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42A12SE0388 63.771 ROBB
and
010
Turnbull II comprises 15 claims located in tha aouthwaat part of
Robb Township and tho northwest part of Turnbull Townahip. Tha property la
about 3 miles west of the Kamiskotia Lake road and la aooaaaibla by a tractor
road for a diatanoe of 2 mile a and by trail for tha remaining diatanoe.
xhe claims wera staked to oovar tha waatarly extension of a fault
indicated on the Ontario Department of Mines nap of Godfrey Townahip (Mtp
No* 1954-4)* The environment le considered to be favourable for baae natal
deposits .
Rook exposure areas on the claims comprise about 15jt of tha total
acreage .
Volcanic flows of andesitio composition oooupy tha greater part of
tha outcrop areas. The flows strike westerly and tha tops of tha flows faoa
south. Tha massive character of the volcanics Is broken by jointa. and a
few narrow shear zones that strike westerly*
The volcanics are intruded by one northerly trending Mataohewan
diabase dike. Other, older diabasic and gabbroic bodies intrude the voloanioa
forming an irregular pattern of sills and dikes.
Two narrow granite dikes are exposed near the south boundary of
the property. \\
Coarse grained gabbro is exposed in tha weat part of tha property*
This formation is similar to the gabbro occurring in large masses to *he
northeast f in Robb Townahip.
Two narrow quartz veins were observed, They are sparsely to fkirly
wall mineralised with pyrite, sphalerite, chalcopyrite and a very little '
pyrrhotite.i [
Occurrences of disseminated pyrite, pyrrhotite and a very little
Page 2
are indicated on the aooonpanying map.
All of the ne tall l c occurrences are snail* 'hare i* no indication
that they Are likely to lead to larger deposits*
There indications that a wo R ter ly striking fault or shear tone
may oc~ur just north of the large outcrop area on Clains No. P-39080-81*.
-85 and -86. The indications are t an apparent displacement of the diabase
dike and the linear arrangement of magnetic anomalies* vest of the dike,
on claims No, P-39083, -92, and -93.
It is suggested that additional work on the claims should be
directed toward the identification and exploration of the postulated,
westerly trending fault or shear Bone.
Detailed ground magnetometer data should be obtained to provide
a clearer definition of the diabase dike north of the outcrop area, and
the anomalies occurring in linear arrangement west of the diabase dike*
Introduction
Turnbull II comprises 15 claims. Five of the olai&a, numbered
P-3"083,-90,-91,-92 and 93 i are located in Robb Township. Ten claims,
Numbered P-39079*-80,-81,-82,-8x,-85,-86,-87.-S8, and -89* art located
in Turnbull Township.
The property is located about 18 oilss, by road, northwest of the
town of Timins* It is accessible from the Ka&lakotia Late road by a
tractor road, for a distance of two miles, to a snail lake on the Robb*
Turnbull Township line and thence westerly by trail along the township lint
for a distance of one mile.
The olai&a were mapped during October and the early part of
November, 1955* A ground magnetoraetor survey was oarried out during November
and Deoenbor, 1955.
Mineral deposits on the claim* were investigated by the prospectors,
Page 3
in tl^lpast. Fresh exposures, on all occurrences, were obtained by blasting.
The claims were staked In an area that is considered to be
favourable for baso metal deposits,
The terrain ever the greater part of the property is nearly flat*
Cedar and spruce swamps occupy muoh of the area east of Robb Creek* Areas
rising a few feet above the ^warnp level support mixed stands of poplar,
birch t Jaokpine and spruce. Robb Greek le a clear water stream averaging
about 15 feet in width.
The outcrop area in claims numbered P-39080, -81, -85 and -86 riaea
to a maximum heif^it of about 150 feet* The northerly trending diabase dike
forae the crast of the hill.
The gabbro outcrops on claims numbered P-39089 and -93 rise only
about 20 feet above the surrounding area.
Geology
General
The oldest rook formation on the olaias la andesitlo lava.
