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George W. MacLeod mine, McMurray Township, Algoma District, Ontario, Canadai
Regional Level Types
George W. MacLeod mineMine
McMurray TownshipTownship
Algoma DistrictDistrict
OntarioProvince
CanadaCountry

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Key
Latitude & Longitude (WGS84):
48° 0' 58'' North , 84° 45' 39'' West
Latitude & Longitude (decimal):
Locality type:


See also https://www.mindat.org/loc-179952.html [Helen-MacLeod Mines, McMurray and Chabanel Townships, Algoma District, Ontario, Canada]

Multiple ore zones of the Helen Iron Range have been operated at different times under a variety of names by the Algoma Steel Corporation and affiliated companies:

1953: Algoma Ore Properties - No. 5 shaft started and reaches 283 feet (eventually the Macleod production shaft), surface diamond drilling.

1954: Algoma Ore Properties - No. 5 shaft to 1895 feet, 1800 foot long inclined tramway driven and tied to aerial tramway.

1955: Algoma Ore Properties - No. 5 shaft to 2066 feet, tramway extended to 4410 feet.

1956: Algoma Ore Properties - construction of new sintering plant.

1957-59: Algoma Ore Properties - underground tramway extended to 4877 feet, surface diamond drilling.

1960: Algoma Ore Properties - production from old Helen ore body ceases, production from G. W. Macleod Mine begins.

1998: G. W. Macleod Mine closes and mine rehabilitation begins.

The Helen Iron Range is one of 32 separate iron ranges that make up the Michipicoten Iron Formation. This iron formation caps the 2750 Ma volcanic cycle in the Wawa area and represents a period of considerable chemical and clastic sedimentation. The iron range is terminated by the Talbot Lake Fault at the west end and the Wallbank Lake Fault at the east end. The great thickness of the iron formation at its west end is due to tectonic activity along the Talbot Lake Fault which thickened the iron formation by drag folding.

All five facies are developed in this iron formation, however, all mining at the Macleod Mine has taken place in the carbonate (siderite) facies. A chert horizon lies between the siderite and the footwall volcanic rocks. This unit is not observed in any of the other iron ranges. Some chert and argillite have also been reported at the base of the carbonate facies. Their presence may be due to tectonic activity along the Talbot Fault.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


9 valid minerals.

Detailed Mineral List:

Calcite
Formula: CaCO3
Reference: Rocks & Min.:59:205-207.; John A. Jaszczak
Dolomite
Formula: CaMg(CO3)2
Reference: Rocks & Min.:59:205-207.; John A. Jaszczak
Galena
Formula: PbS
Reference: Ontario Ministry of Northern Development and Mines
Goethite
Formula: α-Fe3+O(OH)
Reference: Rocks & Min.:59:205-207.; John A. Jaszczak
Grunerite
Formula: ☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2
Hematite
Formula: Fe2O3
Reference: John A. Jaszczak
Pyrite
Formula: FeS2
Reference: Rocks & Min.:59:205-207.; John A. Jaszczak
Pyrrhotite
Formula: Fe7S8
Reference: Ontario Ministry of Northern Development and Mines
Siderite
Formula: FeCO3
Reference: Rocks & Min.:59:205-207.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Group 4 - Oxides and Hydroxides
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Dolomite5.AB.10CaMg(CO3)2
Siderite5.AB.05FeCO3
Group 9 - Silicates
Grunerite9.DE.05☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Pyrrhotite2.8.10.1Fe7S8
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Siderite14.1.1.3FeCO3
AB(XO3)2
Dolomite14.2.1.1CaMg(CO3)2
Unclassified Minerals, Mixtures, etc.
Grunerite-☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2

List of minerals for each chemical element

HHydrogen
H Goethiteα-Fe3+O(OH)
H Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
CCarbon
C CalciteCaCO3
C DolomiteCaMg(CO3)2
C SideriteFeCO3
OOxygen
O CalciteCaCO3
O Goethiteα-Fe3+O(OH)
O DolomiteCaMg(CO3)2
O SideriteFeCO3
O Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
O HematiteFe2O3
MgMagnesium
Mg DolomiteCaMg(CO3)2
SiSilicon
Si Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
SSulfur
S PyriteFeS2
S PyrrhotiteFe7S8
S GalenaPbS
CaCalcium
Ca CalciteCaCO3
Ca DolomiteCaMg(CO3)2
FeIron
Fe Goethiteα-Fe3+O(OH)
Fe PyriteFeS2
Fe SideriteFeCO3
Fe Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
Fe HematiteFe2O3
Fe PyrrhotiteFe7S8
PbLead
Pb GalenaPbS

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Rocks & Minerals (xxxx) 59, 205-207.
Ontario Ministry of Northern Development and Mines MDI Number: MDI42C02SW00004
Grice, Joel D. (1989) The MacLeod Iron Mine, Ontario. In: Famous mineral localities of Canada. Published by Fitzhenry & Whiteside Limited & the National Museum of Natural Sciences, 190 pages: 73-78; 156.

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