Ontario Geological Survey
Permanent Link to this Record:
MDI41O16NW00029
| Record Name(s) | Jacobs - 1935, Ajax Occurence - 1991, Horwood Syndicate - 1935 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 1992-Jul-29 |
| Date Last Modified | 2023-Mar-02 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Secondary Commodities: Copper, Lead
Township or Area: Horwood
Latitude: 47° 59' 4.41" Longitude: -82° 15' 20.58"
UTM Zone: 17 Easting: 406302.032 Northing: 5315346.961 UTM Datum: NAD83
Resident Geologist District: Timmins
NTS Grid: 41O16NW
Point Location Description: An old trench with a number of water filled pits next to an erratic.
Location Method: Field Visit with GPS
Access Description: The mineralization is located just inland from Hardiman Bay, Horwood Lake but access is easiest via the Kenogaming - Penhorwood Main Haul roads which at the southern end parallel the bay and passes within a hundred metres of the mineralization.
1935 Originally staked by W.A. Jacobs then acquired by the Horwood Exploration Syndicate. Extensive trenching at this time traced a large quartz vein for 100m along strike but only returned low gold values. 1961 Ajax Minerals mapped the area and sampled a number of quartz veins. Most of these veins contained no gold but one large vein to the south east of the Jacobs vein carried some gold. Ajax made no mention of having found the original vein. 1981 Kennco Exploration flew a magnetic and VLF-EM survey over the area. 1988 Hardiman Bay Resources carried out a geological mapping program in the area and noted some quartz veins in the same area as Ajax Minerals though the actual Jacob vein is located in a gap between two grids and was not mapped. 1980's G. Ross located the original vein and reportedly sampled the vein with no success. No records of this work are on file.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| T-2469 | 42B01SE0055 | 42B01SE0055 |
| T-2111 | 41O16NW0036 | 41O16NW0036 |
| T-3240 | 41O16NE0002 | 41O16NE0002 |
| T-3228 / 2.11828 | 42A05NE0315 | 42A05NE0315 |
Province: Superior
Subprovince: Abitibi
Terrane: Wawa-Abitibi
Belt: Swayze
Geological Age: Neoarchean Geochronological Age: 2700 MA Geochron. Age Ref.: GOO VOL 1
Metamorphism Type: Contact
Metamorphism Grade: Greenschist
Dec 07, 2005 (S Fumerton) - The vein consists of a series of a number of elliptical pods orientated to the northwest and the pods are connected by a stockwork of thin quartz - calcite - ankerite(?) veinlets. To the southeast on the same lineament (100m) there are a series of closely spaced, oblique, en-echelon quartz veins with local pods aligned on the same lineament as at the original trenches. Also there are local off-shoots parallel to the dominant foliation in the host. The controlling lineament is parallel to a series of joints with epidote alteration which are roughly perpendicular to the pluton contact.
| Rock Type | Rank | Composition | Texture | Relationship | Vein | 1 | Vein | Host |
|---|---|---|---|---|
| Mafic lava flow-unsubdivided | 2 | Basalt | Tholeiitic Mg | N/A |
| Gneiss-Unsubdivided | 3 | Amphibolite | N/A |
Dec 07, 2005 (S Fumerton) - The supracrustal rocks in the general area consist of massive and pillowed Mg tholeiitic basalts with minor amounts of intercalated pyroclastic calc-alkaline metavolcanics, particularly to the northwest. Argillaceous and arenaceous sediments are sparsely distributed within the metavolcanics, are commonly garnetiferous with disseminated pyrite, and the whole sequence has been affected by amphibolite grade contact metamorphism adjacent to the Hardiman Bay Granitic Pluton. Rocks immediately adjacent to the vein consist of a strongly foliated amphibolite gneiss.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Gangue | ||||
| 2 | Chalcopyrite | Economic | Gangue | ||||
| 3 | Pyrrhotite | Economic | Gangue | ||||
| 4 | Galena | Economic | Gangue | ||||
| Chlorite | Alteration | Chloritic | 1 | Weak | Replacement |
Dec 07, 2005 (S Fumerton) - The quartz pods in the original vein consist of fine grained milky quartz with local sections of very coarse clear quartz, and other sections with a hydraulic breccia. Within these pods there are fragments of the country rock which are chloritized and have rusty margins. The quartz carbonate stockwork connecting the pods consists of thin veins less than a centimetre thick which are zoned. Adjacent to the wall rock there are ankerite crystal (originally called red feldspar) then a mixture of quartz and clear calcite with sparsely disseminated chalcopyrite. Locally in the wall rock adjacent to the stockwork disseminated subhedral grains of pyrite form up to 5% of the rock. The en echelon quartz veins along strike to the southeast have local radiating amphibole crystals along the margins or the veins.
