REPORT ON A LINECUTTING AND GEOPHYSICAL PROGRAM
POTTER MINE PROPERTY
FOR THE HARRISON GROUP OF COMPANIES
By: Raymond L. Lashbrook
April 25, 1996
TABLE OF CONTENTS
PROPERTY LOCATION MAP 1(a)
GENERAL GEOLOGY 1
GEOPHYSICAL SURVEYS 2
MAGNETOMETER SURVEY 2
VLF - ELECTROMAGNETIC SURVEY 3
BACK POCKET - MAGNETOMETER VALUES MAPS EAST AND WEST
MAGNETOMETER CONTOUR MAPS EAST AND WEST
VLF- ELECTROMAGNETIC MAPS VALUES AND PROFILES EAST AND WEST
VLF FRASER FILTER MAPS EAST AND WEST
Lashex Ltd. was contracted to conduct linecutting,
magnetometer and vlf-electromagnetic surveys over claims in the Potter
Mine Area. A total of 70 kilometers of linecutting and 60 kilometers of
geophysics was performed.
This report covers the program and given conclusions
The property is located in the Township of Munro,
N.T.S. 42-A/9 and is approximately 24 kilometers east of the town of Matheson
then northerly on a bush road to the former minesite.
Geologically the property is situated in the Abitibi
Subprovince of the Superior Province and is underlain by volcanic rocks
of from ultramafic to felsic composition of about 2710 million years old.
Intruded into and in part contemporaneous, are peridotite to serpentenite
sills and dykes. To the south side of the property a syenite is intruded
and is in a faulted contact with the mafic to ultramafic rocks. A southwesterly
striking quartz diabase dyke cuts through the western half of the property
and appears to be offset about 400 to 500 meters.
At the mine site the ore is located in and at the
top of a rhyolite lapilli tuff which is overlain in part by a cherty tuff.
Overlying this is a peridotite sill or thick ultramafic flows.
Mineralization at the mine site consisted of semi-massive
to massive sulfide tenses composed of various proportions of pyrrhotite,
chalcopyrite, sphalerite, pyrite and galena. These lenses, up to 30 feet
thick and 400 feet long, are situated at the top of the rhyolite lapilli
tuff. The ore and felsic units have a northerly dip and plunge steeply
Approximately 0.5 million tons was previously mined.
The lowest level bottomed in ore at 1200 feet. The shaft extends down to
An east-west baseline was established along the north
boundary of the east claims and zeroed at the east corner. The baseline
was then cut to 3600 meters west with crosslines established every 75 meters.
Stations were located every 25 meters along the crosslines. Tie-lines were
cut along the north and south boundaries of the property. A total of 70
kilometers of baseline, tie-lines and crosslines were cut.
A combined total field magnetometer/vlf-electromagnetic
survey was conducted over the property for a total of 60 kilometers. Magnetometer
readings were taken every 12.5 meters along the lines. A base station recorder,
reading every 20 seconds, was used to correct the data.
The vlf-electromagnetic survey was conducted using
Cutler, Maine with a frequency of 24.0 kHz. As a transmitter station. Readings
were taken every 25 meters along the lines.
The magnetic survey defined a general east-west strike
to the underlying rock units through the central portion of the property,
a northwesterly trending strike for the southeast part, and a contorted
south to southwesterly strike to the west central area. The property consists
of several distinct anomalies that are discussed below.
Anomaly ‘A’ - This anomaly is located
between lines 450W to 1200W and from 800S to 1100S. This anomaly is actually
a series of high and low values. The area appears to be underlain by ultramafic
intrusives consisting of pyroxenites and peridotites and possibly some
komatiitic flows. Disseminated magnetite within these units are the probable
cause of this anomaly.
Anomaly ‘B; - This is the Minesite
Anomaly extending from L850W to 1850W. Further east several one line magnetic
highs from 300W to 600W may be the extension of this zone.
This anomaly is probably caused from peridotite which
was located in the underground workings and forms the hanging wall to the
Anomaly ‘C’ - This anomaly extends
northwesterly from 1500W to 2000W and from 500-700S on L1500W to 300-350S
on L2000W. This anomaly is very similar to anomaly ‘B; and is probable
that it is caused from a peridotite.
Anomaly ‘D’ - This anomaly is located
between 450-675N on L1200W to 500-800N on L1950W. The magnetics are very
strong with one reading exceeding 70,000 gammas on L1650W at 587.5N. An
ultramafic serpentenite intrusion is the probable cause of this magnetic
Anomaly ‘E’ - This anomaly is located
from 350-550N on L2400W to 200-275N on L2775W. A possible faulted extension
runs south to southwesterly from L2625W to L3150W, 800S.
