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2.3020 DORION 010
INTERPRETATION REPORT
AIRBORNE GEOLOGICAL; SURVEY
of the
M16 l 31979
UNDS SKT,ON
DORION PROPERTY
and
TARTAN LAKE PROPERTY
in
ONTARIO
for
ESSEX MINERALS COMPANY
by
GEOTERREX LIMITED
84-164
JUNE 1979
OTTAWA, ONTARIO
R.K. DOWSE M. GUDJURGIS R.S. GRAHAM
Geophysicists
geoteirex9 ltd.
An airborne geophysical survey was carried out by
Geoterrex Limited during the period of June 2 to June 3, 1979
for Kssox Minerals Company. The survey was in northwestern
Ontario in areas designated as the Dorion Property and Tartan
Lake Properly. The location of each area is shown on the KM
plan snaps. The base of the operation was in Thunder Bay,
Ontario.
The survey was conducted with a DCH-3 DeHavilland
Otter, with Canadian registration CF-AYR. Navigation of the
survey was by visual means utilizing photo mosaic prints. Mean
terrain clearance was 150 feet.
The specifications for the Dorion and Tartan Lake
Properties, as directed by Essex Minerals Company, were that
the survey lines be flown in an east-west direction at a line
spacing of 1/8 of a mile. A total of 60 line miles were surveyed,
qeoterrexSitd.
]3. CLAIMS COVERED
TARTON LAKE PROPERTY
465996 to 466000 484501 to 484533
DOR3ON PROPERTY
484730 to 484763 484800 to 484834
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The following Geoterrex personnel participated
in this survey:
A.
B.
Pilot
Navigator
Aircraft Engineer
Operator
Operator
Dei t a Compi l er
Geophysicist
2Oil9c Compilation
Data Compilation Head
Drafting Head
Geophysics;
H. Jensen
A. Tollcy
M. Palko
J. Blanchard
A. Proulx
H. Delachaussfie
R. Yee
P. Tallyhoe
R. Schingh
R.K. Dowse S, Graham M. Gudjurgis
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IV. HQUIPMKNT AND DATA RECORDING
The equipment on board the aircraft used for the
purpose of this survey is listed below:
a) Geoterrex in-phasc/out-of-phase electromagnetic system
operating at a frequency of 320 Hz.
b) Kxplcranium DiGRS 3001 4-channel gamma ray spectrometer.
c) Crystal Detectors - 4 Harshaw polyscin 4"x4"xl6" plus 4
Harshaw cylindrical 7"x4", Sodium Iodide (Thallium activated)
temperature stabilised crystal. Total volume is approximately
1639 cubic inches.
d) Geometrics Model G-803 proton precession magnetometer.
e) Geometrics Model G-704 digital data acquisition system.
f) 8 channel Technirite paper recorder.
g) Moseley 7100-B dual inch analogue recorder.
h) Sperry radar altimeter.
i) Intervalometer controlled fiducial numbering system.
j) 35 mm continuous strip tracking camera.
k) Cipher model 70 magnetic tape recorder.
The equipment is more fully described in Appendix
A.
The system is controlled by a command signal from the
spectrometcr, which through the intervalometer system synchronizes
the electromagnetic, magnetic and spectrometer sampling times with
the digital and analogue recorders and the camera times. There is
a time lag of a half second for the electromagnetic chart traces.
The KM system is calibrated prior to all survey pro
duction flights. Sensitivity of the system is checked by a con
trolled movement of the airframe. The chart is calibrated by a
standard 200 ppm anomaly and the gains are adjusted. A cross-
table is made to confirm that in-phase and out-of-phase positions
are 90 apart.
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The spectrometer is calibrated on Uranium and Thorium
sources. The four windows were set as follows:
Total Count - 0.4 to 2.82 MeV
Potassium - 1.36 to 1.56 MeV (K40)
Uranium - 3.66 to ].86 MeV (Bi 234)
Thorium - 2.42 to 2.82 MeV (Tl 208)
Spectrometer stability is achieved by maintaining
the Na3(Tl) crystals and photo multiplier tubes at a constant
temperature. The high voltage supply is closely regulated.
A system resolution determination was made prior to
the start of the survey. The thorium response was measured and
the data plotted to show exact peak shape. The system resolution
exhibited good results.
3n order to ensure spectrometer repeatability, the
following checks were performed:
A. System calibration was checked by placing sample sources of
Uranium and Thorium respectively in fixed post ions relative to
the detectors. Values observed less background counts remained
constant within 10?,.
B. Analogue chart xero and full scale positions were checked
and adjusted before and after each flight.
