contiguous claims

northwest of Castlewood Lake, 30 kms north-northwest of Jellicoe,

Ontario. They were staked in April 1985 to cover an area of

anomalous rock geochemistry discovered by a regional survey in

1984. Initial field investigations of the claims were made in August

1985. A total of 19.336 km of picket lines and 2.963 kms of base

line were cut by Mid-Canada Exploration Ltd. covering all 14 claims

of the Castlewood Lake property. The baseline is oriented at 120 0

with perpendicular cross lines at 100 m intervals and picketed every

25 m. Subsequently the geological mapping and VLF-EM and

magnetometer geophysical surveys were performed by Northgate Project

Geologist Tom Atkins and field assistants Lyndon Majid and Terry

Sinclair respectively. The results of the geophysical surveys are

presented in this report. Reference is made to the companion report

which describes the results of the line cutting and geological mapping.

- 2 -

2.u LOCATION AND ACCESS

Castlewood Lake is located about 30 km north-northwest of the village

of Jellicoe on the east side of Lake Nipigon in north central Ontario.

The city of Thunder Bay lies about 225 kms southwest of Jellicoe via

Highway 11. The claims lie 0.2 to 4.0 kms northwest of Castlewood

Lake.

Access is via Highway 801 which branches north off Highway 11 about

9 km west of Jellicoe. At the termination of Highway 801 after 14.5

kms, the private Auden Road continues north past the Castlewood Lake

area to Auden on the CN transcontinental rail line. A short distance

south of the Onaman River the Castlewood Lake road branches south-

east off the Auden Road and runs through the claim block and event

ually southeast into Rickaby Township where it joins Camp 58 Road

which runs south to Highway 11, 3 km east of Jellicoe. Depending

on the route chosen, road distance from Jellicoe is 35-50 kms. (Fig. l)

3.0 PROPERTY

The Castlewood Lake claim group comprises 14 contiguous unpatented

claims, numbers TB820752 to TB820765, recorded on April 10, 1985

and held by Northgate Exploration Limited of Toronto. See Table l.

4.0 INFRASTRUCTURE AND ECONOMIC ACTIVITY

The village of Jellicoe on Highway 11 is the nearest community and

offers accommodation, general supplies, fuel, telephone and postal

services. Highway 11 is paralleled by a Canadian National Railway line,

major electric transmission lines and a natural gas pipeline. Additional

services are available in the mining town of Geraldton 55 km to the east

and the towns of Beardmore and Thunder Bay 24 km and 225 kms to the

west respectively. The Canadian National trans continental main railway

line is 35 km north of the property.

- 3 -

TABLE l

CASTLEWOOD LAKE AREA CLAIMS

Claim No. Recording Date

TB-820752

TB-820753

TB-820754

TB-820755

TB-820756

TB-820757

TB-820758

TB-820759

TB-820760

TB-820761

TB-820762

TB-820763

TB-820764

TB-820765

April 10, 1985

" 10, 1985

10, 1985

10, 1985

10, 1985

10, 1985

10, 1985

10, 1985

10, 1985

10, 1985

10, 1985

10, 1985

10, 1985

10, 1985

Total Claims: 1U

- 4 -

CLAIM LOCATIONul,.r, 0 n.A^

f fi J

PROJECT LOCATION

NORTHGATE EXPLORATION LIMITEDCASTLEWOOD LAKE PROJ. — No. 731

;c! -Oke Area, DisT of Nipigon, Thunder Bay Mng. Div,, Onr —N.TS.42E/13

LOCATION MAP

- 5 -

4.0 INFRASTRUCTURE AND ECONOMIC ACTIVITY - (Cont'd.)

The main activity in the area is timber cutting with Abitibi Power

and Paper Company in the immediate area and Domtar active to the

east. Although there are presently no active metal mines in the area,

the Ceraldton-Beardmore belt to the south has been a prolific gold

mining belt. Lesser gold and silver production is recorded from the

Tashota-Nipigon Mine 15 km to the northeast (1935-38), the Sturgeon

River Cold Mine to the south (1937-42) in adjoining Pifher and Elmhirst

Townships and the Orphan Mine (1934-35) to the southeast in Rickaby

Township. Recently Metalore Resources announced a gold discovery

in Irwin Township immediately south of Pifher Township .

