MINERAL
INVENTORY FILE NO.
480
______________________________________________________________________________________________________
PRODUCT
COPPER
NTS AREA
63J13SW
REF.
CU 2
______________________________________________________________________________________________________
NAME OF PROPERTY
Stall Lake Mine
OWNER OF
OPERATOR ADDRESS
1959- Hudson Bay Mining and
Smelting Co., Limited
Flin Flon, MB
R8A 1N9
OBJECT LOCATED
Mine
MINING
DIVISION
The Pas
Latitude
54°51'10
Longitude
099°56'30
Uncertainty
(m)
100 m
UTM Zone
14U
Easting
439500
Northing
6078900
L.S./Quarter
Section
6,7
Section
2
Township
68
Range
17 WPM
DESCRIPTION OF
DEPOSIT
Sulphides occur along the crests of folds in the grey, Precambrian,
banded gneisses of the Amisk group, on the eastern extension of a syncline. The
tabular deposit strikes east, dips 45°N, and plunges north. No. 1 orebody is 76
m (250 ft) long, averages 4.6 m (15 ft) wide, and is 686 m (2250 ft) thick. No.
4 orebody is centered 152 m (500 ft) west, along strike from No. 1. No. 4 is 84
m (275 ft) long and its average width is 6 m (20 ft). It extends from 503 to 869
m (1650 to 2850 ft) below surface, but is open at depth. Two other ore zones
form sheets between No. 1 and No. 4. There are also several disseminated
orebodies between surface and 549 m (1800 ft).
Pyrrhotite, pyrite,
chalcopyrite, and minor sphalerite occur as coarse, recrystallized masses and as
disseminations. Hexagonal pyrrhotite with chalcopyrite and sphalerite occurs in
the upper part of the mine. Monoclinic pyrrhotite with pyrite, chalcopyrite, and
sphalerite is found in the lower part of the mine. Gold and silver were found by
assays and ore processing.
ASSOCIATED
MINERALS OR PRODUCTS OF VALUE
Zinc, gold, silver
HISTORY OF
EXPLORATION AND DEVELOPMENT
The mine is located west of Wekusko Lake, at the western end of Stall
(Miller) Lake, on the C.N. railway to Osborne Lake. Provincial Road 393 goes
past the mine.
Col 5 (P 9277) was staked by Colin Baker in 1945. No work was
done and it was cancelled two years later.
Astra 18 (P 35444) was staked in
1955, by W.F. Uhrich. Shortly afterward, it was assigned to Walter Johnson. In
September of that year, Hudson Bay Exploration and Development Company Limited
(H.B.E.D.) optioned the property. Geophysical surveys were probably made about
this time.
In 1956, H.B.E.D. did over 17 374 m (57 000 ft) of diamond
drilling in this area, including 4026 m (13 210 ft) on Astra 18. The company
took up their option, and the claim was assigned to H.B.E.D. The site was
cleared, and ore reserves were estimated to be 710 700 tonnes (t)(783 200 tons)
averaging 0.69 grams/tonne (g/t) (0.020 oz/ton) Au, 9.26 g/t (0.27 oz/ton) Ag,
4.54% Cu, and 0.4% Zn (Hudson Bay Mining and Smelting Co. Limited
(H.B.M.&S.), 1956 Annual Report).
An airborne electromagnetic survey was
done by Canadian Nickel Company Limited, under Airborne Permit No. 19, in 1957
(Non-confidential Assessment File No. 91624, GroundHog Sheet No. 10).
The
power line from Snow Lake and the road from Provincial Road 392 were completed
in 1957. The 3-compartment production shaft was started and sunk 217 m (713 ft).
The shaft was deepened in 1958, to 483 m (1585 ft) and in 1959, to 632 m (2073
ft). Stations were established at approximately 46-m (150-ft) intervals between
274 and 594 m (900 and 1950 ft). During 1958-59 exploration diamond drilling
totalled 2676 m (8780 ft) (H.B.M.&S., 1957-59 Annual Reports). The claim was
transferred to Hudson Bay Mining and Smelting Co. Limited (H.B.M.&S.), in
1959, and leased as M-5716.
