a geophysical survey in the roclcs of the paleozoic eagle
TRANSCRIPT
REPORT ON GEOPHYSICAL GROUND SURVEYS
ON THE REG 2 AND 3 MINERAL CLAIMS
MAGNETIC A N D ELECTROMAGNETIC PULSE SURVEYS
BY
HEIKKI LIMION
L o c a t i o n :
C l a i m s owned by :
Work d o n e by:
Work d o n e b e t w e e n :
Kamloops M i n i n g D i v i s i o n B r i t i s h Co lumbia NTS: 8 2 MI 2E
Newmont E x p l o r a t i o n o f C a n a d a L i m i t e d
Newmont E x p l o r a t i o n o f C a n a d a L i m i t e d
May 29 - September 20 , 1985
A geophysical survey in the roclcs of the Paleozoic
Eagle Bay formation revealed magnetic highs and two discrete
electromagnetic pulse (EMP) conductors. Both are recommended for
diamond drilling, to determine the cause for the anomalous
conductivity.
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TABLE OF CONTENTS
Summary Introduction Location, Access, Topography Geology and Previous Work EMP Instrumentation Geophysical Coverage Results and Interpretation Conclusions and Recommendations References Statement of Qualifications Cost Statement
Figures 1. Claim Index Map - 2. Location Map 3/4. EMP Field Survey Set-Up 5. Loop 5 - X Component at 4.37 ms - 6. Loop 6 - Resultant at 4.37 ms
( 7. Decay plot at .1100~/50S 8. Loop 7 - Resultant at 4.37 ms 9. Decay plot at 2500~/125S
Maps at 1 : 2500 1 . Clearwater Project REG Claims
~agnetic-contour Map, including Claim Location
2. Clearwater Project REG Claims Geophysical Interpretation
Appendix I
EMP Profiles and Plans Loops 5,6 and 7
(ii) (iii)
in pocket
Under separate cover
I n t r o d u c t i o n
The REG c l a i m s are east o f Vavenby, B.C., i n t h e
Kamloops Mining D i v i s i o n . They l i e i n t h e Shuswap Highland i n
t h e s o u t h e r n p a r t o f t h e C a r i b o o Moun ta ins , and are mapped t o be
a t t h e n o r t h w e s t e r n end o f t h e P a l e o z o i c E a g l e Bay Forma t ion .
The r o c k s a r e p o t e n t i a l h o s t s f o r v o l c a n o g e n i c mass ive
s u l p h i d e s o r e x h a l i t e h o s t e d m a s s i v e s u l p h i d e s which may c o n t a i n
g o l d .
The g e o p h y s i c a l s u r v e y w a s s e t up t o h e l p i n mapping o f
t h e claims, and t o l o o k f o r c o n d u c t i n g m a s s i v e s u l p h i d e d e p o s i t s .
- A g r i d w a s e s t a b l i s h e d o v e r t h e claims. The l i n e s have been r ead i w i t h a magnetometer . Three l o o p s were s e t up and r e a d w i t h t h e
( Newmont EMP ( E l e c t r o m a g n e t i c P u l s e ) sys t em.
L o c a t i o n , Access, Topography - F i g u r e s 1 a n d 2
The c l a i m s s t a r t 4km E o f t h e town o f Vavenby, s o u t h
o f t h e N . Thompson R i v e r . A r oad f rom Vavenby t o Adams Lake
p a s s e s t h r o u g h t h e c l a i m s . The c l a i m s t o t a l 118 u n i t s i n 6
m o d i f i e d g r i d claims, and t h e y are r e c o r d e d i n t h e Kamloops
Mining D i v i s i o n . The c l a i m s a r e 1 0 0 s owned by Rewmont
E x p l o r a t i o n o f Canada L imi t ed and are d e s c r i b e d as f o l l o w s :
CLAIM U N I T S RECORD NO. RECORD DATE
R E G 1 20 REG 2 20 REG 3 20 REG 4 20 REG 5 20 REG 8 1 8
May 29, 1984 May 29 , 1984 May 29, 1984 May 29 , 1984 May 29, 1984 Aug 9 , 1 9 8 4
Claims 2 and 3 were g r i d d e d f o r g e o p h y s i c s , f o r t h e y
a r e t h e more r e a d i l y a c c e s s i b l e , and t h e most l e v e l .