C. Atmospheric background was measured by flying over water at
survey altitude before and after each production flight.
The data was recorded at the following scales:
- Magnet i cs
- Full scale deflection of 1000 gammas on the
technirite 8 channel chart
- Scales of 0-1000 gammas and 0-10,000 gammas
on the Moseley 7100-B chart {for sensitivity see Appendix A).
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- AljL J
- Range of 250 feet from a base level of 50 feet
(50 '/era) .
n CPS ( 0 - ~ -- 4000 cps full scale
n CPS (3.3G - 1.56 MeV)
- 500 cps full scale
- J^rarn urn in cps (1.66 - 1.86 MeV)
-300 cps full scale
- Thoriujn in cps (2.42 - 2.82 MeV)
-300 cps full scale
~ ILrJ^Li- ^ ^rJ^]1!?? 0 channel
- 666.6 ppm full scale
~ ^''M' f -^iasc channel
- 666.6 ppm full scale
geoterrex9 ltd.
V. DATA REDUCTION
AB the flying progressed the flight path was verified
on a daily basis. KM and uranium anomalies were picked, rated and
plotted onto t lie flight path map.
Upon completion of the survey, the data was shipped
back to the office in Ottawa. The final flight plan maps and
mosaic, checked and improved, are then produced.
The raw edited digital spectrometer data was corrected
for atmospheric background, Compton scatter and aircraft deviations
from the planned survey altitude. Average background values were
obtained from the calibration flights carried out before and after
each production flight. Backgrounds subtracted were determined by
linearly interpolat ing on a time basis from the pre-flight average
to the post-flight average value.
Cornpton scatter coefficients were determined by
calibrating the aircraft spectrometer system on the Geological
Survey of Canada radiometric test pads located at Uplands Airport,
Ottawa. The coefficients obtained are:
uranium by thorium - 0.386
potassium by thorium - 0.426
potassium by uranium - 0.837
The altimeter attenuation coefficients were deter
mined by flying over the Breckenridge Test Strip near Ottawa and
the Ottawa River at several different altitude levels. The re
sults yielded the following attenuation coefficients:
total count - 0.00199 feet" 1
potassium - 0.00244 feet" l
uranium - 0.00219 feet
thorium - 0.00190 feet" 1
geoterrexSlid.
The d ata has not been reduced to indicate ppm U
hut j s compiled in counts per second (cps) response.
The computer programs used for correcting the spectro
meter data are described by R.L. Grasty, 1972, "Airborne Gamma
Spectrometry Data Processing Manual", GSC open file number 109.
The background corrected total count and the back
ground corrected, Compton stripped uranium data were manual
contoured to produce total count and uranium contour maps.
The magnetic data was compiled manually to produce
isomagnetic contour maps. The contour interval is 10 gammas and
values shown represent relative intensities.
neoterrex•Si ltd.
tVJ. DATA PRKSKNTATION
A. KM Plan Maps
The electromagnetic data is presented on airphoto-
mosaic base maps at a scale of 2:15,840 or 4 inches ^ l mile.
Claim blocks and numbers are drafted onto the photo base.
The In-Phase/Out-of-phase anomalies are portrayed
by symbol jsm and figures which provide the following:
- ratio of In-phase/out-of-phase, in ppm;
- peak position of the anomaly;
- terrain clearance of the aircraft, in feet;
- amplitude of any apparent magnetic anomaly, in gammas.
All conductive zones of interest, that is, those
which may be due to a bedrock source, are outlined, numbered
and discussed in Section V]I of the report.
The unnumbered single line KM anomalies with small
amplitudes are generally not discussed. Many have suspect
character and weak amplitude very close to the noise level.
Uranium anomalies selected in the field are shown
on the KM Plan map as well.
tt. M a o n e t i c C on tour MapjS
Total field magnetic maps were prepared using a
contour interval of 10 gammas. Values shown represent relative
i nt ensi t i es.
C. RadIK) metri c Maps
The corrected total count and uranium data are
presented as contour on photomosaic base maps at 1:15,840. The
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contour interval for each data set i s shown on each map sheet
Data "lows" are marked by "sharks teeth".
D . ^ 1 cord3
All the original analogue traces, properly identified
and edit cd, arc presented in book form.
E . TT ack i ng J^j 1m
The 35 mm tracking film is delivered in two rolls.
The supplied flight logs can be used to inter-relate all film,
records and flight path.
neoterrexS3 ltd.
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V]]. INTERPRETATION - GENERAL
The purpose of this airborne geophysical survey is
lo locate buried conductive geological units which could be
indicative of mineral deposits using combined airborne electro
magnetic, radiometric and magnetic techniques.
