Ontario Geological Survey
Permanent Link to this Record:
MDI31C05NE00146
| Record Name(s) | Allan Mills - 1991 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 1991-Jun-20 |
| Date Last Modified | 2024-Mar-22 |
| Created By | |
| Revised By |
Primary Commodities: Magnetite
Secondary Commodities: Silver, Vanadium
Township or Area: Seymour
Latitude: 44° 24' 26.55" Longitude: -77° 43' 16.33"
UTM Zone: 18 Easting: 283326.55 Northing: 4920722.67 UTM Datum: NAD83
Resident Geologist District: Southern Ontario
NTS Grid: 31C05NE
Point Location Description: General
Location Method: Conversion from MDI
Access Description: SW of Allan Mills.
1951 and 1953 - Magnetometer survey and 16 d.d. holes by Trent River Iron Limited.
Province: Grenville
Subprovince: Central Metasedimentary Belt
Terrane: Elzevir
Domain: Belmont
Geological Age: Mesoproterozoic
| Rock Type | Rank | Composition | Texture | Relationship | Gabbro | 1 | From Andesite To Gabbro And Trap | Chloritization, Brecciation And Shearing | Host |
|---|---|---|---|---|
| Conglomerate | 2 | Adjacent |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Magnetite | Economic | Ore | ||||
| 1 | Hematite | Economic | Gangue | ||||
| 2 | Pyrite | Economic | Gangue | ||||
| 3 | Pyrrhotite | Economic | Gangue | ||||
| 4 | Chalcopyrite | Economic | Gangue |
Dec 07, 2005 (D Laidlaw) - Magnetite as disseminations or bands in marble, breccia and gabbro-diorite, overlain by 100 to 150 feet of Paleozoic limestone. Some pyrite, pyrrhotite, chalcopyrite, and hematite present (MDC011, p. 282).
Mar 22, 2024 (Therese Pettigrew) - The magnetite occurrence is only known from drill core, with 15 DDH having been drilled. The first hole intersected a magnetite zone at a depth of about 85 feet directly below the basal Paleozoic conglomerate. An assemblage of andesites to gabbro occur with varying degrees of chloritization, brecciation and shearing. Magnetite is disseminated in the gabbro-diorite as well as in disseminations, stringers, and bands in propylite, breccia, and crystalline limestone. The magnetite zone appears to dip very steeply. It contains some brecciated and sheared magnetite, commonly cemented by carbonates with hematite, and seamed with serpentine veinlets locally containing chlorite and hematite. Some of the serpentine is colloform and some is polished and slickensided along shear surfaces. White asbestos fibres (chrysotile) are present in some of the serpentine. Almost all the magnetite is fine grained and contains disseminations and stringers of pyrite, pyrrhotite and chalcopyrite. Some coarse-grained magnetite forms seams in brecciated zones. Magnetite and sulphides are veined and in part replaced by red hematite in the upper part of the magnetite zone. This was noted to a depth of 90 feet in diamond drill hole No. 1, or to a depth of about 5 feet below the lightly hematite-stained Paleozoic conglomerate. A thin section of a grey, altered, igneous-looking rock in the magnetite-bearing zone shows mainly fibres and flakes of grey serpentine with brownish carbonate, much disseminated coarse-grained pyrite, fine-grained pyrrhotite and some magnetite. Ghost crystals and relict structures represented by serpentine, and fractured crystals of quartz, rimmed, cemented, and replaced in part by pyrite and brown carbonate, are recognizable in places. Pyrite is veined and in part replaced by fine-grained pyrrhotite, magnetite, carbonates, serpentine and epidote. In polished sections rare tiny interstitial grains of ilmenite or hematite occur with fine-grained magnetite, pyrite, pyrrhotite, chalcopyrite and gangue. In one section, fine-grained magnetite replaces schist and a band of pyrite-pyrrhotite in it. Pyrrhotite also replaces pyrite to some extent in this band (Rose, 1958).
Publication - Geology of Canada - Rreport of progress from its commencement to 1863; Geological Survey of Canada, Report of Progress 1863
Publication Number: Rep Prog 1863 Page: 676 Date: 1863
Author: Logan, W E; Murray, A; Hunt, T S; Billings, E
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/123563
Mono - Iron deposits of Ontario
Publication Number: MDC011 Page: 282 Date: 1968
Author: Shklanka R.
Publisher Name: Ontario Dept. of Mines
Location:
Publication - Iron deposits of eastern Ontario and adjoining Quebec; Geological Survey of Canada, Bulletin 45
Publication Number: GSC Bulletin 45 Page: 15-16 Date: 1958
Author: Rose, E.R.
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/100563
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