Ministry of Energy, Northern Development and Mines
Permanent Link to this Record: MDI000000002483| Deposit Name(s) | Expansion Lake Trenches 1 & 2 - 2008 |
|---|---|
| Deposit Status | occurrence |
| Date Created | 2020-Dec-18 |
| Date Last Modified | 2020-Dec-18 |
| Created By | T Pettigrew |
| Revised By | T Pettigrew |
Primary Commodities: gold
Township or Area: Rickaby
Latitude: 49° 45' 37.56" Longitude: -87° 37' 9.11"
UTM Zone: 16 Easting: 455404 Northing: 5512179 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 42E13SE
Point Location Description: Map in Assessment report 20000006225
Location Method: based on assessment
Access Description: The Expansion Lake claims can be reached by travelling along Highway 11 and turning onto the Kinghorn road. Follow the Kinghorn road to the 23 km road marker, and turn west 100 m past the marker along an abandoned logging road. Then drive approximately 10 km west to the northwest end of the property. Old forestry roads provide good access to almost all of the property areas. Most of the roads are 4x4 truck accessible, in particular the roads leading to the main Expansion Lake showings.
2008: Alto Ventures Ltd. carried out prospecting, trenching, and sampling. 2009: Alto Ventures carried out stripping, geological mapping, prospecting, and channel sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.47671 | 20000006225 | Open |
| 2.44116 | 20000004542 | Open |
Province: Superior
Subprovince: Wabigoon
Belt: Onaman
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship |
|---|---|---|---|---|
| intermediate to felsic metavolcanics | 1 | |||
| mafic to intermediate metavolcanics | 2 | |||
| intermediate intrusive | 3 | granodiorite to diorite | ||
| vein | 4 | quartz | host |
12/18/2020 (T Pettigrew) - The geology in the Expansion Lake property is mainly comprised of metavolcanics; felsic to intermediate and mafic to intermediate volcanic rocks, with small granodioritic-dioritic intrusive stocks. In the main Expansion Lake area, there is a previously unmapped dioritic intrusive stock, along the northwestern shore of Expansion Lake. It is a relatively small intrusive body, intruding into the surrounding felsic to intermediate fragmental and bedded volcanic rocks (Assessment report 20000006225).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Habit Description |
|---|---|---|---|---|---|---|---|
| 1 | pyrite | economic | ore | ||||
| 2 | chalcopyrite | economic | ore | ||||
| 1 | quartz | economic | gangue | ||||
| sericite | alteration | sericitization | 1 | unknown | disseminated | ||
| chlorite | alteration | chloritic | 2 | unknown | disseminated | ||
| carbonate | alteration | carbonatization | 3 | unknown | disseminated | ||
| epidote | alteration | epidotization | 4 | unknown | disseminated | ||
| hematite | alteration | hematization | 5 | unknown | disseminated |
12/18/2020 (T Pettigrew) - Gold, at Expansion Lake, occurs in locally folded and brecciated quartz veins and related silicified wall rock, with minor to moderate amounts of disseminated pyrite and traces of chalcopyrite. Alteration includes sericite, chlorite, carbonate, epidote, plus potassic and hematite. Mapping and sampling in 2008 identified an area near the western portion of the outcrop that yielded anomalous gold values of 706 ppb over 0.5 m (sample 745195), sampled within a quartz vein. Closer examination of the quartz veining in this trench show that there are two generations of veining occurring; an earlier series of veins aligned approximately E-NE, occurring as veinlets within sections in the diorite, and later-stage, possibly barren, veins trending more E-SE. The large vein in the western portion of the trench maps does not contain the anomalous gold value; the quartz veinlets along the contact with the vein appear to. Trench 2 is located 100 m north of Trench 1. A large, approximately 5 m wide, E-W trending shear runs through the middle of the trench with minor associated quartz veining. Samples taken on this structure show gold values above 100 ppb, with sample 745261 returning 617 ppb Au (Assessment report 20000006225).
We are continuously updating the Mineral Deposit Inventory. If you notice errors in the data please contact us.
Please review our Terms of Use agreement for this data product.
For detailed information regarding this mineral deposit please contact the Thunder Bay North Resident Geologist District Office