Thi s interpretation report deals mainly with the
electromagnetic results.
The first step in the interpretation is to group
comparable EM anomalies into zones which appear to define
conductors or geological units. The second step is to evaluate
each zone, as a bedrock or surficial conductor, and to assign
a priority rating for followup purposes.
It is difficult to assign a specific set of values
which signify conductive bedrock sources since any individual
zone or anomaly might exhibit some but not all characteristics.
The criteria considered as favourable pointers to
a bedrock conductor are:
1. Intermediate to high conductivity, In-Phase/Out-
of-phase ratios greater than 1.0.
2. Good anomaly shape; that is, narrow, relatively
symmetrical, round or sharp with well-defined peaks.
3. Associated magnetic responses with a similar strike.
The zone does not have to have an associated magnetic high but
should follow the general flow of the magnetic contours in the
area.
4. Similar orientation of the zone with the general
pattern or strike of the conductors and geology in the whole area.
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One of the most common types of bedrock conductors
is graphj t os, which tend to produce long, highly variable
conductors lyJng in parallel bands. They are generally not mag
netic unless associated with magnetite or pyrrhotite. The
apparent conductivity can be variable, but is generally quite
high. Uranium may occur with this type of conductor. Although
the uranium orebody J s generally non-conductive it is sometimes
associated with a conductive host rock of carbonaceous sediments.
Short, isolated and highly conductive zones are
usually indicative of massive sulphides. In regions of faulting
and extreme folding, however, long graphite formations could be
broken up to appear like more discrete, sulphide type prospects.
Magnetite and some serpentinized ultrabasic rocks
are generally more weakly conductive. Most of these sources
are mainly distinguishable because of their strong, often direct,
magnetic association.
Manganese oxides, some forms of hematite and low
concentration ores may give weak electromagnetic responses.
The above description covers most of conductors
which can be regarded as bedrock. Other conductors are those
in the overburden, in the weathered bedrock layer, or electro
lytes found in shears. These are generally referred to as
surficials. The most common surf i cial conductors are residual soil s,
salty deposits, clay minerals, river deposits, some swamps
and brackish ground water. They are usually poorly to moderately
conduct ive.
Once the conductive zone is classified as probably
bedrock or probably surficial, the next objective of the inter
pretation is to rate it according to its potential as a
conductive orebody. The rating system is based on geophysical
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parameters such as intensity, conductivity, uranium and magnetic
association, relative isolation, location and strike length.
The zones rated Priority l are recommended for
fo]lowup on a high priority basis. These indicate bedrock sources
with good potential for massive sulphide mineralization. They
are short, highly conductive, well isolated zones with good
magnet i c support.
Conductors rated Priority 2 are either possible
sulphides with fair potential or perhaps graphites which could
be of interest for uranium prospecting.
Third Priority Zones; these sources are of lower
potential because of weaker conductivities and amplitudes.
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VI ] l . ] NTHHPRKTATION OF SELECTED CONDUCTORS
This section contains a description of the conductive
zones on which ground fo]]owup is suggested on a priority basis.
In most cases ground followup of one or two anomalies within a
/one will explain the cause for the entire zone.
Kach /one is assigned a zone number for identification
purposes {eg D-l, TL-2). The letters D and T L proceeding the zone
number denote the areas surveyed, Dorion Property and Tartan Lake
Properly. Q1 h e order of zone numbers bears no relation to the
relative importance of the conductors. The anomalies within a
zone are listed and identified by line numbers, fiducial numbers,
and ratios. The purpose is to faciliate reference to the records
and plan maps.
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DORION PROPERTY
Zone D-l Priority 3
Line ] Flight 2 Fiducial 506.20 Fiducial 506.40
Ratio 40/5 Ratio 50/15
ANOMAL^KS: ShapeAmp]a t udeMag Associations
broad, double-peakedsmallnone
CONDUCTOR: Length Width Conduct i vi ty
unknown; one line;broadhigh
FI],M: Both peaks are located in bush.
REMARKS: This -/.one is located right at the edge of the survey. Thcf f uTl length and extension to the south is not known.
The anomaly is a small response with two, well resolved peaks. We suspect it represents a fairly deep bedrock zone con taining two bands, both of which reflect fairly high conductivity.
Followup is rated low or medium in priority.. T~heT unknown strike length and absence of any magnetic associationare the main reasons for downgrading the conductor.
geoterrex5! ltd.