Diagnostic features pertaining to the attitude of the flows are rare*
However, available evidence indicates that the flows trend westerly and
that the tops of the flows face south. Rook exposures to the northeast
of the property i for a distance of four miles, comprise nasal ve bodies of
gabbro and granite. Beyond the intrusive exposures the volcanic formations
recur , with the tops of the4 flows facing north. This indicates that the
large intrusive bodies invaded an anticlinal structure^ with the lavas on
Turnbull II occurring on the south limb*
Page
On* northerly trending Matachewan diabase dike is exposed on the
claims* Pre-Matachewan bodies of diabas* and porphyritic gabbro also intrude
the volcanics in the large outcrop area. They fora an irregular pattern of
sillB and dikes. The emplacement of these foraations was apparently controll
ed by joints.
Coarse grained, alt red gabbro occurs In the west part of the
property on claims numb-red P-39069 and -93*
There are a few small exposures of granite in the south part of the
property on claims numbered P-39080 and-81.
MatiOhevan
Diabase
Algoman
Granite
Haileyburian (?)
Diabase, Porphyritic gabbro, Gabbro
Keewatin
Andesite
Pag* 5
DsscrTption of Formations
Matachewan
Diabase - One diabase dike strikes H 15* W through the outcrop
area on claims numbered P-390?0, -81, -85 and -86, It averages 125 feet in
width, The offset to the wfl't near the south edge of the exposure is
apparently an original feature - there Is no evidence of faulting. The
diabase le coarse grained in the centre of the dike - the margins are finer
grained with chilled contacts. The dike has a massive appearance and weathers
brown,
Granite - Three small exposures of granite occur on claims numbered 39080
and -81. Contacts observed on two exposures indicate that the granite occurs
in narrow dikes. The texture is medium grained granular and fairly uniform,
Feldspar and quartz are the chief mineral constituents*
Hailevburiap (?)
Diabase - The volcanics are intruded by medium to fine grained irregularly
shaped bodies of diabase. The emplacement of these sill and dike-like bodies
appears to have been controlled by jointing in the volcanics. On the weath
ered surface, fine grained bodies are identified with difficulty* The prin
cipal mineral constituents are white feldspar and dark green pyroxene or
hornblende .
Porphyritic gabbro - This formation i* closely related to the diabase* Th*
occurre ea is similar. The variable composition and peculiar porphyritic
texture ie probably the result of differentiation, Th* distinguishing
feature is the development of white felspar phenoorysts that frequently occur
in clusters giving the rock a spotted appearance,
Page 6
Gabbro - There are several small exposures of gabbro in tha vaat part of tha
property on claims numbered P-39089 and -93. Tha formation la al tared, ooaraa
grained and raassive. The chief mineral conatituanta ara whit* feldspar and
dark green pyroxene, the faldapar content is variable and appeare to be of
secondary origin, frequently occurring in tenuous vein-like structures."* The characteristic features of this formation are similar to thoaa that
appear in the lar^e gabbroic masses to the north east*
Andesite - A series of volcanic flows occupy rao s t of the outcrop area
on claims numbered P- 30980, -81, -85 and -86* they ara fine grained, light
green in colour and fairly massive. In composition they ara cloaar to
rhyolite than basalt. Small quartz grains ara apparent in laoat apeolnena,
Flow structures are rarely seen. Pillows were observed at one location only
- on line 18W at 9+0)05. The pillow shapes indicate that the flow strikes
westerly and that the top of the flow faoea south. A few ropy, fragmental
flow tops confirm this observation. Tha dip of tha flows if naar vertical.
Structure
Joints within the flows ara the moat prominent structures. They strike
northerly and westerly. Dips are nearly vertical.
Weak, narrow shear zones wore observed in a few places. Tha shearing
strikes westerly. Dips are nearly vertical.
Mineralization
Two types of mineralization were observed In the andesite i
(1) Mineralization in association with quarts veins
(2) Disseminated mineralization in association with joints or weak shears.
A quartz vein, about 6" in width is exposed immediately wost of line I8tf
at 10+2JS. The vein strikes NftOoE and dips SO*N. A narrow depprassion, covered by vegatation lies along the strike of the vein to the west.
