Ontario Geological Survey
Permanent Link to this Record:
MDI42C12NW00029
| Record Name(s) | Franco-Nevada Hemlo Project - 1990, Interlake - 1982 |
|---|---|
| Related Record Type | Partial |
| Related Record(s) | |
| Record Status | Producing Mine |
| Date Created | 1985-May-16 |
| Date Last Modified | 2022-Mar-28 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Secondary Commodities: Barite, Molybdenum
Township or Area: Bomby
Latitude: 48° 42' 25.17" Longitude: -85° 55' 51.8"
UTM Zone: 16 Easting: 578642.3 Northing: 5395435.56 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42C12NW
Point Location Description: Underground drifts from the Williams Mine
Location Method: Conversion from MDI
Access Description: Approx. 35 km east of Marathon and 50 km south of Manitouwadge, Ontario. Highway 17 bisects the area in an east-west direction and provides the best access to the area. The main CP line also traverses the area and roughly parallels the highway within about 1km to the south.
1982: VLF-EM, MAG done by Interlake. 1983: Major Drilling program begun with Teck and Noranda. 1984: 17 shallow drill holes approx. 2200 m drilled by Interlake. 1984: TECK - MAG, AEM, 30 shallow drill holes 1984 Gold encountered in IL-2 @ 5459 feet. 2 new deep drill holes planned IL-3 and IL-4 @ 6500 ft each. 1985: TECK reduces option to minority interest (22%). 1989: TECK and Hemlo Gold Mines (Noranda) terminate option. 1990: Franco-Nevada purchases 100% interest in Interlake claims. 1997: Franco-Nevada undertook a $2.9 million Phase 1 underground exploration. 2000 foot underground drift and 4 drill stations established. 21 hole, 33,000 foot drilling program completed. 1998: Contract work to extend drift 1300 feet and add 3 additional drill stations. 2008: Mining began on the property. Barrick is the operator and manages both the open-pit and underground operations. Franco-Nevada has both a 3% NSR royalty and a 50% NPI royalty on a portion of the western down-dip underground extension of the Hemlo ore body. Production for the mine is recorded in MDI42C12NW00005.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 63.4447 | 42C12NW0029 | 42C12NW0029 |
| 25 | 42C12NW0098 | 42C12NW0098 |
| 2.4983 | 42C12NW0153 | 42C12NW0153 |
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Belt: Schreiber-Hemlo
Geological Age: Neoarchean
Metamorphism Type: Shear
Metamorphism Grade: Amphibolite
Dec 07, 2005 (Q Unknown) - The most significant rock types underlying the Hemlo area ppaer to be a series of intercalated mafic lava flows and associated mafic pyroclastic horizons, intermediate to felsic volcanics, mainly pyroclastics, and thin to thickly laminated clastic wackes, siltstones, argillites, etc., mainly derived from volcanic source areas. These rocks strike generally east-west and dip steeply north. Medium grade metamorphism has sufficiently atlered these forrmations so that no good realiable top determination could be made. The northwest, southwest, northeast, and southcentral-southeast parts of the Hemlo map area are underlain by granitoid plutons and related gnessic assemblages. Porphyry dikes and sills cut the earlier rocks of the area. what has been termed locally 'The Lake Superior Shear Zone', has been better defined by diamond drilling on the 'Corona' property and is a seritizied and silicified agglomeratic tuff horizon slightly sheared and parallel to the bedding. Numerous more or less pronounced topographic lineaments similar to the 'Lake Superior Shear Zone' criss-cross the region in a variety of directions, and some of these may represtn the surface expressions of underlying fault or shear zones.
| Rock Type | Rank | Composition | Texture | Relationship | Terrigenous-Clastic-Unsubdivided | 1 |
|---|
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Gold | Economic | Ore | ||||
| 2 | Molybdenite | Economic | Ore | ||||
| 3 | Pyrite | Economic | Ore | ||||
| 4 | Pyrrhotite | Economic | Ore | ||||
| Albite | Alteration | Feldspathization | 1 | Unknown | Disseminated | ||
| Microcline | Alteration | Feldspathization | 2 | Unknown | Disseminated | ||
| Sericite | Alteration | Sericitization | 3 | Unknown | Disseminated | ||
| Biotite | Alteration | Biotitic | 4 | Unknown | Disseminated | ||
| Silicate | Alteration | Silicification | 5 | Unknown | Disseminated | ||
| Carbonate | Alteration | Carbonatization | 6 | Unknown | Disseminated | ||
| Tourmaline | Alteration | Tourmalinization | 7 | Unknown | Disseminated | ||
| Pyrite | Alteration | Pyritic | 8 | Unknown | Disseminated |
Dec 07, 2005 (Q Unknown) - Mineralization in the area commonly noted consists of scattered pyrite and local concentrations of magnetite. Trace amounts of sphalerite, chalcopyrite and molybdenite have been noted. Within the gold bearing zones drilled by Corona Resources Ltd. native gold is commonly observed as an alteration within the quartz-sericite zones and very minor amounts of tourmaline can be seen within the occasional quartz fractures.
