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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*