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Zone D-2 Priority 3
Line 3
Line 4
Flight 2
Flight 2
Fiducial 478.20Fiducial 478.70Fiducial 456.70
Ratio 30/10 Ratio 50/20 Ratio 40/10
ANOMALIFS: ShapeAmp]iludeMag Associations
roundedsmallmagnetic high 80 to 120 gammasassociated with the zone
Length Width Conduct i vi ty
short, 1/4 milenarrowhigh
FILM: These anomalies are situated in bush,
rj 'h (~ anomalies in this zone are weak and poorly developed. The poor signature may be related to the depth of burial and to the rather high flying altitude recorded over this location (185 to 225 feet) or it may be due more to the nature of the source.
There is a magnetic association with two of the F,M anomalies (80 to 120 gammas). The contour map shows the magnetic high to be a very long trend running north-south for 2 or 3 mi les.
RFCOMMKNDATDONS: Low priority.
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Zone D-3 Priority 2
lone 2F: Flight 2 Fiducial 492.42 Ratio 60/30
ANOMA],]}'^S: Shape : roundedAmplitude : mediumMag Associations : none
f^^yCZ^B 1 I-on g t h : one lineWidth : mediumConductivity : high
FILM: This anomaly j s situated in bush.
RFMARKS: This anomaly J s well developed. It reflects a short bedrock conductor with high conductivity.
The conductor is located in an area of quiet magnetic activity. No direct magnetic association is evident.
RKCOMMKNDATIONS: Medium priority.
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Zone D-4 Priority 3
Line l Lane 2
Flight 2 Flight 2
Fiducial 503.10 Fiducial 493.93
Ratio 50/5 Ratio 70/15
ANOMALIES: Shape
Amp] i i udeMag Associations
Line l, narrow S sharpLine 2, broad-double peakedLine 2, weak; Line 3, moderate
small mag high 10 7 on Line 2
CONDUCTOR: Length Width Conduct ivi ty
unknownvariable (narrow to broad)high
F3LM: The anomalies are situated in bush.
REMARKS: This xone is located 1/4 of a mile beyond the boundary of the survey where coverage is incomplete. There is also the problem of the plane turning at the end of each line, which makes path recovery and location more difficult outside t lie grid.
The anomaly on Line 2 has the best signature in the /one, even though the flying altitude is very high on that line. The response has a rounded, well defined shape which suggests a bedrock source with high conductivity.
The anomaly on Line l is much sharper and narrower, Its spike-like shape looks abnormal and causes us to downgrade the xone.
RECOMMENDATIONS: Low priority.
19
Zone TL-]
TARTAN LAKE PROPERTY
Priority l
Lino 6W
lane 7E
Flight l
Flight l
Fiducial 341.85 Fiducial 342.10 Fiducial 320.20
Ratio 20/20 Ratio 30/10 Ratio 50/10
ANOMALIES: Shape
Anipl i tude
Mag Associations
rounded, well defined shapeon Line 7;two peaks on Line 6medium Line 7,weak Line 6broad 30 gammas on Line 6
CONDUCTOR: l,engt h Width Conduct ivi ty
: short; 1/4 of a mile: medium: intermediate to high
F3LM: The conductor is located in the bush.
REMARKS: The anomaly on Line 7 is the best looking EM response in the Tartan Lake Area. The well defined, rounded shape is suggestive of a bedrock source with high conductivity.
The EM response on Line 6 is weaker and wider with two penks indicated. This gives the impression that there may be two conductors on the south end of the zone. The ratios of these anomalies reflect lower conductivity than the response on Line 7.
The only magnetic association with the conductor is a .small, broad high of 30 gammas, directly coincident with one of the EM peaks on Line 6.
REJ^OMMENUAT3ONj3: Pol lowup should begin at Line 7. or high priority is recommended for this zone.
Medium
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Zone TL-2 Pr i or J ty 3
Line 7E Line 9F
Flight l Fliqht 2
Fiducial 324.35 Fiducial 540.70
Ratio 50/10 Ratio 40/20
AN OM AJ , K S : ShapeAmp] i iudeMag Associations
rounded, ncirrows ma] lnone
J ' c n 9 t hWidth Conducti vi ty
1/4 of a milenarrowhigh
F] LM: The conductor is located in the bush.
This FM -/one coincides with a weak uranium anomaly, the main reason for selecting the zone for followup.
The FM anomalies alone would not be considered very favourably. Both are weak and very narrow. Such responses could be due to a small or very narrow bedrock source, but they could also be caused by equipment noise. Because both responses reflect some irregularity of shape and because the local back ground noise is high due to turbulence, both anomalies are considered to bc poor prospects.
