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MARGINAL NOTES
INTRODUCTION: The Benny area, located some fe4 km (40 miles)
northwest of Sudbury Ontario, is bounded by Latitudes 46 O4Z'N
and 46 U 51'N and Longitudes 81 O26'W and 81 O 55'W. This area, of
about 420 sq. km (240 square miles) including the townships
of Craig, Moncrieff, and Hess and parts of the townships of
Gilbert, Stralak, Ulster, Munster, Leirnster, Ouellette, Solski,
Tofflemire, Hart, and Cartier, was mapped during the 19 73 and 1974
fiPId seasons at a scale of l inch to ^ mile. Parts of the map-
area were previously mapped by Quirke (1920), Osborne (1929),
and Ho] me s (l 953) . The Le ins ter-Bow t; 11 area to the east was
mapped by Card and Meyn (l969) and the Onaping nap-area to the
north was mapped hy Collins (1917).
MINERAL EXPLORATION: Exploration for base metals, iron, gold,
and uranium has been carried out at a nunber of locali ties
within the rrap-area. In the early 1940s, some 10,400,00O pounds
of zinc. 3,600,000 pounds of lead, and silver valued at $28,4lb
were produced from the Lake Geneva Mine in Hess Township. When
the mine closed in 1944, approximately l SO,O00 tons ot ore grade
material (approxi mately 9 percent zinc and 3 percent lead) were
left (S.L. MacDonald, May 1951, Resident Geologist's File,
Minibtry of Natural Resources, Sudbury). Several companies,
including the current owners, Geneva Metals Incorporated, have
attempted to outline aridi tional reserves from 1944 to present.
[tier o are numerous strat abound sulphide d epos i t s in the Early
Precambrian metavolcanic-metasedimentary sequence. Several have
been tested by trenching, drilling, and geophysical methods. The
dominant sulphide minerals are pyri t e and pyrrhotite, but the
Stralak occurrences in Craig Township contain appreciable amounts
of zinc, lead, and copper sulphide mineralization.
Keplacemert-type deposits consisting of variable proportions
and eombinations of magnetite, chalcopyrite and sphaleri t e occur
in the Huronian sequence, parti cularly in calcareous rocks of
the Espanola Formation, in southwestern Hess Township, south-
central Munster 'lowr.ship, and northern Hart Township. Magnetite
ve1 Lns also occur in Early Precambrian granitic rocks in central
Hess Township.
In east-central Hess Township, a rrcfic dike containing
copper-nickel sulphide mineralization has been tested by pitting
and drilling. This dike apparently represents the extension of
the Foy Offset, a dike-like offshoot from the Sudbury Ni eke l
Irruptive (Card and Innes 19 73}.
GENERAL GEOLOGY: The map-area is located in the southern part
of the Superior Province a short distance north of the Sudbury
Nickel Irruptive. This terrain has been affected by both Early
and Middle Precambrian depositional and* deformational events.
The major rock groups include Early Precambrian metavolcanics
and related metasediments, Early Precambrian mafi c and felsic
intrusions of several ages, and Kiddle Precambrian metasediments
of the Huronian Supergroup. Middle Precambrian Nipissing Diabase
and Late Precambrian diabase dikes are prevalent. Breccia
bodies uf several types and ages are present.
The Early Precambrian me tavol can i cs, and rue ta sediment s of
the Benny Belt form an cast-trending belt up to 3 km (2^ miles)
i n outcrop width that extends through and beyond the boundaries
ol t IIP ma p-area. The sequence, which is bordered by intrusive
K;i riv Precambrian granitic and migma t i tic rocks , dips steeply
southward for the rr.ost part and has a maximum preserved thickness
of at least 3,000 m (10,000 feet). The western one-third of the
belt consists mainly (70 percent) of massive and pillowed nafic
flows wi th lesser amounts of intercalated pyrocl as tic rocks (lithic, lapilli-tuff, tuff-breccia) and tuffaceous mttasediments
in the southern part of the belt. In addition there are several
sill-like gneissic metagabbro intrusions in the western part of
the belt.
The central part of the belt consi sts of intercalat ed mafic
flows and pyroclastic rocks (30 percent), intermediate tuff and
tuff-breccia with some volcanogenic netasedinents (50 percent), and
felsic pyroclastic rocks and flows (20 percent). The netasedi-
ments include tuffaceous greywacke and siltstone, some recrystal-
11zed chert, one unit of oxide-facies iron formation, a quart z-
feldspar sandstone unit, and several graphitic siltstone units.
There are a number of cyclic repetitions of mafic, internediate,
and felsic metavolcanics commonly with sulphide-bearing tuffs
and tuffaceous metasediments forming the contact zones between
malic and intermediate or felsic rnetavoleanic units. The sulphide
mineralization, mainly pyrrhotite and pyri te but also sphalerite,
galena, and chalcopyrite locally, forms stratiform disseminations,
massive lenses, and veins.
