PDF Report - Province of British Columbia

PDF Report - Province of British Columbia

GEOLOGY ATD ROCK GEOCHEMISTRY
MLJUH PROPERTY
54'
25'N,
127'
10'1?
ASGER BENTZEN
under t h e supervision o f
G. E. DIROM P. ENG.
NORANDA MINES LIMITED
OMINECA MINING DIVISION
July 4th, 1971
- July
July 7th, 1972
-
l l t h , 1971
July 15th, 1972
I( Mines andD e pPaert rt omlecnutm
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TABLE OF CONTENTS
INTRODUCTION
#\
~ i g .1. (Location Map)
SrnlARY
GEOMGICAL SETTING
GEO rnGY
ROCK GEOCEIEMI STRY
ECONOMIC GEOMGY
Table 1. (Assay Results)
References
Pa
Fig. 2. (Rock Geochemical ~ a p )
Fig. 3. (Geological ~ a p )
Statement o f Q u a l i f i c a t i o n s
I n pocket
IT
Appended
Omineca M.D.,
93LfbE
B.C.
GEOLOGICAL AND ROCK-GEOCHEMICAL SURVEY REPORT
ON THE
LOLJUH PROPERTY
NORANDA MINES LIMITED
INTRODUCTION:
The Laljuh Property r e f e r r e d t o i n t h i s r e p o r t i s located
approximately 28 m i l e s south of Smithers, B r i t i s h Columbia a t t h e headw a t e r s o f Loljuh Creek i n t h e e a s t e r n p a r t o f t h e Telkwa Range (See Fig.1).
Access t o t h e property i s by h e l i c o p t e r from t h e Smithers h e l i p o r t t o a
landing s i t e w i t h i n t h e claim group.
The p r o p e r t y c o n s i s t s of 11 contiguous mineral c l a i m s i n t h e
Omineca Mining Division of B r i t i s h Columbia (See Fig. 2).
The claims a r e a s follows:
Claim
-
Rock #I34 -
Rock $107
Rock # 1 Fr.
Record Date
Record Number
114
June 29th, 1972
50414
135
August l s t , 1972
51999
J u l y lBth, 1973
?
Owner
50421
Noranda Mines Limited
52000
Noranda Mines Limited
Noranda Exploration
Company, Limited
Exploration work c a r r i e d o u t on t h i s p r o p e r t y i n t e r m i t t e n t l y s i n c e
1967, i n c l u d e s a c u t and flagged g r i d , a soil-geochemical survey, seven
diamond d r i l l h o l e s , and a magnetometer and electromagnetic survey,
The w r i t e r
and one a s s i s t a n t spent t h e p e r i o d s J u l y 4 t h t o J u l y l l t h , 1971 and J u l y 7 t h
t o J u l y l 5 t h , 1972 on t h e property conducting g e o l o g i c a l and rock-geochemical
s u r v e y s t o a i d i n t h e e v a l u a t i o n of i t s mineral p o t e n t i a l and t h e i n t e r p r e t a t i o n o f e a r l i e r surveys.
Control f o r t h i s work was provided by an e a r l i e r e s t a b l i s h e d c h a i n
and compass g r i d , topographic mapping by Lockwood Survey Corporation from B. C.
Government a i r photographs, and t h e a i r photographs themselves.
The main a r e a of t h e claims i s l o c a t e d on a bench-like s t r u c t u r e
w i t h an e l e v a t i o n of 4,000' t o 4,400'
and i s bounded t o t h e south-east by t h e
v a l l e y o f Loljuh Creek and t o t h e n o r t h by a peak of 5,600'.
f o r e s t e d , b u t t h e r e a r e many swamps, and drainage is poor.
5,000'.
The a r e a i s w e l l
The t r e e l i n e i s a t
Depth of overburden near t h e d r i l l - s i t e s averages e l e v e n f e e t but may
i n c r e a s e t o t h e south-east.
Rock exposure is mainly confined t o a l p i n e ridges.
StmMARY:
The claim group i s u n d e r l a i n by a n d e s i t i c and d a c i t i c t u f f s , flows
and greywackes o f Middle Lower J u r a s s i c age belonging t o t h e Hazelton Group.
These rocks have been intruded w i t h i n t h e claim group by a monzonite s t o c k of
p o s s i b l e Upper Cretaceous o r E a r l y T e r t i a r y age, and by small bodies of q u a r t z
d i o r i t e and f e l d s p a r porphyry.
