Eden Tp. and pts. of Bevin, Caen tps.

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46 0 22'30'
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MARGINAL NOTES
PRELIMINARY GEOLOGICAL MAP No. P.612
and parts of BEVIN and CAEN TOWNSHIPS
/
Mineral Exploration: The Long Lake gold mine in western Eden Township
was ooerated from about 19L1 to 1939 and gold valued at SI,352,164 was
produced (ODM 1940, p. IT].
Patented claims covering the mine area are
currently owned by Copper-Man Mines Limited. There is no record of
other exploration activity in the area.
LOUISE- EDEN AREA
DISTRICT OF SUDBURY
Scale l inch to ^ mile
CENOZOIC
PLEISTOCENE AND RECENT
Sand, gravel, silt, clay
UNCONFORMITY
PRECAMBRIAN
LATE DIABASE INTRUSIONS
8a Diabase, olivine diabase
INTRUSIVE CONTACT
CHIEF LAKE BATHOLITH
Pink leucocratic granite
Porphyritic granite, augen gneiss
Diorite, porphyritic diorite
Id
Pegmatite
INTRUSIVE CONTACT (?1 a
EDEN LAKE
6a
6b
6c
INTRUSIONS
Diorite, trondhjemite
Garnetiferous diorite, trondhjemite
Hornblende gabbro
GABBRO INTRUSIONS 0
5a
5b
5c
Metagabbro, amphibolite
Pyroxene gabbro
Granophyric metagabbro
S*/
s.Gravel
So.
V
Polymictic paraconglomerate, greywacke matrix
Polymictic paraconglomerate, protoquartzite matrix
Laminated argillite, siltstone, greywacke
Riotitic pelite
Muscovite, chlorite pelite
Andalusite pelite
Garnet pelite
So..
/-Y
Geo logical boundary,
observed.
Glacial Striae.
l*/
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So.
53-.
Area of bedrock outcrop.
Geological boundary,
position interpreted.
Bedding, top unknown;
(inclined, vertical).
Fault; (observed,
assumed).
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Several gravel deposits are present in the area and one on the north
shore of Long Lake in Eden Township was being worked during the 1970 fieldseason.
Jointing; (horizontal,
inclined, vertical).
Bedding, top (arrow) from
cross bedding; (inclined,
vertical, overturned).
3
-58;
Quartz veins and stockworks are common in the area between Eden, Luke,
and Long Lakes and it is possible that some contain gold mineralization,
although indicator minerals such as pyrite or arsenopyrite are rare. Several
of the quartz veins are of sufficient size and purity to be quarried for
building stone, but access is difficult.
Small bedrock outcrop.
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References:
Shaft
Gneissosity, (horizontal,
inclined, vertical).
Davis, G.L., Hart, S.R., Aldrich, L.T., Krogh, I.E., and Munizaga, F.,
1967: Geochronology of the Grenville Province in Ontario, Canada; Ann.
Kept, of the Director, 1965-66, Geophysic'al Laboratory, Carnegie
Institution, Washington, p. 383-386.
Vein, vein network.
Width in inches.
Foliation; (horizontal,
inclined, vertical).
Shaft; depth in feet.
y-
METAL AND MINERAL REFERENCE
Au . . . . . . . . . . Gold
q . . .... . . . . Quartz vein
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.quartz.
SOURCES OF INFORMATION
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Geology by K.D. Card, P. Palonen, and K. Siemiatkowska, 1970.
Map 292A, Copper Cliff Sheet, Geol. Surv. Canada.
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Geol. Surv. Canada, Aeromagnetic Map 1517G, Copper Cliff.
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The Grenville Front southwest of Sudbury, Ontario
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Unpublished Ph.D. Thesis, McMaster University.
Base map derived from maps of Forest Resources Inventory, Ontario
Department' of Lands and Forests.
Location of all patented mining claims is approximate.
Magnetic declination approximately 7 O W, 1970.
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Issued 1970.
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PROPERTY
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Lake
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(Long Lake gold mine).
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Wavy
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ODM 1940:
Statistical Review of the Mineral Industry of Ontario for
1939; Ontario Dept. Mines, Vol. 49, pt. 1.
!fOPEN
V
Fairbairn, H.W., Hurley, P.M., Card, K.D., and Knight, C.J., 1969:
Correlation of radiometric ages of Nipissing diabase and Huronian
metasediments with Proterozoic orogenic events in Ontario; Canadian
J. Earth Sci., Vol. 6, p. 489-497.
Lineation with plunge.
Henderson, J.R., 1967:
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3b
A.
Economic Geology: The Long Lake gold mine in western Eden Township
produced $l ) 352,164 worth of gold from 221,070 tons of ore during the
period 1911 to 1939 (ODM 1940, p. 17). Ore occurred in a large block of
metamorphosed sandstone, probably of the Mississagi Formation, included in
Nipissing-type metagabbro and in intrusions of the Eden Lake Intrusion.
The inclusion is bounded on the west by a northeast-trending fault. The ore
consisted of impregnations of gold with minor arsenopyrite and pyrite in the
quartz-veined, sheared metasediment. The main ore shoot was elliptical in
cross-section with its major axis parallel to the fault plane; the fault cut
off the orebody at depth. The deposit was mined by open pit and underground
workings.
