Ministry of Energy, Northern Development and Mines
Permanent Link to this Record: MDI000000000528| Deposit Name(s) | Romios Copper-gold Zone - 1998 |
|---|---|
| Deposit Status | prospect |
| Date Created | 2008-Mar-19 |
| Date Last Modified | 2019-Jun-13 |
| Created By | M A Puumala |
| Revised By | T Pettigrew |
Primary Commodities: copper, silver, gold
Township or Area: Akow Lake Area
Latitude: 52° 46' 42.13" Longitude: -90° 28' 38.3"
UTM Zone: 15 Easting: 670150 Northing: 5850600 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 53B16SW
Point Location Description: ddh database - approximate centre of mineralized zone
Location Method: data compilation
1982: Cominco Ltd. carried out overburden drilling of 61 holes totalling 230.1 m. 1996: Romios Gold Resources Inc. flew a helicopter-borne magnetic survey. 1997: Romios conducted a ground magnetometer and EM survey. 1998: Romios conducted drilling and discovered the Copper-Gold Zone in DDH 98-9. 1999: Romios drilled 5 DDH totalling 943.75 m. 2003: Romios carried out a TEM geophysical survey. 2014: Romios flew airborne VTEM and magnetic gradiometer surveys. 2016: Romios drilled 4 DDH totalling 1826 m.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 53B09NW0018 | 53B16SW0005 | Open |
| 2.20391 | 53B16SW2004 | Open |
| 2.57819 | 20000013572 | Open |
Province: Superior
Subprovince: Sachigo
Belt: North Caribou
Terrane: North Caribou
Geological Age: Mesoarchean
Tectonic Assemblage: McGruer (south Rim) - Eyapamikama Boundary
| Structure Name | Scale | Strike | Dip | Trend | Plunge |
|---|---|---|---|---|---|
| Romios Shear Zone | local | 340 |
| Rock Type | Rank | Composition | Texture | Relationship |
|---|---|---|---|---|
| mafic metavolcanics | 1 | adjacent | ||
| metasedimentary | 2 | adjacent | ||
| schist | 3 | biotite-staurolite-garnet-sericite schist | host |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Habit Description |
|---|---|---|---|---|---|---|---|
| 1 | chalcopyrite | economic | ore | ||||
| 2 | pyrrhotite | economic | ore | ||||
| 3 | arsenopyrite | economic | ore | ||||
| garnet | alteration | garnetization | 1 | unknown | disseminated | ||
| tourmaline | alteration | tourmalinization | 2 | unknown | disseminated |
03/19/2008 (M A Puumala) - This zone of anomalous gold and copper mineralization is described by Zhang (1999) as being associated with a garnetiferous unit that occurs within a major north-northwest-striking deformation zone referred to as the Romios shear zone. This mineralized shear zone is located approximately at the boundary between the mafic metavolcanic-dominated South Rim unit of the McGruer assemblage to the west and the clastic metasedimentary rock-dominated Eyapamikama assemblage to the east (Thurston, Osmani and Stone 1991). The mineralized garnetiferous horizon is intensely sheared and fractured, and contains significant pyrrhotite and chalcopyrite mineralization (Zhang 1999). Diamond drilling is reported by Zhang (1999) to have outlined an approximately 100 m wide shear zone that contains numerous narrow zones of copper and gold mineralization over a strike length of 1000 m. These heavily-mineralized zones are typically 15 to 85 cm wide. Some notable assay results reported from this zone include: 1.7% Cu and 0.9 g/t Au over 0.4 m in drill hole RGRI-99-2; 2.5% Cu and 1.4 g/t Au over 0.21 m, and 0.7% Cu and 3.4 g/t Au over 0.8 m from drill hole RGRI-99-3; 0.5% Cu and 3.9 g/t Au over 0.84 m, and 2.3% Cu and 1.8 g/t Au over 0.3 m from drill hole RGRI-99-4; and 0.4% Cu and 0.9 g/t Au over 0.4 m from drill hole RGRI-99-5.
06/13/2019 (T Pettigrew) - Mineralization is typically found within pervasively and strongly altered biotite-staurolite-garnet+/-sericite schists and is commonly proximal to hydrothermal veins of massive biotite with varying % of coarse-grained garnets and medium-grained staurolite. These veins range from a few centimetres to a few tens of centimetres in width and frequently contain veinlets of massive chalcopyrite +/- pyrrhotite with local arsenopyrite concentrations along their margins. As was particularly evident in hole RGR-16-4, the chalcopyrite coatings/seams along the foliation planes are often concentrated within 1 m of the hydrothermal veins. The presence of several metres of tourmalinite rich rocks and veins of tourmalinite with Cp-Po-(Asp) mineralization in hole RGR-16-2 is of particular significance. Tourmalinite such as this (massive fine-grained tourmaline resembling black chert) is typically a product of hydrothermal fluid flow or perhaps a hot spring setting in a marine setting. DDH RGR-16-1 returned results of 0.22% Cu and 0.1 g/t Au over 14.8 m, with the highest assays reaching 1.1 g/t Au and 1.31% Cu. DDH RGR-16-2 returned 0.21% Cu over 14.35 m and 0.31% Cu over 6.55 m. DDH RGR-16-4 returned 0.32% Cu and 183 ppb Au over 10.75 m. Drilling of the zone has revealed a >1.5 km long alteration zone, with mineralization scattered throughout (Assessment file 20000013572).
| Rank | Classification |
|---|---|
| 1 | vein (polymetallic) |
| Rank | Characteristic |
|---|---|
| 1 | sheared |
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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