Associated w i t h t h e i n t r u s i o n s i s a magnetite
h a l o o c c u r r i n g i n t h e v o l c a n i c rocks bordering t h e igneous c o n t a c t , and a
d i s c o n t i n u o u s zone of p y r i t i z a t i o n i n t h e rocks on both s i d e s of t h e contact.
Copper m i n e r a l i z a t i o n i s a s s o c i a t e d w i t h t h e p y r i t e , b u t o c c u r s a l s o , though
t o a l e s s e r e x t e n t , i n t h e i n t r u s i v e rocks.
GEO LL)G ICAL SETTING :
The e a s t e r n p a r t of t h e Telkwa Range i s u n d e r l a i n by a n d e s i t f c and
d a c i t i c v o l c a n o c l a s t i c rocks w i t h minor sediments belonging t o t h e Middle Lower
J u r a s s i c s e c t i o n o f t h e Hazelton Group.
Red h e m a t i t i c t u f f s and t u f f a c e o u s
b r e c c i a s , commonly with o r t h o c l a s e v e i n i n g , a r e t y p i c a l .
i s i n t h e p r e h n i t e o r e p i d o t e f a c i e s . (Richards, 1972).
Regional metamorphism
Emplaced i n t h e
v o l c a n i c s a r e s t o c k s of Upper Cretaceous o r E a r l y T e r t i a r y age (Armstrong, 1944).
Commonly t h e v o l c a n i c rocks bordering on t h e i n t r u s i o n s become d a r k e r due t o
a n enrichment i n magnetite.
( ~ r o w n , 1967; Richards, 1972).
GEOIOGY:
Approximately h a l f of t h e a r e a covered by t h e Loljuh claim group
i s u n d e r l a i n by rocks o f v o l c a n i c o r i g i n ; t h e balance by p l u t o n i c rocks.
For d e s c r i p t i v e purposes t h e v o l c a n i c rocks have been divided i n t o
three units:
Unit t'A'' occurring i n a s i n g l e outcrop near t h e western corner of
t h e p r o p e r t y , c o n s i s t s o f red and green p y r o c l a s t i c rocks,
The red colour i s
a t t r i b u t e d t o t h e presence o f abundant hematite and t h e green c a l o u r t o t h e
presence o f c h l o r i t e ,
Unit tfBts,
comprisi% dense greenish-black p y r o c l a s t i c rocks and
minor u n d i f f e r e n t i a t e d amygdaloidal a n d e s i t e s , is considered a n a l t e r e d equiv a l e n t o f Unit ISA".
It u n d e r l i e s t h e north-western and f a r s o u t h - e a s t e r n
s i d e s o f t h e claim area.
The e f f e c t s of c o n t a c t metamorphism a r e i n d i c a t e d
i n t h i s u n i t by t h e presence of magnetite r a t h e r t h a n hematite and weak t o
i n t e n s e h o r n f e l s a l t e r a t i o n . Epidote and o r t h o c l a s e v e i n s and replacement
masses a r e common; however, t h e s e may i n p a r t r e f l e c t t h e e f f e c t s o f r e g i o n a l
metamorphism.
Unit "Cn l o c a t e d i n t h e n o r t h e r n c o r n e r o f t h e p r o p e r t y , c o n s i s t s of
!
i
a s e c t i o n o f well->bedded v o l c a n i c sediments, commonly a medium t o c o a r s e
g r a i n e d greywacke, which i n hand specimen appears f r e s h and unaltered.
U n i t s A, B, and C c o r r e l a t e w i t h t h e Middle Lower J u r a s s i c s e c t i o n
o f t h e Hazelton Group found l o c a l l y and a r e l i k e l y t h e "Red Volcanic" u n i t a s
d e s c r i b e d by Tipper (Tipper, 1971).
The p l u t o n i c rocks comprise t h r e e u n i t s :
Unit "Dtt,
3,000'
a medium-grained monzonite, extends a s a s t o c k about
a c r o s s i n t o t h e c e n t r a l p a r t of t h e p r o p e r t y from t h e north-east.
The
composition i s 40% p l a g i o c l a s e , 25% o r t h o c l a s e , 25% hornblende, and 10% b i o t i t e .
The i n t r u s i v e i s s l i g h t l y p o r p h y r i t i c with r e s p e c t t o p l a g i o c l a s e .
The horn-
b l e n d e o c c u r s g e n e r a l l y a s anhedral masses, but may a l s o occur a s f i n e needles.
