Ministry of Energy, Northern Development and Mines
Permanent Link to this Record: MDI000000000509| Deposit Name(s) | Bottenfield Bay - 1985 |
|---|---|
| Deposit Status | occurrence |
| Date Created | 2008-Mar-17 |
| Date Last Modified | 2019-Sep-11 |
| Created By | M A Puumala |
| Revised By | T Pettigrew |
Primary Commodities: gold
Secondary Commodities: copper, zinc
Township or Area: Zeemel Lake Area
Latitude: 52° 35' 21.82" Longitude: -90° 25' 44.82"
UTM Zone: 15 Easting: 674150 Northing: 5829700 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 53B09SW
Point Location Description: Assessment file map and ddh database
Location Method: data compilation
1985: Dome Mines Group conducted mapping and sampling and drilled 2 DDH totalling 1999: Placer Dome Inc. carried out magnetics and VLF-EM surveys.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 31 | 53B09SW9421 | Open |
| 53A05NW0010 | 53A05NW0032 | Open |
| 53B09SW0015 | 20000006242 | Open |
| 63.4743 | 53B09NW0002 | Open |
| 2.20152 | 53B09NW2003 | Open |
Province: Superior
Subprovince: Sachigo
Belt: North Caribou
Terrane: North Caribou
Geological Age: Mesoarchean
Tectonic Assemblage: McGruer - Opapimiskan Unit
| Structure Name | Scale | Strike | Dip | Trend | Plunge |
|---|---|---|---|---|---|
| Fold Axial Plane | local | 315 | |||
| Iron Formation | local | 0 |
| Rock Type | Rank | Composition | Texture | Relationship |
|---|---|---|---|---|
| iron formation | 1 | chert-magnetite-grunerite | host | |
| mafic metavolcanics | 2 | adjacent |
| 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 | ||||
| 4 | arsenopyrite | economic | ore | ||||
| 5 | sphalerite | economic | ore | ||||
| grunerite | alteration | amphibolitization | 1 | unknown | disseminated | ||
| carbonate | alteration | carbonatization | 2 | unknown | disseminated |
03/17/2008 (M A Puumala) - This occurrence is based on the results of diamond drilling that was carried out to test the Musselwhite northern and southern iron formations in the Bottenfield Bay area of Opapimiskan Lake (Rigg 1985). The southern iron formation was intersected by Dome Exploration diamond drill hole MUS 326, while the northern iron formation horizon was tested by drill hole MUS 327A. Rigg (1985) reported that drill hole MUS 326 intersected banded chert-grunerite (+/- magnetite-carbonate) iron formation that exhibited localized strong gruneritization or carbonatization. The iron formation dips to the west, and has been folded, with the fold axial planes dipping steeply to the northeast and hinges plunging moderately to the northwest. Rigg (1985) reported that the iron formation contains weak sulphide mineralization (including pyrrhotite, pyrite and arsenopyrite), with the most notable assay being 1.50 g/t Au over 4.90 m. Rigg (1985) also reported that the lower contact of the iron formation with mafic metavolcanic rocks is marked by a non-auriferous sulphide facies (pyrrhotite) iron formation mineralized with 0.5% chalcopyrite and 1% sphalerite. Rigg (1985) described the northern iron formation stratigraphy that was encountered in drill hole 327A as consisting of (from west to east) chert-magnetite iron formation similar to the Musselwhite West Anticline upper iron formation, mafic to ultramafic metavolcanics, chert-magnetite-grunerite iron formation similar to the Musselwhite middle iron formation, chert-grunerite-magnetite-carbonate iron formation with sulphide-rich iron formation along the lower contact (similar to iron formation horizon encountered in MUS 326), and mafic to ultramafic metavolcanics. The chert-magnetite-grunerite unit (middle iron formation) was reported to contain low, but anomalous gold values (Rigg 1985). The most notable assay reported from drill hole MUS 327A was 0.686 g/t over 1.5 m from a section of iron formation containing stringer sulphides (pyrrhotite + pyrite) and a quartz vein mineralized with approximately 2% pyrrhotite. Rigg (1985) reported a higher intensity of deformation in this drill hole than at MUS 326, with fold axial planes reported to dip steeply to the east, subparallel to bedding. During a 1992 diamond drilling program, Placer Dome reported anomalous gold assays from two diamond drill holes (MUS 609A and MUS 610) that were advanced at locations approximately 1000 m and 1400 m north-northwest of MUS 326 (AFRI# 53B09SW9421). These drill holes were advanced approximately along strike from MUS 326 and 327A to test structures (faults and folds) associated with the Musselwhite southern iron formation. The most notable assay reported from drill hole MUS 609A was 0.530 g/t Au over 1.0 m in chert-magnetite iron formation mineralized with stringer pyrrhotite, while an assay of 0.810 g/t Au was reported from a 1.0 m section of contorted chert-magnetite iron formation mineralized with minor pyrrhotite (AFRI# 53B09SW9421).
09/11/2019 (T Pettigrew) - A chip sample cut through the amphibole-garnet-biotite iron formation at L176+00S, 142+50W yielded 1.37 g/t Au over 4.57 m. At L76S, 72W, a rusty regolith sample taken from an iron formation outcrop yielded 3400 ppb Au (Assessment report 53B09NW0002).
| Rank | Classification |
|---|---|
| 1 | lode (gold) |
| Rank | Characteristic |
|---|---|
| 1 | stratabound |
| 2 | vein |
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