The area has seen several surges of exploration activity with gold the

principle target up to the 1950's and base metals in the 1960's and

early 1970's. This latter period resulted in discovery of sub economic

Cu-Ni deposit 9 kms to the south and a sub economic Ag-Zn deposit

12 km to the northeast. This Ag-Zn deposit is described as being of

the stratiform type by Thurston (1976).

5.0 TOPOGRAPHY

The area is one of very low relief (less than 50 m) but in the

immediate vicinity of the claims Castlewood Lake is the only lake of

any consequence. Sand and gravel deposits cover much of the claims

and have been quarried for road fill at several locations. Extensive

swamp and muskeg areas extend north from near the north boundary

of the claim block.

Most of the area was logged over 10-20 years ago.

- 6 -

6.0 PREVIOUS GEOLOGICAL WORK

S.E. Amuken mapped the area at a scale of 1 inch to 1/2 mile for

the Ontario Geological Survey in 1976. His report and map, "Geology

of the Conglomerate Lake Area" OGS Report 197 (1980) provides an

excellent regional picture of the Archean stratigraphy of the area.

In 1972, following a regional airborne magnetic and electromagnetic

survey, Amax Exploration staked a block of seven claims over an

airborne anomaly. This claim block covered part of the area now

covered by the south part of the present claim block. Amax reported

evidence of an old grid and one drill hole indicating previous prospect

ing activity centered to the southwest. Amax undertook line cutting

geologic mapping, soil sampling and a variety of geophysical surveys

including VLF-EM, magnetometer, Radem VLF and JEM. One 77.8 m

diamond drill hole was completed to test a coincident magnetic and

EM anomaly. * It intersected 7 m from 36-43 m of 10-151 sulphides

in an intermediate tuff. Bands up to 5 cm thick contained up to

901 sulphides, primarily pyrrhotite and pyrite with minor traces of

chalcopyrite.

In 1984 Northgate Exploration Ltd. undertook an extensive rock geo

chemical survey of the area north from Beardmore and Jellicoe to

Auden and Kowkash. The present claim block was staked as a result of that survey.

7.0 REGIONAL GEOLOGY

Amuken 1980 shows the claim area to be underlain by an east to south

easterly belt of Archean rocks, predominantly mafic volcanics with

tuffaceous units. To the north and southwest are near circular diorite

bodies interpreted as the high level expressions of granite plutons.

Just west of the claim block where the diorite bodies have squeezed the

volcanics to their narrowest, their boundaries are only 1.6 kms apart.

*The collar of this hole was located 30 m north of the southwest corner

of claim TB820761

- 8 -

7.0 REGIONAL GEOLOGY - (Cont'd.)

A variety of later aplite, pegmatite, felsite, granitic and mafic dykes

cut the area. Most are narrow and the commonest trends are north

and northeast.

8.0 GEOPHYSICAL SURVEYS

8.1 GENERAL

During the period August 9-15, 1985 ground magnetometer and VLF-EM

surveys were completed on all the cut lines. The results of these

surveys are shown on the two attached plans in the back pocket of this

report. The magnetometer used was an EG&G Geometrics, Unimag II,

Model G846, portable proton precession magnetometer measuring the total

magnetic field intensity. The VLF-EM instrument used was a Geonics

EM 16 unit which measures the vertical components of secondary fields

radiating from conductive bodies in the ground, which fields are the

result of primary fields transmitted by a worldwide network of VLF

transmitting stations established for communication with submarines.

In this survey the EM 16 was equipped to receive the 24.0 KHz frequency

signal of Cutler, Maine. In all other respects the magnetometer and

EM 16 units were operated in accordance with their standard operating

procedures as described in their manuals.

8.2 MAGNETIC SURVEY

Within the property area a range in magnetic intensity of 2,380 gammas

is recorded ranging from a low of 58,358 to a high of 60,738 gammas.

Over most of the claims there is a rather monotonous background of

59,800 plus or minus 100 gammas. This is banded in an east-southeasterly

direction. The magnetic intensity is generally lower in the east-southeast

and west-northwest with a broad belt 600-800 m wide in the centre of

the property where the values rarely drop below 59,750 gammas. Punct

uating this uniform background are two systems of linear highs and several

very localized highs and lows.