RFCOMMFNDAT]ONS: Low priority.
l ltd.
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Zone TL-3 Priorite
Line l 5E F]jght l Fiducial 161.30 Ratio 50/20
ANOMALIES: Shape : roundedAmplitude : smallMag Associations : none
CONDUCTOR: LengthWidthConductivity
single line?narrowhigh
FILM: Bush.
REMARKS: The KM anomaly is small but clearly above background on both channels. It looks like the signature of a bedrock source with good conductivity.
The main thing detracting from the zone is the fact that the anomaly is located outside the claim area where coverage is .incomplete. The conductor was detected on only one flight line and ihe length of the source is uncertain.
RECOMMKNDAT:I ON s: Low priority followup is suggested.
leoterrex
SUMMARY OF SELECTED CONDUCTORS
22
Pr .i or Jjt y
PROPERTY
D-3
Pr Jority 3
D-l D-2 D-4
Pr '.i or j j. y
TL-1
TARTAN LAKE PROPERTY
Priority 2 Priority 3
TL-2 TL-3
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4X. CONCLUSIONS AND RECOMMENDATIONS
1. Table J on the proceeding page summarizes the inter
pretation of the selected conductors in this survey. A total of
seven zones have been discussed. The first and second priority
selections are recommended for followup.
2. Zone TL-1 in the Tartan Lake Property is considered
to be a good prospect since it looks like a bedrock source with
high conductivity.
3. Zone D-3 in the Dorion Property is rated slighty
lower, but also looks like a fairly interesting target.
4. The remaining five zones are designated as Priority
3. These reflect weak conductors with apparent lower potential,
but they would warrant followup if the geology or uranium
association was favourable.
5. The remaining single line EM anomalies remaining on
the map are not recommended for followup at this time. These are
very weak or questionable conductors. They may be related to
equipment noise or to surficial conductivity.
Respectfully submitted ,' l ,, i, -- - \ \ } 'i- - ' i l '" { .
S l/ f) x . ,. \ !A A A*-ix'-4C ' ' ' '
R.K. Dowse , ' ' ' ' fl : \
M. Gudjurgis
R.S. Graham
geoterrex9 ltd.
APPFNIXIX A
Fo33owing is a description of equipment and procedures used during an airborne electromagnetic survey.
A. - KQU3PMKNT
3. Aircraft
The aircraft is a deHavilland Otter DHC-3 with Canadian registration CF-AYR. This aircraft is a sing3e engine, s3ow speed, high performance type with a gross weight of 8,000 3 bs. The aircraft may be equipped with wheels, skis, or floats, as required. Normal survey speed is 100 miles per hour.
2 . Fleet r oi"n a g n e t on i e t e r
The electromagnetic unit is a Rio Tinto type, measuring 3 ri--Phase and Out-of-Phase components of the secondary field at a frequency of 320 cycles per second. The unit was designed and built by Geoterrex, and carries Serial #1.
A transmitter generates a closely controlled sine wave of 320 cps which is amplified and fed to a transmitting coil mounted on the starboard wing-tip. This coil is iron cored and h as vertical windings, with coil axis in the direction of flight. The circulating coil power is some 5000 volt amperes.
A receiving coil is mounted on the port wing, co--pianar with, and 62 feet from, the transmitting coil. The vo3tage developed in the receiver coil due to the transmitted fie3d is some 300 millivolts. In the absence of external conductors, this voltage is cancelled by a 3eferonce voltage derived directly from the transmitter volt age.
When the aircraft comes within range of aconductor, t Vie normal (or primary) field is modified by a secondary field, and the resultant voltage at the receiver coil is amplified and passed on to the KM receiver in the aijoaft. This signal is filtered and split into one component in-phase and one component out-of--phase with refejence to the transmitter voltage. The signals are t lien passed through phase-sens:! t j ve detectors where their amplitude's may be lead on meters, or recorded on a chart. A time constant of 1.0 seconds is used for the recording of these responses. A system of calibration is included
so thai amplitude of responses (anomalies) may be determined in "parts per million" of the primary receiver coil voltage prior to cancellation. Noise level of ihe system due to movement of the metal aircraft within the EM field is normally 30 parts per million or less. Significant conductors depending on distance and sir;e, will produce anomalies of more than 50 parts per million.
The system is equipped with a third independent channel which may bc used to measure spurious electrical noise {independent of KM noise) at any selected frequency. Di is frequently used to display a second in-phase response at a time constant of 0.6 seconds which enables improved resolution for comparison with the normal responses.