In the eastern third oi the Renny Belt, there are cycli c
repetitions of mafic, intermediate, and felsic metavolcanics
and associated sulphide-bearing metasediments and tuffs in the
north, 'lhe southern part of the belt in this area consists
mainly of tuf f-brecc ia.-
The rocks of the Benny Belt have been regionally metamorphosed
under condi tions ranging from the lower greenschist facies in the
central part of the belt to amphibolite facies in the nargi nal
parts.
The felsic plutonic rocks that surround and intrude the
metavolcanics can be divided into two main groups: an older
gneissic, granodioritic-migrnatitic complex that occurs mainly
to the north of the metavolcanic belt; and younger, relatively
massive, homogeneous quartz monzonite that forns most of the
terrain to the south. Numerous xenoli ths and sehlieren of mafic
to i n termed i ate orthogiieiss and paragneiss occur in the felsic
plutonic rocks. Tn the eastern and western parts of the map-area
to the north of the Benny Belt there are extensive areas of
m i gnat i tic rocks consisting of variable proportions of meta-
volcanics , metasediments, felsic intrusi ve material, and
porphyritic granod iori te, diorite, and gabbro bodies. The
younger fei sic plutons consist mainly of leucocratic, porphyritic
quartz monzonite.
Early Precambrian mafic intrusions of several ages are present:
si 11-like metagabbro intrusions and a few small metagabbro dikes
that, like the netavolcanics in which they occur, are foliated;
and T.assive equigranular and porphyri ti c mafic dikes that form
ramifying swarms in the Early Precambrian metavolcari c and
graniti c rocks.
Middle Precambrian Huronian metasediments form a discontinuous.,
erratically distri buted cover unconformably overlying the Early
Precambrian basement. These rocks belong to the Mississagi, Bruce,
Espanola, Serpent, Gowganda, and Lorrain Formations and represent
mainly coarse clastic accumulations deposited on an irregular
erosion surface developed on the basement terrain. The Espanola
Format!on, which unconfornably overlies basement at several
localities, is up to 120 m (400 feet) thick, and consists of a
lower sequence of relatively pure, thin-bedded dolostone and
limestone, and an upper sequence of siltstone. The Serpent
Formation, consisting mainly of coarsc-gra ined, conglomeratic
feldspathic sandstone, is locally up to 300 m (l,000 feet) thick
but in general is much thinner and is locally absent. The
Gowganda Forrration, which is also commonly unconformable on base
ment , is up to 900 m (3,00 O feet) thick and cons i K t. s of a lower
sequence of stratified conglomerate, sandstone, and siltstone, and
ar upper sequence of interbedded siltstone and sandstone. The
Lorrain Formation, some 300 to 450 n (1,000 to 1,500 feet) thick,
is comprised of thick-bedded, coarse-grained, pebbly sandstone
coloured in various shades of green, pink, buff and white with
lpnses of well-sorted quartz pebble conglomerate.
The Huronian rocks have suffered only low rank (low green
schist facies) regional metamorphism. Depositional features and
structures, such as the Huronian-basement unconformity, ripples,
cross stratification, and ball-and-pillow structures are well
preserved. A tew scattered paleocurrent determinations indicate
that the depositional currents flowed south to southwest.
Nipissing Diabase intrusions., consisting of pyroxene and
hornblende gabbro and metagabbro, intrude all the foregoing rock
units, especially the Huronian rocks with which they appear to be
spatially related. Mafic intrusions of the Nipissing type are
notably rare in areas in which Huronian rocks are absent.
A mafic dike (quartz gabbro or diorite) in Hess Township
which was described previously by Card and Innes (1973) and
tentatively cons idered to be part of the Foy Offset of the
Sudbury Nickel Irruptive, was traced eastward into Harty Township
to a point near the Onaping River.
Breccias, both of the Sudbury or pseudotachylite-type, and
others containing mafic rock fragments in a matrix rich in biotite
and magnetite, are present throughout the area. A few small
lamprophyre dikes were noted. The youngest rocks in the area,
diabase dikes, form part of a regional northwest-trending dike
swarn.
The bedrock is extensively mantled by boulder till, moraine,
valley train outwash, and esker deposits, the products of Pleisto
cene glacial and glaciofluvial processes. Large glacial erratics
and boulder trains are present. Glacial striae on bedrock trend
S10W to S20W. - '
STRUCTURAL GEOLOGY: Primary stratification in the Early Precambrian
metavolcanic sequence strikes east and dips steeply southward for
the most part. Although minor folds are present; no major folds
repetitions were discerned. The dominant tectonic foliation,
a regional penetrative cleavage or schistosity, is subparallel Lo
primary stratification and is associated with flattening and
alignment of pillows, lithic fragments, and minerals. These
elements are shortened in the north-south direction normal to
the foliation plane, and elongated east-west; down-dip elongation
in the foliation plare gives rise to a rodding lineation. Deformed
pillows and lithic fragments have the form of triaxial ellipsoids
with axial ratios on the order of 1:10:15. Foliation In the
felsic plutonic rocks, in the form of penetrative cataclastic
cleavage and gneissosity, strikes generally east and dips steeply
both north and south.