The topography is mounta inous , a l t h o u g h t h e g r i d is on
a p l a t e a u . E l e v a t i o n s range from 4000' t o 4300' on t h e g r i d .
The c l a i m s a r e wooded, and q u i t e t h i c k w i t h undergrowth i n s p o t s .
Geology and Previous Work
The g e o l o a h a s been d e s c r i b e d i n a r e p o r t by Nebocat
(1985). Most of t h e p r o p e r t y is covered by overburden.
The REG 1-8 c l a i m s a r e u n d e r l a i n by t h e Upper P a l e o z o i c
Eagle Bay Formation - a h i g h l y c o n t o r t e d and metamorphosed
assemblage of f e l s i c t o i n t e r m e d i a t e v o l c a n i c s , l i m e s t o n e , s h a l e , - and minor cong lomera te . The Eagle Bay r o c k s g r a d e i n t o t h e
Shuswap Metamorphic Complex t o t h e e a s t and a r e i n t r u d e d by t h e
Cre taceous Baldy and R a f t B a t h o l i t h s n e a r t h e n o r t h - c e n t r a l
p o r t i o n of t h e i r o c c u r r e n c e .
The G.S.C. Map (O.F.637) shows a sequence of c h l o r i t i c
s c h i s t and g r e e n s t o n e ; s e r i c i t i c p h y l l i t e , s c h i s t , and q u a r t z i t e ;
l i m e s t o n e ; and a r g i l l i t e u n d e r l y i n g t h e Reg c l a i m s . A c o n t o r t e d
a n t i f o r m a l s t r u c t u r e , shown t o u n d e r l i e p o r t i o n s of t h e Reg 1-3 c l a i m s , s u g g e s t s t h a t m u l t i p h a s e f o l d i n g h a s t a k e n p l a c e . Our
mapping a l o n g t h e p r o j e c t e d s o u t h e r n l imb o f t h i s s t r u c t u r e
r e v e a l e d a v a r i e t y o f d i p s r a n g i n g from SW t o SE which may
s u p p o r t t h i s i n t e r p r e t a t i o n .
The geology mapped by Newmont correlates well with the
G.S.C.'s classification and stratigraphy, except for some slight
variations in lithological description. The paucity of outcrops
throughout much of the area hampers accurate correlation between
units and in sorting out the stratigraphy. A tentative sequence
in the western part of the property is as follows: siliceous
metasediments overlain by andesite and chlorite schist; grey-
black argillite and phyllite; interbedded chlorite schists and
carbonate; andesite; massive limestone; and chlorite schist and
andesite. Whether or not some of these repetitions are due to
folding, thrusting, or interfingering is not clear.
The Chi claim, owned by CIMA Resources Limited, is
enveloped by the REG 1 claim. The Chi claim is staked on a
stratabound zone of disseminated copper mineralization discovered
- by Nicanex Mines Ltd., in 1969. After drilling three short holes on the showing in 1970, they allowed the claims to lapse; Barrier
Reef Resources acquired the ground as the Pipe and Exhalite
claims in July, 1977. Cima Resources staked the ground in
August, 1 983.
The Upper Paleozoic Eagle Bay Formation hosts major
stratabound Cu and Pb-Zn deposits, such as the Harper Creek and
Mt. McLennan deposits, respectively, as well as numerous small
deposits. The Rexspar uranium deposit, located 4km south of
Birch Island, occurs in a brecciated trachyte believed to be a
contemporaneous volcanic vent. The recent discovery of the Rea
gold deposit, west of Adams Lake, shows that the Eagle Bay
Formation has good potential for hosting precious metal, as well
as base metal, stratabound deposits.
-4-
The REG c l a i m s were s t a k e d i n May-Aug 1984, and l i m i t e d
g e o l o g i c a l and geochemica l s u r v e y s were comple ted t h a t y e a r
(Nebocat ( 1 9 8 5 ) ) . The g e o p h y s i c a l s u r v e y s t a r t e d i n August of
1985-
EMP I n s t r u m e n t a t i o n - F i g u r e s 3 and 4 A c a r t o o n ( F i g u r e 3 ) d e p i c t s t h e f i e l d l a y o u t .