Calibration marks are displayed on the eight- channel chart, and are approximately 15 millimeters for 200 parts per million.
Any anomalies noted are plotted on the plan map, indicating position, (fiducial number on the path recovery camera), amplitudes, aircraft altitude, and magnetic relationship, if any.
They are coded, depending on amplitude and magnetic association. Anomaly groups which reflect probable ground conductors are circled . and numbered. These are described and discussed in the report in the context of geophysical and where possible, geological si gni fi c: cine e .
3. Magn e t ome t or
The magnetometer used is a Geometrics Model C-803 Proton Resonance type incorporating a High Performance option. Recording times are variable, from three times per second to once per 2 seconds, with respective sensitivities of 2 g ammas to 0.5 gamma. ]n normal use, readings are obtained once per second with a sensitivity of l gamma.
The sensing head is a toroidal coil immersed in a special hydrocarbon fluid and mounted beneath the port w i n g .
The magnetometer outputs are fed to the eight- channel recorder for direct comparison with the electro magnetic results, and also to a Moseley 7100-B ten inch rectalinear strip recorder, for use in subsequent data reduction for contouring if required.
Fu.ll scale deflection usually used in mineral .surveys is 1000 gammas although other sensitivities are available. Automatic stepping of the full scale analogue deflection is incorporated.
4. Spectromet er
An Exploranium DiGRS-3001 spectrometer is carried on the Otter, along with a sensing head containing four Haishaw polycin 4"x4"xl6" sodium iodide crystals. Total volume - 1024 cubic .Inches.
This is a digital four channel differential gamma-ray unit measuring energy levels of potassium 40, bismuth 214, thallium 208 and total count.
Time constants and full scale ranges are variable and are selected to suit the conditions and background of the survey area.
Depending on requirements of the survey, one or more channels may be recorded on the eight channel recorder.
5 . Alt i met er
The altimeter is a Sperry Radar model. One unit is carried on each wing. The output from the altimeter is recorded on the eight-channel recorder. The recording is l i n e a r ,
G. Camera
The camera used for path recovery is a Hulcher continuous strip 35 millimeter type. It can accommodate 400 feet lengths of film, good for some 250 line miles of survey. It is fitted with a special wide angle lens for low level work.
Fiducial numbers and markers are impressed on t lie film and controlled by the intervalometer.
7. nt ei"val ometer
This is a Geoterrex Model X-l solid state unit which derives triggering from the spectrometer. For a half second sampling interval one fiducial is produced every 5 seconds.
These fiducial marks are impressed on the path recovery f j 1m, the eight-channel recorder, the Hewlett Packard Model 680 recorder and the digital printer in order lo identify and locale geophysical records with ground posilions.
8. Might-Channel Recorder
This recorder is a Gull on Industries Model TR--888. Records are made on heat sensitive paper of l 6 i rich width. Kach channel lias a width of 1.6 inches. Individual signal processors are included for each channel, selected accord ing to requirements for each channel to be recorded.
Normal chart speed is 5.0 inches per minute giving a horizontal scale of approximately 3000 feet per inch.
B. PROCEDURES
] . Photo Laydown s^
Prior to undertaking of the survey, air photos of the area arc obtained from which a photo Jaydown is produced, lo an appropriate scale, usually l" ^ 3320 feet. Proposed lines are drawn on the laydown, with the appropriate direction and line spacing. These "flight-strips" are then used by the air crew for navigating the airp3ane visually along the proposed lines. This phot.o 3aydown is also used to produce the subsequent base maps.
2. Aircraft Operatiori
The air crew consists of pilot, co-pilot (or navigator) and equipment operator. The aircraft is flown along the proposed 3ines at an altitude of some 350 feet, vising the flight strips for navigation. Altitudes in excess of 300 feet are generally considered too high for effeel i ve penetrat ion.
The operator records lines, direction of flight, and starting and finishing fiducial numbers on a flight Dog. Equipment is normally left on during the whole of tlie survey flight, while the intervalometer is turned on only for the actual survey lines. Thus, the appearance of fiducial marks on the charts indicates the extent of the survey l i ne,
3 . Fi e3 d . Keduci ion
Upon completion of the flight, the film d s developed and ihe aciual path of the aircraft is plotted on ihe photo laydown. This is accomplished by comparing ihe fi lin points with ihe photo. For any given point, the appropriate fiducial number is placed on the photo ]aydown and ihe point joined to produce the actual flight pat h .
When field results are desired, anomalies are chosen and assigned appropriate fiducial numbers. The anomalies are then transferred to their correct position on l lie photo laydown.