Unit "Et* i s a minor outcropping of f e l d s p a r porphyry i n t h e western
c o n t a c t zone o f t h e monzonite, and may be e i t h e r a dyke o r a v e r y small i n t r u s i o n .
The rock h a s a somewhat v a r i a b l e composition, b u t a t y p i c a l sample contained:
35% p a r t i a l l y resorped phenocrysts of p l a g i o c l a s e , about 2
llgn
i n diameter, 30%
f i n e - g r a i n e d mafic minerals, 35% groundmass, and a minor amount o f p y r i t e and
chalcopyrite.
Unit "Fit i s found o n l y i n diamond d r i l l h o l e s number 2 and 4, which
a r e s i t u a t e d o n t h e western c o n t a c t zone o f t h e monzonite stock.
The p e t r o -
g r a p h i c name o f t h e rock is u n c e r t a i n s i n c e i t s t r u e n a t u r e i s obscured conside r a b l y by o r t h o c l a s e , q u a r t z , and p y r i t e v e i n i n g and replacement, however, a
t e n t a t i v e i d e n t i f i c a t i o n i s fine-grained q u a r t z d i o r i t e ,
The monzonite s t o c k was mapped by Armstrong a s being o f Upper
Cretaceous o r E a r l y T e r t i a r y age (Armstrong, 1944).
Except f o r a dyke of u n i t "F" i n t h e v o l c a n i c rocks t h e r e i s no
d i r e c t f i e l d evidence t o i n d i c a t e t h e r e b t i v e age o f t h e two minor p l u t o n i c
units.
A s e t of w e l l developed j o i n t s w i t h an average spacing of 5 cm and
an a t t i t u d e o f 652 10/90 is found i n u n i t s "B" and "Erl.
This set a l s o occurs
weakly i n t h e monzonite.
P y r i t e veining i s common, though s p o t t y , i n outcrop near t h e
c o n t a c t , but i n p l a c e s t h e p y r i t i z a t i o n i s h u f f i c i e n t l y i n t e n s e t o have developed i n t h e matrix of t h e rock.
P y r i t e content up t o 10% was noted.
The
a t t i t u d e o f t h e p y r i t e v e i n s f r e q u e n t l y c o i n c i d e s w i t h t h a t o f t h e above
mentioned j o i n t s .
The a v a i l a b l e geological evidence favours t h e idea t h a t t h e c o n t a c t
between t h e v o l c a n i c s and t h e monzonite u n i t should b e d e t e c t a b l e by a magnetometer survey.
The writer,therefore,concurs w i t h t h e conclusion drawn by Dirom
regarding i t s l o c a t i o n (Dirom, 1969).
ROCK-GEO CHEP41STRY
Chemical a n a l y s i s of rock c h i p s sawn from rock samples obtained
from t h e 1971 survey i n d i c a t e d t h a t a rock-geochemical survey might be h e l p f u l
i n i n t e r p r e t i n g t h e copper soil-geochemical anomaly l o c a t e d p a r a l l e l t o and
west o f t h e b a s e l i n e between l i n e 8 n o r t h and l i n e 28 south.
As a result,
s i x t e e n samples were obtained i n 1972 w i t h t h e rnajority.from t h i s area.
The sampling technique involved d e s i g n a t i n g one o r two a r e a s on
an outcrop t o be sampled, and t h e n c o l l e c t i n g s i x t e e n rock c h i p s of approximately
t h e same s i z e from random l o c a t i o n s w i t h i n each area.
The samples were placed
i n 8" X 13" sample bags o f 6 m i l p l a s t i c , on which were marked an i d e n t i f i c a t i o n
0
number w i t h an i n d e l i b l e f e l t pen.
A 1 1 samples were submitted t o Core
Laboratories-Canada, Ltd. and analyzed f o r copper, molybdenum, z i n c and
s i l v e r by N. Garner.
The samples were crushed and p u l v e r i z e d t o -100 mesh, 1.0 g o f
each sample were weighed o u t i n t o a t e s t t u b e c o n t a i n i n g 5 m l o f 1:4 p e r c h l o r i c
n i t r i c a c i d and d i g e s t e d i n a water-bath f o r 4 hours a t 1 8 0 ~ ~ A. f t e r cooling
each sample was d i l u t e d t o 15 m l with a s o l u t i o n o f A l C 1 3 g i v i n g a r e s u l t a n t
c o n c e n t r a t i o n of 1%AlC13.
