Ontario Geological Survey
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MDI42F04NE00016
| Record Name(s) | Banana Lake Garnet Occurrence - 1991, Banana Lake Property, Claim Group 91-3 - 9999, Banana Lake Group - 9999 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 1996-Dec-19 |
| Date Last Modified | 2022-May-09 |
| Created By | |
| Revised By |
Primary Commodities: Garnet (Nonmetals)
Township or Area: Herbert
Latitude: 49° 12' 24.2" Longitude: -85° 32' 56.96"
UTM Zone: 16 Easting: 605676.924 Northing: 5451449.632 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42F04NE
Point Location Description: Outcrop
Location Method: Field Visit
Access Description: The Banana Lake garnet occurrence is located in Herbert Township approximately 22.5 km northeast of Manitouwadge and 2.5 km east of Banana Lake. The occurrence is accessible via motor vehicle followed by travel on foot. From Manitouwadge, proceed east and then northeasterly along the Camp 70 logging road for approximately 23 km to the Mooseskull Road. Proceed east along the Mooseskull road for approximately 2.5 km to an unnamed secondary logging road located just west of where the Mooseskull road bends sharply to the north. Proceed south along this unnamed road for approximately 1.4 km to the midpoint of a small unnamed lake located adjacent to the road on its west side. Several lines of a grid cut in 1991 cross the road in this area. Proceed east along the grid for approximately 300 m to the vicinity of the occurrence. Several large exposures of orthoamphibole-garnet gneiss occur in this area.
1958: Line cutting, geological mapping and ground geophysical surveys (MAG, EM); Mining Corporation of Canada Limited. 1967: Geological maping; J. F. Giguere (ODM). 1978: Regional lake sediment and water geochemical survey; GSC-MNR. Samples collected from lakes in the vicinity of the occurrence contained slightly anomalous amounts of Cu and Zn. 1989: Geological mapping; H. Williams and F. Breaks (OGS). Dighem airborne geophysical survey (EM, MAG, VLF-EM); Noranda Exploration Company, Limited and Noranda Minerals Inc. (Geco Division). Line cutting, ground geophysical surveys (HLEM, GRAVITY), soil sampling and lithogeochemical sampling; Noranda Exploration Company, Limited and Noranda Minerals Inc. (Geco Division). 1991: Reconnaissance till sampling program; I.M. Kettles (GSC). Samples collected in the vicinity of the occurrence did not contain anomalous amounts of gold nor base metals. 1992: Lithogeochemical sampling; D.B. McKay (OGS). 1992-1993: Line cutting, geological mapping, a ground geophysical survey (HLEM) and lithogeochemical sampling; Noranda Minerals Inc. (Geco Division). Geological mapping; E. Zaleski and V. Peterson (GSC).
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Belt: Manitouwadge-Hornepayne
Geological Age: Archean
Metamorphism Type: Regional
Metamorphism Grade: Amphibolite
Dec 07, 2005 (D McKay) - The occurrence is located within the Wawa subprovince and is underlain primarily by a complexly folded, narrow (typically 75 m wide on surface), northerly-trending, discontinuous belt of locally hydrothermally altered mafic to intermediate metavolcanic gneiss (Zaleski and Peterson 1993; Peterson and Zaleski 1994). The hydrothermal alteration and subsequent metamorphism has resulted in the development of garnet-orthoamphibole bearing assemblages. This thin belt of altered supracrustal rocks has been traced along strike to the north for approximately 3 km to the vicinity of One Otter Lake (Zaleski and Peterson 1993). The metavolcanic rocks are locally intruded by granitic and pegmatic material and are bounded on all sides by magnetic, moderately foliated, possibly synvolcanic, quartz-rich tonalite (Wolfson 1991; Zaleski and Peterson 1993). The supracrustal rocks in this area are moderately to locally strongly foliated. Mineral assemblages suggest these rocks have experienced upper amphibolite facies-grade regional metamorphism (Williams and Breaks 1989, 1990). Peterson and Zaleski (1994) have tentatively correlated the altered rocks comprising the occurrence with the Geco horizon (Falconbridge Zone), separated by an interpreted sinistral shear zone.