4. Of fi ce Reduct i on
On the completion of the survey, base maps are drawn using the photo laydown as a base. Flight lines and fiducial numbers a rc shown on this base map.
3n i lie case of KM results the anomalies are then plotted on the'base jnap as boxes with symbols representing anomaly grade or amplitude (as noted on the legend accompanying each map). Anomaly "systems" are then out lined as conductive zones at which stage geological comparisons and interpretation may be made.
In the case of magnetic results, the values noted on the Moseley chart are transcribed to a work sheet (over lay of the base map) after levelling or correcting for heading error, diurnal, etc. The values are then contoured on the work sheet and then drafted on a copy of the base map,
Since base maps use the photo laydown as a base, all geophysical results portrayed may be compared as overlays, and all features of interest may be identified on 1 he appropriate photo for subsequent ground location.
APPEND] X^ B
]978 OTTER FIELD TAPE DESCRIPTION
Tape Density Recording Mode Physical Blocks i/c Logicial Record Length
7 track, 200 B.P ASCII (with even 940 bytes 47 bytes
parity bit)
Individual Record Description
Byte Posit ion(s) within Record Contents
123-78-] 2-1314-1819-2223-2425-2829-3031-3435-3G37-4041-424344-47
carriage return (X'OD')line feed (X'OA 1 )manual input characterssequential counter *blank (X'20')magnet i cstotal counttotal count multiplierpot assiumpotassium multiplieruraniumuranium multiplierthoriumthorium multiplierblank (X'20 1 )radar altimeter
*Fiducials are generated on the analogue records and on the film each time the low order digit of the sequential counter is 0. For example when the counter is at 220, fiducial 22.0 will be generated. At 222, the fiducial value will be 22.2. The next fiducial will bc g enerated when the counter reaches 230.
To convert the recorded digital altimeter units into feet the equcit i on i s :
Feet ^ 5'igitaJI
2.19
no
Ministry of Natural Resources
GEOPHYSICAL - GEOLOGICAL - GEOCHEMICAL TECHNICAL DATA STATEMENT
File___.. ___.
TO BE AriACHED AS AN APPENDIX TO TECHNICAL REPORTFACTS SHOWN HERE NEED NOT KE REPEATED IN REPORT
TECHNICAL REPORT MUST CONTAIN INTERPRETATION, CONCLUSIONS ETC.
Type of Survcy(s). Magnetic; Electromagnetic; Radiometric^
Township or Area, Dorifin Twp. k Greenwich Lake Area ^Claim Holdcr(s). Essex Minerals Company
#1208, 7 King Street East, Toronto
Survey Company. Geoterrex Ltd. ..........^Author of Report. R-K. Dowse, M. Gudjurgis, R.S. Graham^Address of Author. Ottawa, Ontario
Covering Dates of Survey. June 2 fc 3, 1979(linecutting to office)
Total Miles of Line Cut. .... ,.
SPECIAL PRO Y] SIGNS CREDITS REQUESTED
ENTER 40 days (includes line cutting) for first survey.
ENTER 20 days for each additional survey using same grid.
DAYS ,, i - i P" claimGeophysical
Electromagnetic.__ _-
-Magnetometer——-.———.
- - R ad i 01 n et ric. ___.^ __-.
Other. ^ ^.._ ^^
Geological . ^ ___.-—-
Ci co cli cini cal ________
\ 'AIRBORNE CREDITS (Special provision ciedits do not apply to airborne surveys)
'pM a Bnclornctcr -v-^0 —Electromagnetic. 20 —Radiometric. , (enter days pel clajmj -
DATE:. 8-8-79 ... SIGNATURE:; :\ l ' A uthon^l Report or Agent
Res. Geol..
Pjcyious Survey^ File No.
Qualifications/'
Date Claim Holder
MINING CLAIMS TRAVERSED List numerically
See attached schedule
(prefix) (number)
TOTAL CLAIMS__ .69 .^.-.—.—
SEJ.F POTENTIAL
Instrument. ... .. ... .^ .........._ . ^^..., Range..^^..^^...__._......
Survey Method- . . .. . . ..-.........., ...__...^__.-.......^,_____...^,.....,. .^ ..^..__^
Corrections made.
RADIpMETRlC
Instrument^ . . .. . .. ... ,. .................__^ ^_._____...,. .
Values measured. .. ^ ^ ^^^^ ......_
Energy windows (levels). . ^ _ . ........... ........- __...__._._..._...
Height of instrument^ .,^_,. ,.__._Background Count
Size of detector. .. . . .......^.. ...... ,.- ._...- .............
