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TRANSCRIPT
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41N02NE9200 SLATER 19 Al SLATER
PROM
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T s a a p o R
BOflCAM MII?E3 LTD.
s*i*-"'-, tv-a"! -•'. ?
Township ^), Hnnge XIV Dlatriot of
T. R, . v ..Geo.logiat t Prof. En g,
Suofiltted as Asaess-nentby
Mines Limited
Executive Office ~-
3100 - 2 * Xlng ut. West, Toronto, Ontario.
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The Boboam property was staked by Mr, Robdrt Caiapbell In October 1948 after discovery by him of pitchblende on Theano Point. The claims were then taken over by Bob cam Mines Limited, tinder the same management as Camray Mines Limited. Development work was begun in April 1949 and terminated for the season In November 1949.
LOCATION AND ACCESS
The property is contiguous with and to the aast of the Camray Mines property at Theano Point, Lake Superior. Highway Ho. l? from Sault Ste. Marie passes through the property at mileage 73 north of that city. This highway gives excellent access to the property.
PROPERTY
The company holds a single block of 21 claims numbered SSM 16054 to 3SM 16074- inclusive. These claims cover an area of approximately 830 acres.
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QEOLOQY OF BOBCAM PROPERTY
TABLE OP FORMATIONS
Pleistocene ~
Keewenawan -
Algoman (?) -
Pre-Huronlan
Boulder clay and gravel
Quartz diabase
Oranite and Pegmatite
Gnviiss and Paragnelas
TOPOGRAPHY
The area covered, by the claims consists of fairly rugged terrain with some open flat valleys between the hills. The slopes of the hills are mostly moderate but some are precipitous. Drainage Is good due to the hilly nature of the country and the porous nature of the overburden. Swampy ground occurs only near the west end of Casey Lake.
PLEISTOCENE
Overburden covers the greater part of the claims{the outcrops which occur are usually confined to the higher ground which is underlain by granite. The soil covering is very deep in the south-western part of the area where extensive beaches, foraod at previous lake levels, occur. Maple, birch and pine grow to "^rg- sizes where the soil is deep.
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,: The largest diabase dikes on the Boboam property strike approximately H *ft ** Lesser dikes Strike N TOT W and H TO5 B. The dip of the dikes is towards the north at high angles. The dikes are fairly massive. Shearing is local and not severe. Alteration of the diabase has taken place to some extent in the area where pitchblende is found* The alteration minerals are chlorite, epidote, soisite, sericite and carbonate.
ALOORAN (?) ORANITE
This granite is classed as pre-huronian and possibly Algoman in age by reference to the"Lake Huron Sheet11 map 155*. by the Ontario Bureau of Mines. It contains pigmatltio phases aa well as normal medium grained granite. The granite is pink in colour, due to the high -.roportlon of pink feldspar. The mica present is white prd occurs in minor amounts as does quartz.
GNEISS AND PARAGNEISS
Gneiss is well represented on the Boboam property. It is present in varying stages cf alteration, from remnants showing banding to small inclusions a few Inches in diameter and composed chiefly of coarse mafic minerals with minor amounts of magnetite.
MINERALIZATION
flTCHBLBNDE
A small amount of pitchblende has been found in the diabase and IB fractured granite close to the diabase. The pitchblende Is In narrow velnlets accoo- panied by carbonate.
No other minerals of economic Importance haft been observed.
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STRUCTURAL CONDITIONS
" * ,, Ho extensive faulting has been found on the Eoboas property. Shearing- is apparent in some of the dikes* On claim 3SH 16055 t large area of breccia exists where diabase has invaded the granite walls. The breccia consists of diabase matrix holding small inclusions of pifmatitt.
DKVELOPMBKE WORK
CONTROL 3URVEXS
li transit and tap a were used to run an astronomic east-west base line across the north end of the property. Picket lines were set off at right angles to this base line at 400 feet intervals. Stations were then established on the picket lines at 100* intervals. The transit was used to project the picket lines across Casey and Campbell Lakes, and when the picket lines were finished a stadia survey around the property tied in the ends of the picket lines. The directions on the map are oriented to astronomic north.
k total of 18^ miles of picket line and 1^ miles of base line were out and 9,83 stations were established on the picket lines.
GEOLOGICAL MAPPING
The property was mapped on a scale of 200* to the inch. Since pitchblende is found in close assoc iation with the diabase dikes particular attention was paid to mapping the dikes and examining their contacts.
GEOPHYSICAL SURVEYS
A magnetometer survey was made of the property in order to trace the diabase dikes under the overburden. A geiger countar survey was also made, using an KA-130 made by Electronic Aasoclr.tes. Where outcrops 7/ere numerous and where overburden was heavy the survey was made by Mining Geophysics Corp. using an extremely sensitive Geiger counter.