Pag* 7
The vein IB unevenly mineralized with pyrite, spalorite and chalcopyrite,
The best material la estimated to contain 10? sphalerite, and 3# chalcopyrite.
A similar type of vein is looated 50 feet vest of line 18W at
15+50S. It strikes north and dips 70o west. Minor amounts of pyrite*
sphalerite and chalcopyrite are associated with the quarts. Tht vela
pinohes out toward the vest*
Disseminated pyrrhotite and a very little chalcopyrite occur on
line 16W at 14+30S. The mineralisation appears to bs associated with joints.
The rook hue a rusty appearance over a snail area.
A small zone of disseminated pyrite is looated BO to 120 feat east
of line 28W at 1OOOS. The andeeite is moderately silicified. There it no
strong structural control. The mineralisation appears to be related to joints.
The andesite outcrop, looated vest of line 32W at 23+505, is weakly
oarbonatized and contains a little fine grained disseminated pyrite.
The Matachewan diabase dike le clearly defined by a northerly
trending magnetic anomaly on claims numbered P-39080 and -85, Other snail
magnetic anomalies over the volcanic outcrop are apparently due to a
variable distribution of magnetite in the older diabase and disseminated
pyrrhotite in the volcanics.
A magnetic anomaly occurs over the gabbro exposures in claim
numb *red P-39039 and -93. It is probable that other anomalies in the west
part of the property are related to other gabbroic bodies*
C.G. Macintosh
Pftgt 8
Attachents
Ontario Department of Minos Report^volurae 63, Part 7, 1954.
"Geology of Turnbull Township" by Nelson Hogg.
Ontario Department of Mines Report, volume 53* Port 4, 1944*
"Geology of Robb- Jamieson Area" by L* Q* Berry.
eoord -
Turnbull II, Base Map 42 A/123, Ontario* To accompany "Detailed
Geology - Turnbull II" by C. G* Macintosh* Feb. 14, 1956.
Map -
Dominion Qulf Company . Detailed Geology - Turnbull XI, Base Map 42A/128
Porcupine - Kirkland, Ontario, Scale l" a 200', Flsb, 14, 1956
D106BDOMINION aULF CpMPAI.T
Bock Specimen i*cord gbeet..
or Ityp. J^tytt-JI................ Bes* M*P jTo accompany niei&c^ progress report, geology report or fcap/*..5*xmro.o*0U)(ff.r.3^h^v.v./..../...,///.././/.;.//../:....^{stroke bui^ jpe^orts nbl jjmpllcable.; state oteaafciaS tib? |Uajr tftb, work *jt ^toa of' ' ' ''"" ' ' ' " ' ' - ' "
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42A12SE0288 63.771 ROBB
INTRODUCTION
OSO 1.
This survey was carried out on a block of 15 claims held by Dominion Gulf Company, and located in the southwest part of Robb Township and the northwest part of Turnbull Township.
Previous work on the property consisted of cutting and
chaining N-S picket lines spread 400 ft. apart and tied down with E-W tie lines. After this, C.G.Macintosh performed a detailed geological survey over the area in which he located two main
areas of outcrop. The one in claims P-39080 and P-39085 showed up andesitic lava flows intruded by a series of non-magnetic
diabase and porphyritic gabbro. A Matachewan diabase dike was also mapped through the area. To the west an outcrop of gabbro was found.
A series of susceptibility tests was performed on some of the rocks in the area, showing the andesite and the so-called Haileyburian diabase to be associated with generally low magnetics.
The bulk of the magnetometer survey was carried out from
November 29 to December 15, 1955 by D. Peters assisted by H. Leonard. A further programme of detail work was carried out by N. Stewart and P. Murtha between August 16 and August 27, 1956. An Askania Schmidt-type vertical magnetometer was used with a sensitivity of about 20 gammas per scale division.
