Ontario Geological Survey
Permanent Link to this Record:
MDI41P12NE00004
| Record Name(s) | Tasmijopen Claim S 24319 - 1933, Pensyl Lake Iron - 1968, Siragusa #93 - 1993 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1994-May-17 |
| Date Last Modified | 2023-Mar-16 |
| Created By | |
| Revised By |
Primary Commodities: Gold, Silver
Secondary Commodities: Copper, Zinc
Township or Area: Groves
Latitude: 47° 36' 40.43" Longitude: -81° 39' 45.25"
UTM Zone: 17 Easting: 450205.17 Northing: 5273304.31 UTM Datum: NAD83
Resident Geologist District: Timmins
NTS Grid: 41P12NE
Point Location Description: Trenching and stripping of iron formation along southeast shore of Pensyl Lake.
Location Method: Data Compilation
Access Description: The easiest access, other than flying to Pensyl Lake, is to take a boat to the southern end of Mininakwa Lake from Gogama. An inlet exits to the east of Gervais Island which will take you within about 200m of the CNR railway line. The showing is about a 3 km traverse east of the railway line to Pensyl Lake.
1933: The Tasmijopen syndicate held a block of 12 claims around Pensyl Lake and conducted a program of stripping and diamond drilling concentrating mainly on a sulphide rich cherty iron formation. 1985: Blue Falcon Mines conducted an airborne magnetic and electromagnetic survey over an area that include the showing. 1984-86: Canadian Gold Resources Inc. conducted a program of ground magnetic and electromagnetic geophysics. The geophysical survey was followed by a drill program involving 6 holes for a total depth of 638 m. The drill program was conducted in and around Pensyl Lake testing geophysical anomalies and mineralized zones at depth. The drill program failed to return any economically significant assays. 1997-99: Anderson, S.D. – Assays, Pr. 2008: Liberty Mines Inc. – AEM, AMag.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| T-3067 / | 41P12SE0517 | 41P12SE0517 |
| T-3067 / | 41P12SE0518 | 41P12SE0518 |
| T-6028 / 2.42478 | 20000004214 | 20000004214 |
| T-2357 / 2.3559 | 41O09NW9161 | 41O09NW9161 |
| T-4321 / 2.19724 | 41P12NE2001 | 41P12NE2001 |
Province: Superior
Subprovince: Abitibi
Terrane: Wawa-Abitibi
Belt: Swayze
Tectonic Assemblage: Ridout
Geological Age: Neoarchean Geochronological Age: 2705 MA Geochron. Age Ref.: GOO VOL 1
Metamorphism Type: Regional
Metamorphism Grade: Greenschist
Dec 07, 2005 (K Houle) - The iron formation showing strikes at N 85 E and dips steeply to the north. The mineralized band was exposed circa 1933 for a strike length of 30' (9.14 m) and a surface width of 25' (7.62 m). The second showing of a sugary/cherty quartz vein is reported to strike at N 86 E which was stripped circa 1933 for a length of 25' (7.62 m) and a width of 9' (2.74 m). The quartz vein to the north of the iron formation is said to strike at S 81 E and dips 80 N.
