Ministry of Energy, Northern Development and Mines
Permanent Link to this Record: MDI000000002299| Deposit Name(s) | Megan-hurd - 1950 |
|---|---|
| Deposit Status | occurrence |
| Date Created | 2019-Jun-27 |
| Date Last Modified | 2019-Jun-27 |
| Created By | T Pettigrew |
| Revised By | T Pettigrew |
Primary Commodities: gold
Township or Area: Maun Lake Area
Latitude: 50° 27' 39.46" Longitude: -86° 58' 17.6"
UTM Zone: 16 Easting: 502019 Northing: 5589885 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 42L07NW
Point Location Description: From assessment files
Location Method: data compilation
1950s: Tombill Mines Ltd. and Lake Osu Mines Ltd. carried out trenching. Lake Osu Mines drilled 5 DDH totaling 548.64 m. 1984: Lacana carried out magnetometer and VLF-EM surveys, prospecting and sampling. 2017: R. Hodgson conducted prospecting and sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 63.4520 | 42L07NW0006 | Open |
| 11 | 42L07NW0010 | Open |
| 2.58421 | 20000015578 | Open |
Province: Superior
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship |
|---|---|---|---|---|
| intermediate intrusive | 1 | granodiorite | host | |
| mafic metavolcanics | 2 | |||
| porphyry | 3 | quartz-feldspar |
06/27/2019 (T Pettigrew) - Northeasterly-striking mafic volcanics are intruded by semi-concordant plugs of granodiorite and fine felsite. A NNE-trending shear zone of variable width cross-cuts the intrusives and volcanic stratigraphy (Assessment report 42L07NW0006).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Habit Description |
|---|---|---|---|---|---|---|---|
| 1 | arsenopyrite | economic | ore | ||||
| 2 | pyrite | economic | ore | ||||
| 3 | chalcopyrite | economic | ore | ||||
| 4 | pyrrhotite | economic | ore | ||||
| 5 | galena | economic | ore |
06/27/2019 (T Pettigrew) - The showing is characterized by sulphide-rich quartz veins with gold in narrow shear zones cutting granodiorite and basalt flows. A large number of trenches occur on the western end of the shear. In this area, the shear cuts granodiorite and contains quartz veins up to 0.6 m wide, locally with up to 20% arsenopyrite, pyrite, chalcopyrite and pyrrhotite and wall rock silicification and sericitization. Lacana sampled all of the historic trenches. The most sulphide-rich sample yielded 0.43 oz/ton Au (13.4 gpt Au; main showing), and another close by, 0.173 oz/ton Au (5.4 gpt Au). Other values within 122 m of these ranged from 100 ppb Au to 0.053 oz/ton Au (1.65 gpt Au). Trenches further to the east, where the shear cuts mafic volcanics, yielded gold values from 100 ppb to 0.05 oz/ton Au (1.56 gpt Au) (Assessment file 42L07NW0006). At NAD83 UTM Zone 15 501613 m E 5589882 m N, a 30 cm thick chert bed containing 15% pyrite is hosted by felsic breccia and quartz-feldspar porphyry and assayed 447 ppb Au and 6039 ppm As. At NAD83 UTM Zone 15 50219 m E 5589950 m N, a narrow quartz vein is hosted by quartz-feldspar porphyry. Gold was found in vein material (449 ppb) but the surrounding quartz-feldspar porphyry assayed 2104 ppb Au and 986 ppb Au. A third occurrence located 200 m east at UTM Zone 15 502272 m E 5589797 N in a historic pit contains massive pyrite, arsenopyrite, chalcopyrite, and galena in both a quartz vein and the surrounding material. Four samples assayed 1297, 1516, 1545, and 2334 ppb Au (Assessment report 20000015578).
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