A total of 107,400 feet of picket line were surveyed. The preliminary work was done on the lines at 400-ft. intervals with stations spaced 100 feet apart except in areas of rapid change where 50-ft. intervals were read. The follow-up detail work was
done on intermediate 200-ft. lines with readings spaced at 50-ft. intervals and at 25-ft. intervals where sharp changes were
encountered. This gives the total number of readings as 1539 over
20.4 miles of picket line.
The data were plotted in the field and then transmitted to the
Toronto office of Dominion Gulf Company where it was subsequently
replotted, contoured and interpreted. The data are presented on
the accompanying interpretation map on a scale of l" s 200 ft. with
a contour interval of 100 gammas.
SUMMARY AND RECOMMENDATIONS
The area has been subdivided into two main provinces. An
area of older extrusive and intrusive rocks is found in the southern
half of the area. In this area are several local anomalies, one
of which is considered to be the result of mineralization. To the
north there is a band of magnetic gabbro bounded on the north by
an area of granite (or non-magnetic gabbro).
Two diabase dikes are interpreted running north-south through
the area, one of these being a major feature. An east-west fault
has been interpreted through the area, mainly on the basis of an
E.M. survey. Several smaller faults have been interpreted on the
basis of breaks in magnetic lineaments and are considered to be
secondary faults associated with the major feature.
It is suggested here only that a gravity survey be performed
over certain specific areas of the property. More detailed
recommendations ere to be given in the interpretation of the
electromagnetic data. Over the zone marked M-l it is suggested
that some X-ray drilling be done in the vicinity of the mineralized
outcrop.
3.
INTERPRETATION
To aid In an interpretation of this area, the following table
of formations is included:-
Table of Formations
Matachewan
Algoman
Haileyburian
Keewatin
Diabase
Granite
DiabasePorphyritic gabbro Gabbro
Andesite
The claim group has been divided into two main,provinces.
The southern portion is one of generally low magnetics with little
relief shown. This is considered to represent the basic Keewatin
flows of andesite which occur in outcrop in claims P-39080 and
P-39085. In this exposure it is of considerable importance to
note that in intimate association with this andesite is a series of
intrusive rocks mapped as diabase and porphyritic gabbro, both of
probable Haileyburian age. In the report by C. G. Macintosh he
states about them, - "They form an irregular pattern of sills and
dikes. The emplacement of these formations was apparently controlled
by joints".
A random sampling of the rocks in this outcrop was tested on
the susceptibility meter. The values so recorded are as follows:
Central File Field ___No.__ No.
Rock Type Density Susceptibility Remarks
13801 210-CGM-591 Diabase 2.85 69 x 10" 6c.g.s.
13804 210-OGM-594 " 3.04 60 x "
13809 210-CGM-599 " 2.99 69 x "
13814 210-OGM-604 " 2.97 60 x M
4.
cont'd. Central File Field
No. No.
13805
13800
13802
13806
13807
13810
13811
13812
13815
13803
13808
13813
210-CGM-595
210-CGM-590
210-CGM-592
210-CGM-596
210-OGM-597
210-CGM-600
210-CGM-601
210-CGM-602
210-CGM-605
210-CGM-593
210-CGM-598
210-CGM-603
Rock Type Density
Diabase 3.04
Andesite
H
II
II
II
tt
H
II
Por.Gibro
H
M
2
2
2
2
2
2
2
2
3
2
3
.89
.91
.75
.85
.77
.86
.84
.90
.01
.97
.00
Susceptibility Remarks-6
2610 x 10 c. g. s. (Matachewan)
247
53
239
36
34
250
36
43
100
76
62
x "
x "
x w
x "
x M
x "
x "
x "
x "
x "
x "
From the table it becomes obvious that the magnetic effect
at surface of all these rock types, except for the Matachewan diabase
dike, should be very nearly the same. The andesite lava flow does
show some variations within the rock type itself. Tht interpretation
of this southern section then has been an area underlain predominantly
by andesite and randomly intruded Haileyburian diabase and
porphyritic gabbro.