- 9 -

8.0 GEOPHYSICAL SURVEYS

8.2 MAGNETIC SURVEY - (Cont'd.)

The linear high system labelled "C" comprises two sections and is

paralleled by a moderate VLF-EM conductor for almost all its length.

The two sections have a gap of about 100 m associated with a magnetic

depression which extends from the north side of the western section

of C to the south side of the eastern section of C.

The second linear high system comprises several segments labelled

E, F, G and H. These correspond in part with weak to moderate

VLF-EM conductors, the latter being less extensive than the magnetic linears.

Spot highs labelled J and N at the west end of the claims have

coincident weak VLF-EM conductors while the lesser spot high on Line

U W just north of the baseline and the two spot lows on Line 11 W,

north and south of the baseline do not have any corresponding VLF-EM

response.

8.3 MAGNETIC SURVEY INTERPRETATION

With minor disruptions the magnetic expression is of a generally east-

southeast striking layered sequence. Most of the area as indicated by

the geological survey is underlain by intermediate to mafic metavolcanics,

mostly flows or flow breccias with minor tuffaceous interbeds. This

sequence corresponds with the monotonous background magnetic pattern.

The linear magnetic highs, which are conformable to the general strike

of the layered rocks, indicate the presence of narrow almost vertically

dipping units, probably tuffs or cherts with a higher magnetic content

which in places is likely to be sulphides where the VLF-EM confirms

conductors.

Anomaly C appears to be disrupted by a southeast trending low

feature. This feature is likely a dyke or small intrusive body which

has intruded along a fault which caused the slight offset of the two

sections of C and the swing in strike of C approaching it.

- 10 -

8.0 GEOPHYSICAL SURVEYS

8.3 MAGNETIC SURVEY INTERPRETATION - (Cont'd.)

Anomaly E, F, C, H, is probably the result of similar lithology

as C but is offset by two faults, without associated dyking. Folding

or drag rotation of this magnetic unit is also indicated approaching

the fault and there is also an apparent bifurcation of the unit west

wards. Both anomalies C and E, F, C, H can be traced further

than marked on the plan but with much lower relative magnetic

intensity suggesting a significant change in their mineralogy.

North of anomaly E on Lines 00, 1 W and 2 W and possibly on Line 3 E

are indications of another similar linear high but of a lower, more

diffuse character. Overburden depth in this area is likely to be

considerably thicker than over E, which in turn is deeper than C.

Point high J is likely a continuation of the unit from C while point

high N may represent part of the same highly variable horizon as

extends through the point high on Line 4 W, O +2S m N.

The geological mapping shows an intrusive diorite body extending

northward from the north edge of the claims. The diorite is character

ized by a monotonous low magnetic expression similar to the lows.

There is a suggestion that the contact does not trend east-west but

east-southeasterly with several northeasterly offsets either due to

faulting or favourable fracture systems during intrusion.

Interpreted fault zones O and P define a widening wedge southwards

which corresponds to the area of slightly higher background.

8.4 ELECTROMAGNETIC SURVEY

The EM 16 survey revealed one strong conductor A, one moderate

conductor B and several weak conductors C to L. All the conductors

with the exception of E, F, l and L trend east-southeast paralleling

the general geological strike trend. It should be noted that this strike

trend is well oriented with respect to the Cutler, Maine transmitter location.

- 11 -

8.0 GEOPHYSICAL SURVEYS

8.U ELECTROMAGNETIC SURVEY - (Cont'd.)

Conductor A trends ESE for 500 m and is open-ended to the ESE at

the property boundary while at its WNW end it appears to be

terminated at a possible cross conductor L. It is indicative of a near

vertical to steeply south dipping zone probably of sulphides or

graphite with considerable depth. Overburden is shallow.

Conductor B also trends ESE and is open-ended to the WNW at the

property boundary. It has a total length of 800 m. Although displaying

a strong in-phase profile it is not supported by the quadrature, unlike

Anomaly A. This conductor probably is the result of a near vertical

fault or shear zone.