Underground drilling, in 1960, proved ore to be
at least 762 m (2500 ft) below surface, but mineralization below the 594 m (1950
ft) level was not calculated in reserves. The shaft was continued to 811 m (2660
ft) with stations cut at 640 m, 686 m, 732 m, and 777 m (2100 ft, 2250 ft, 2400
ft and 2550 ft). In 1961, exploration diamond drilling totalled 2735 m (8974
ft). Underground exploration and development included 2713 m (8902 ft) of
lateral work. Surface lease M-103 was issued. In 1962, the reserve estimate was
increased to 1 351 000 t (1 489 000 tons) grading 5.4% Cu (Northern Miner, May
3, 1962) and then to 1.4 million t (1.5 million tons) grading 5.50 to 6% Cu
(Northern Miner, November 22, 1962). The production shaft was completed to 896 m
(2941 ft). Levels were established at 823 m and 869 m (2700 and 2850 ft). A
3-compartment service shaft was collared and sunk 14 m (47 ft).
The service
shaft reached its final depth of 872 m (2862 ft) in 1963. The mine produced 1477
t (1628 tons) of ore, which was sent to Ottawa for testing. Development
continued and almost 3048 m (10 000 ft) of exploration drilling was done.
The
mine came into production on the first of February ,1964 (See History of
Production for production figures). Diamond drilling and development work
continued through 1967. In 1967, the amount of exploration drilling increased
sharply. The following year, two holes, drilled in conjunction with Falconbridge
Nickel Mines Limited, cut ore 457 m (1500 ft) below surface along the eastern
boundary of the Hudson Bay property. Development took place on the 823 m and 869
m (2700 and 2850 ft) levels of the mine. Mining was done by the horizontal cut
and fill method.
Proven reserves as of January 1, 1968, were 1 899 800 t (2
093 600 tons) grading 1.51 g/t (0.044 oz/ton) Au, 10.63 g/t (0.31 oz/ton) Ag,
5.21% Cu, and 0.5% Zn (World Mining, February 1969). In 1969, H.B.M. & S.
reported that development work and exploration diamond drilling found an
additional 672 400 t (741 000 tons) of ore, averaging 3.5% Cu (H.B.M.&S.
Annual Report, 1969). Production was halted in November 1970, so that a winze
could be sunk from the 869 m (2850 ft) level. The 3-compartment winze was
completed to 1097 m (3600 ft) two years later. Drifting on the 594 m (1950 ft)
level began in 1970, in an attempt to intersect the ore found on the eastern
border of the property in 1967. The 1829 m (6000 ft) drift was completed in
1972, and was successful in locating the small orebody (H.B.M.& S. Annual
Report, 1970). After full production resumed, by 1973 most of the No. 1 orebody
was mined out (Northern Miner, July 26, 1973).
As of January 1974, reserves
at the Stall Lake Mine were 3 086 660 t (3 401 500 tons) grading 4.85%
Cu, 0.6% Zn, 8.57 g/t (0.25 oz/ton) Ag and 1.13 g/t (0.033 oz/ton) Au (Cranstone
and Hamilton, 1976). During 1974, a total of 576 m (1889 ft) of underground
drilling was done on Astra 18, and this, together with underground development
work, added 334 800 t (368 900 tons) of reserves below 869 m (H.B.M.&S.
Annual Report, 1974). By 1975, ore was developed to 1097 m (3600 ft) with more
ore at this level, than at any higher level (Financial Post, August 23,
1975).
In 1977, ore production increased gradually, and was maintained at 20
000 t (22 000 tons) per month towards the end of the year. Diamond drilling
below the 914 m (3000 ft) level indicated additional ore to the 1402 m (4600 ft)
level (H.B.M.&S., Annual Report 1977). This is a continuation of the No. 4
orebody (H.B.M.&S., Annual Report 1978).
A shortage of skilled miners and
tradesmen affected production at Stall Lake during 1980 (H.B.M.&S.,
Annual Report 1980).
The main 3-compartment production shaft (original depth
896 m (2941 ft), levels at 46 m (150 ft) intervals) was deepened in 1978. The
4th shaft collared on the 869 m level was to be sunk to 597 m (1960 ft) to reach
the orebody on the 1097 m (3600 ft) level (White, 1981). Work was completed on
the No. 4 internal shaft in 1979. The No. 4 orebody was confirmed to the 1402 m
(4600 ft) level.
Work done by the Manitoba Government included: sample
collection for an industrial minerals study by Yamada (1984); outcrop sampling
for trace element analyses by Eccles and Fedikow (1985); and experimental
Aurex-cup mercury gas surveys (Eccles and Fedikow, 1985; Fedikow, 1986). The
following measured and indicated reserves were reported:
Year Tonnage
Tonnes (tons) Average Grade..g/tonne
(oz/ton).....................................................