GEOLOGICAL AND MINING SYMBOLS
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ODMNA 4657
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The sequence of events in the area can be summarized as follows * '
(\^ deposition of Huronian rocks; (2) intrusion of Nipissing-type gabbros
about 2150 million years ago (Fairbairn et al., 1969); (3) deformation and
metamorphism, possibly during several orogenic events; (4) initial
development of the Grenville Front zone and northeast-trending faults in the
adjacent southern province; (5) intrusion of the Eden Lake Intrusion and
Chief Lake Batholith about 1750 million years ago (Davis et al., 1967);
(6) later deformation and metamorphism along the Grenville Front zone and in
the adjacent Grenville and Southern Provinces.
Age relationships between the Chief Lake Batholith and Eden Lake
Intrusions not definitely established.
Nipissing-or Sudbury-type.
Probably of the Huronian Supergroup. Note that the arrangement of
rock units is lithologic rather than stratigraphic and that order
of arrangement does not indicate relative stratigraphic position.
Copper-Man Mines Ltd.
y/.
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Structural Geology
In the western part of the map-area, the main tectonic
elements.including faults, fold axes, foliations, and lineations, trend
approximately east-west.
In the east, the main tec tonic elements trend
northeast parallel to the Grenville Front. This change in orientation of
regional tectonic elements occurs mainly in a 3 mile wide zone of
northeast-trending faults in the central part of the map-area. The
northeast faults are probably thrusts dipping steeply southeastward on which
the main movement has been reverse dip-slip.
There is evidence that they
were active both before and after emplacement of the Eden Lake and Chief
Lake intrusions.
Brecc ia
1.
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area
CONGLOMERATE
PELITE
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Late, northwest-trending diabase dikes intrude all other rocks in the
SANDSTONE
3a Feldspathic sands tone, arkose
3b Subgreywacke, greywacke
3c CVrthnqiiartzi te
2a
2b
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CALCAREOUS METASEDIMENTS
4a Limestone, marble
4b Calcareous argillite, siltstone
Ac Amphibolite
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So,
The Chief Lake Batholith, a composite intrusion consisting of
equigranular and porphyritic quartz monzonite, quartz diorite, pegmatite,
and aplite, underlies much of the eastern part of the area. Evidence for
the intrusive, magmatic nature of the Chief Lake Batholith includes
crosscutting dikes, stoped inclusions of Huronian metasediments and
Nipissing-type metagabbro, and agmatitic and migmatitic contact aureoles.
METASEDIMENTS C
R 247
r 55 X"
A number of sills, dikes, and small plutons, herein termed "Eden Lake
Intrusion", intrude the older rocks in the western part of the area. These
range in composition from trondhjemite, through diorite, to gabbro,
INTRUSIVE CONTACT
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Metamorphosed, Nipissing-type gabbros intrude the Huronian sedimentary
rocks, and are in turn intruded by the Eden Lake Intrusion and Chief Lake
Batholith.
INTRUSIVE CONTACT
CD
//
Isolated blocks of thinly-bedded, metamorphosed (under greenschist
and lower almandine amphibolite facies conditions of regional metamorphism)
siltstone, argillite, and micaceous sandstone occur in the Eden Lake
Intrusion in the western part of the area. They are tentatively correlated
with the Pecors Formation of the Huronian Supergroup. Overlying the Pecors
and occunying much of the western half of the area, is a thick sandstone
unit correlated with the Mississagi Formation, This formation contains
cyclic repetitions of sequences varying from thin-bedded subgreywacke at
the base to very thick-bedded feldspathic quartzite at the top. The lower
beds of a cycle commonly contain planar sets of crossbeds while the upper
beds are dominantly festoon crossbedded.
In the northern part of the area,
polymictic paraconglomerate tentatively correlated with the Bruce Formation
conformably overlies the Mississagi sandstones.
It is succeeded by
approximately 400 feet of thin-bedded, metamorphosed calcareous siltstone,
limestone, and sandstone of the Espanola (?^ Formation, and by about 600
feet of sands tone and siltstone of the Serpent (?) Formation. Metamorphosed
greywacke, siltstone, and minor polymictic paraconglomerate north of Wavy
Lake in eastern Eden Township are tentatively correlated with the Gowganda
Formation. Feldspathic sandstone and orthoquartzite, which occur mainly as
isolated inclusions in the Chief Lake Batholith in the eastern part of the
ma p-area, are correlated with the Lorrain Formation.
In addition to the
foregoing metasedimentary units for which tentative correlations can be
made, there are numerous isolated inclusions ranging in size from a few
feet to many thousands of feet in the Eden Lake Intrusion and Chief Lake
Batholith which cannot be correlated, although they probably belong to the
Huronian Supergroup.
LEGEND
7c
WATERS
General Geology: The map-area is located in the Southern Province of the
Canadian Shield, immediately north of the Grenville Front, thp. yon p of
contact between the Southern and Grenville Provinces. The rocks are all
of Middle Precambrian age, and include metasediments of the Huronian
Sunergroup Nipissing-type metagabbro intrusions, granitic, dioritic, and
gabbroic intrusions of the Eden Lake Intrusion, granitic intrusions of the
Chief Lake Batholith, and late diabase dikes. Bedrock is partly covered
by unconsolidated sand, gravel, and c lay deposits of Cenozoic age.
NTS Reference: 41 1/6
GSC Aeromagnetic Map:
1517G
ODM Preliminary Map: P. 105
7b
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Location: Eden Township and the northern parts of Bevin and Caen Townships,
an area of about 35 square miles bounded by latitude 46 O 15 ' and boundaries
of the townships, are located about 14 miles southwest of Sudbury, Ontario.
Access to the area is provided by Highway 543 extending south from
Highway 69 at Sudbury, and by gravel roads around Long Lake and Wavy Lake.
EDEN TOWNSHIP
7a
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ONTARIO DEPARTMENT OF MINES AND NORTHERN AFFAIRS
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