Weak conductors C, D, E, F and C are all indicative of conductive rock

units but probably with low sulphide or graphite contents. Weak

conductors H, l. J, K and L are interpreted as probably shear or fault

zones. Overburden depth over E and the north end of L is substantial.

8.5 ELECTROMAGNETIC CONDUCTOR INTERPRETATION

Conductor A has a strong likelihood of a massive sulphide source.

The lack of magnetic correlation indicates an absence of magnetite or

pyrrhotite. The zone conforms to the regional stratigraphy and is on

strike from a zone of pyrite and pyrrhotite drilled by Amax in 1972

(see accompanying geological report) which gave a high magnetic response

and an EM anomaly.

Conductor B does not have any magnetic support and follows the axis

of a long narrow swamp either side of which is a greater abundance of

outcrops than anywhere else on the property. It trends ESE parallel

to the geologic strike and is likely indicative of an incompetent sheared

tuffaceous unit, possibly with some graphite or sulphides present.

- 12 -

b. J GEOPHYSICAL SURVEYS

8.5 ELECTROMAGNETIC CONDUCTOR INTERPRETATION - (Cont.d)

Conductor C corresponds with a very pronounced linear magnetic

high over its whole length. It is likely a sheet-like zone of weakly

conductive character but some magnetic affinity such as disseminated

pyrrhotite in a tuffaceous unit. Conductor D is similar to C and is

probably the continuation of it beyond a fault disruption (magnetic

fault expression O). The strength of the magnetic anomaly with D

is much less than for C.

Weak conductors E, F and G all correlate with a linear magnetic high

system but are much less extensive than it suggesting that the unit

only locally contains sufficient sulphides to induce a conductive effect.

Weak conductors H, l and J, which do not have magnetic correlations,

may represent intermittent similar sources as E, F and G but are more

characteristic of shear zones in which respect it should be noted they

follow a pair of trends ESE and E sympathetic to and paralleling the

diorite intrusive contact. All are short (of the order of 100-200 m)

and H could be as validly interpreted trending E as ESE, in which case it would suggest an en echelon series of shears.

Conductor K only has a strike extent of 150-200 m and may be largely

the result of conductive overburden although some weakly conductive

bedrock shear component is suspected as well. It has no magnetic

expression.

Conductor L is a very weak expression of a structure, probably a

fault, for which there is some magnetic confirmation in the form of offsets.

- 13 -

9.0 CONCLUSIONS

The magnetic survey has confirmed the geological interpretation that

the Castlewood Lake property is underlain by an ESE striking sequence

of volcanics, mostly of fairly uniform intermediate to mafic composition

and flow or flow breccia form.. This sequence has intercalated several

extensive but narrow horizons probably of more felsic tuffs with a

significantly higher magnetic expression which locally at least appears

to be in the form of sulphides which respond to the EM survey. These

incompetent tuffaceous horizons may have formed the locus for shearing

as several, particularly in the northwest adjacent to the contact with

a large diorite body to the north, yield weak EM responses.

A strong EM conductor A without a supporting magnetic high trends

conformably ESE in the southeasternmost two claims of the property.*

This is on strike from a known sulphide zone and has every indication

of being caused by a fairly massive sulphide body.

10.0 RECOMMENDATIONS

Electromagnetic conductor A warrants drill testing to determine the

source which is considered likely to be a massive sulphide accummulation.

The conductors C, E, F and C, which are associated with linear magnetic

highs, also warrant further investigation as they likely represent

disseminated sulphides in tuffaceous units. They are disrupted by cross

faulting and in the case of C by a possible dyke or intrusion, all of

which is conducive to favourable environments for precious metals con

centrations.

Conductor B indicates a long zone of shearing which could also be

favourable for precious metals accummulations. The overburden depth

in the vicinity of Anomaly E is indicated to be substantial but not else

where so it is worth undertaking a soil geochemical survey to attempt

further discrimination of the anomalies prior to expensive drill testing.

Conductor A should be traced to the ESE to determine its full extent

and additional claims acquired if necessary.

* Claim numbers are shown on the Geology Plan in the accompanying report.

M.O REFERENCES

Amukun, S.E.1980 : Geology of the Conglomerate Lake Area,

District of Thunder Bay; Ontario Geological

Survey, Report 197, 100 p.

Atkins, T. and Harper, G.