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HCPIOXKD ON GEOLOGICAL S0KTOC
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Remarks
U d ̂ .JUULgOUTi .BsC: Prof Kng..
Sault Ste. MarieApr 30 - Hov l
T, Keele,BsC. Prof Bng.
Seaforth, Ont. Apr 30 - Nov 30
J. B. MoLuskey 163 Walner Rd. Toronto. Ont. May l - Sept 30
L, Noil.529 Olengrove W Toronto May l - Aug 17
E, Petersen tSault Ste. Marie May l - Nov 30
W. Parniak,Sault Ste. Marie May 23 - July 4
L. Andre. S. 3te Marie May 23 - June 4
C. McKinnon, Desbarats, Ont. llay 23 - July 4
U, Cranston, Woodstock, Ont. June 4 - Sept 30
H. Dallaire,Sault Ste. Marie, May 23 - June 4
30
10
20
60
28
8
8
20
10
10
10
15
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Manager
Geologist
Asst. QeoX*
Tech. Astt.
Chief Line Cut
Line cutter
H
- total 211 days
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OP PITCHBLEHDB ZONKS to IXKfOST ?0, 1949
Wo. l * Claim 1606A
High readings on the geiger counter vcre noted in the south vest corner of this claim. Stripping exposed a diabase-granite contact with a shearing at right angles to the contact. Pitchblende was found in the shear. A TTarsop rook drill was used to trench this xone. Two pitchblende stringers about J" wide and 2* long were exposed as well as a number of small fractures which w*re radioactive. The shearing was followed south-west for two hundred feet to a second diabase dike. Radio activity was found in this dike for some distance along the shear* but no visible pitchblende could be found.
Zone No. a - Claim 16054
High readings were obtained by the Mining Geophysics Corp Geiger counter at a point 100' west of Hue 32E and 300' south of the base Una. A trench was dug at thii spot but had to be abandoned before bedrock was reached due (.o the large amount of water encountered.
] Zone No. 3 - Claim 16060 and 16056
1 The Mining Geophysics Geiger counter surveyl gave high readings on line 36B qbout 500' south of Campbelljj Lake. Five trenches were dug In the area. Only two ofi these reached bed rook, which at that point did not giveJ any radioactive indications. The results are consideredi inconclusive.
l M/VGNISTOMSTER SURVEYt, .! Reason for Magnetometer Survey
About 70# of the Bobcam property is covered with overburden; of the remaining 30# the best exposures are of granite and gneiss. The diabase dikes aro in low ground and are poorly exposed. All known occurrence of pitchblende in the area have been found in diabase dykes or In granite at the diabase-granite contact. In order to find
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the favorable places in which to looX for pitchblende It was decided to locate the diabase dikes by means of a magnetometer survey as suggested by Dr* A. H. Lang in his "Report OD the Caaray Uranium Discovery. 11 This survey was carried out in the months of June July and August 1949,
TYPB OF INSTRUMENT
The Instrument used was a Sharpe B-l magnetometer with a sensitivity of 35 gammas per scale division.
RESULTS OF MAGNETOMETER SURVEY
The diabase dikes in the area give a value about 300 - 400 gammas above the values of the surrounding granites. In one or two areas hiph readings were obtained on outcrops of granite which contained considerable included mafic material. This amphobolite is probably the remains of old sediments instruded by the granite. The high magnetic attraction can be accounted for by small amounts of magnetite in the amphibole fragments.
The magnetic contours on the accompanying map which have values of 1400 to 1700 gammas enclose the known outcrops of diabase as shown on the map in colour. In overburdened areas the pattern of lenticular contour- having values of 1400 or 1700 gammas is assumed to be c ised by diabase, especially when these contours include a din base outcrop or have a strike si-nllar to that of known diabase dikes. High readings due to magnetite in the granite can be eliminated in some cases by inspecting the area for outcrop, or, If none is available, by the circular pattern of the anomaly. The results of the magnetometer survey are shown on a map havinp a scale of l" * 200' on which the gamma readings are contoured and the actual outcrops of diabase aj** probable drtes ajre show,n in; green.
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, T. R; Heale BSol - Seaforth, Ont.
7 Apr 30.- Hov 30 10 '' '~ ' ' " - ' . ^
' -- J* B* MoClusky,163 Vf aimer RdToronto. Ont, s*~-Hay 1 - Sept 30 ^49 -^**.,~^
L. Nell
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l Toronto. Ont.J May 1 - Aug 15i .'- M , Cranston fi Toronto,* June 4 - 3apt 30S . .