The t r a n s m i t t e r l o o p i s u s u a l l y 400m x 800m, a l t h o u g h
i t s d imens ions w i l l v a r y depending on topography and t a r g e t . I t
is t h i c k , u n i n s u l a t e d aluminum w i r e . The t r a n s m i t t e r is powered
by a small g e n e r a t o r . A t y p i c a l t r a n s m i t t e r c u r r e n t waveform is
shown i n F i g u r e 4. C u r r e n t s h u t - o f f t a k e s p l a c e o v e r a q u a r t e r
s i n e wave shape i n 0 . 3 t o 0 .4 msec., and a common p e r i o d is 112
s e c . The t r a n s m i t t e r and r e c e i v e r a r e s y n c h r o n i z e d by r a d i o .
- The ground s u r v e y r e c e i v i n g c o i l is a i r c o r e d , measur ing 4 ' x 3 ' . The d r i l l h o l e c o i l is a narrow f e r r i t e c o r e d
u n i t . The r e c e i v e r i t s e l f w i l l measure 28 samples of t h e decay
c u r v e ove r f i f t e e n p e r i o d s . S e v e r a l r e p l i c a t i o n s a r e made. The
c h a n n e l s measured w i l l t y p i c a l l y cove r a range from 0 .5 msec t o
160 msec a f t e r t u r n - o f f . Data a r e r e c o r d e d i n i n t e r n a l s o l i d
s t a t e memory.
I n t h e f i e l d , t h r e e modes o f o p e r a t i o n a r e i n u s e . I n
t h e r e c o n n a i s s a n c e mode, v e r t i c a l component r e a d i n g s ove r w i d e l y
spaced g r i d p o i n t s w i l l g i v e a g e n e r a l i d e a of back-ground and
h e l p t o l o c a t e a n o m a l i e s . D e t a i l e d s u r v e y s which r e c o r d one
v e r t i c a l and two h o r i z o n t a l components map anomalous a r e a s .
Dr i l l h o l e s u r v e y s measur ing t h e a l o n g h o l e component a r e t h e
t h i r d f i e l d method. On t h e REG c l a i m s , t h e d e t a i l e d mode is
u s e d .
TRAVERSE LINES
MOVING RECEIVER
LOOP 0 c!
EMP FIELD PROCEDURE FIGURE 3
N E W M O N T T l M E DOMAIN
EMP S Y S T E M
CURRENT
TRANSMITTED
VOLTAGE
MICRO- 1 I lL MEASURED V O L T S -
0 20 40 6 0 8 0 IOC M
kuu..." . ' ' ' , SEC
2 8 CHANNELS
EMP MEASUREMENT PRINCIPLE FIGURE 4
-6-
The operator is critical to the success of field
surveys. He monitors the magnetic field decay and decides
whether data is acceptable. He will do the preliminary editing.
He can observe the anomalous decay, and can monitor the migration
of smoke rings (~abighian (1979)).
Field data will consist of about 15,000 numbers daily.
These numbers are recorded in instrument memory and are
transcribed onto a computer tape in the evening. Editing of data
is followed by the production of plots in the office, showing
sectional profiles, contour maps, vector plans or profiles, decay
plots, and combinations of the above.
Once the computer data has been viewed, it is possible
to remove regional effects and to automatically fit rectangular
or circular current distributions to explain field results.
- (Barnett (1984)).
Geophysical Coverage
Magnetic coverage was with the EDA OMNI IV total field recording magnetometer. There were 2402 field readings along the
30km of grid lines at 12-1/2m intervals. Data were corrected for
diurnal variations, using a tie line with repeated checks and the
OMNI IV tie line correcting procedure. The data are plotted on
the two Magnetic Contour Map.
Three EMP loops were laid out, and the 30km of grid
line are read at approximately 600 sites. Three components of
the decay of the induced magnetic field are measured. The
locations of the three loops are on the Geophysical
Interpretation map. Data from the first 16 channels of the
decay, contour plans of selected channels and components, and the
shape of the decay curve for selected readings are plotted in
- Appendix I.
