Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42A05NE00121

Record: MDI42A05NE00121

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Thorneloe

Latitude: 48° 21' 2.31"    Longitude: -81° 31' 16.71"

UTM Zone: 17    Easting: 461377   Northing: 5355405    UTM Datum: NAD83

Resident Geologist District: Timmins

NTS Grid: 42A05SE

Point Location Description: Approximate centre of cluster of drill holes (Golden River East zones)

Location Method: Other Literature

Access Description: Easy all weather access is provided by highway 101 and highway 144. A dirt road which follws along the north side of the Tatachikapika River provides access to the interior of the west part of the property. A dirt road off highway 144 south of the Tatachikapika River provieds access to the central portion of the east part of the Thorne property.

Exploration History

1994-2004: Band-Ore Resources Ltd. - 243 ddh ( 67,491 m), ground geophysics, airborne geophysics. 2006-2009: West Timmins Mining Corp. - airborne geophysics, DD-58. 2010-2015: Lake Shore Gold Corp. - DD-342-235 173 m, modelling, resource calculation.

Assessment Work on File

Geology

Province: Superior

Subprovince: Abitibi

Terrane: Wawa-Abitibi

Belt: Abitibi

Geological Age: Neoarchean  

Geology Comments

Feb 09, 2016 (A Wilson) - The Band-Ore Horizon lies approximately 150 m south of the Kapika Zone and lies between Band-Ore gridlines L16+45E to L60+00E. Gold mineralization is hosted by Archean-aged clastic metasediments, consisting of near vertical silstones, thickly bedded argillites, arenite and conglomerates with minor quartz-feldspar porphyries. The zone is a highly altered silicified, sericitized and carbonatized zone with pyrite and arsenopyrite mineralization. There appears to be a broad envelope of sericite ankerite alteration surrounding the gold zones with minor fuchsite, montmorillonite and quartz-ankerite veining. The Gold River Trend lies approximately 2 km north of the Destor-Porcupine Fault Zone and surrounds an east trending, steeply northward dipping contact between volcanic and sedimentary rocks. Mineralization is contained in multiple zones located immediately to the south of the contact and closely associated with quartz-feldspar porphyry dikes, dark grey quartz veining, increased pyrite/arsenopyrite and local visible gold. The mineralized zones have a minimum strike length of over 2 km and have a vertical depth of 1050 m.

Lithology

Lithology Comments

Nov 15, 2011 (A Wilson) - Gold mineralization is hosted within arsenopyrite-pyrite-ankerite-quartz veins and appears to be strongest proximal to porphyry contacts, although some mineralization occurs within sericitic and carbonate altered pyritic porphyries. Mineralized zones occur within a broad alteration deformation zone. The main zone has been subdivided into a series of sub-zones. Zones within Golden East Zone include: South Limb, Core (Plum), South Limb, Lower Fault Zone, North Porphyry system, Main Zone, Small Zone, Diabase Zone, West Zone and 4800E zone. The Gold River Trend varies from 50 to 200 metres in width and is dominated by strongly sheared and hydrothermally altered sedimentary and volcanic rocks which have been intruded by lenses of porphyry. Work to date indicates that at least 15 different zones of gold mineralization exist with potential for being defined as narrow high grade or wide bulk resources. In most cases the mineralization is closely associated with pyrite-arsenopyrite-ankerite-quartz veins.

