MINERAL
INVENTORY FILE NO.
999
______________________________________________________________________________________________________
PRODUCT
PLATINUM
NTS AREA
52L6NW
REF.
PT 1
______________________________________________________________________________________________________
NAME OF PROPERTY
DUMBARTON MINE LEASE
(Dumbarton Mines, Maskwa West Pit)
OWNER OF
OPERATOR ADDRESS
1988 – Maskwa Nickel Chrome Mines Limited (N.P.L)
Box 40, Commerce
Court West
Toronto ON M5L 1B4
OBJECT LOCATED
Centre of Dunbarton M.C.
MINING
DIVISION
Winnipeg
Latitude
50°28.15’
Longitude
95°26.74’
Uncertainty
(m)
500 m
UTM Zone
_____
Easting
_______
Northing
_______
L.S./Quarter
Section
___
Section
26, 35
Township
17
Range
15 EPM
DESCRIPTION OF
DEPOSIT
The occurrence is on the south limb of the Bird River Sill.
In a
company report of Stanmore Mining and Smelting Limited, Browne (1938) reported
that "traces of platinum group, gold, and silver were found in most of the
Oiseau cores". The company's 'Oiseau property' appears to be within the
'Dumbarton Mine lease' area (see Remarks).
In 1968, Consolidated Canadian
Faraday Limited did 1219 m (4000 ft) of drilling on the Dumbarton Mine property:
platinum and palladium values were reported to be "interesting" (Mineral
Inventory card 52L/6 NI 1). Later, two random samples of flotation concentrate
indicated metal contents (by weight) of: 4.69% Cu, 8.50% Ni, 1.234 g/tonne
(0.036 oz/ton) Pt, 3.771 g/tonne (0.11 oz/ton) Pd; and 5.96% Cu, 9.88 % Ni,
1.097 g/tonne (0.032 oz/ton) Pt, 4.114 g/tonne (0.12 oz/ton) Pd (Karup-Moller
and Brummer, 1971). Small amounts of PGM by-products were produced from the
deposit (see History of Production).
In 1986, old drill-core from the
Dumbarton Mine and Maskwa West pit areas was sampled by the Manitoba Mines
Branch; drill-core assays of up to 220 ppb Pt, 320 ppb Pd over 0.3 m (1 ft)
intervals were reported. Results are shown in Table 1.
The Geological Survey
of Canada (GSC) reported contents of up to 260 ppb Pt and 1760 ppb Pd in Ni-Cu
ores from the Dumbarton Mine, which were analyzed using a lead fire assay and
carbon-rod atomic absorption spectrometry method. The ore samples were obtained
from ore collections of the GSC. Results, representing heavy mineral
concentrates, are shown in Table 2.
Geological descriptions of these areas
are detailed in Mineral Inventory cards 52L/6 NI 1, NI 2.
ASSOCIATED
MINERALS OR PRODUCTS OF VALUE
Copper, nickel, arsenic, gold, silver, cobalt, lead, chromite,
zinc.
HISTORY OF
EXPLORATION AND DEVELOPMENT
Table 1: Pt and Pd in ore of the Dumbarton Mine and the Maskwa West
Pit
(Source: Theyer, 1986:126)
DDH#................…Sample #
From-To… Pt………...Pd……………..Mineralization
FB 74/42
DM-1.....204'-205'………….......30………....64………………..3-5% py, minor cpy
FB 74/42
DM-2.....209'-210'…………........LT 20……..63………………..2-3% py
FB 74/42
DM-3..…225'-226'…………....... LT 20……..16………………..1% py and cpy
FB 74/42
DM-4..…229'-230'…………....... 20…….......66……………….2-4% py and cpy
FB 74/42
DM-5..…233'-234'…………....... 40………....61……………….2-3% py and po intergrown
FB
74/42 DM-6..…241'-242'…………....... 30………....75……………….5% py in clusters
FB
74/42 DM-7..…296'-297'…………....... 30………....320…..……......7-8% py, minor po and
cpy
FB 74/43 DM-9..…307'-308'…………....... 50………....210……………..3-5% diss. py
minor cpy
FB 74/43 DM-10 …319'-320'…………....... 60………....280………….…1-2% diss.