Results and Interpretation - Geophysical Interpretation Maps Two d i s c r e t e , c o n d u c t i n g , anomal i e s a r e o u t l i n e d on EMP
Loops 6 and 7. Both a r e i n t e r p r e t e d t o be from f a i r l y deep
s o u r c e s . The magne t i c s u r v e y does n o t show any c l e a r magne t i c
t r e n d s , b u t t h e r e is some magnet ic a c t i v i t y i n t h e v i c i n i t y of
t h e EMP r e s p o n s e s .
Magnetic Survey - Magnetic Contour Map No d e f i n i t e g e o l o g i c a l t r e n d s a r e found on t h e magnet ic
su rvey . A g e n e r a l mag low t r e n d s n o r t h e a s t t h r o u g h 0 0 / 9 0 0 ~ . It
is c u t by a n o r t h wes t t r e n d i n g mag f e a t u r e which goes t h r o u g h
0 0 / 1 0 5 0 ~ . A g e n e r a l n o r t h - e a s t e r l y t r e n d o f mag h i g h s is e v i d e n t
on t h e wes t end of t h e g r i d .
Loop 5 EMP Figure 5
- A l a r g e anomalous i n d i c a t i o n on t h e nor th-wes t c o r n e r
of t h e l o o p is e v i d e n t . T h i s anomaly is e v e n t u a l l y r e s o l v e d from
l o o p 6 d a t a , and is d i s c u s s e d t h e r e . A s m a l l e r anomalous
i n d i c a t i o n is s e e n on t h e nor th-wes t c o r n e r o f t h e s u r v e y a r e a .
I t is t e n t a t i v e l y p l a c e d a t 3 0 8 ~ / 8 1 7 ~ , b u t canno t b e d e f i n i t e l y
l o c a t e d because t h e i n f l u e n c e of t h e o t h e r c o n d u c t o r is t o o
s t r o n g .
An EMP l o o p ove r t h a t c o n d u c t o r w i l l be r e q u i r e d t o
d e f i n e i t .
Loop 6 EMP - Figures 6 and 7 Loop 6 shows two c o n d u c t o r s . One, n e a r t h e n o r t h -
e a s t e r n edge of t h e l o o p is t h e same one t h a t w a s e v i d e n t f rom
l o o p 5. A second , n e a r t h e n o r t h e r n edge o f t h e s u r v e y a r e a is ,
a g a i n , n o t d e f i n a b l e ; and needs a l o o p t o t h e n o r t h .
The anomaly n e a r t h e l o o p edge is c e n t e r e d n e a r t h e
b a s e l i n e i n e a r l y t i m e (4 .37 msec ) , and m i g r a t e s n o r t h w i t h t i m e
(8 .27 msec) . I t a l s o shows a n e a r v e r t i c a l d i p (85') i n e a r l y
t i m e and f l a t t e n s o u t t o 34' w e s t e r l y w i t h l a t e r t i m e . A l l o f
t h i s i n d i c a t e s a c o n d u c t i v e body t h a t is n o t f l a t i n one
d imens ion , b u t r a t h e r h a s no w e l l d e f i n e d s t r i k e and d i p . A t
l a t e r t i m e , t h e eddy c u r r e n t s w i l l t e n d t o l o c a t e on t h e p l a n e
w i t h t h e most c o n d u c t i n g m a t e r i a l .
The decay h a s a t i m e c o n s t a n t o f 3.6 msec ( ~ i g u r e 7), when model led w i t h a n e x p o n e n t i a l c u r v e . T h i s g i v e s a
c o n d u c t i v i t y wid th of 357 mhos t o t h e body.
The ' b e s t ' model f o r t h e c o n d u c t i v e body a t 8 .27 msec
i s drawn on t h e Geophys ica l I n t e r p r e t a t i o n map. A d r i l l h o l e at
- 1 1 0 0 ~ / 0 0 d r i l l i n g 360' a t -55' s h o u l d i n t e r s e c t t h e c o n d u c t o r ; - bo th t h e conduc to r a t e a r l y t i m e and a t l a t e t i m e .
Loop 7 EMP - Figures 8 & 9 On l o o p 7 , we a g a i n s e e a n i ll d e f i n e d c o n d u c t i n g
h o r i z o n on t h e n o r t h end of t h e s u r v e y a r e a , and a b e t t e r d e f i n e d
conduc to r n e a r t h e w e s t e r n edge ( ~ i g u r e 8 ) .