The Huronian supracrustal rocks have been tectonieally
deformed but the intensity of - this deformation, along with
the orientation of fold structures, is highly variable from
place to place. Middle Precambrian deformation was apparently
dominated by vertical movements on fault-bounded basement blocks
and consequent paSK i ve deformation of the Middle Precambrian
cover.
Fault sets striking northwest, northeast, north-northwest
anc east-northeast are present. Movements on major northwest
and north-northwest faults such as those along the Spanish
River, Kennedy Lake, and the Agnes River have resulted in
progressive northward displacements of thp Benny Belt from east to west.
ECONOMIC GEOLOGY:
Lead-Zi nc-Silver: The Lake Geneva Mine (3) in Hess Township
was discovered in 1924 and produced some 80,588 tons of ore
grading 9.21 percent Zn and 3.34 percent Pb with 22 ounces
per ton Ag in the lead concentrate during the period 1941 to
1944 when the mine was owned and operated by Lake Geneva Mining
Company Limited (Hawley 1948). The mineralization, mainly
sphaleri te and galena with pyri te and minor amounts of pyrrho
tite and chalcopyrite, occurred in an irregular tabular body
some 200 n (700 feet) in length, 0.7 to 3 m (2 feet to 9 feet)
in width, and extended to a depth of about 300 m (l.000 feet).
The gangue minerals include quartz, feldspar, carbonate, hi oti te,
hornblende, diopside, and garnet. The mineralization is mainly
massive, but l ocally displays fine interlayering of sulphide
and gangue ninerals. A grab sample of mineralized. well-bedded
felsic tuff taken by the writers yielded the following upon
assay by the Mineral Research Branch, Ministry of Natural
Resources: , . . , ^
Zinc
10.3 1.05
Copper "L
0.08
Gold oz,
1.25
The mineralized zone occurs in Early Precarrbrian felsic and
mafic pyroclastic rocks and metasediment s that are intruded
by numerous granitic and gabbroic dikes. The mineralized zone
strikes northwest and dips 45 O to 60O south, conformable with
the stratification in the country rocks.' There are numerous
Sudbiiry-type breccia bodies in the area consisting of country
rock fragments in a crush matrix. The Lake Geneva deposit could
be of volcanic exhalative origin or could represent a hydrothermal
replacement deposit associated with mafic or felsic intrusions.
The Stralak zine-1cad occurrences (l 5, 16) in northeastern
flraig Township consist of stratabound sulphide mineralization along
a mafic metavolcanic-felsic metavolcanic contact extending westward
from the Canadian Pacific railway at Stralak. 'Two zones of sul
phide mineralization occur along this contact: an eastern zone
about 500 n (1,500 feet) long and 3 m (10 feet) wide with ;iiassivc
sulphide lenses up to 2 m (6 feet) thick; and a western zone about
1.6 km (l mile) to the west which is 200 m (600 feet) longhand up
to 2 m (6 feet) wide. The disseminated sulphide mineralization,
mainly pyrite and pyrrhotite with minor chalcopyrite and sphalerite,
occur in foliated, micaceous and chloritic tuffaceous rocks and
siliceous metasedinents. The massive sulphide lenses consist of
pyrite and sphalerite with lesser amounts of galena and chalco
pyrite. The sulphide mineralization, like its host rocks, is
strongly foliated and lineated.
Exploration work consisting of surface trenching, diamond
drilling (not shown on map), and geological and geophysical surveys,
mainly by Preston East Dairaa Mines Limited in 1952 and by Mining
Corporation of Canada (1964) Limited in 1964-65, has outlined
some 363.680 tons of material grading 3.18 percent Zn, 0.32
percent Cu } and 0.68 oz Ag/ton over an average width of 2.6 m
(8.6 feet) to a depth of 48 ir. (157 feet) (Resident Geologist's
Files , Ontario Mini stry of Natural Resources, Sudbury). The
Stralak occurrence occurs near the northern margin of the Benny
Belt at approximately the same stratigraphic level as the Lake
Geneva Mine.
