Ontario Geological Survey
Permanent Link to this Record:
MDI52F03NE00014
| Record Name(s) | Sorry Mac - Trench A - 1984 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1991-Jan-24 |
| Date Last Modified | 2022-Jul-07 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Napanee Lake Area
Latitude: 49° 8' 2.16" Longitude: -93° 6' 58.74"
UTM Zone: 15 Easting: 491515.19 Northing: 5442351.042 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52F03NE
Point Location Description: Transfer
Location Method: Conversion from MDI
Access Description: The Sorry Mac occurrences are located 75 km south-southwest of Dryden, between Hailstone Bay and Hidden Bay, on the southeast side of Manitou Stretch. Road access to the property is from Hwy 502, along the Cedar Narrows Road to the landing on the Manitou Stretch. A boat trip of about 17 km reaches the occurrences. The Sorry Mac occurrences consist of six trenches along a 1.8 km length trending northeasterly. (OFR 5731, p. 137)
1934: Thomson (1934) identified a quartz vein (now trench C) on map ARM43A during regional geological survey. 1984 - 1986: Sparton Resources conducted ground VLF-electromagnetic and magnetic surveys, a soil geochemical survey, a geological survey, and trenching and rock sampling. They exposed five mineralized sites known as trenches A to E. The best results from the sampling came from trench C where a chip sample assayed 0.344 ounce gold per ton over 1 m, and trench D where a chip sample assayed 0.355 ounce gold per ton over 1 m. Sparton Resources conducted a follow-up diamond drill program in 10 holes for a total amount of 918.4 m. Among assays recorded from the first seven holes only, the best intersection was 0.18 ounce gold per ton over 1.2 m in a hole beneath trench E. 1989: Homestake Mineral Development Co. conducted geological, ground VLF-electromagnetic, magnetic, induced polarizations and soil geochemical surveys, and re-sampled the trenches.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.13042 / 52F03NE R-6 | 52F03NE0001 | 52F03NE0001 |
Province: Superior
Subprovince: Wabigoon
Terrane: Western Wabigoon
Belt: Eagle-Wabigoon-Manitou
Geological Age: Precambrian
Feb 18, 2010 (C Ravnaas) - The geology of the area as mapped by Smith and Stephenson (1988), consists of metavolcanic and metasedimentary rocks intruded by gabbroic rocks. Mafic metavolcanic rocks are predominant. The property is widely sheared, so that the rocks are iron carbonatized and schistose. The core of the shear zone is characterized by a steeply-dipping, fissile, rock. Alteration products, in order of decreasing abundance, are dolomite, ankerite, sulphides, fuchsite, grey sericite, chlorite, calcite, and quartz veining. At least three parallel, gold-bearing, shear zones have been identified by the author over a 1.7 km length. Shearing trends approximately northeast at the Hidden Bay, but is deflected at Hailstone Bay toward the north-northeast. All the shear zones display vertical to flat dip to the northwest (90° to 25°), with moderate to steeply plunging slickenside lineations, indicating a north-side-up, oblique slip component of movement in the shear zones. The highly altered zone is about l to 10 m wide. The fissile zone, up to 3 m in width, is filled with narrow, semi-massive, bands of sulphide minerals and/or quartz veinlets. The quartz material is white to pale grey, opaque to rarely vitreous, commonly brecciated, and commonly laminated due to narrow ribbons of sericite, chlorite, calcite, ankerite, and dolomite. Tourmaline may also be present. Sulphide minerals are up to 25% arsenopyrite, up to 2% pyrite, and locally up to 2% chalcopyrite, and traces of bornite. Disseminated sulphides vary from very fine- to coarse-grained. Trench C has been opened up over a 16.25 m strike length, and displays a typical replacement-type vein, in which a gradational to more altered zone consists of fissure-filling. The alteration zonation from the south to the north is: 0-7 m: weak to moderate iron carbonatized and chloritized mafic metavolcanics. 7-7.25 m: bleached zone with 17. arsenopyrite and pyrite and traces of chalcopyrite. 7.25-10.25 m: fissile zone, characterized by pervasive ankerite and dolomite alteration. Sulphidization consists of up to 25% sulphide minerals (arsenopyrite), including a few semi-massive bands. Injection of a few concordant quartz veinlets. The host rock is strongly overprinted and masked by the alteration product. 10.25-16.25 m: zone of dolomite-fuchsite-ankerite-quartz mixed with minor wall rock remnants. The zone shows intense injection of quartz veins and quartz pods giving the outcrop a stockwork pattern. The quartz material is weakly brecciated. Analytical results of fifteen grab samples taken by the author across the area indicate a correlation between gold, and antimony and arsenic contents, and that gold is preferentially associated with the sulphidized and iron carbonatized fissile zone. The best result came from such a sample from trench C, which assayed 0.34 ounce gold per ton. (OFR 5731, p. 137-142)
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 5 | Pyrite | Economic | Ore |
Feb 18, 2010 (C Ravnaas) - Assay: 40 g/t Au over 1.0 m.
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