R. Petersen,Sault Ste. Marie
i May 1 - Nov 30 10•l '| W, Parnlak,' Sault Ste. Mariej May 23 - July 4' L. Andre.' Sault Ste. Marie
May 23 - July 4i
- C. McKinnon,Desbsrats. Ont.
Mav 2^ - July 4
i 45 49
Tech20 10 Assistant
Tech10 Assistant
Chief10 "' 5 ' Line
10 ' Line
10 H
10 "
50 29 40
cutter
cutter
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- Total 213 days
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RBPORT Qg TOE R/UHOACJIVITY SUHVBY
rf' ' '-. Of a part of
BOBGAU IQKEB UJCTED.
SAULT STE. UARIK UIlttlB DIVISION ONSfUlIO
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Of a part of
BOBCAM MINES LIMITED
SAULT STE. MARIE MINING DIVISION ONTARIO
••sit::f"! " '"ft*-
A radio&otiTdty survey was carried out over a portion
of Bobcam property, namaly claims 16060, 16061, 16065, 16069 to 16074 (incl),
located in the Theano Point area. Township 29, Range 14, Sault Ste. Marie
Mining Division. The survey was carried out using a Super Geiger Counter
(M.Q.C. # 1).
LOCATION AND ACCESS
The Boboam property lies 73 miles north of Sault Ste. Marie
by highway. The HigKvry, No. 17 crosses the western portion of the claim
group. The property ties on the eastern end of Camray Mines Limited.
PREVIOUS V/OEK
A report on the general area was published by the Ontario
Department of Mines, written by E. S. Moore . Since staking, the property
has been generally prospected, and surveyed with the magnetometer by the
Company.
GEOLOGY
O
E. S. Uoore reported the area to bo underlain by Algoman
granite cut by Lower Keweenawan diabase. The outcrop exposures on the
1. Moore, E. S., Ont. Dept. Mines, Vol. 35, Pt. 2, 1926.
2. Moore, E. S., Ibid.
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erty consist rnainly of granite, syenite, and hybrid gneiss, cut by
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- CEEOPHYSICAL SURVEY'-'j '' ' 111' '; - - ' ''/-/'--'--"
A Super Geiger Counter survey was carried out over nine
of the twenty-one Bobcam claims* The survey was conducted "by G. F. TOLlcox
using the M* G. C. # l Counter*
The southwest portion of the property was surveyed by
continuing the Camray picket linos across the property. The balance of the
survey was carried out over picket lines, turned off from one Bobcan base
line near the northern property boundary. The picket lines wore turned off
at right angles to the baselines at 400 foot intervals. Geiger readings
were recorded every 100 feet, unless higher readings were noted, in which
case readings were taken every 25 feet. The total footage surveyed was
42,365 feet and the number of observations was 457. The readings over the
surveyed area were low except at one point on Bobcam picket lines 4 W and 0*0.
A portion of a prospecting traverse along a gulley on Claim 16054 also gave
higher readings*
CONCLUSIONS
The portion of the property surveyed has relatively no
variation from the background geiger count except in one case, where a
reading of 4.2 was obtained on picket line 4W on Claim 16065. The count could
emanate from a uranium source, but also is of the order obtained fron
pegmatite or gneiss which has been tested elsewhere on the property.
The most promising readings were obtained in a gulley on
Claim 16054. A magnetometer survey has indicated a diabase dike to occupy
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the readings nay be of significance, considering
pitchblende deposition on the Camray property*
RECOMMENDATIONS
It is recommended that the following investigations be
made s
l* The source of the Geiger Counter anomaly in Claim 16065 should be determined*
2. That the northern portion of the property including Claims16062, 16063, 16066, 16067, 16054, 16055 and'16058 be surveyed using the M.G.C. Super Geiger Counter. In any event the cause of the higher readings shown on Claim 16054 should be ascertained*
Respectfully submitted,
MINING GEOPHYSICS CORPORATION LTD.
G* M. Robson N. B. Keevil
Toronto, November 3, 1949.
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^APPENDIX
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1"•'^~
Bobcam Mines Limited situated in the Theano Point area. Township 29, Range 14, Sault Ste* Marie Mining division, Province of Ontario, comprising twenty-one claims, viz;
16054 to 16074 (inclusive)
The survey applied to nine claims, viz; 1606C, 16061, 16065, 16069 - 16074 (inclusive).
Dates of Surreyt
Radioactivity Measurements - August 4-6, 1949 (l man) August 7, 1949 (amen) August 9, 1949 (2 men)
Plotting, interpreting, mapping - October 12 - November l (4 men
intermittently)
- 3 man days- 2 M M- 2 " n
- 4
Total - 11 n it
Baseline and Picket Lines:
Nine north-south picket lines in the western portion of the property were turned off at right angles to the Camray base line at 400 foot intervals Eleven north-south picket lines were turned off at right angles to the Bobcam base line at 400 foot intervals.