Assays, by Lhe Mineral Research Branch, of mineralized grab
samples taken by the writers from the Stralak East (16), Stralak
West (15) , and Straight Lake (17) occurrences are as follows:
Sa mpj-g
Stralak jast
BI-74-13 EC-74-50 EC- 74-51 BC- 74-49
4.59
6.651.35
Lead
0.17
0.53 Trace
Copper 7o Silver oz
0. 13
0.841.65
0.50 0.80 l .12 1.32
Trace Trace Trace
Stralak West (15)
BB-74--50
BC-74-1055.56
10.40.9:3 0.5&
BC- 74- 2 l
Trace0.39
Trace
2.22
0.12 Trac
Other Sulphide Deposits in Melavolcanics (6,7,8,11,12,13,14,19,
20): __________________________________________________
There are numerous other stratabound sulphide deposits, consisting
mainly of pyri te and pyrrhotite, with minor sphalerite and chal
copyrite in some occurrences, at mafic metavolcanic-felsic meta-
volcanic contacts throughout the area. There is a prominent zone
of such sulphide-bearing units in the southern part of the belt
that extends from central Moncrieff Township through Craig Township
to the northeastern corner of Ouellette Township (formerly Township
115). individual zones with disseminated sulphide mineralization
arc up to 30 m (lOO feet) thick and within these zones there are
lenses of massive pyrite and pyrrhotite up to 1.5 m (5 feet) thick.
in western Moncrieff Township (12) and northwestern Craig Township
(.20) sulphide mineralization is associated with graphitic
metascdi rr.ents .
jiasc^Metal Deposits inj-luronian Rocks: A zinc-lcad-copper-silver
occurrence (9) was located during the present mapping in central
Hess Township in carbonate rocks of the Espanola Formation which
unconiormably overlie granitic basement rocks. Mineralization
consists of replacement pods, veins, and disseminations of galena,
sphalerite, pyrite, and chalcopyrite in recrystallized, silicified
dolomite. The main zone of mineralization, averaging abovit 25
percent sulphide minerals, is exposed over a width of approximately
4.5 m (15 feet) but is exposed for only a short distance east-west
along strike of the Espanola Formation on the northern shore of
a large, dry marsh. To the south, there is a drift-covered interval
of about 9 m (30 feet), followed by an "island" exposure of
recrystallized dolomite with disseminated pyrite, chalcopyrite,
galena and sphalerite (up to 10 percent) over an outcrop width of
sor.ie 9 m (30 feet). At the southeastern end ot" the island steeply
dipping, east-striking, thin-bedded Espanola dolomite unconformably
overlies deformed granitic basement rocks. lo the north of the
nain zone,' minor amounts (l percent to 5 perccrt) of disseminated
sulphide minerals are present in recrystallized dolomite over an
outcrop width of about 21 m (70 feet). The dolonite is succeeded
by thin-bedded black calcareous siltstone of the upper Espanola
Formation. Some 180 m (600 feet) to the east, minor disseminated
sulphide mineralization, mainly pyrite and galena, is present in an
exposure of Espanola dolomite. To the west, the strike of the
formation changes abruptly from east to south and approximately
300 m (1,000 feet) southwest of the main occurrence, recrystallized
Espanola dolonite with ninor amounts (l percent to 5 percent) ot
disseminated galena and pyrite is again exposed. Assays, by the
Mineral Research Branch, of nineralizcd samples taken by the writers
from this deposit are as follows:Copper Silver Ooid
Zinc 'L Lead "L "f. oz. oz.
0.97
Nil
0.33 0.08
0.18 0.07
0.58
i.60 Trace
Trace Nil
Trace Trace
0.08 Trace Nil
0.01 Trace Nil
0.02 Trace Nil
0.04 0.11 Nil
Chip sample north-south across 4.5 m (15 feet) of main mineralized zone
Two grab samples of massive dolomite taken north of main zone with minor disseminated galena and chalcopyrite
Grab sample or recry stallized dolomite with minor disseminated pyrite, galena, and c hal c o py r i t e from north side of "island' outcrop
Three grab s arr.pl e s of re- crystallized dolomite with minor disseminated pyri te, sphalerite, galena and chalcopyrite from the southwestern occurrence
In northern Hart Township a replacement-type deposit (.21)
containing zinc, with minor copper, lead,-cobalt, and ni ckrl .
occurs in Huronian metasediments. in Lots 7 and 8, Concession V
Hart Township, brecciated, contact metamorphosed rocks of the
Espanola and Serpent Formations contain veins, disseminations,
and pods of mineralization erratically distributed in a zone
approximately 300 rr (1,000 feet) in length near the contact
a IS^pissirig Diabase intrusion. The minerals present include
magnetite, pyrite, sphalerite, g" IeTia ' chalcopyrite, cobaltite,
and smalt-1 te. Gangue minerals in the carbonate-rich Espanola
Formation rocks include, diopside, wo lias t on itc, and pectolite.
Quartz-carbonate veins in ^he Nipissing Diabase near the contact
contain pyrite, chalcopyrite, cobaltite, diops ide, and tremolite
Exploration, including surface trenchi ng, diamond drilling (not
shown on map), and a geophysical survey, mainly by Mogul Mining
Corporation Limited in 1955 and by Sale.n Exploration Limited in
1965, has outlined several zones of mineralization up to 1.4 r.