The s o l u t i o n s were t h e n analyzed f o r copper,
molybdenum, z i n c and s i l v e r on a J a r r e l l - A s h Atom-Sorb Model spectrophotometer.
The s t a n d a r d s used were d i l u t e d s o l u t i o n s from prepared 1,000 ppm
F i s h e r s t a n d a r d s and a c i d c o n c e n t r a t i o n s were t h e same f o r both sample and
standard.
The rock-geochemical r e s u l t s have been l i s t e d i n Table 1 and
C:;
shown o n Fig, 2.
These r e s u l t s p l u s t h o s e from d r i l l i n g r e v e a l t h a t w i t h i n
t h e soil-geochemical anomaly, bedrock i s f r e q u e n t l y anomalous i n copper,
In
t a k i n g i n t o c o n s i d e r a t i o n drainage p a t t e r n s and depth o f overburden, it i s
concluded t h a t i n t h i s i n s t a n c e , a t l e a s t , t h e s o i l geochemical anomaly r e f l e c t s
t h e copper c o n t e n t of t h e under-lying bedrock.
Molybdenum, z i n c and s i l v e r
rock-geochemical v a l u e s show no s i g n i f i c a n t trends.
ECONOMIC GEOLOGY:
Copper has two modes of occurrence on t h i s property.
It o c c u r s a s
c h a l c o p y r i t e a s s o c i a t e d with t h e p y r i t e m i n e r a l i z a t i o n s t r a d d l i n g t h e c o n t a c t zone
o f t h e monzonite stock, and i n t e r s t i t i a l l y a s c h a l c o p y r i t e i n t h e monzonite.
The a r e a o f t h e soil-geochemical anomaly which c o i n c i d e s w i t h p a r t
o f t h e a r e a o f p y r i t i z a t i o n , has been i n v e s t i g a t e d by d r i l l i n g , and by t h e
p r e s e n t g e o l o g i c a l and rock-geochemical survey.
It is concluded t h a t t h i s
m i n e r a l i z a t i o n i s e r r a t i c and n o t o f economic i n t e r e s t .
The q u a l i t y o f i n f o r m a t i o n a v a i l a b l e on t h e second mode of
o c c u r r e n c e i s low.
Topographically t h e monzonite i n t r u s i o n i s h i g h l y
r e c e s s i v e and o n l y a few o u t c r o p s a r e a v a i l a b l e .
Furthermore, over-
burden t e n d s t o be deeper, t h u s r e d u c i n g t h e e f f e c t i v e n e s s o f s o i l geochemistry.
S i n c e t h i s t y p e o f i n t r u s i o n i s p o t e n t i a l l y a good h o s t f o r economic concen-
i
I
t r a t i o n s o f copper, and s i n c e b o t h t h e s t o c k and t h e a r e a s u r r o u n d i n g it a r e
geochernically anomalous w i t h r e s p e c t t o copper, i t i s recommended t h a t f u r t h e r
work, such a s an induced p o l a r i z a t i o n survey and/or t r e n c h i n g b e c a r r i e d o u t .
Respectfully submitted,
Asger Bent zen
Eng.
J u l y 31, 1972.
,
TABLE 1
Assay r e s u l t s on rock-geochemical samples.
Assays by Core Laboratories
Sample No.
Rock Unit
- Canada Limited.
Cu. gpm
Mo, ppm
*
Area on outcrop with v i s i b l e chalcopyrite,
*
Areas on outcrop free o f pyrite.
Zn, ppm
88. P P ~
lJ.,
A m s t r o n g , J. E.,
Brown,
REFERENCES
G.S.C.,
Paper ( ~ a p )44-23,
A. S u t h e r l a n d , B.C.
1944
M i n i s t e r o f Mines h Petroleum Resources,
Annual Report, 1967, p. 97.
Dirom,
G. E.,
Assessment Report
"Magnetometer and E l e c t r o m a g n e t i c
Surveys on t h e Loljuh Property",
Richards,
T.A.,
Tipper,
H.
1969.
p e r s o n a l comnunication, 1972.
Lower J u r a s s i c Volcanic Rocks o f t h e West Half o f
S m i t h e r s Map-area,
3. C.
(93L), 1971
-
M.T.S.,
-
B. C. Govt., A i r Photos, BC 5302-257, BC 5302-258.
Smithers, 93L.
CERTIFICATE
I, ASGER BEMTZEN, of t h e c i t y of Vancouver, Province of
B r i t i s h Columbia, do c e r t i f y t h a t :
1.