In this area six small anomalies marked A-l to A-6 are
found. These appear to be oval-shaped although magnetic data are
not sufficient to outline their shape. However, they are very local
features, and they are believed to be the result of andesite 'chunks'
which have crystallized before the rest of the extrusive lava flow,
assumed a magnetization in the direction of that of the earth's
field, and then subsequently been moved and sometimes overturned by
5 .continued extrusive flow. It is quite feasible, however, that
these ere due to magnetic boulders in overburden. This is unlikely
as one of the anomalies, A-6, occurs directly over outcrop. An
alternative explanation of them lies in local concentrations of
magnetite. This again seems unlikely as concentration* of this
nature are not found in the outcrop.
In this same low magnetic section, an anomaly M-l has been
interpreted as the direct result of concentrations of pyrrhotite.
In the outcrop a few small quartz veins are found with which occurs
some chalcopyrite, pyrite, sphalerite and a little pyrrhotite.
An electromagnetic survey over the area shows up e week conductor
running over this series of small anomalies. A gravity survey to
be followed by possible X-ray drilling is recommended for the area.
This will be further discussed in the electromagnetic report for the
area.
North of this, with an east-west contact, is a region of
much higher magnetics, considered to be the result of a Heileyburian
gabbroic intrusion. On the west boundary of the property directly
in association with a magnetic high is a series of gabbro outcrops.
The aeromagnetic data show the existence of such a magnetic band,
becoming a very pronounced feature just to the west of the property.
Several faults are considered to cut the gabbro, - these are
discussed later.
On the north edge of the property and on the western half,
a band of low magnetics has been interpreted as granite. This band
is fairly extensive, as shown on the aeromagnetic survey. However,
it is inconclusive as to whether the band represents the non-magnetic
form of gabbro or is in reality the granite intrusive which has been
6.
Two north-south trending Matachewan diabase dike*, D-l and D-2, are interpreted in the area. D-2 is exposed for a considerable portion of its length in outcrop. The susceptibility of the rock specimen from this dike shows why it is such a sharp feature. Dike D-l on the other hand is not a pronounced feature, but a few indications seem to point to its existence. Perhaps the lack of data in critical areas leads to its being represented at only a few points. If it does exist, it might be stated that there is only a small width involved.
A major fault has been interpreted running east-west across the property. The first suspicion of its existence came from magnetic data in the north of Godfrey Township (south and west of here). The fault is expressed topographically by the northern limit of outcrop in the area. An electromagnetic survey showed up a major conducting zone in the east half of the property, marked on the accompanying interpretation map as a fault. Magnetically this zone is flat, but since the host rock is non magnetic andesite, this is to be expected.
Further to the west the fault intersects the gabbro- andesite contact. From this point, west, no major conductors were found, and the location of the fault becomes indefinite. It may either: (i) parallel the gabbro-andesite contact and then
strike more southerly where a weak conductor is found j (ii) continue on its strike but not be an open, wet feature
in the gabbro;
(iii) strike more northerly where another weak conductor
is found.
7.
tOf these possibilities, the second one is considered to be
the most likely. The evidence for this lies in the magnetic
lineaments within the gabbro horizon. It is considered that the
gabbro is far more resistant to shearing than is the andesite, and
so in the gabbro the fault is not conducting.
Two subsidiary faults have been interpreted, F-2 and F-3.
These appear to be features of the nature of tension faults,
and probably are of the same age as the major fault F-l.
In the north-east corner of the claim group a certain amount
of relief in the magnetics is probably associated with a
topographic roughness on the surface of the gabbro.
D. W. Strangway.
References:
Detailed Geology - Turnbull II,C.G.Macintosh, February 14, 1956,
Attachments:
Dominion Gulf Company - Interpretation Map of Ground Magnetics, scale l" ~ 200', January 11, 1956.