(4-^ feet) thick containing 1.46 percent to 8.06 percent ^n,
O.ll percent to 1.30 percent Pb, 0.03 percent to 0.12 percent
Cu, and 0.02 percent Co. (Resident Geologist's Files. Ontario
Ministry of Xatural Resources, Sudbury).
Ir ori: A magnetite occurrence (5) located in central Munster
Township about 0.8 km ( L2 mile) north of the southern boundary
of the township has been tested in the past, mainly by B and M
Explorations Limited in the 1950s by a number of shallow pits,
an adit, geophysical surveys, and limited diamond drilling (not
shown on map), (Resident Geologist's Files, Ontario Ministry of
Natural Resources. Sudbury). The deposit is a replacement-typp
deposit formed at the contact of a mafic intrusion with Huronian
metasediments. The country rocks consist ot thin-bedded (0.5 to
2.5 cm; -i to l inch), fine-grained, greenish grey sandstone
tentatively correlated with the Gowganda Formation, Fragments
of Espanola-type limestone occur in one of the dumps. The meta
sediments are intensely silicified, chloritized, and brecciated
and are cut by numerous magnetite- and hematite-bearing quartz
veins. A highly altered chloritic mafic dike intrudes the meta
sediments and the main pod-like concentrations of crystalline
magnetite, with abundant pyrite locally, occur along the contact
both in the dike and in the metasediments. Two zones of mag
netite mineralization are indicated by a magnetometer survey:
a western body measuring 18 by 100 m (60 feet by 340 feet) and
an eastern body measuring 36 by 42 m (120 feet by 140 feet).
Drilling intersected up to 26 m (86 feet) (core length) of iron
mineralization with assays ranging from 15 percent to 45 percent
Fe over core lengths ranging from 1.5 m (5 feet) to 2.5 m (8.5
feet) (Resident Geologist's Files, Ontario Ministry of Natural
Resources, Sudbury). Approximately 0.8 km ('2 mile) north of
the main occurrence, thin-bedded, brecciated metasediments with
magnetite-bearing quartz veins are exposed on the western sidp
of an old road. On the eastern side of the road, an altered
mafic dike, possibly the extension of the dike described pre
viously, intrudes the metasediments and contains disseminations
and pods of magnetite. Analyses by the Mineral Research Branch
of two grab samples taker, by the writers from the train occurrence
are as follows:
Iron \
52.57.68
Zinc "i
0.14 Trace
Lead "A Copper oz. ) Jive r
A magnetite occurrence (4) at the southwestern end of Hess
Lake, Hess Township has been explored by Jay bee Landry F.xploration
and Mining Company Limited in 1966 by pi 11 ing, trenching, linited
diamond drilling (not shown on map) and a nagnetomcter survey
(Resident Geologist' s Files, Ontario Mini s try of Natural Resources,
Sudbury). This work outlines a magnetite deposit, with dissemin
ated chalcopyrite locally, some 7.6 n (12:0 feet) wide and 180 m
(600 feet) long trending northeast. Assayed drill core sections
are mainly in the range 31 percent to 57 percent Fe and trace to
0.65 percent Cu (Resident Geologist's Files, Ontario Ministry of
Natural Resources. Sudbury). Analyses by the Mineral Research
Branch of grab samples taken during the present survey to test for
tht presence of base metals are as follows:
Zinc \ Lead ̂ Copper "L Silver oz. Coldoz.Iron
5.42Nil
0.130.50
0.9fi 0.12
Trace 0.18
Trace Trace
The mineral i nation apparently represents a replacement in an
isolated occurrence of sandy limestone and siltstone of the
Espanola Formation which is in unconformable and fault contact
with the basement granitic rock and is cut by mafic intrusions.
The deposit occurs at the northeastern end of an aeromagnetic
anomaly which extends roughly southwestwards some 8 km {5 miles}
through an area of heavy overburden (CSC 1965). This deposit
deserves further exploration to determine its extent and to
assess its potential for copper and other base metals.
Magnet ite veins are also present in Huronian rocks in
northeastern Harty Township and in Early Precambrian granii
rocks in central Hess Township (lO).
A grab sample taken from the small F.arly Precambrian iron
formation lens in Craig Township (18) yielded 36.2 percent iron
upon assay by t hP Mineral Research Branch.
N i eke 1.- C o p pe r: A mafic dike containing nickel-copper sulphide
mineralization (l) is exposed at several localities in east-
central Hess Township where it intrudes altered, brecciated.
silicified granitic rocks. This intrusion is probably part of
the Foy Offset, a dike extending northwest and west through
Foy Township from the Sudbury Nickel Irruptive. The minerali
zation was tested by Canadian Nickel Company in 1966-67, who
carried out some 2,700 m (9,000 feet) of diamond drilling (not
shown on map) on 9 claims (Resident Geologist's .Files, Ontario
Ministry of Natural Resources, Sudbury). The dike trends we-st-
southwest, is apparently vertical, and is about 15 to 30 m (5.0
to 100 feet) wide.