| Rock Type | Rank | Composition | Texture | Relationship | Orthogneiss | 1 | Gt-Orthoamphibole Gneiss | Host |
|---|
Dec 07, 2005 (D McKay) - The occurrence consists primarily of coarse-grained (up to 5 cm in diameter), subhedral porphyroblasts of spongy, purple garnet and bluish-gray, radiating masses of coarse-grained orthoamphibole (possibly anthophyllite or gedrite) hosted within mafic metavolcanic gneiss.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| Garnet | Alteration | Hydrothermal | 1 | ||||
| Anthophyllite | Alteration | Hydrothermal | 2 |
Dec 07, 2005 (D McKay) - The occurrence consists primarily of coarse-grained (up to 5 cm in diameter), subhedral porphyroblasts of spongy, purple garnet and bluish-gray, radiating masses of coarse-grained orthoamphibole (possibly anthophyllite or gedrite) hosted within mafic metavolcanic gneiss. These two alteration minerals may comprise up to 100% of the rock and typically comprise over 50%. The relative proportions of garnet and orthoamphibole vary from exposure to exposure, but generally these two minerals occur in subequal amounts. In one scarp-face exposure however, fine- to medium-grained garnet constitutes approximately 95% of the altered rock. No sulphide mineralization was observed during the present examination of the occurrence. This occurrence is significant in that it is mineralogically and geochemically similar to hydrothermally altered rocks that stratigraphically underlie the volcanogenic base metal deposits in the Manitouwadge camp. As a consequence, the area surrounding the Banana Lake garnet occurrence is considered to have high potential to host VMS-type base metal mineralization. In this regard, it is significant to note that the Herbert Township zinc-copper-silver deposit (i.e., the Falconbridge Zone) and the One Otter Lake East zinc occurrence are located approximately 2.1 km to the southwest and 2.1 km to the northeast, respectively. As postulated by Zaleski and Peterson (1993b), the hydrothermally altered rocks exposed at the Banana Lake garnet occurrence may represent the faulted continuation of the footwall assemblage to the Herbert Township zinc-copper-silver occurrence. A grab sample collected from the occurrence in 1993 by D.B. McKay for the OGS returned assay results of <5 ppb Au, <0.1 ppm Ag, <1.0 ppm As, <10 ppm Ba, 8 ppm Cu, 90 ppm Cr, 6 ppb Hg, 9 ppm Mo, 5 ppm Pb, <0.2 ppm Sb, 5 ppm Sr, 17 ppm Zn and 12.72% Al2O3, 0.34% CaO, 17.82% Fe2O3, <0.05% K2O, 8.17% MgO, 0.04% MnO, 0.59% Na2O, 59.98% SiO2, 0.85% TiO2 and 0.40% LOI.
| Rank | Classification |
|---|---|
| 1 | Metamorphic |
| 2 | Volcanogenic |
| Rank | Characteristic |
|---|---|
| 1 | Stratabound |
Map - Granitehill Lake area, Thunder Bay and Algoma districts
Publication Number: M2219 Scale: 1:63,360 Date: 1972
Author: Giguere J.F.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
Mono - Mineral Occurrences in the Manitouwadge Area, Volumes 1, 2 and 3
Publication Number: OFR5906 Date: 1994
Author: McKay D.B.
Publisher Name: Ontario Geological Survey
Location:
File - Schreiber-Hemlo Resident Geologist Mineral Deposit Files
Publication Number: Min Dep Date:
Author:
Publisher Name:
Location: Thunder Bay RGP
Map - Geology of the Manitouwadge-Hornepayne area
Publication Number: OFM0142 Scale: 1:50,000 Date: 1990
Author: Williams H.R., Breaks F.W.
Publisher Name: Ontario Geological Survey
Location:
Map - Geology of the Manitouwadge greenstone belt, Ontario
Publication Number: OF 2753 Scale: 1:25,000 Date: 1993
Author: Zaleski, E; Peterson, V L
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/183964
MonoMap - Geology of the Granitehill Lake area, districts of Algoma and Thunder Bay
Publication Number: R095 Date: 1972
Author: Giguere J.F.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
Article - Geological studies in the Manitouwadge-Hornpayne area
Publication Number: MP146.014 Page: 79-91 Date: 1997
Author: Williams H.R., Breaks F.W.
Publisher Name: Ontario Geological Survey
Location:
Map - Total field aeromagnetic map of the Manitouwadge greenstone belt
Publication Number: OF 2754 Scale: 1:25,000 Date: 1993
Author:
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/183965
Article - Geological studies in the Manitouwadge-Hornepayne region
Publication Number: MP151.006 Page: 41-47 Date: 1997
Author: Williams H.R., Breaks F.W.
Publisher Name: Ontario Geological Survey
Location:
Map - Shaded relief aeromagnetic map of the Manitouwadge greenstone belt
Publication Number: OF 2755 Scale: 1:25,000 Date: 1993
Author:
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/183966
Publication - Structure and tectonics of the Manitouwadge greenstone belt and Wawa-Quetico subprovince boundary, Superior Province, northwestern Ontario; Geological Survey of Canada, Current Research no. 1994-C
Publication Number: Cur Res 1994-C Page: 237-247 Date: 1994
Author: Peterson, V L; Zaleski, E
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/193831
Publication - Geological, geochemical, and age constraints on base metal mineralization in the Manitouwadge greenstone belt, northwest Ontario; Geological Survey of Canada, Current Research no. 1994-C
Publication Number: 94-C1b Page: 225-235 Date: 1994
Author: Zaleski, E; Peterson, V L; van Breemen, O
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/193830
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