py
FB 74/43 DM-11 …359'-360'…………....... 50………....200…………….1% diss.
py
B45…..DM-12… …321'-322'…………..LT 20…….........7……………….1% diss.
py
B45…..DM-13… …335'-336'…………......30……….....210………………10-15% py and
po
B45…..DM-14… …367'-368'…………...LT 20…….......43……………….20-25% py and
po
B48…..DM-15....…318'-319'…………..LT 20…….........2……………….sporadic diss.
py
B48…..DM-16… …322'-323'…………...LT 20……........26……………….10% diss.
py
B48…..DM-17… …352'-353'………….....220……........190……………….10% py in clusters
and veins
............….........and 357'-358'……..
B50…..DM-18…
…394'-395'…………....... 30……….....32……………….approx. 80%
po
___________________
LT - less than
Table 2: Preliminary
analyses of Ni-Cu ores from the Dumbarton Mine
(Source: Jonasson et al.,
1987)
..................................................Pt.....Pd....Au.......Pt
....................As....Sb....Mo...Hg...ppb...ppb...ppb...Pt+Pd...Se...Te...Bi...U.......Sample
Dumbarton....11......1.....5.....0.10..260...625...35...0.294.....36....8.....3...0.00....467
Mine,
.............1......1....5.....0.21..255..1760...80...0.127.....63....9.....3...0.00....468
Manitoba.........3......1...5......0.16..90....1280...25...0.066......-.....0.....3...0.05....469
......................3......1...5......0.08...0......500...40...0...........33....0.....3...0.08....470
......................1......1...3......0.06...0.....465...25....0...........48....0.....3...0.00....537
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Mean
Values ..1......1..3.....0.12..121...926....41....0.116....45....3.....-....
-
D.L.................1......1..3.....0.01...5......5........5.................1.....1.....3....0.005
-
indicates no data; D.L. = detection limits; values in ppm unless
noted.
The Dumbarton Mine is located about 4.8 km west of Oiseau (Bird)
Lake, 5.6 km north of Bernic Lake and is crossed over by Provincial Highway No.
315; the Maskwa West nickel deposit is 1.2 km southwest of the Dumbarton
Mine.
The Dumbarton deposit was mined from 1969 to 1973 by Dumbarton Mines
Limited, a company jointly owned by Consolidated Canadian Faraday Limited and
Maskwa Nickel Chrome Mines Limited (59% owned by Falconbridge Nickel Mines
Limited); the Maskwa West Open Pit was mined in 1975-76 by Dumbarton Mines
Limited.
A detailed history of mining exploration and development in this
area can be found in Mineral Inventory cards 52L/6 NI 1, NI 2, CU 2.
HISTORY OF
PRODUCTION
Table 3: Dumbarton Mine PGM production; 1970 - 1973
1970.....18
662 g (600 oz) PGM*
197l......24 882 g (800 oz) PGM*
1972.....24 882 g
(800 oz) PGM*
1973 (?) 9 700 g (311.97 oz) Palladium**
*Report of the
Task Force, 1974.
**Consolidated Canadian Faraday Limited, Annual Report
1973.
Table 4:Dumbarton Mines Limited- Estimated Metal Production for
Manitoba (Source: Report of the Task Force on Manitoba Minerals Policy, 1974:
90).
Year.........................Metals
(thousands)
.........................Cobalt......Copper.....Gold......Nickel.....Platinums*...Silver
...........................(lbs)........(lbs)........(oz)......(lbs)...........(oz)...........(oz)
1970...................14.2.........1
369.......0.5.......3
048.........0.6............9.4
1971...................12.4.........1
564.......0.4.......3
711.........0.8............9.8
1972...................16.1.........1
493.......0.5.......4 032.........0.8...........10.4
*Calculated using Pt/Ni:
0.0004 for 1970; and Pt/Ni: 0.0002 for 1971 and 1972
REFERENCES
Browne, L.M.
1938: Information on Maskwa and Oiseau property of
Stanmore Mining and Smelting Limited; in Manitoba Mines Branch, Unpublished
Information File, 52L/12NE.
Canadian Minerals Yearbook
1974: Platinum
metals; Energy, Mines and Resources, Mineral Report No. 24, p.393.