Sulphide minerals including pyrrhoti te, chalcopyrite,
and pentlandite occur as disseminations (generally less than
10 percent but locally up to 30 percent) in fresh quartz
diorite or gabbro. Three water-filled pits each about 3 m
(10 feet) square have been blasted into the mineralized dike
on the northern side of a small pond. If this dike is actually
part of the Foy Offset, the Offset is in excess of 32 km (20
miles) in length and represents the longest known dike of the
Nickel Irruptive.
Uranium: in the Uite 1950s and again in the late. 1960s the
Huronian rocks in Moncrieff and Hess Townships were explored
for uranium, apparently with negative results.
MoJ-ybdenite and Fluorite: Minor amounts of fluorite occur in
pegmatite dikes and as joint coatings in a sru-11, fine-grained
quartz monzonite pluton which intrudes the metavolcanics along
Highway 144 about 0.4 km (-i; mile) north of Moncrieff Creek (2).
Several granitic dikes that extend from this pluton into the
tuff-breccia contain minor disseminated molybdenite and chal
copyrite yielding 0.05 percent Mo and 0.04 percent Cu upon assay
by the Mineral Research Branch.
Sand and Gravel: Extensive sand and gravel accumulations, glacial moraine and outwash deposits, occur throughout the
area, especially ground Cartier. These deposits have been utilized
for local road construction.
Card, K.D. , 1969:
Card, K.D., 1973:
1974:
1974;
I974b:
Collins, W.H 1917:
GSC1965:
Haw! ey , .I.E. 1948:
Holmes, T.C. 1953:
REFERENCES
and Meyn, H.D.Geology of Leinster-Bowell Area; Ontario Dept. Mines, GR65, 40p. Accompanied by Maps 2132, 2133, and 2134, scale l inch to h mile.
and Innes, D.C.Benny Area, District of Sudbury; p.111-117 in Summary of Field Work, 1973, by the Geological
Branch, edited by V.G. Milne, D.F. Hewitt and W.J. Wolfe, Ontario Div. Mines, MP56, 202p.
Benny Area, District of Sudbury; p.132-138 in
Summary of Field Work, 1974 by the Geological Branch, edited by V.G. Milne, D.F. Hewitt, and K.D. Card, Ontario Div. Mines MP59, 206p.
Benny Area, Moncrieff Creek Sheet, District of Sudbury; Ontario Div. Mines, Prelim. Map P.948, Geol. Ser., scale l inch to \ mile. Geology 1973.
Benny Area, Hess Lake Sheet, District of Sudbury; Ontario Div. Mines, Prelim. Map P.949, Geol. Ser. scale l inch to -k mile. Geology 1973.
Onaping Map-area; Geol. Surv. Canada, Mem. 95, I57p. Accompanied by Maps 153A, 179A.
Cartier Sheet, Ontario; Geol. Surv. Canada, Aeromagnetic Map 1524C, scale l inch to l mile. Survey June 1959 to October i960.
Lake Geneva Mine; p.590-596 in CTM Jubilee Vol.,
Structural Geology of Canadian Ore Deposits, 948p.
Gcojogy of Hart Township; Unpublished Ph.D. Thesis, University of Toronto, Toronto, Ontario.
Osborne, F.F, 1929:
Quirke, T.T. 1920:
The Cartier-Stralak Area, District of Sudbury; Ontario Dept. Mines, Vol. 38, pt.7, p.52-68 (published i 930). Accompanied by Map No. 38h scale l inch to l mile.
Geneva Map-Area, Sudbury District. Ontario; Geol. Surv. Canada, Summary Report, 1920, pt.D p.7D-18D.
Accompanied by Publication No.1865 (map), scale l inch to l mile.
ADJOINS STRALAK-BANNERMAN, LAKE SHEET, R 1107
:7cA
16,990,000 V...' .-. 7kt
16,980.000 N
t \..-i'-' •-•••
VK
16,9/0,000 N
usseou L
16,960,000 N
16,950,000 N
Ontario Division of Mines
HONOURABLE LEO BERNIER, Minister ot Natural Resources
DR. J. K. REYNOLDS, Deputy Minister of Natural Resources
G. A. Jewett, Executive Director, Division of Mines f. G. Pye, Director, Geological Branch
PRELIMINARY MAP P.. 1110*GEOLOCICAI SF.RTRS
BENNY AREA
SPANISH-JOHNSON LAKES SHEETDISTRICT OF SUDBURY
Scale; 1:15,840 or l inch to -k mile
NTS Reference: 41 I/12E ODr--r.SC Aeromagnetic Maps: l 524G
ODM Geological Compilation Map: 2l88
t/ODM 1976
*Note: Maps 1107, 1108, 1110-11 replace P.948 and 949 on the Benny area.
Parts of this publication may be quoted if credit is given to the Ontario
Division of Mines and the material is properly referenced.