| Commodity | Analytical Method | Digestion Method | Result | Unit | Limit | Qualifier |
|---|---|---|---|---|---|---|
| Copper | Unknown | .0051 | % | |||
| Copper | Unknown | .0133 | % | |||
| Gold | Unknown | ppm | BDL | |||
| Gold | Unknown | ppm | BDL | |||
| Gold | Unknown | ppm | BDL | |||
| Lead | Unknown | .0056 | % | |||
| Lead | Unknown | .0031 | % | |||
| Nickel | Unknown | .002 | % | |||
| Nickel | Unknown | .0041 | % | |||
| Silver | Unknown | ppm | BDL | |||
| Silver | Unknown | .35 | ppm | |||
| Silver | Unknown | ppm | BDL | |||
| Zinc | Unknown | .0216 | % | |||
| Zinc | Unknown | .0147 | % |
| Rank | Classification |
|---|---|
| 5 | Mesothermal |
| Rank | Characteristic |
|---|---|
| 10 | Stockwork |
| 5 | Vein |
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Tabular | 100 | 1 | 155 | 90 | N/A | N/A |
Date: Jul 31, 1992
Geologist: S Fumerton
Notes: After a couple of attempts a series of old pits were found following the directions of Fred Ross. The vein contained within the pits and trenches corresponds to the description of the Jacob vein given by Harding (1937) i.e. 'Red Feldspar' to 'crystalline siderite'. The location of these workings is between 1.5 and 2km to the east northeast from the plotted location of the original claim quoted by Harding (op cit). This spread is due to the inaccuracies of the original claim map. Apparently the trenches were not found by Ajax Minerals in 1961 and this caused the misconception that an auriferous vein that they found was the original Jacob vein. Breaks (1977) plotted a showing in an outcrop on the old portage west of the stream draining Great Pike Lake. This position roughly corresponds to another description given by Harding (1937), however, no outcrop occurs in this location but numerous outcrops do occur to the east of stream.
Map - Horwood Lake, Sudbury District
Publication Number: M2329 Scale: 1:31,680 Date: 1975
Author: Breaks F.W.
Publisher Name: Ontario Division of Mines
Location:
Publication - Sudbury Timmins Algoma Mineral Program, Project 1: mineral inventory of the Sudbury-Timmins-Sault Ste. Marie region, Ontario
Publication Number: GSC OF 1087 Date: 1985
Author: Rose, D.G.
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/129999
Map - Geology, Swayze greenstone belt, Rush Lake, Ontario
Publication Number: OF3384c Scale: 1:50,000 Date: 1999
Author: Heather, K B; Shore, G T
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/210451
Part - Geology of the Horwood Lake area
Publication Number: ARV46-02 Page: 22 Date: 1997
Author: Harding W.D.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Geology, Swayze Greenstone Belt, Ontario [legend and figures]
Publication Number: OF 3384A Date: 1999
Author: Heather, K B; Shore, G T
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/210446
MonoMap - Geology of the Horwood Lake Area, Sudbury District
Publication Number: R169 Page: 44 Date: 1978
Author: Breaks F.W.
Publisher Name: Ontario Geological Survey
Location:
File - Resident Geologist files 1946, air photo
Publication Number: Date: 1996
Author:
Publisher Name:
Location:
MonoMap - Geology of the Chapleau area, districts of Algoma, Sudbury, and Cochrane
Publication Number: R157 Date: 1977
Author: Thurston P.C., Siragusa G.M., Sage R.P.
Publisher Name: Ontario Division of Mines
Location:
Mono - Gold deposits of Ontario, part 2, part of District of Cochrane, districts of Muskoka, Nipissing, Parry Sound, Sudbury, Timiskaming, and counties of southern Ontario
Publication Number: MDC018 Page: 104 Date: 1979
Author: Gordon J.B., Lovell H.L., de Grijs J.W., Davie R.F.
Publisher Name: Ontario Geological Survey
Location:
MonoMap - Mineral Prospects of the Swayze Greenstone Belt (Volume 1, Parts of NTS 41 O and Volume 2, Parts of NTS 41 P, 42 A and 42 B)
Publication Number: OFR5912 Page: 281-283 Date: 1995
Author: Fumerton S.L., Houle K.A.
Publisher Name: Ontario Geological Survey
Location:
Book - Horwood Township - unpublished GDIF
Publication Number: GDIF Date: 1990
Author: Resident Geologist Staff
Publisher Name:
Location: Timmins RGP
Map - Geology, Swayze greenstone belt, Rollo Lake, Ontario
Publication Number: OF 3384b Scale: 1:50,000 Date: 1999
Author: Heather, K B; Shore, G T
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/210450
We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.
Please review our Terms of Use agreement for this data product.
For detailed information regarding this mineral record please contact the Timmins Resident Geologist District Office