1986 : Line Cutting and Geological Survey of the

Castlewood Lake Claim Block, Thunder Bay

Mining Division, Ontario, NTS 42-E-13;

Northgate Exploration Ltd., unpublished

assessment report.

Thurston, P.C.

1976 : Geology of the North Onaman Area, District

of Thunder Bay; Ontario Division of Mines,

OFR 5197, 118 p.

- 15 -

12'" CERTIFICATION OF CREDENTIALS

l Thomas Atkins certify that:

1) l graduated from McMaster University in 1983 obtaining a

B.Se. degree in Geology.

2) J was employed for two summers prior to my graduation as a

Geological Assistant; working in Ontario and Alberta.

3) l completed an independent study for a B.Se. Thesis.

4) l have been employed by Northgate Exploration Limited as an

Exploration Geologist since graduating ; working in Ontario

and British Columbia.

Thomas Atkins, B.Se.

- 16 -

CERTIFICATION OF CREDENTIALS

l, Gerald Harper, of 26 Orchard Crescent, Toronto, Ontario, declare that:

a) Since 1980 l have been employed as Chief Geologist for Northgate

Exploration Limited of Suite 2701, l First Canadian Place, Toronto,

Ontario.

b) l am a registered member, in good standing, of the Association of

Professional Engineers of the Province of Ontario.

c) l am a 1965, B.Se. Honours graduate of the University of Rhodesia,

having majored in Geology and Chemistry.

d) l was awarded the Ph.D. degree of the University of London,

England, in 1970, for research in the field of geology.

e) l have practiced exploration geology for a period in excess of 20

years, the last 15 being in various Provinces of Canada including,

and in particular, Ontario, Newfoundland and British Columbia.

f) The work undertaken in this report was under my supervision and

l have direct personal knowledge of the performance and abilities

of the author.

Gerald Harper Chief Geologist

4aei3NEoa3i 2.9149 CASTLEWOOD LAKE

Mining Lands Section

Control Sheet

300

File No ^? J/ 5^ 7

TYPE OF SURVEY

MINING LANDS COMMENTS:

GEOPHYSICAL

GEOLOGICAL

GEOCHEMICAL

EXPENDITURE

Signature of Assessor

)ate

Ministry ofNaturalResources

Ontario —

Report of Work(Geophysical, Geological, Geochemical and Expenditures)

- ^---nstruotions: — or print.If ntJTflber of mining claims traversed exceeds space on this form, attach a list.

Note: — Only days credits calculated in the "Expenditures" section may be entered in the "Expend. Days Cr." columns.

\^^Jif M J JffJflT^i/ l lie aiming ri*.l - 1AJ C

Type of Survey(s)

Claim Holder's)

NORTHGATE EXPLORATION LIMITEDW.s BOX 143, 1 FIRST CANADIAN PLACE, TORONTO, ONTARIO

Survey Company Date of S

NORTHGATE EXPLORATION LTD. PJy 1 K

vi.. — uo not ust snaaea areas oeiow.Township or Area

CASTLEWOOD LAKE AREA G'%^Prospector's Licence No.

T835

M5X 1C7

urvey (from St to)

Uo D j l ~JL U i Uo i oJjTOT YT. 1 Day 1 Aflo. 1 ir.

Total Miles of line Cut

22.3 kmName and Address of Author (of Geo-Technical report)

TOM ATKINS c/o NORTHGATE EXPLORATION LTD., - AS ABOVECredits Requested per Each Claim in Columns at rightSpecial Provisions

For first survey:

Enter 40 days. (This includes line cutting)

For each additional survey: using the same grid:

Enter 20 days (for each)

Wan Days

Complete reverse side and enter total (s) here

Geophysical

- Electromagnetic

- Magnetometer

- Radiometric

- Other

Geological

Geochemical

Days perClaim

2020

Geophysicalj Days per ! Claim

- Electromagnetic l

- Magnetometer t

- Radiometric

- Other

Geological

Geochemical

Airborne Credits j

Note: Special provisions l Electromagnetic credits do not apply to Airborne Surveys, j Magnetometer

Radiometric

j Days per i Claim

Expenditures (excludes power stripping)Type of Work Performed

Performed on Claim(s)

Calculation of Expenditure Days Credits

Total ExpendituresTotal

Days Credits

InstructionsTotal Days Credits may be apportioned at the claim holder's choice. Enter number of days credits per claim selected in columns at right.

i m seJe

Apri l 2'86Recorded Hold^6p"rtgwirtJStgTVat

Certification Verifying Report of Wry*

Mining Claims Traversed (List in numerical sequence)

For Office Use OnlyTotal Days Cr.jDate Recorded Recorded

. i

Mining ClaimPrefix

TB

- - -

i ^

-. '.-'i-

~ -.

