Ministry of Energy, Northern Development and Mines
Permanent Link to this Record: MDI000000002389| Deposit Name(s) | Armstrong-johnson - 1995, Berry Zone - 1996, Ty Zone - 1996 |
|---|---|
| Deposit Status | occurrence |
| Date Created | 2020-Mar-30 |
| Date Last Modified | 2020-Mar-30 |
| Created By | T Pettigrew |
| Revised By | T Pettigrew |
Primary Commodities: gold
Secondary Commodities: copper, nickel
Township or Area: Fourbay Lake Area
Latitude: 50° 1' 49.74" Longitude: -90° 54' 34.83"
UTM Zone: 15 Easting: 649707 Northing: 5544113 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52J02SW
Point Location Description: DDH shown on map in Assessment report 52J02SW0007
Location Method: based on assessment
Access Description: The property is reached by heading E-SE along the Six Mile Road, then E-SE along an abandoned logging road for about 6 miles. The remaining 1.8 miles to the property can be covered easily on foot, all-terrain vehicle or 4x4 truck (mainly during the dry summer) along a well-established drill road.
1994-95: G. Armstrong, S. Johnson, and W. Reed drilled 6 DDH totaling 143.26 m. 1996: carried out prospecting, stripping, trenching, and drilled 7 DDH totaling 287.1 m.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| W9530-00027 | 52J02SW0007 | Open |
| 2.16878 | 52J02SW0021 | Open Open |
Province: Superior
Subprovince: Wabigoon
Belt: Sturgeon Lake
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship |
|---|---|---|---|---|
| vein | 1 | quartz | host | |
| felsic intrusive | 2 | quartz porphyry dyke | adjacent | |
| mafic metavolcanics | 3 | pillowed to massive | contains |
03/30/2020 (T Pettigrew) - The Armstrong-Johnson property is primarily underlain by pillowed to massive mafic metavolcanics rocks of the lower Pillowed Mafic Unit (PMU) of the Six Mile Cycle (SMC). Intercalated within the mafic volcanic rocks are narrow (-^l ft.) units of felsic to intermediate tuff and sedimentary units of greywacke and arkosic sandstone. Foliation in the mafic volcanic rocks is generally east trending (1000) and dips range from vertical to subvertical, dipping between 85 degrees south and 80 degrees north (overturned). The pillowed unit is also highly fractured with an intense network of rusty fractures +/- quartz-carbonate veinlets and stringers (Assessment report 52J02SW0021).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Habit Description |
|---|---|---|---|---|---|---|---|
| 1 | gold | economic | ore | ||||
| 2 | pyrrhotite | economic | ore | ||||
| 3 | chalcopyrite | economic | ore | ||||
| 4 | marcasite | economic | ore | ||||
| 5 | pyrite | economic | ore | ||||
| 1 | quartz | economic | gangue |
03/30/2020 (T Pettigrew) - At surface, the exposed quartz vein, called the Berry Zone, was up to five feet thick and it contained specks of visible gold at the southeast end. This exposed vein follows a strong northeast-trending fault-shear zone. A quartz porphyry dyke intrusion follows alongside the vein at surface. These closely spaced drill holes indicate that the exposed quartz vein and the adjoining quartz-porphyry are flat lying cigar shaped structures. The vein did not extend down-dip to the 25 ft. horizon. Two significant intersections were obtained, one in drill hole A-3 which intersected a 5 in. grey quartz vein with streaks of pyrite-marcasite that assayed 0.511 oz/t Au over 0.7 feet. Drill hole A-6 intersected a grey quartz vein with heavy streaks of pyrite-marcasite that assayed 0.306 oz/t Au over 1.0 feet. These two drill hole intersections do not appear to correlate directly with the exposed vein at surface but they are located alongside the strong fault-shear (Assessment report 52J02SW0007). Extending northeast from the Berry Zone is a relatively narrow (generally <3 ft wide and narrowing to <3 in. wide northward) shear zone. The 1996 drill program focused on the TY Zone, an east-west trending shear zone located about 30 m northwest of the Berry Zone. The TY Zone was exposed for a minimum width of 10 feet (3 m) in a pit. Most of the gold reported in this area is associated with blue-grey to black quartz veining and for the most part this proves to hold true for this property. However, some of the mineralization is associated with alteration around pillow selvedges in conjunction with quartz-carbonate veinlets and sheared blue-grey quartz veins. Also, there appears to be a positive association between the presence of gold and sulphides. The presence of disseminated and bleb (po > cpy) sulphides (1% average) were noted throughout nearly all of the host mafic volcanic rocks. Near semi-massive (25%) to semi-massive (40%) stringers and veins of sulphides (po > cpy >> py) occur as concentrations along altered pillow selvedges. These sulphide-rich alteration zones are commonly associated with epidotization and quartz-carbonate veinlets that may or may not be intensely sheared. Areas that have become sheared generally contain > 40% sulphides along with sheared blue-grey quartz veins. Assays from the sulphide-rich alteration zones are all relatively low, averaging 403 ppm Cu, 83 ppm Zn, and 112 ppm Ni. The best Cu value was returned from DDK TY-02 (sample 0090 - from 99'08" to 100’01"; 0.23' true width) at 1690 ppm. The best Ni value was also returned from DDK TY-02 (sample 0079 - from 73'08" to 74'02"; 0.28' true width) at 168 ppm. DDH TY-02 returned up to 0.113 oz/t Au (3.51 g/t Au) over 0.47 m (Assessment report 52J02SW0021).
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