The main conduc to r n e a r t h e w e s t e r n edge moves w i t h
t i m e , i n d i c a t i n g t h a t i t is n o t a p l a n a r f e a t u r e . A t l a t e r t i m e ,
t h e b e s t f i t t i n g conduc to r model d i p s a t 41' t o t h e s o u t h e a s t .
The conduc to r is shown t o b e f a i r l y deep (153m). It h a s a t ime
c o n s t a n t of 3 . 9 msec, and an i n t e r p r e t e d c o n d u c t i v i t y - w i d t h o f
770 mhos.
Because o f t h e small s i z e o f t h e model t a r g e t , t h e
- recommended d r i l l h o l e i s a t 1803/251 g ~ , and d r i l l i n g v e r t i c a l l y
f o r 180m.
Conclusions and Recommendations
The northern part of the grid area, from 2000W to 800W
remains as an area of ill-defined EMP responses. Any
encouragement found in the drill holes means that the area should
be explored with further EMP.
Two good conductors are interpreted to lie at 100m-150m
depth. These are both prime drill targets. Magnetic survey data
show magnetic anomalies in the region of those conductors, but
there is no definite correlation established between magnetic and
EMP anomalies.
- 1 0 -
EMP PLRN-VIEW PLOTS
TX LOOP NO. . 5
CHANNEL : 4 .37 MS
COMPONENT . L I V E R T . DOWN1 63
VERT. U N I T S . PICROVOLTS
HORZ . SCALE : 1 CM = 100 METERS 1
L
r
NEWMONT EXPLR. OF CRNRDR
AREA : CLEARWATER
PROJECT : REG
OPERATOR . PMO/OGL./LM
DATE . 4UGUST 1985
SURVEY TYPE : SURFACE EMP
CONTOUR INTERVAL
100 M I C R O V O L - T S
475N
275N
L
75N
125s
3255
5255
7255
9'25s
N E W M O N T E K P L R . OF C A N A D A
EMP SURVEY
AREA : CLEARHATER
PROJECT : QEG
OPERATOR : PMD/DGL
DATE : 9UGUST 1 9 8 5
SURVEY TYPE : SURFACE EI iP
TX LOOP NO. . G
RX COIL NO. : 1 0 5
STAT I ON : 1100H /5CS a
X-COMPONENT 335'
T-COHPONENT 65'
Z -COMPONENT DOHN
V) I- J 0 > '-3
3 w
IZ
0 2 4 6 8 A 0 12 1 4
MILLISECONDS
NEWMONT EXPLR. OF CANRDR
EMP SURVEY -
RRER : CLEQRHRTER
PROJECT : 9EG
OPERATOR : PMD/DGL
DATE : SEPTERBER 1 9 8 5
SURVEf TYPE : 5URFACE ERP
TX LOOP NO. : 7
RX COIL NO. : 105
STAT I ON : LSGOH/1255
M I L.L I SECONDS
References
Nabighian, M. N., 1979: Quasi-static transient response of a
conducting half-space: -an approximate representation.
Geophysics, vo1.44, no. 10, pp 1700-1 705.
Turner, J.A., and Nebocat, J., 1985: Geological and Geochemical
Report on the REG 1-9 Claims. Newmont Exploration of
Canada Limited, Vancouver, British Columbia.
Barnett, C.T., 1984: Simple inversion of time-domain
electromagnetic data. Geophysics, vo1.49, no.7, pp925-
933.
STATEMENT OF QUALIFICATIONS
I, Heikki timion, received my B.A.Sc degree in Engineering Science (Geophysics option) from the University of Toronto in 1965.
I spent two summers in qeophysical field work; one with Hudson's Bay Oil and Gas, and one with INCO Exploration.
In 1965-66 I worked for one year with Hudson's Bay Oil and Gas as a Junior Geophysicist in seismic field work.
From 1967-1976 I worked with INCO Exploration, on ground and airborne geophysical surveys. I was in charge of airborne geophysical operations for four years and worked on research and development of airborne qeophysical systems. I conducted qround geophysical surveys in Canada, U.S.A., and
II Brazil. i
In 1977 and 1978 I was head of the qeophysics sections in the Kenya Department of Mines and Geology. During this time, I was under contract to CJDA (the Canadian International Development Agency) .