Dec 07, 2005 (Q Unknown) - One of the greatest difficulties is distinguishing between 1) unaltered and altered rocks; 2) alteration directly associated with the Hemlo gold deposit and alteration from other events (eg. intrusions, metamorphism); and 3) relative ages of types of alteration.
| Zone | Year | Category | Tonnes | Reference | Comments | Commodities |
|---|---|---|---|---|---|---|
| Franco-Nevada | 2000 | Unclassified | 10800000 | Franco-Nevada 2000 Annual Report | 2,328,000 oz Au | Gold 0.216 Ounce per Ton |
| SURFACE DRILING | 1988 | Possible | 2900000 | NMI FILE, 42C/12 AU | Gold 12 Grams per Tonne |
MonoMap - Geology of the Hemlo area, District of Thunder Bay
Publication Number: R217 Scale: Date: 1982
Author: Muir T.L.
Publisher Name: Ontario Geological Survey
Location:
MonoMap - Precambrian Geology, Hemlo Gold Deposit Area
Publication Number: R289 Scale: Date: 1997
Author: Muir T.L.
Publisher Name: Ontario Geological Survey
Location:
Publication - Franco-Nevada 1997 Annual Report
Publication Number: AR1997 Scale: Date: 1997
Author: Franco-Nevada
Publisher Name:
Location: SHAREHOLDERS REPORT
Publication - Franco-Nevada 1998 Annual Report
Publication Number: AR1998 Scale: Date: 1998
Author: Franco-Nevada
Publisher Name:
Location: SHAREHOLDERS REPORT
Map - Hemlo, Thunder Bay District
Publication Number: M2452 Scale: 1:31,680 Date: 1981
Author: Muir T.L., Lafleur J.
Publisher Name: Ontario Geological Survey
Location:
Map - Geological Compilation of the Eastern Half of the Schreiber-Hemlo Greenstone Belt
Publication Number: M2614 Scale: 1:50,000 Date: 2000
Author: Muir T.L.
Publisher Name: Ontario Geological Survey
Location:
Map - Geological series, Hemlo area (northern half), District of Thunder Bay
Publication Number: P2304 Scale: 1:15,840 Date: 1979
Author: Muir T.L., Lafleur J.
Publisher Name: Ontario Geological Survey
Location:
Map - Structural Geology, Hemlo Gold Deposit Area, North-Central Part
Publication Number: P3242 Scale: 1:5,000 Date: 1993
Author: Muir T.L.
Publisher Name: Ontario Geological Survey
Location:
Map - Lithology, Hemlo Gold Deposit Area, North-Central Part
Publication Number: P3238 Scale: 1:5,000 Date: 1993
Author: Muir T.L.
Publisher Name: Ontario Geological Survey
Location:
Map - Lithology of the Hemlo gold deposit area [north-central sheet]
Publication Number: OFM0181B Scale: 1:5,000 Date: 1991
Author: Muir T.L.
Publisher Name: Ontario Geological Survey
Location:
Map - Structural geology of the Hemlo gold deposit area [north-central sheet]
Publication Number: OFM0182B Scale: 1:5,000 Date: 1991
Author: Muir T.L.
Publisher Name: Ontario Geological Survey
Location:
Map - Hemlo Gold Deposit Area, Structural Geology, North-Central Part
Publication Number: M2607 Scale: 1:5,000 Date: 1997
Author: Muir T.L.
Publisher Name: Ontario Geological Survey
Location:
Map - Hemlo Gold Deposit Area, Lithology, North-Central Part
Publication Number: M2603 Scale: 1:5,000 Date: 1997
Author: Muir T.L.
Publisher Name: Ontario Geological Survey
Location:
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