I am a g e o l o g i s t r e s i d i n g a t 3715 West 12th Avenue, Vancouver
B*C*
2.
R.Sc.
3.
I am a graduate o f t h e U n i v e r s i t y o f B r i t i s h Columbia with a
Degree (1968), Major i n geology.
I have been employed a s a g e o l o g i s t f o r Moranda Exploration
Company, Limited f o r t h e summers of 1969, 1970, 1971 and 1972.
Dated a t Smithers t h i s 3 1 s t day of J u l y , 1972.
Asger Bentzen, B-Sc.
CEEITIFIGATE
I, GAVIN EWAN DIROM, of t h e Town o f Smithers, Province o f
B r i t i s h Columbia, do c e r t i f y t h a t :
1.
I
am Geological Engineer r e s i d i n g a t 52 North 1 4 t h Avenue,
Smithers, B eC.
I am a graduate of t h e U n i v e r s i t y of B r i t i s h Columbia with a
2.
B,A.Sc,
Degree (1962) i n t h e geophysical o p t i o n o f Geological Engineering
and a bl.A.Sc.
Degree (1965) i n Geophys&Cs.
3.
I am a Member of t h e Canadian I n s t i t u t e o f Mining and Metallurgy.
4.
I am a r e g i s t e r e d P r o f e s s i o n a l Engineer i n t h e Provinces of
B r i t i s h Columbia and Ontario.
5.
I have been employed a s a g e o l o g i s t f o r Noranda Exploration
Company, Limited s i n c e June, 1962 and have h e l d t h e p o s i t i o n o f D i s t r i c t
Geologist
- Northern B,C.
s i n c e March, 1967.
Dated a t Smithers t h i s 3 1 s t day o f J u l y , 1972.
f
GAVIN E. DIROM, M,A.Sc.,
P.Eng.
*
p"da,
w
'-4
1'1.ovincc of British Columbia
@u mil:
i
WILLSON STATIONERS
gn t t f ~f l n t t p r o f
a statement
of Exploration ~ x ~ e n s eons l q contiguous Mineral
Claims i n t h e Omineca Mining Division having Record
NOS: 50424
50421, 51999
52000
-
-
I, Asger Bentzen (F.M.C.
109106 I s s u e d A p r i l 28, 1972 a t ~ a n c o u v e r )of P. 0. Box 2169,
109101 issued A p r i l
Smithers, B. C., agent f o r Noranda Mines Limited, (N. P. L. ) (F.M.C.
28, 1972 a t Vancouver) of 1050 Davie S t r e e t , Vancouver 5, B.C.
7
of
in the .Provinctt of British Columbia.
Uu @ulpmnly B p t l ~ r pthat The a c t u a l c o s t s of g e o l o g i c a l mapping and rock geochemistry
including topographic mapping on t h e above l i s t e d Mineral Claims between J u l y 4/71
J u l y 11/71 & J u l y 7/72
J u l y 15/72 were:
-
1.
LABOUR
Asger Bentzen & J. Craig.
J u l y 4/71
J u l y 11/71
16 man-days @ $31.30/man-day
-
$500.80
Asger Bentzen & K. Bond,
J u l y 7/72
J u l y 15/72
10 man-days @ $31.30/man-day
=
$313.00
=
$311.70
-
-
-
T o t a l Labour
2,
TRANSPORTATION
1971
- Okanagan Helicopter.
- 75 mins @ $250/hr.
1972 - Okanagan Helicopter.
Bell-206A
Bell-206B
( ~ o tclaimed f o r
assessment c r e d i t ) =
- 80 mins @ $258/hr.
N.
C.
Total Transportation
3.
TOPOGRAPHIC EWP I N G
- Lockwood Surveys - $455.40 (1971)
- estimated p o r t i o n a p p l i c a b l e - 25%
4.
ROCK GEOCHEMISTRY
5.
4 elements (Cu, Mo, Zn, Ag)
-
$
55.20
26 man-days @ $7.00
-
$
182.00
-
$1.476.55
FIELD COSTS
-
Total
$1,000.00 of t h i s t o t a l i s being claimed f o r assessment c r e d i t .
An3 I make this solemn Declaration conscientiously believing it to be true, and
knowing that it is of the same force and effect as if made under oath, and by virtue
of the Canada Evidence Act.
I
Betlare3 before me
in the Province of British Columbia.
*)
this
day of
I
1
I