DWS/BL
• II B l m m m . .. - . - -- ̂
42A12SE8a88 63.771 ROBB 030
TAOl P t l l Illliiiiii""-"-•-•--i j ABLE ( 4 2A12SE8288 63.771 ROBB
Introduction
Summary fi. Recommendations
Interpretation
References
Attachments
1
2
4
10
10
030C
42AiaSE0288 63.771 ROBB 030
TAQTP t l IlIIIIHIiiM*'""----- TABLE J 4 2A ,2SEe288 63.771 ROBB
Introduction
Summary S. Recommendations
Interpretation
References
Attachments
1
2
4
10
10
030C
1.
INTRODUCTION
An electromagnetic survey was carried out in the period
from June 9 to June 23, 1956, by McPhar Geophysics Ltd., on a
group of fifteen contiguous claims held by Dominion Gulf Company
in Turnbull and Robb Townships and known as the Turnbull II claim
group. The claims are located as follows:-
(a) In Robb Township - P-39093, P-39083, P-39092,
P-39091, P-39090
(b) In Turnbull Tpw. - P-39079 to P-39082;-
P-39Q84 to P-39089.^
The equipment used by them was a vertical loop transmitting
coil, operating at frequencies of 1000 c.p.s. and 5000 c.p.s., with
e power output of about 450 watts. The transmitter, e 12-ft.
triangular coil, was oriented in the plane containing the receiving
coil, which wes carried along north-south picket lines. The survey
was performed on these north-south lines spaced 400 feet apart and
readings taken at 100-ft. intervals. In this way, 68,000 feet of
line (12.88 miles) were covered with 723 readings. A later
programme of detail work was carried out which involved covering
lines already covered but from different set-ups, with the hope of
obtaining better coupling with indicated conducting trends. In this
way, an additional 23,800 feet (4.51 miles) were covered with 259
stations. The total involved was 982 readings over 17.39 miles.
In all, ten set-ups were used on general coverage and three for
detail work.
2.
Data were first plotted in the field and then tent to Toronto
where redrafting and interpretation were done.
Previous work on the property included a detailed geological
mapping programme, followed by a magnetometer survey. The results of
both of these programmes have been discussed in previous reports.
It suffices here to say that the area is considered to be underlain
by andesite and later intruded rocks in the southern half and by
gabbro in the northern half. Two diabase dikes have been intruded
in the area, but they have no structural control indicated on them.
SUMMARY AND RECOMMENDATIONS
The electromagnetic survey of this property has shown up
several conducting trends, the most prominent of which is a wide*
open shear trending east-west and found in the east half of the
property. Where this shear or fault intersects the interpreted
gabbro-andesite contact, the feature disappears. It is believed, i
however, that the fault is continued on strike but is not an open
feature in the gabbro. On the west half of the property several
conducting trends have been interpreted, E-7, E-8 and E-9 t which
may represent a distribution of the energy which caused E-l, or may
represent a bedrock drainage pattern. Crossfaulting is interpreted
as the cause of conductors E-5 and E-6.
Conductor E-2 is apparently due to mineralization and is
associated with mineralization in outcrop and with a series of
magnetic anomalies.
3.
Recommendations for further work are made as follows:
(i) Gravity - L.12 -t- OOW - 12N - 263
In running this line, it is hoped that two possibilities will
be either eliminated or substantiated. The shear zone is
expected to yield a low, in the profile, but a local high
would be of considerable interest as this fault is believed
Algoman in age. A high is hoped for over conductor E-2; if
such were found, it is quite probable that sulphide
mineralization is the cause. It must be noted that the
gabbro-andesite contact will affect the results and that a
correction will have to be applied* (The contact is believed
to be vertical because of intrusion along planes of weakness
and the volcanics dipping vertically.)
(ii)Gravity Profile - L.40 * OOW - 12N - 26S
This profile is designed to test the major fault zone, as
well as to intersect conductors E-3 and E-4. These latter
are not believed to be of economic importance, but their
association with local magnetic anomalies makes them of interest.
Again the profile must be corrected for the gabbro-andesite
contact, and in fact, since the fault and .contact coincide
here, results may be ambiguous. It is not likely that a
correction will have to be applied for the granite-gabbro
contact as the densities are not greatly different.