,i v . i C

1,

\Jf

Number

820752

820753

820754

820755

820756

820757

820758

820759

820760

820761

820762

820763

820764

820765

Expend. Days Cr.

Mining ClaimPrefix

REr t f.*

NlfflW

Number

r - ' - - ~ ~*L u i j i- ~

5.7 M .. r "ia LANlJi) bub l

Expend. Days Cr.

tew—

Total number of mining claims covered by this i ^1 report of work. ^~

irder

l hereby certify that l have a personal and intimate knowledge of the facts set foh m the Report of Work annexed or witnessed same during and/or after its completion and the annexed report isfrue.

ing performed the work

Name and Poital Addreis of Person CertifyingFYDI ORATION t IMITED

May 27, 1986 Report of Work 175

Northgate Exploration UnitedP.O. Box 143l First Canadian PlaceToronto, OntarioM5X 1C7

Dear Sirs:

RE: Mining Claims TB 820752, et al. 1n the Area of Castlewood Lake

We have not received the reports and maps (1n duplicate) for Geophysical (Magnetometer ft Electromagnetic) Surveys on the above-mentioned claims.

As the assessment "Report of Work" was recorded by the Mining Recorder on April 7, 1986 the 60 day period allowed by Section 77 of the Mining Act for the submission of the technical reports and maps to this office will expire on June 6. 1986.

If the material 1s not submitted to this office by June 6, 1986 we will have no alternative but to Instruct the Mining Recorder to delete the work credits from the claim record sheets.

For further Information, please contact Mr. Arthur Barr at (416)965-4888.

Yours sincerely,

J.C. Smith, Supervisor Mining Lands Section

Whitney Block, 6th Floor Queen's Park Toronto, Ontario M7A 1W3

Telephone: (416) 965-4888

AB/roccc: Mining Recorder

Thunder Bay, Ontario175

Ontario

Ministry of Natural Resources

GEOPHYSICAL - GEOLOGICAL - GEOCHEMICAL TECHNICAL DATA STATEMENT

FUe.

TO BE ATTACHED AS AN APPENDIX TO TECHNICAL REPORTFACTS SHOWN HERE NEED NOT BE REPEATED IN REPORT

TECHNICAL REPORT MUST CONTAIN INTERPRETATION, CONCLUSIONS ETC.

Type of Survey(s) GEOPHYSICAL-MAGNETIC AND ELECTROMAGNETIC

Township or A™ CASTLEWOOD LAKE AREA-THUNDER BAY

Claim HnlrfPT(.) NORTHGATE EXPLORATION LIMITED

P.O. Box 143, l First Canadian Place Tor.

Survey nn.np.ny NORTHGATE EXPLORATION LIMITED

Author of Report T. ATKINS AND G. HARPER———————-

Address of Ai.thnr c/o NORTHGATE EXPLORATION LTD.

Covering Dates of——— 01-08-85 - 20-08-85(linecutting to office)

Total Miles of Line r..t 22.3 km (for geological survey)

SPECIAL PROVISIONS CREDITS REQUESTED

ENTER 40 days (includes line cutting) for first survey.ENTER 20 days for each additional survey using same grid.

Geophysical—Electromagnetic.—Magnetometer———Radiometric———Other——————

DAYS per claim

2020

Geological.Geochemical.

AIRBORNE CREDITS (Special provision credits do not apply to airborne surveys)

Magnetometer.

DATE:

-Electromagnetic.(enter days per claim)

SIGNATURE:

. Radiomatric

of Report or Agent

Res. Geol.. . QualificationsPrevious Surveys

File No. Type Date Claim Holder

MINING CLAIMS TRAVERSED List numerically

T.B. 820752(prefix)

820753(number)

820754

820755

820756

820757

820758

820759

820760

820761

820762

820763.