LEGENDa
PHANEROZOIC CENOZOIC
QUATERNARYPLEISTOCENE AM) RECENT
Swamp deposits, gravel, sand, silt, clav.
UNCONFORMITY
PRECAMBRIANLA Tt: PRECAMBRIAN
NAFIC INTRUSIVE ROCKS
18 Diabase, olivine diabase
INTRUSIVE CONTACT
MIDDLE PRECAMBRIANSUDBURY NICKEL IRRUPTIVE - Foy Offset
17 U n su bd i v id cdl7a Quartz dioritel7b Metagabbro
LAMPROPHYRE AND BRECCIA
16 Unsubdivided16a Lanprophyre16b Lamprophyric breccia16c Psuedotachylite
breccia (Sudbury-Type)
INTRUSIVE CONTACT
NIPISSING DIABASE
15 Li n su bd i v i d cd15^ Pyroxene gabbroI5b Hornblende metagabbro,
amphibolite I5c Granophyric metagabbra,
granophyre
INTRUSIVE CONTACT
HURONIAN SUPERGROUP COBA1T GROUP
Lorrain Formation
14 Unsubdividedl 4a Feldspathic sandstone14b Greer., micaceous ptrbblv
sandstone 14c Buff and red hematitic
sandstone14d White quartz sandstone I4e Quartz- and jasper-
pebble conglomerate 14f Siltstone
Gowganda Formation
13 lin s u bd i v i d cd13a Polymictic paraconglo
merate13b Polymictic orthoconglo
merate13c Quartz-feldspar sand
stone13d Greywacke, siltstonel3e Laminated argillite,
siltstoneI3f .Sandstone-s i l tstone
slump breccia
QUIRKE LAKE GROUP
Serpent Forma l ion
12 Unsubdivided I2a Quartz-feldspar sand
stonel2b Hematitic sandstone 12 c Silts Lone 3 greywacke 12d Conglomerate, conglo
meratic sands Lone 12e Calcareous sandstone
Espanola Formation
11 Unsubdividedlla Limestonelib Dolostone, dolomitic
limestone Ile Siltstone, calcareous
siltstone l Id Sandstone, calcareous
sandstone ile Scapolite and diopside-
wollastonite hornfels
Bruce Formation
10 l.'nsubdividedlOa ConglomeratelOb Sandstone, siltstone
HOUGH LAKE GROUP
Mi ssi ssagi Formation
9 Unsubdivided9a Quarto-feldspar sand-
FELSIC INTKUSiVK AND METAMOht'MlC ROCKS
MASSIVE FELSIC PLUTONIC ROCKS
7 Unsubdivided/a Fine- to medium-grained
equigranular quartamonzonite
7b Coarse-grained equ i-granular quartz
^. monzonite7c Porphyritic, leucn- .
cratic quartz mi 'M zon ite
7d Porphyritic, bioti 1 Lequartz monzoni tt- .monzonite
7e Pegmatite 7 f Aplite
INTRUSIVE CONTACT
GNEISSIC FELSIC PLUTONIC AND M1GMAL1TIC ROCKS
6 Unsubdivided6a Gneissic {jranodi or i p e,
quartz monzonite 6b Auger: gneiss 6c Xenoli thic and agma-
titic granodiori l i-,quartz monzonite
fid Layered riigmatiticparagnoiKS
6e Layered mafic mign .titic orthogneib 1 . anddioritic and gabl ' lierocks
INTRUSIVE CONTACT
EARLY :-iAFIC INTRUSIVE ROCKS
5 Unsubdivided 5a Gneissic metagabbro
and amphi boli te
INTRUSIVE CONTACT
ME1AVOLCAN1CS ANT) METASEDIMENTS
METASEDIMZNTS C
4 Unsubdivided4a Tu f fa c c ou s greywack t .
siltstone4b Quartz-feldspar sand
stone4c Schis Lost; micaceous
and chloritic meta sediment t,
4d Graphitic siltstone4e Chert, siliceous
metasediments4f Sulphide-bearing
micaceous , eh l oritK and siliceous meta sediments and tuffa ceous metasediments.
Oxide-facies iron Co ra tion
METAVOLCANICS
Fclsi c Metavolcanics
3 Unsubdivided
3a Rhyolite, porphyrit ic rhyolite
3b Dacite, porphyritic, daci te
3c Crystal tuff, lapilli- tuf f
Intermediate. Metavolcanics
2 Onsubdivided 2a Tuff-breccia
(agglomerate) 2b Lapilli-tuff, lapilli-
crystal tuff 2c Tuff
Mafic Metavolcanics
l Un subd i v i d edla BasaltIb Andesitele Pillowed basalt,
andesite 1d Amygdaloidal basalt,
andesite le Mafic tuff
9b 9 c
stoneConglomerate Si Ttstone
UNCONFORMITY: FAULT CONTACT
EARLY PRECAMBRIAN
MAFIC INTRUSIVE ROCKS b
8 Unsubdivided8a MeLagabbro, amphibolite8b Porphyritic rr.etagabbro8c Granophyric ipetagabbro
Sulphide ninerali^ation.
a - This is basically a Field Legend and m; be changed, subsequent to Laboratory investi gat ion.
b - May include some Middle Precambrian mafic intrusive rocks equivalent in age. to Nipissing Diabase or younger.
c - Includes some fragmental metavolcanics: deformation and metamorphism has made it difficult to distinguish between
* fragmental neovolcanic s and meta sediments .
d - The letter "G" following a rock unit number (for example, 18G) indicates interpretation is based on geophysical data only.