Since the beginning of 1979, J have held the position of Chief Geophysicist of Newmont Exploration of Canada Limited.
I am a member of the Society of Exploration Geophysicists, the Association of Professional Engineers of Ontario, the Prospectors and Developers Association, and the Canadian Exploration Geophysical Society.
In my absence, the surveys were carried cut by party chief, David I,eask, who qraduated from University of Toronto in 1984 with a R.Sc. in Geolocry, and who has five season's prior experience as a geophysical technician.
STATEMENT OF COSTS
A. PERSONNEL 1985
P r o j e c t G e o l o g i s t s
1. May 29 J i m T u r n e r ( L i n e c u t t i n g ) J u n e 5-8, 10-16 J u l y 12, 13, 15
1 5 d a y s @ $128.13 $1,921.95
2. May 29 J o h n Nebocat ( L i n e c u t t i n g ) J u n e 5-8, 10, 11, 1 8
8 d a y s @ $129.17 $1,033.36
G e o p h y s i c i s t s
1. May 1 3 H. L i m i o n J u l y 3 1 Aug. 5, 1 9 S e p t . 2 4 O c t . 16, 22 Mov. 5, 6, 8.
1 0 d a y s @ $201.25
2 . J u l y 1 7 G . Boyd
1 d a y @ $201.25
3. Aug 14-31 D. L e a s k S e p t . 1-5
23 days @ $115.00
F i e l d A s s i s t a n t s
1. May 2 9 H . K l a t t ( L i n e c u t t i - n g ) J u n e 6-16 J u l y 1 5
1 3 d a y s @ $80 .00 $1,040.00
2. May 29 I a n C a s i d y ( L i n e c u t t i n g ) J u n e 7, 8, 10, 11
5 d a y s @ $101.00 $ 505.00
3 . May 29 G. R o s t e ( L i n e c u t t i n g ) J u n e 5 -8 , 10-16
1 2 d a y s @ $ 8 2 . 5 0
4 . May 29 K. McNei l ( L i n e c u t t i n g ) J u n e 6 , 8 , 1 0 - 1 2 , 14 -16 Aug. 21 -25 , 27-31 S e p t . 1, 2 , 4
2 3 d a y s @ $ 1 0 0 . 0 0
5 . Aug. 1 4 - 1 9 , L. M a r c h a k A u ~ . 22-29
1 4 d a y s @ $ 8 7 . 0 0
6 . Aug. 14-19 P . Dunn S e p t . 1 -13 S e p t . 1 6 - 2 0
3 2 d a y s @ $ 8 4 . 7 5
B. FOOD A N D ACCOMMODATION i n c . H y d r o , p r o p a n e
1. T r a i l e r R e n t a l 40 d a y s @ $ 1 3 . 4 1 $ 5 3 6 . 4 0
2 . Cook 1 3 1 . 5 h r s @ 1 2 . 5 0 1 h r $ 1 , 6 4 3 . 7 5 '
3 . Food 1 4 2 man-days @ $ 1 0 . 5 8 $ 1 , 5 0 2 . 3 6 $ 3 , 6 8 2 . 5 1
C . TRANSPORTATION
1. 4 x 4 s u b u r b a n 40 d a y s @ $ 6 5 . 0 0 $ 2 , 6 0 0 . 0 0
2. T r a v e l E x p e n s e
D. CONTRACT
1. L i n e c u t t i n g 6 . 5 5 k m @ $ 5 0 6 . 5 6 o r May 3 1 - J u n e 6
1 4 d a y s @ $ 2 3 7 . 0 0
E . INSTRUMENT RENTAL
Aug. 1 4 - S e p t . 9 1 . Magnetometer 8 d a y s @ $ 9 9 . 0 0 $ 7 9 2 . 0 0
(Edna Omni IV t o t a l f i e l d w i t h b a s e s t a t i o n )
2 . P u l s e EM 23 d a y s @ $ 3 3 3 . 0 0 $ 7 , 6 5 9 . 0 0 $ 8 , 4 5 1 . 0 0
F. SUPPLIES
1 . F l a g g i n g , f r e i g h t , e t c .
G. REPORT PREPARATION
1. T y p i n g , d r a f t i n g , e t c .