820764

820765

RECEIVEDJ UN '.'"to8b

TOTAL CLAIMS.

837 (5/79)

SELF POTENTIAL

Instrument_____________________________________________ Range.

Survey Method _____________________________________________

Corrections made.

RADIOMETRIC

Instrument ——^

Values measured

Energy windows (levels)^—^—————————^^^————^^^^—.—-.^-^^^^^—-———

Height of instrument_______________________________Background Count.

Size of detector^^—.^—-^^——.^-—-^^^--——.^—^—————.-^^^————.^^^^^-——

Overburden -——-———^^.^^^-————^——.^^-^.—^^——^^^———.——^^^^.————(type, depth — include outcrop map)

OTHERS (SEISMIC, DRILL WELL LOGGING ETC.)

Type of survey.^^-^-—-—^-^——^^———^^—.—

Instrument ̂ —-^—^——.^^^—^^—.^—^———.——

Accuracy—^—-^————^———.^—^——^-————-^—.

Parameters measured.

Additional information (for understanding results).

AIRBORNE SURVEYS

Type of survey(s) ____

Instrument(s) ——————(specify for each type of survey)

Accuracy————-^^—^-———^..—.(specify for each type of survey)

Aircraft used^—^—^^^^^^^——^—.-^^—-^^^———^——.^-^

Sensor altitude.

Navigation and flight path recovery method.

Aircraft altitude _______________________________Line Sparing

Miles flown over total area__________________________Over claims only.

GEOCHEMICAL SURVEY - PROCEDURE RECORD

Numbers of claims from which samples taken.

Total Number of Samples. Type of Sample.

(Nature of Material) Average Sample Weight————————

Method of Collection—————————

Soil Horizon Sampled.

Horizon Development-

Sample Depth—————

Terrain—————————

Drainage Development—————————————

Estimated Range of Overburden Thickness.

ANALYTICAL METHODS Values expressed in: per cent C~ln n

per cent p. p. m. p. p. b.

Cu, Pb,

Others_

Zn, Ni, Co, Ag, Mo, As,-(circle)

Field Analysis (.

E-xtraction Method.

Analytical Method-

Reagents Used———

Field Laboratory Analysis

No. ____________

SAMPLE PREPARATION(Includes drying, screening, crushing, ashing)

Mesh size of fraction used for analysis____

Extraction Method-

Analytical Method .

Reagents Used ——

Commercial Laboratory (.

Name of Laboratory_

Extraction Method——

Analytical Method ——

Reagents Used —^—^—

.tests)

.tests)

-tests)

GeneraL General.

GEOPHYSICAL TECHNICAL DATA

GROUND SURVEYS — If more than one survey, specify data for each type of survey

802 Number of Stations___________________________Number of Readings 802

H WZO

Station interval 25 metres____________________Line spacing IQQ metres

Profile scale____l cm = IO&————^————-——.^——^—^-^—-——-—————————

Contour interval 50 gammas———^-.^——-———————^.^———^^—-^^—-^-^—

Instrument UNIMAC. II PQRTARI E PROTON MAr.NFTOMFTFR MODE! C,

Accuracy — Scale constant 10 ggmmas——^——————^—————.———-^-.——^—.

Diurnal correction method Rago|ino Tje-ln———^-^———-^———————^-^——

Base Station check-in interval (hours)———————^——^————————^——^—-^^—N/ A Base Station location and value '_________________________________

u

o

O

W

Coil configuration VERTICAL AND HORIZONTAL COILSf-4

Coil separation ————-—^^—-^——^^————-——————^—————

Instrument CEONICS EM 16

Accuracy _____~________________________________________________________ Method: C*i Fixed transmitter CD Shoot back CD In line CD Parallel line

24.0 kHz Cutler, Maine U.S.A.-^-———^——^-—————-———^————(specify V.L.F. station)

Parameters measured Tilt Angle of Polarized Ellipse———————^——-^——^——^——^

Instrument

Scale constant.

Corrections made.

Base station value and location .

Elevation accuracy.