| Rock Type | Rank | Composition | Texture | Relationship | Ironstone-unsubdivided | 1 | Banded Iron Formation | Host |
|---|---|---|---|---|
| Terrigenous-Clastic-Unsubdivided | 2 | Greywacke | Adjacent | |
| Vein | 3 | Quartz | Contains |
Dec 07, 2005 (K Houle) - A gold showing, is reported to occur within a band of cherty iron formation in contact with a greywacke. The mineralized portion of the iron formation is reported to be 5 feet (1.52 m) wide with narrow bands of cherty material alternating with sulphide layers. A few samples taken from a pitted portion of the mineralized ironstone are reported to have yielded anomalous gold values in the range of 0.25-0.50 oz./ton. Another showing, about 180 m west, is described as a sugary/cherty quartz vein with sections 'strongly impregnated with fine sulphides'. A core sample at 20' from a shallow hole under this vein is reported to have assayed 0.15 oz./t Au and 0.15 oz./ton Ag. A quartz vein within the greywacke is also said to occur about 100' (30.5 m) to the north of the iron formation. The vein is reported to be about 1' (30.5 cm) wide with a strike length of about 40' (12.19 m) and hosts sulphide mineralization with associated anomalous gold values. A 1933 grab sample from this vein is said to have contained 0.50 oz./ton Au and 2.5 oz./ton Ag.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Chalcopyrite | Economic | Ore | ||||
| 2 | Sphalerite | Economic | Ore | ||||
| 1 | Pyrite | Economic | Gangue | ||||
| 2 | Pyrrhotite | Economic | Gangue | ||||
| 3 | Arsenopyrite | Economic | Gangue | ||||
| Hematite | Alteration | Unknown | 1 | Strong | Replacement |
Dec 07, 2005 (K Houle) - Mineralization within the iron formation consists predominantly of pyrite with secondary amounts of pyrrhotite, chalcopyrite, arsenopyrite and sphalerite. It has been reported that magnetite has been seen to be replaced by pyrrhotite. The highly anomalous gold values of 0.25 to 0.50 oz./t were observed in a test pit and were said to be associated with samples of arsenopyrite (Laird, 1933). Within the iron formation pyrite and pyrrhotite occur as disseminations and local massive and semi massive stringers of a few mm width interlayered with magnetite and ferruginous chert (Siragusa, 1993).
| Rank | Classification |
|---|---|
| 1 | Sedimentary |
| Rank | Characteristic |
|---|---|
| 1 | Stratiform |
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Unknown | 7.6 | 2.7 | 265 | N/A | N/A |
Book - Sudbury Timmins Algoma Mineral Program, Project 1: mineral inventory of the Sudbury-Timmins-Sault Ste. Marie region, Ontario
Publication Number: GSC OF 1087 Page: 41P-59 Date: 1985
Author: Rose, D. G.
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/129999
File - Resident Geologist file T-3067 (OM85-5P-260)
Publication Number: Date:
Author:
Publisher Name:
Location: Timmins RGP office
Map - Geological series, Precambrian geology of Pensyl Lake area, Sudbury District
Publication Number: P2534 Scale: 1:15,840 Date: 1982
Author: Siragusa G.M.
Publisher Name: Ontario Geological Survey
Location:
Map - Precambrian Geology, Parts of Champagne, Groves, St. Louis and Benneweis Townships
Publication Number: OFM0209 Scale: 1:15,840 Date: 1993
Author: Siragusa G.M.
Publisher Name: Ontario Geological Survey
Location:
Part - Geology of the Makwa-Churchill area
Publication Number: ARV43-03.002 Page: 65-66 Date: 1998
Author: Laird H.C.
Publisher Name: Ontario Dept. 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: 102 Date: 1979
Author: Gordon J.B., Lovell H.L., de Grijs J.W., Davie R.F.
Publisher Name: Ontario Geological Survey
Location:
Mono - Copper, nickel, lead and zinc deposits in Ontario (revised to February, 1957)
Publication Number: MDC002 Date: 1957
Author: Thomson J.E., Ferguson S.A., Johnston W.G.Q., Pye E.G., Savage W.S., Thomson R.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Iron deposits of Ontario
Publication Number: MDC011 Date: 1968
Author: Shklanka R.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Copper, nickel, lead and zinc deposits of Ontario
Publication Number: MDC012 Page: 277 Date: 1969
Author: Shklanka R.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Peat and peatland evaluation of the Parry Sound area, volumes 1 to 5
Publication Number: OFR5488 Page: 117-118 Date: 1984
Author: Monenco Ontario Ltd.
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: 382-383 Date: 1995
Author: Fumerton S.L., Houle K.A.
Publisher Name: Ontario Geological Survey
Location:
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