(iii) Gravity Profile - L.68 * OOW - 12N - 13S
This profile is planned to intersect conductors E-7, E-8 and
E-9. It is held possible that any of these may have
mineralization in association with them, although it is more
4.
likely that they represent sheard or bedrock topography.
It is also probable that the location of the exact
extension of conductor E-l will be pin-pointed by this*
Again corrections will be necessary for the geological
contact.
(iv)X-ray Di&mond Drill Hole.
It is suggested that an X-ray diamond drill hole be
located to test the surface occurrences of sulphide
mineralization and see if there is any depth extent to
them. It is not believed that there is.
An approximate location would be L 16 * OOW at 14 * 75S.
The hole should be directed about 20OW of north, and
dip about 450 . The hole should reach at least a
250-ft. depth.
INTERPRETATION
The interpretation of the survey on this property must
be considered hand in hand with the magnetometer interpretation.
It must be remembered that gabbro which has been intruded into
the area, and which outcrops so extensively on the western edge
and to the west of the property, is considered to underlie the
northern portion of the property. Gabbro is a resistant rock
and does not permit of the shearing and fissuring that takes place
in the lava flows in this area, even though subjected to the
same stresses.
When considering the stresses which have played an
important part in the fracturing of this area, it is important
5.
to remember the complexity of event* which have taken place.
The initial lava flows were apparently folded and here we have
the south limb of en anticline dipping almost vertically and
striking east-west. As C. G, Macintosh states:-
"Beyond the intrusive exposures (to the north) the
volcanic formations recur, with the tops bf the flows facing
north. This indicates that the large intrusive bodies invaded
an anticlinal structure, with the lavas on Turnbull II occurring
on the south limb."
Subsequent to the initial Keewatin lava flows, folding
appears to have taken place and the main body of Haileyburian
gabbro was intruded into the centre of this major anticline.
A long quiescent period has been supposed to follow this from
the evidence found in the vicinity of tht Porcupine Creek Fault,
in which erosion levelled off the enormous folds* The Algoma
period which follows this was one of considerable activity in
which major granitic intrusives were formed and the ore deposits
of the Porcupine area are believed to have been laid down at
this time.
Later events are even more indefinite. A Matachewan age
of activity is known in which diabase dikes were formed. A
certain amount of faulting in the area has taken place subsequent
to this intrusion, although in general most of the faulting
occurred before this and flexures in the dikes are controlled by
intrusion at planes of weakness.
In the interpretation, we consider first conductors
E-l, E-7, E-8 and E-9. E-l is shown up from a variety of
set-ups and apparently represents a major fault. The electro-
magnetic response of this fault, or more appropriately fault zone,
is almost identical to the response of a major fault found in the
survey performed on the Feldman Option* (in jamieson Township,
east and slightly north of here). The dip angles involved are
fairly large especially in the case of the detail set-ups where
the transmitter was pieced directly on the conductor. However,
generally the dip angle plots do not show sharp features but
rather tend to indicate wide features of low conductivity.
The interpretation of conductor E-l then, is an
open fault zone which has become water saturated and hence is a
conductor. It is probable that the feature is variably conducting
both along strike and across its width. For this reason one wide
zone has been interpreted. The fault must have been pre-Matachewan
in age as the diabase dike D-2 appears not to have been affected
by any movement along it. There is topographic evidence for the
feature in a low occurring to the north of the outcrop in
claim P-39086.
The major problem afforded by the area is, - where
does the fault gp west of line 40 * OOW? No strong conductor is
found here that might represent a continuation of the fault zone.
However, according to the magnetics at this point the feature
apparently strikes into e zone underlain by gabbro, which from
experience in the Kamiskotia area, does not produce the open faults
which are found in the extrusive andesite in the area. The fault
evidently does not stop dead, and the following possibilities for
its extension are possible:-
(i) it is continued on the same strike but is offset
either to the north or the south by a subsequent fault;
7.
(ii) it is continued on the same strike but is not offset*
and not an open feature in the gabbro;
(iii) it is deflected and follows the gabbrp-endesite
contact ae a plane of weakness (and further to the west
may strike back into the andesite complex);
(iv) a combination of (ii) and (iii);
(v) the fault is e pre-gabbro feature.