....................................................Au.....................Ag...............Cu
(%)....Zn(%).....Pb(%)
1978 3 564 970 (3 928 600).... 0.93 (0.027)...... 5.83
(0.17)........ 4.43..... 0.50
1979* 3 203 100 (3 529 800).... 0.96
(0.028)...... 5.83 (0.17)........ 4.44..... 0.40
1980 2 830 090 (3 118
760).... 0.99 (0.029)...... 5.14 (0.15)........ 4.20..... 0.30
1981* 2 762
500 (3 044 300).... 0.93 (0.027).......4.79 (0.14)........ 4.18..... 0.40
1983 2 584 774 (2 848 421).... 0.93 (0.027)...... 5.14 (0.15)........
4.41..... 0.32..... 0.185
*Proven reserves
Source: Cranstone and
Whillans (1978); Whillans and Cranstone (1979); Laughlin (1980, 1981, and
1983).
As of December 31, 1984, ore reserves were reported at 2 105 683 t
grading 4.42% Cu, 0.3% Zn, 1.2 g/t Au, 5.1 g/t Ag, and 0.016% (estimated) Pb
(Lemieux and Laughlin, 1985). As of December 31, 1984, production and reserves
totalled 6 264 000 t grading 4.33% Cu and 0.48% Zn (Bamburak, 1990, p. 6).
Underground drilling was undertaken in 1989, to test the area between the Stall
and Rod mines from the 590 m exploration drift (Northern Miner Magazine, March
1989).
In 1990, Hudson Bay began mining in conjunction with the nearby Chisel
Lake mine (See: Mind No. 828). In 1992, Hudson Bay announced their intent to
close the mine by 1994. The Stall Lake Mine was closed February 1994, due
to depletion of resources (Canadian Mines Handbook, 1994-1995).
HISTORY OF
PRODUCTION
Average Assays
Year Tonnage Tonnes (tons) g/tonne (oz/ton)
Au………….…Ag…………..% Cu…..% Zn
1964 ……..240 149 (264 645)………………. 1.51 (0.044)….
14.06 (0.41)…. 4.90….. 0.7
1965 ……..258 069 (284 392)………………. 1.47 (0.043)….
11.66 (0.34)…. 5.00 …..0.7
1966 ……..264 815 (291 826)………………..1.51 (0.044)……
9.94 (0.29)… 4.89….. 0.70
1967 ……..243 856 (268 729)………………. 1.58 (0.046)
….11.66 (0.34)…. 5.02…. 0.77
1968 ……..209 440 (230 800) ……………….1.71 (0.05)……
13.71 (0.4) …..4.5 …….0.8
1969 ……..185 200 (204 100)………………. 2.06 (0.06)
……20.57 (0.6) …..4.1……. 0.6
1970…….. 162 600 (179 200)………………. 2.06 (0.06)……
20.57 (0.6) …..4.3……. 0.7
1971……… 10 600 ( 11 700)……………….. 5.49 (0.16)……
17.14 (0.5)….. 5.8……. 1.6
1972……… 40 470 ( 44 600)……………….. 2.74 (0.08)…..
20.57 (0.6) ……4.9……. 1.2
1973…….. 156 080 (172 000)………………. 2.06 (0.06)…..
17.14 (0.5)… …4.3……. 0.8
1974…….. 129 855 (143 100)………………. 1.71 (0.05)…..
10.29 (0.3)…… 3.9……. 0.9
1975…….. 148 245 (163 366)………………. 1.03 (0.03)…..
10.29 (0.3) ……4.2……. 0.7
1976………186 843 (205 901)……………… 1.03 (0.03) …...10.29
(0.3) ……4.1…… 0.2
1977……… 239 243 (263 646)……………… 0.89 (0.026)….. 7.19
(0.21)… 4.36 …..0.18
1978……… 261 093 (287 724)……………… 1.19 (0.035) …..8.23
(0.24)…. 4.65 ….0.28
1979 ………247 143 (272 352)……………… 1.23 (0.036) …..7.89
(0.23) ….4.69…. 0.58
(HBMS, Annual Reports)
1980 ………241 137 (265
733)……………… 1.41 (0.041)…… 8.57 (0.25)… 4.58…. 0.52
(CMH
1981-82)
Shipping point: Stall Lake Distance from mine: 75-108
miles
Materal shipped: Ore Carrier: CNR
Destination: Flin
Flon
Began treating ore from Stall Lake mine in the Snow Lake
concentrator which commenced operations in April 1979.
Production figures for
individual mines are no longer published by H.B.M.&S. However the following
figures were published by Esposito (1986) for the Stall Lake mine, which
was still in production in 1986:
Years Tonnes Cu (%) Zn (%)
1984 249
174 4.11 0.5
1964-end of 1984 4 158 096 4.29 0.57
1985-1990 Unknown
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.