Overburden. . _ ^. ...... ... .......... ,^..(type, depth - include outcrop map)
OTHERS (SEISMIC, DRILL WELL LOGGING ETC.)
Type of survey-
Instrument-,
Accuracy^
Parameters measured.
Additional information (fc)r understanding results).
AJRBORNE SURVEYS
Type of survcy(s) Magnetic, Electromagnetic, Radiometric . ...........-...
Instrument^). Geometries Model G-803 Mag; Goeterrex In-Phase/Out-of-Phase^EM^ 320 Hz;4 (specify for each type of survey) Exploranium DIGRS 3001 Sepctrometer
Accuracy. M a 9 : - 2 gammas; EM: 30 ppm; Spectrometer: -..l.OX.. .. ....^....(specify for each type of survey)
.. ,, , DCH-3 DeHavilland Otter - Registration CR-AYRAncrait used. 3 ..... .. . . .. ... . . ... ... ..l- A 1 50 'Sensor altitude. . . . ... . . . ..... .............. .... . - --..... _ -.....-... -
Navigation and flight path recovery method. Navigation - visual utilizing photo mosaics With
pre-plotted flight lines: Recovery - from continuous 35mm strip photos
Aircraft altitude. 150' _ ____ _ Line Spacing..._J/8 !D].' e . ^. . . ..-
Miles flown over total area. 60 miles ,.,...... Over claims only .-..3.9.'.7.5... m..i|es .. .-, -.
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Dorion Station 'PC.
CANYON A
*
Dorion Landing484814 1494809 1484804
494816 1484807 1484806 .484800484745 I484J740 484827 484826
Goodmorning
Lakes484739 484736 |48473:3
484747 i48 \4738 484737 |4B473
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Macintosh L.
Little Macintosh L.
Block Bay
Lake Superior
^^^ MacKenzie L. )
MCTAVISH TWP. M.ISIZ5aA15SE0ai6 2 .3Q29 DORION 200
TOWNSHIP OF
DORIONDISTRICT OF
THUNDER BAY
THUNDER BAY MINING DIVISION
SCALE 1HNCH*40 CHAINS
LEGEND
PATENTED LANDCROWN LAND SALELEjASESLqCATED LANDLICENSE OF OCCUPATIONMINING RIGHTS ONLYSURFACE RIGHTS ONLYROADSIMPROVED ROADSKING'S HIGHWAYSRAILWAYSPCJWER LINESMARSH OR MUSKEGMINESCANCELLED PATENTED S.R.O.
C.C
NOTES
400 surface rights reservation along the shores of all lakes and rivers.
Land under waters of Lake Superior withdrawn from slaking by Order in Council dated 30th April, 1912 ,
Areas withdrawn from staking under Section 43 of the Mining Act ( R.S.0.1970). Order NO F ile Date Disposition
34662 S R fi M.R.
PLAN NO M. l 70
ONTARIO
MINISTRY OF N ATURAL R ESOURCESSURVEYS AND MAPPING BRANCH
ANDERS LAKE M.2624-O ' 88 045'
48 0 52 30 —
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5453' 52' 51'
50 49 48 47 4688 0 45'
TARTAN LAKE M.2634
487884
AREA OF
GREENWICH LAKE
DISTRICT OF THUNDER BAY
THUNDER BAY MINING DIVISION
SCALE: 1-INCH-40 C HAINS
LEGEND
PATENTED LANDCROWN LAND SALELEASESLOCATED LANDLICENSE OF OCCUPATIONMINING RIGHTS ONLYSURFACE RIGHTS ONLYROADSIMPROVED ROADSKING'S HIGHWAYSRAILWAYSPOWER LINESMARSH OR MUSKEGMINESCANCELLED PATENTED S.R.O.
or
c.s.
Loc.LO.
M.R.O. S.R.O
c.e
NOTES
400' surface rights reservation along the shores of ail lakes and rivers.
Areas withdrawn from staking under Section 43 of the Mining Act { R.s.o. 1970)
DateOrder No. File Disposition
NATIONAL TOPOGRAPHIC SERIES 52 A15
PLAN NO. M. 262ONTARIO
MINISTRY OF NATURAL RESOURCESSURVEYS AND MAPPING BRANCH
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X MI
NERA
LS
COMP
ANY
AIR
BO
RN
E
RA
DIO
ME
TR
IC
SU
RV
EY
52
A1
5S
E0
01
8
2.3
820
DO
RIO
Na
ss
DO
RIO
N
PRO
PER
TYO
NT
AR
IOUR
ANIU
M
CONT
OUR
MAP