Instrument .————.—--———.^-^——^—-^^^—————^——^—^——^^——^—^—-^—-^

Z Method CD Time Domain CD Frequency Domaino ———H Parameters — On time ____________________________ Frequency —————N2

— Delay time

— Off time ____________________________ Range .

Power.

O o*Q WuD Electrode array _Q5 Electrode spacing .

Type of electrode

— Integration time.

2 9149 CASTLEWOOD LAKE 210

magner.c contour depression

't f interpreted from Mag

s of linear magnetic high

SCALE

IOO MET

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NORTHGATE EXPLORATION LIMITEDCASTLEWOOD LAKE PROJ. — No. 731

Cosflewood L^Ke A-ec, District o* Nistgor, ^nunder Say Mng Civ , Cnfano

MAGNETOMETERCONTOUR MAP

T Ath ns Aug '85 l N T S —— 42 E/ 13 | lcm - 25m

z. Or*iz May 96 l

-f/y?

/r-E. M. CONDUCTOR f .

^^mm^Mea^n- QUADRATURE "7 ^"v. Ill- PHASE

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NORTHGATE EXPLORATION LIMITEDCASTLEWOOD LAKE PROJ. — No. 731

Castlewood Lane Area, DisTic- of Nioigon, Thunder Bay Mng Div , Ontario

VLF-EMPROF 1 LE

Station CUTLER, MAINE Fr*qu*ncy ' 24- KHz

'Ac'- z ~-'-T A'kins Aug '85

0'3*" C, "

Rodel E 0"iz May 86

-) j sNTS —— 4 2 E 7 1 3 lcm z 25m

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TOPOGRAPHY

LAKES. RIVtRS ETC.. FROM FCaEST RESOURCES INVENTOR i' S^CFT So ^:-aS.

ME9ID.AN LINE SURVEYED BY PHILLIPS AN3 BENNER,

O L. S S , 1916. FIELO NOTE BOOK No. 2474.

IHI IN. (.HMATION THAI Al'l'l AHS ON JHI;; MAI HAS R f T N C O M P11 M i f MOM VAHOUS SCniHO'. AMI' ACUJMACY IS Not r.UAMANlFf-f) l H ( .', l WISHINl, 1O SIAKL MIN IN(i C.I AIW5 SIKHII D CON •-III.l WU H fHf MININC. f(! f;OH()[ l! MINISTMY ( )l NOH l H f (IN DI VM Of 1 Ml N! AtJliMINCS F OH AD [JlTlONAt INfOMMAllON ON THf STATUS O( IHf l ANOr, SMOVVN Mf" HI ON

DISPOSmON Of CROWN LANU

TYPE Of DOCUMENTPATENT.SURFACE 8. MINING RIGHTS.

.SURFACE RIGHTS ONLY, ..." .MINING RIGHTS ONLY ___.

LEASE. SURFACE ft MINING RIGHTS -." .SURFACE RIGHTS ONLY.. . ." . MINING RIGK rS ONLY-.. ..

LICENCcOF OCCUPA ION ,___ ,.. ORDER-IN-COUNCIL -. ...____ RESERVATION ___. M ._______ .. CANCELED __ ______ _. SAND St GRAVEL . __ .^ " . _. .1

SYMBOL

e e

aT

___- d)NOTE: MINING KIG* Tt IN P V^CEL. f ATiNT w

19.J. VMTtU IN OW.GIHAL *-AT(MTrt BY JM UBLIC LAND* ACT. W**, t. TO. CHAP 3-0. S*C. ' *. SUSSc- t.

LEGEND-

P\VFO ROAD

GRAVFL i'C^O

CThTR RCADS

TRAIL O^ ' ; .iT

AD c. KIGHT or W*Y! RAP'

ILANDU.SI

. -' - T '-. D

v;' 1 c i-, 'i; r '-v'^

SCALE: 1 INCH * 40 CHAINS

FEET 4000 eooo 8OOO

AREA CASTLEWOOD LAKE

M. N. R. ADMINISTRATIVE DISTRICT

NIPIG 8

soenv

DIVISIOI THUNDER BAY

CAND TITLES/ REGISTRY DIVISION

' 'THUNDER BAY

Ci*i! * JUIY, I960MNflt'o*f

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