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developing
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MAP REFERENCES
Armstrong, J.E. 1941: Map 665A, Wekusko, 1:63 360 scale, geological
map accompanying
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1:253 440 scale, geological
compilation map, accompanying Manitoba Mines
Branch, Paper 1/71
Campbell, F.H.A., Bailes, A.H., Ruttan, G.D. and
Spooner, A. 1970: Map 2 Wekusko or Herb
Lake; 1:31 680 scale, geological map,
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Figure 2 Snow Lake area, Manitoba; 1:50 000 scale, geological
map,
accompanying Geological Survey of Canada, Paper 78-27.
Geological Survey
of Canada 1970: Map 25019G; Geological Survey of Canada,
airborne
electromagnetic and AFMAG, scale 1:50 000.
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of Canada 1990: Maps 63J/13 c,d; GSC Open File 2219, Geological Survey
of
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maps,
scale 1:20 000.
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Manitoba Energy and Mines and Geological Survey of Canada 1990:
Maps C 21507G, C 41507G
Herb Lake, Manitoba Energy and Mines and Geological
Survey of Canada, aeromagnetic Total Field and Vertical Gradient, colour
compilation maps, Scale 1:50 000.
Manitoba Mines Branch: 63J/13SW Claim
Map Series, circa 1976, Mining Recording, Manitoba
Mines Branch, claim map,
scale 1:31 680.
Mihychuk, M. 1988: Preliminary Map 1988 SL-1 Herb Lake,
Manitoba Mineral Resources Division
surficial geology and aggregate
resources, scale 1:50 000.
Klassen, R.W., Netterville, J.A. 1980: Map
4-1979 Wekusko Lake, Manitoba; Geological Survey
of Canada, surface
geological map, scale 1:250 000.
Province of Manitoba and Geological
Survey of Canada 1965: Map 2566G Herb Lake, Province
of Manitoba and
Geological Survey of Canada, aeromagnetic, scale 1:63 360.
Province of
Manitoba, Geological Survey of Canada 1979: Map 36063G Wekusko Lake;
Province
Of Manitoba, airborne gamma ray spectrometry maps, scale 1:250
000,
Russell, G.A. 1957: Map 55-3 Snow Lake - Herb Lake area; 1:31 680
scale, geological map,
accompanying Manitoba Mines Branch, Publication
55-3.
Surveys and Mapping Branch, Ottawa: Map 63J/13, Herb Lake; Surveys
and Mapping Branch,
Ottawa, topographic map, scale 1:50 000.
URL
N/A
Images
0480-1,2
REMARKS
Minor chalcopyrite with pyrite and pyrrhotite was found on Fox 5 and
13, north of Snow Creek, when Guardian Mines Limited diamond drilled a Turam
anomaly in 1967 (Non-confidential Assessment File No. 90139).
The shafts and
most of the reported work were done on Astra 18 and hence its history described
on this card. The orebody being mined by the 1829 m (6000 ft) drift is the No. 2
zone described on mineral inventory card 481(Rod mine).
Construction of a
3448 t (3800 ton) concentrator, adjacent to Stall Lake mine, began July
4, 1977, with first ore treated in April 1979, and in production by end of the
year. The design provides for 2 separate treatment circuits: one for ore from
Chisel and Ghost Lake mines (See: Mind Nos. 828 and 104#); the other for ore
from Stall, Anderson and Osborne Lake mines (See: Mind Nos. 482 and 479). Copper
and zinc concentrates were shipped to metallurgical plant at Flin Flon, along
with a lead concentrate sold directly to a lead smelter. Mill tailings produced
are expected to provide 227 000 t (250 000 tons) annually of backfill,
sufficient for Snow Lake mines requirements (H.B.M.&S., 1977 Annual
Report).
Ore mined from Snow Lake area mines, in 1983, totalled 826 093
tonnes (910 355 tons) grading 2.57% Cu and 2.80% Zn. The Osborne Lake mine was
closed in 1984, but the Rod mine (See: Mind No. 481) started shipping ore to the
Snow Lake mill in March 1984, and replaced the loss of Osborne Lake ore
(H.B.M.&S., 1983 Annual Report, SEC Form 10-K, CMH 1986-87, p. 188; F.P.
Info Service 10/11/86).
NOTES
N/A
Compiled/Revised
by:
SMH JDB HRW AGJ PA JJJ
Date
05-69 08-72 08-76 06-77 01-82 01-87 08-91 06-02