GEOLOGICAL AND MINING SYMBOLS
Esker.
Small bedrock outcrop.
f'// l Fol- iacion ; (horizontal *-J inclined, vertical).
Area of bedrock outcrop.
Bedding, top unknown; (inclined, vertical).
Bedding, top Indicated by arrow; (inclined, vertical, overturned).
Bedding, top (arrow) from grain gradc-Liun; (inclined, vertical, overturned).
Bedding, top (arrow) from cross bedding; (inclined vertical, overturned).
Gneissosity, (horizontal, inclined, vertical).
Stratiform foliation.
Lineation with plunge.
Geological boundary, observed.
Geological boundary, position interpreted.
Geological boundary, deduced from geophysics.
Paul t; (as sumed).
Lineament.
Drag folds with plunge.
Shaft.
METAL AND MINERAL REFERENCE
Ag . . . . . . . . . . . . . . . SilverAu . . . . .. . . . . .. . . . Goldcp ............... ChalcopyriteCvi . . . . . . . . . . . . . . . CopperFe . . . . , . . . . . . . . . . Ironfi . . . . . . . . . . . . . . . Fluoritegf . . . . . . . . . . . . . . . Graphitegn .. .. . . . . . . . . . . . Galenamag . . . . . . . . . . . . . . Magneti te
mo K i Pb po
py
MolybdeniteNickelLeadPyrrhotitePyrite
S .. .. . . . ......... Sulphide mineralssp ..,............ SphaleriteZn . . . . . . . . . . ..... Zinc
LI ST,. OF PROPERTIES AND OCCURRENCE^ FOR F.U06-P.U11
Copper-Nickel Occurrence, Foy Offset dike, eastern Hess Township.
Fluorite and Molybdenum Occurrence, Moncrieff Township.
Geneva Metals Incorporated (Lake Geneva Mine), Hess Township.
Hess Lake Magnetite Occurrence, southwestern Hess Township.Munster Township Magnetite Occurrences.Sulphide Occurrence, northwestern Hess Township.Sulphide Occurrence, northeastern Moncrieff Township.
Sulphide Occurrence, southwestern Munster Township,
Zinc-Lead-Copper-Silver Occurrences, central Hess Township.
Magnetite Occurrence, central Hess Township.Sulphide Occurrence; north central Moncrieff Township.
Sulphide Occurrences, west central Moncrieff Township.
Sulphide Occurrences, western Moncrieff Township and eastern Craig Township.
Sulphide Occurrence, northeastern Craig Township.
Stralak Zinc-Lead-Copper-Silvcr Occurrences (west), Craig Township.
Stralak Zinc-Lead-Copper-Silver Occurrences (east), Craig Township and
Ulster Township.Straight Lake Sulphide Occurrence, Ulster Township.
Iron Formation Occurrence. Craig Township.
Mogo River Sulphide Occurrence, Craig Township.Bluewater Lake Sulphide Occurrence, Craig Township.Hart Township Zinc-Lead-Copptr-Cobalt-Nickel Occurrences.
SOURCES OF INFORMATION
Geology by K.D. Card, D.C. Innes, and assistants, 1973, 1974
Ontario Division of Mines Preliminary Geological Map No. P.948, Benny Area,
Moncrieff Creek Sheet, 1974, Ontario Division of Mines.
Preliminary Geological Map No.p.949,Benny Area, Hess Lake Sheet, 1974, Ontario
Division of Mines.
Preliminary C-eological Map No. p.287,Cartier Sheet, Ontario Department of Mines,
Geological Compilation Series, 1965.
Geophysical and Geological Maps and reports of mining companies.
Base-map derived trom maps of the Forest Resources Inventory, Ontario Division
of Lands, and Air Photographs, Air Photo Library, Ministry of Natural Resources.
Magnetic declination approximately 80W, 1973, 1974.
Issued 1976, ' " T -
InrurmaLiun from this publication -nay be quoted if credit is ewen to the
Ontario Division of Mines. 1L is recommended that reference to this be made in the following form:
Card, K.D., and Innes, D.G.
1976: Benny Area, Spanish-Johnson Lakes Sheet, District of Sud bury; Ontario uiv. Mines, Prelim. Map P.1110, Geol. Ser., scale 1:15,840 or l inch to k mile. Ceoloev 1973 1974*