Mineralization

Mineralization Comments

Jun 22, 2012 (A Wilson) - The gold appears to be contemporaneous with the arsenopyrite-pyrite mineralization. The gold is extremely fine-grained and is rarely observed without a microscope. Visbile gold was reported in only a few drill holes with high gold intercepts such as 2.85 g/t Au over 1m (TH-97-222), 16.0 g/t Au over 1 m in TH-97-223). Mineralization in the Thorne East Zone is subivided into the South Limb, Plum (Core) and Nose zones. Diamond drilling by Lake Shore Gold Mines intersected 5.52 gt Au over 5.4 m (including 21.96 g/t Au over 1.25 m), 10.46 g/t Au over 9 m (including 85.70 g/t Au over 1 m) and 4.97 g/t Au over 6 m (including 18.55 g/t Au over 1 m in TH10-06). The bulk of significant gold mineralization at the property is contained within two main deposits referred to as the Gold River East Deposit and the Gold River West Deposit, which are located on a three (3.3) km strike length of the Gold River Trend, which straddles the Tatachikapika River. Gold mineralization within the deposits generally occurs as stacked sets of steeply dipping irregular lenses which can vary from less than one metre up to about five (5) metres in width, from one hundred (100) to over four hundred (400) metres in vertical height and from (fifty (50) to six hundred (600) metres in strike length. Most mineralization identified to date occurs between surface and five hundred (500) metres below but has been traced with a few broadly spaced holes to as deep as 1,050 metres below surface, with several of the zones remaining open. Gold mineralization within the zones is associated with areas of broad disseminated and quartz vein- related arsenopyrite and pyrite mineralization, which varies from less than one percent to greater than twenty (20) percent, locally. Traces of pyrrhotite, tetrahedrite, stibnite, sphalerite, berthierite, boulangerite, zinkenite as well as native gold and native antimony have also been reported. Lake Shore Gold has included the following zones identified by Band-Ore and West Timmins Mining in the East Zone (South Limb, Plum, Nost, Main, Small, Diabase, West, South Limb-East, 4500E, 4800E and North Porphyry).

Mineral Record Details

Mineral Zones - Size and Shape

References

Map - Geological series, Precambrian geology of Thorneloe Township, Cochrane District

Publication Number: P2502 Scale: 1:15,840    Date: 1982

Author: Choudhry A.G.

Publisher Name: Ontario Geological Survey

Location:

MonoMap - The geology of Keefer, Denton and Thorneloe townships, District of Cochrane

Publication Number: OFR5699 Date: 1989

Author: Choudhry A.G.

Publisher Name: Ontario Geological Survey

Location:

Book - Updated Geological Report On The Thorne Property, NI 43-101 Document, 34 p.

Publication Number: 43-101 Date: 2002

Author: G. Cavey

Publisher Name:

Location: Timmins RGP

Map - Geological Compilation of the Timmins Area, Abitibi Greenstone Belt

Publication Number: P3379 Scale: 1:100,000    Date: 1998

Author: Ayer J.A., Trowell N.F.

Publisher Name:

Location:

Book - Summary Report On Thorne Property, NI 43-101 Report, 56p.

Publication Number: 43-101(2) Date: 2002

Author: G. Cavey

Publisher Name:

Location: Timmins RGP

Publication - Band-Ore Resources Ltd.

Publication Number: clippings Date: 1996

Author:

Publisher Name:

Location: Timmins RGP

Publication - Lake Shore Gold Corporation

Publication Number: clippings Date: 2011

Author:

Publisher Name:

Location: Timmins RGO

Book - Summary geological report on the Thorne Property, 35p.

Publication Number: 43-101 Date: 2004

Author: G. Cavey

Publisher Name:

Location: Timmins RGO

Publication - Preliminary Economic Assessment And Updated Mineral Resource Estimate For Timmins West Mine, Timmins, Ontario, Canada, 493p.

Publication Number: NI-43-101 Date: 2012

Author: D. Crick, R. Koch, R. Kusins, D. Powers, B. Buss

Publisher Name:

Location: Timmins RGO

Publication - Technical Report On The Update Of Mineral Resource Estimate For The Gold River Property, Thorneloe Township, Timmins, Ontario, 289p

Publication Number: NI 43-101 Date: 2012

Author: J. Samson, R. Kusins, D. Powers

Publisher Name:

Location: Timmins RGO

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For detailed information regarding this mineral record please contact the Timmins Resident Geologist District Office