Uf these possibilities (iv) is considered to be the most
probable interpretation. No evidence is given of a major fault
cutting off conductor L-l, although minor faults are interpreted
striking slightly east of north. Offsets on these features are
small.
If (v) were the interpretation, one would expect that E-l
would not be so pronounced a feature running in such d straight lint.
A major intrusion would surely be associated with more disruption
of fault trende than is here evidenced. It seems more likely that
this fault is of Algoman age.
E-7, E-8 and E-9 are believed to be possible extensions of
the fault. E-8 very closely follows the magnetically indicated
contact between the gabbro and andesite. This is a weak conductor
and as such m&y represent either a bedrock depression or a poorly
conducting fault. It is possible that the fault represented by
E-l is in part represented by this feature. E-7 is a conductor of
a similar nature and may represent a sheer in the andesite and
again be part of the distribution of the energy which caused E-l.
E-9 is a conducting trend in the gabbro horizon. The major portion
of the fault is considered to have continued on strike through the
8.
gabbro where magnetic lineaments show a series of breaks. E-9 very
closely parallels this feature, and as such may represent a part
of this.
An alternative consideration comes from realizing that
Robb Creek runs north-south through the property. It is reasonable
that these three conductors which appear to coalesce may represent
tributaries which at one time flowed into Robb Creek. It is notj
possible on the evidence available to delineate between these two
possibilities.
Conductors E-5 end E-6 are believed to represent cross faults
of the same age as the fault just discussed, and due to the same
compressional forces. Fairly strong conductors are indicated,
although the survey coverage could not detail conductors with this
general strike. The exact strike and limits of the conductor are
not well defined, although there is little doubt of their existence.
The main evidence used in interpretation was that of reverse cross
overs which are fairly numerous in the northwest section of the
property.
The cause of these conductors is somewhat vague. It is
believed that they represent open faulting in the gabbro. It is
thought that fsults in this direction may parallel a general
schistosity of the gabbro intrusive and so are more open than the
north-westerly trending features. Each of these conductors coincides
with magnetic lineaments in the gabbro.
Conductors E-3 and E-4 present rather a different problem.
It is believed that these may represent a lineament in the original
lava flow. Several of the 'chunks' of overturned andesite which
were interpreted from the magnetic data fall on strike of these
tfeatures. It is possible that the extrusive lava came in two or
three waves. The first flow crystallized and then activity was
renewed. The majority of the first flow remelted, but a few pieces
did not. These conductors may represent e contact between two
such flows. An alternative possibility is that shearing has caused
s conductor and at the same time a certain amount of localization
of magnetite.
The dip angles involved are not large but the profiles
represent sharp feetures, leading one to think of shallow lineaments
rather than wide indefinite features. Reverse crossovers were also
indicative of these features.
Conductor E-2 apparently represents a zone of mineralization.
It coincides with a zone of exposed mineralization, in which some
pyrrhotite occurs. A series of magnetic anomalies also coincides
with it. To all appearances, this conductor is caused by sulphides,
and a certain amount of drilling should be performed on it. A
gravity profile is recommended over it in hopes of supporting this
theory.
The major fault running east-west, if it is of Algoman age,
may be of considerable economic importance. Gravity profiles are
recommended in hope of delineating massive sulphides in this fault
end in association with other conductors found on this property.
DWS/BLOctober 30,1956.
D. W. Strangway
10.
References!
1. Dominion Gulf Company - Detailed Geology,
Turnbull II. C.G.Macintosh, February 14, 1956.
2. Dominion Gulf Company - Interpretation of Ground
Magnetic Data, Turnbull II, D.W.Strangway,
October 23, 1956.
Attachments:
1. Dominion Gulf Company - Electromagnetic Survey
Dip Angles; scale 1"-200'{ 1"*200 .
(a) frequency - 5000 c.p.8. (with interpretation)
(b) frequency - 1000 c.p.s.
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