Ministry of Energy, Northern Development and Mines
Permanent Link to this Record: MDI000000000520| Deposit Name(s) | Alsp East Quartz Vein Zone - 1987 |
|---|---|
| Deposit Status | occurrence |
| Date Created | 2008-Mar-19 |
| Date Last Modified | 2019-Aug-28 |
| Created By | M A Puumala |
| Revised By | T Pettigrew |
Primary Commodities: gold
Township or Area: Skinner Lake Area
Latitude: 52° 43' 0.4" Longitude: -90° 24' 33.14"
UTM Zone: 15 Easting: 674989 Northing: 5843914 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 53B09NW
Point Location Description: Sample 2719 on map in Assessment report 53B09NW0001
Location Method: data compilation
1983: Canadian Nickel Company Ltd. carried out mapping. 1987: Power Explorations Inc. carried out mapping and sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.10760 | 53B09NW0001 | Open |
| 2.5613 | 53B09NW9423 | Open |
Province: Superior
Subprovince: Sachigo
Belt: North Caribou
Terrane: North Caribou
Geological Age: Mesoarchean
Tectonic Assemblage: McGruer - North Rim Unit
| Structure Name | Scale | Strike | Dip | Trend | Plunge |
|---|---|---|---|---|---|
| Concordant Veins | local | 335 | 90 | ||
| Secondary Veins | local | 60 | 90 |
| Rock Type | Rank | Composition | Texture | Relationship |
|---|---|---|---|---|
| mafic metavolcanics | 1 | contains | ||
| iron formation | 2 | chert-magnetite-grunerite | contains | |
| felsic intrusive | 3 | near |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Habit Description |
|---|---|---|---|---|---|---|---|
| 1 | pyrite | economic | ore | ||||
| 2 | pyrrhotite | economic | ore | ||||
| 3 | chalcopyrite | economic | ore | ||||
| tourmaline | alteration | tourmalinization | 1 | unknown | disseminated | ||
| graphite | alteration | graphitiic | 2 | unknown | disseminated |
03/19/2008 (M A Puumala) - Newman and Burk (1987) described the Akow Lake South Property (ALSP) East Quartz Vein Zone as an area of extensive quartz veining hosted in the North Rim metavolcanic unit (part of the McGruer assemblage of Thurston, Osmani and Stone (1991)) near the eastern margin of the North Caribou greenstone belt. The quartz veins are hosted in a sequence dominated by well-foliated pillowed and massive mafic metavolcanic flows. An approximately 1 m thick gossanous chert-magnetite-grunerite iron formation also occurs within this zone. Two sets of quartz veins were noted in this zone by Newman and Burk (1987). The dominant veins (Type I) are described as concordant (foliation in the area strikes 335 with near-vertical dip) white massive quartz veins mineralized with 1% tourmaline, trace pyrite and graphite. These veins are typically 0.9 to 1.5 m wide, but locally may attain widths of 4.5 m. The second set of veins are typically narrow (1 to 2.5 cm), closely-spaced (15 cm) veins that are oriented perpendicular to foliation (060/50). No visible sulphides are present in these veins. No occurrence-grade assays were reported from the quartz veins. However, Newman and Burk (1987) did report anomalous gold assays from mineralized mafic metavolcanics and iron formation. A grab sample of gossanous volcanic phyllite was reported to have assayed 865 ppb Au, while a 1.52 m chip sample of chalcopyrite, pyrite and pyrrhotite-bearing banded iron formation assayed 291 ppb Au.
| Rank | Classification |
|---|---|
| 1 | lode (gold) |
| Rank | Characteristic |
|---|---|
| 1 | sheared |
| 2 | vein |
Book - Northwestern Superior Province: Review and Terrane Analysis, in Geology of Ontario; Ontario Geological Survey, Special Volume 4, Part 1, p. 81-142.
Publication Number: SV04-01 Date: 1991
Author: Thurston, P.C., Osmani, I.A. and Stone, D.
Publisher Name: OGS
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