Previous mapping has shown that a quartz diabase
dyke extends through this area and is the probable cause of this anomaly.
Other low magnetic anomalies appear to be formational
and are due to a slight increase in the magnetite content of the mafic
Several vlf conductors were located by the survey,
most of which are flanking the magnetic anomalies.
Conductor ‘A’ - This is a very strong
conductor that extends southeast from L1200W, 750S to L450W, 1175S. The
conductor crosses several magnetic anomalies and in part flanks the high
values. A probable fault appears to offset the conductor.
It is probable that this conductor is caused by sulfide
Conductor ‘B’ - This set of strong
conductors extends from L’0’ to L2050W. For the most part they flank the
magnetic highs caused from the peridotites. Near the minesite it passes
very near the known massive sulfide horizon. It is probable that the cause
of these conductors is the sulfide horizon located at the top of the felsic
lapilli tuff and below the peridotite.
Conductor ‘C’ - These set of conductors
are located outside of and to the north of the mine area. They appear to
be formational and have little magnetic response. It is probable that these
conductors are caused from disseminated sulfides along certain horizons
(tuffs, graphitic tuffs, interflow tuffs and sediments) within the volcanic
Conductor ‘D’ - This conductor located
in the south central part of the property trends northwesterly and is located
near the site of a known mapped fault - the ‘Centre Hill Fault’.
The conductor consists of two parts separated by the property boundaries.
It is probable that this conductor is caused from the fault and possibly
in part due to sulfides within the fault.
Conductor ‘E’ - This series of east-west
trending conductors are located in the northern portion of the property.
The area is underlain by ultramafic intrusions. The cause of these conductors
may be due in part to serpentinization of the ultramafic and in part to
disseminated sulfides. In some locations the conductors are very strong
which may indicate sulfides.
Conductor ‘F’ - This series of conductors
are located in the southwest part of the property from L2625W to L3075W
and between 300S and 400S. They may be the western extension of Conductor
‘B’. They are moderately strong and may be caused by sulfide mineralization.
Conductor ‘G’ - These series of conductors
are located in the northwestern part of the property and appear to be flanking
some weak magnetic anomalies. The cause of these conductors may be due
to disseminated sulfides within the volcanic rock units similar to Conductor
The magnetometer/vlf-electromagnetic surveys were
successful in locating anomalous zones that will require further work to
fully explain their causes.
The conductors that flank the magnetic anomalies
east and west of the mine appear to be in the same geological horizon that
the orebody is located and as such may indicate
that the potential to encounter more volcanogenic
massive sulfides is extremely high.
Given the fact that the Potter Mine still had reserves
along strike and to depth and that massive sulphide lenses and orebodies
usually occur in clusters further indicates the high potential of this
property. The strong conductors outside of the mine area and located in
ultramafic intrusive to extrusive rocks have good potential to host nickel-copper-cobalt
Other conductors should also be tested as to their
gold potential. These are the conductors that appear to be formational
and the conductor that follows the Centre Hill Fault.
Given the excellent results of the geophysical surveys
and the fact that the property hosts known massive sulfide deposits the
following programs are recommended:
The property should be prospected and mapped in detail
with particular attention paid to explaining the magnetometer anomalies
and vlf conductors.
A soil geochemistry ‘B’ horizon survey should be conducted
over conductors that are away from the minesite influence and that cannot
be explained by surface prospecting. Assays should be performed for Cu,
Zn, Pb, Au, Ag, Co, and Ni.
Regardless of the results of the above program it is
recommended that at least 3,000 meters of diamond drilling should take
place. The numerous conductors and down dip extension to the known orebody
requires diamond drilling to test their potential.
The above program will cost approximately $350,000.00
to fully carry out.
The following is recommended as a follow-up to Phase
It is recommended that at least 10,000 meters of diamond
drilling should be undertaken to test the more favourable results of the
above program and to test any remaining drill targets.
This program will require approximately $900,000.00
I, Raymond Lashbrook do hereby declare that
I have no interest in this property nor do
I expect any
I graduated from Haileybury School of Mines in 1969
and I have been practising my profession ever since.
I own a company called Lashex Ltd. which performed the
work on this property.
I reside at 973 Pinecreek Road, R.R. #1, Callander,
Ontario, P0H 1H0.
Raymond L. Lashbrook
April 25, 1996