Coats,
C.J.A., Stockford, H.R. and Buchan, R.
1979: Geology of the Maskwa West
nickel deposit, Manitoba; The Canadian Mineralogist, v. 17,
p.309-318.
Davies, J.F.
1955: Geology and mineral deposits of the Bird
Lake area, Lac du Bonnet Mining Division, Manitoba; Province of Manitoba,
Department of Mines and Natural Resources, Mines Branch, Publication 54-1,
44p.
Fogwill, D.W. and Bamburak, J.D.
1987: Mining in Manitoba; Manitoba
Energy and Mines, Mineral Education Series, p.25.
Jonasson, I.R., Eckstrand,
O.R. and Watkinson, D.H.
1987: Preliminary investigations of the abundance of
platinum, palladium and gold in some samples of Canadian copper-nickel ores; in
Current Research Part A; Geological Survey of Canada, Paper 87-1A,
p.835-839.
Karup-Moller, S. and Brummer, J.J.
1971: Geology and sulphide
deposits of the Bird River claim group, southeastern Manitoba; in Geoscience
Studies in Manitoba, ed. A.C. Turnock; Geological Association of Canada, Special
Paper No. 9, p.143-154.
Manitoba Mines Branch:
a Corporation Files;
Consolidated Canadian Faraday Limited; Dumbarton Mines Limited.
b Mineral
Inventory cards; 52L/6: NI 1 (Dumbarton Mine), NI 2 (Maskwa West), CU 2
(Colossus); 52L/5: PT 1 (Chrome), PT 2 (Trimpus).
c Annual Reports; 10th
p.69, 11th p.114-115.
d Unpublished Information Files; 52L/6,
52L/12NE.
Report of the Task Force on Manitoba Minerals Policy, 1974;
Department of
Mines, Resources and Environmental Management, p. 54, 90, 115,
117-119.
Theyer, P.
1980: Stratigraphic setting of selected ultramafic
bodies in the Superior and Churchill provinces and certain aspects of
nickel-copper deposits in the Thompson Nickel Belt; Manitoba Department of
Energy and Mines, Mineral Resources Division, Economic Geology Report ER79-2,
p.21
MAP REFERENCES
*Map 52L/6, West, Ryerson Lake (Topo), Scale 1:50 000, Mines and
Technical Surveys, Canada.
Map 1194G, Ryerson Lake, (Aeromag), Scale 1:63
360, Manitoba Mines Branch and Geological Survey of Canada.
Map 54-1, Bird
Lake area, (Geol), Scale 1:12 000 - Accompanying Report by Davies (1955),
Manitoba Mines Branch.
Preliminary Map 1972F-1, Geological compilation map of
the Bird River area, (Geol), Scale 1:50 000, by D.L. Trueman, Manitoba Mines
Branch.
Preliminary Map 1975F-9, Bird River area east (Geol), Scale 1:31 680,
by D.L. Trueman, Manitoba Mines Branch.
Map ER79-2-6, Geology and mineral
deposits of the Bird River Sill (Geol), Scale 1:125 000 - Accompanying Report by
Theyer (1980), Manitoba Mineral Resources Division.
#Claim Map Series NW 6,
52L, Scale 1:31 680, circa 1974, Mining Recording, Manitoba Mines
Branch.
REMARKS
1. Stanmore Mining and Smelting Limited's 'Oiseau
property' consisted of 53 claims in the Bird (Oiseau) River area, many of which
are found within the 'Dumbarton Mine lease' area (see Mineral Inventory card
52L/6 NI 1). Stanmore had apparently incorporated in 1937 to take over the
holdings of Great Falls Mining and Smelting Company, Limited and Northfield
Mining Company, Limited.
It was reported that 1737 m (5700 ft) of
diamond-drilling was done on the Dumbarton, Chance, Martin, Colossus M.C.,
Colossus #12, #13, and #15 claims in 1936, with 184 m (605 ft) on the Colossus
claim (see 52L/6 CU 2) in 1937.
2. Other platinum occurrences on the south
limb of the Bird River Sill are documented in Mineral Inventory cards 52L/5 PT
1, PT 2.
URL
N/A
REMARKS
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NOTES
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Compiled/Revised
by:
PA
Date
2-88 19__-__-__ 20__-__-__