Ontario Geological Survey
Permanent Link to this Record:
MDI42F04SW00002
| Record Name(s) | Agonzon Lake Molybdenum Occurrence - 1991 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 1991-Apr-02 |
| Date Last Modified | 2022-May-09 |
| Created By | |
| Revised By |
Primary Commodities: Molybdenum
Township or Area: Barehead Lake Area
Latitude: 49° 0' 2.82" Longitude: -85° 48' 37.75"
UTM Zone: 16 Easting: 587001.876 Northing: 5428224.551 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42F04SW
Point Location Description: Roadside outcrop
Location Method: Field Visit
Access Description: The Agonzon Lake molybdenum occurrence is located approximately 14 km south-southeast of Manitouwadge and 2.5 km east of the south end of Agonzon Lake. The occurrence is accessible via motor vehicle. From Manitouwadge, proceed south along Highway 614 for approximately 27 km to the old Camp 53 logging road. Proceed northeast along the Camp 53 logging road for approximately 12 km to the vicinity of the occurrence. Fine-grained molybdenite is reported to occur in a small metagabbroic intrusion located close to the road on its west side (Milne 1968, Map 2145).
1964-1965: Geological mapping; V.G. Milne (OGS). 1978: Regional lake sediment and water geochemical survey; GSC-MNR. Samples collected in the vicinity of Agonzon Lake contained anomalous amounts of Au and base metals but not Mo. 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). 1991: Reconnaissance till sampling survey; I.M. Kettles (GSC). Lithogeochemical sampling; D.B. McKay (OGS).
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Geological Age: Archean
Dec 07, 2005 (D McKay) - The occurrence is located within the Wawa subprovince and is underlain primarily by a small body of amphibolitic metagabbro surrounded by granodioritic gneiss of the Black-Pic batholith (Milne 1966, 1968; Williams and Breaks 1990). No significant geological structures occur within the vicinity of the occurrence.
| Rock Type | Rank | Composition | Texture | Relationship | Gabbro | 1 | Garnetiferous Metagabbro | Host |
|---|---|---|---|---|
| Gneiss-Unsubdivided | 2 | Granodioritic | Near |
Dec 07, 2005 (D McKay) - The metagabbro is tan-weathering, dark gray-green, coarse-grained, gneissic, non-magnetic and contains trace amounts of fine- to medium-grained pyrite as disseminated, subhedral to euhedral grains.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Molybdenite | Economic | Ore | ||||
| 2 | Pyrite | Economic | Ore |
Dec 07, 2005 (D McKay) - In his report for the area, Milne (1968, p.64) stated: A trace of an entirely different type of mineralization was noted in an outcrop of garnetiferous metagabbro on the Ontario Paper Company road about 1 1/2 miles east of the south end of Agonzon Lake. This metagabbro is intruded by the granodiorite gneiss of the Black-Pic Batholith, and it is cut by late rusty-weathering fractures. The fractures are coated with very minute cubes of pyrite and widely disseminated very fine molybdenite grains. This was the only location within the area where molybdenite was observed. McKay (1994) examined the occurrence in 1991 and provided the following comments: During the present examination of the occurrence, the metagabbro referred to by Milne (1968, p.64) was located on the west side of the old Camp 53 logging road, but no rusty-weathering fractures nor evidence of molybdenite mineralization was found. A grab sample of tan-weathering, dark gray-green, coarse-grained, non-magnetic, moderately foliated, gneissic amphibolite containing trace amounts of pyrite as disseminated grains was collected from the occurrence and returned assay results of nil Au, 43 ppm Cu and 10 ppm Mo.
| Rank | Classification |
|---|---|
| 1 | Hydrothermal |
| Rank | Characteristic |
|---|---|
| 1 | Disseminated |
Map - Black River area, northeast part, District of Thunder Bay
Publication Number: P0333 Scale: 1:31,680 Date: 1997
Author: Milne V.G.
Publisher Name: Ontario Dept. of Mines
Location:
MonoMap - Geology of the Black River area, District of Thunder Bay
Publication Number: R072 Date: 1968
Author: Milne V.G.
Publisher Name: Ontario Dept. of Mines
Location:
File - Schreiber-Hemlo Resident Geologist Mineral Deposit Files
Publication Number: Min Dep Date:
Author:
Publisher Name:
Location: Thunder Bay RGP
Map - Agonzon Lake sheet, Thunder Bay District
Publication Number: M2145 Scale: 1:31,680 Date: 1967
Author: Milne V.G.
Publisher Name: Ontario Dept. of Mines
Location:
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:
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:
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