Miles of Line t 8.0 miles
Instrument Operator i G. F, Wilcox
Draftsmen! LI. Arnott et al
Instrument Used: Super Geiger Counter (M.G.C. #1).
Mb* of Radioactivity Measurements; 457
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-ttN02NE920ia SLATER 19 A1 SLATER 030
8 P bt T
on tht
H A. D . Q A C T I V I .T Y S TT R V BY
of a part of
Township 29, Range XIV District of Algona
3y R. J. Kilgour, B.Se., Mining Engineer, Prof. Eng,
l
lc; j Submitted as assessment workby
Bobcam Mines Limited
Executive Office - 3100 - 25 King St. West,
Toronto, Ontario.
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IWTRODUCTIOH
A radioactivity survey was carried out over a portion of Boboaa Mines Ltd* property, namely claims 16054, -55, -56, -57, -58, -55, -62, -63, -64, -66, 67,68, in conjunction with a similar survey made by Mining Oeophysles Corp. of Toronto* The area surveyed by Boboaa Mines Ltd* consisted of that part of the property on which outcrops were fairly numerous. The remainder, having a great deal more overburden, was surveyed by Miniag Geophysics Corp. whose surveying instrument was much more sensitive that any available to this Company.
LOCATION AND ACCS33
The property adjoins Camray Minos to the East and South. Highway No. 17 crosses the property at rnlXa 73 north of Sault Ste. Marie and permits ready access to it.
PROFERTY
The company holds a single block of 21 claims numbered SSM 16054 to 16074 inclusive, covering approx imately 8^^ acres.
PREVIOUS WOWC
Since staking, the property was generally proopected. A base line running east-west was run by tape 9 and trans!t,picket lines were turned off at 400 foot centres and run north-south. Stations were o*t on the picket lines at 100 foot intervals.
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1 GEOLOGYt•4. The geology of the property is covered by the
accompanying geological report.
RADIOACTIVITY SURVEY
In oonjujction with the geological and magneto meter surveys, a controlled radioactivity survey was made. This was made to ensure that the property was thoroughly examined for radioactivity by making the examination in a systematic manner and as a guide to further exploration by prospecting and trenching.
The survey was carried out during the 7 weeks period from July 2 through August 37* 19^9. Two Geiger- Mueller counters t cade by Electronic Associates Ltd., Toronto y were used for the survey. The EA-130 type instrument with ratemeter attachment wqa used for most of the survey, while the EA.-100 type was used for a tihor t period when the LA-130 was under repair. Due to this fact some ret-^ags are in microamperes read on the ratemeter scale while the balance am recorded t*s counts per minute heard in earphones.
A base station and a series of check stations covering the area surveyed were established. Dally observations at base and convenient check stations were made to correct for changes in background count due tc varying cosmic ray activity. These chocX observations were used to reduce counter readings to a common denominator.
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CONCLUSION
Prom the turvey results It would appear that th9 north-eait corner of the property la the moat interesting single area. This conclusion was reached after noting that the background count throughout the area was consistently high. The only major outcrop In the area, at 8+10N on line 444-OOB, gave a count of 4 times this accelerated background count. Red staining vaa seen'on this outcrop. Further evidence comes from the high readings obtained from fractures, in pegmatite, striking N 15* W, on line 40/OOE at 6/OON and
j A detailed study was made along the granite-' diabase contact on the south wall of the diabase dikeL running east from 36/OOS on line 20/OOE to 38/003 on; line 24/OOB. Readings were taken at l? feet intervalsJ but no significant anomalies were noted.
* High counts were obtained from fractures, which? contain hematite, at 247*003 on line 87*OOW, 307*003 onj 8/OOS and at 3VO03 on 4/OOW. The latter two readingsj are Interesting in that they are in an area of fracturedij diabase which gives some evidence of radioactivity.
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Bobca* Minet ltd*; aituattd in Twp 29, Range XIV, Satat Ste. Marie Mining Divisionf conflating of twenty-one claiflf, vies ;" - ' -.
58M 16054 to X6074 Inclusive
The survey applies to twelve olalm*,SSM 160J4 -55 -56 -57 -58 -59
16062 -63 -64 -66 -6? -68
f Srve t
Radiomotivity measurement -
July a - Aug 12 ( l nan) Plotting i napping -
42 man days
Oct. l - Dec. 15(l man intermittently)12 "
Total
Miles of line
No. of radioactivity measurements
54 H
11.5811
Instrument Operator - L . \. Nell, 529 Olengrove \vw.,Toronto, Ont.
Draftsman
Instruments used -
H. Petersen, Box 385.Sault 3te. Marie, Ontario
KA-130 Geiger counter EA-100 Geiger counter
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