Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI000000001443

Record: MDI000000001443

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Kerrs

Latitude: 48° 45' 36.67"    Longitude: -80° 8' 41.33"

UTM Zone: 17    Easting: 562850   Northing: 5401150    UTM Datum: NAD83

Resident Geologist District: Kirkland Lake

NTS Grid: 42A16SE

Point Location Description: Figure 29 of report http://www.shelteredoak.com/cms/wp-content/uploads/2011/11/OAK_Sept_2011_Present

Location Method: Other Literature

Exploration History

1960s gold bearing boulders were discovered on the Munro Esker to the southeast of the property. 1964-1965: Kennco Exploration completed gold grain counts in esker sands and soil sampling for mercury. 6 Diamond drill holes tested anomalies. 1977: Noranda Exploration Co. Ltd. Completed airborne magnetic and EM surveys. 1979-1983: Noranda completed RC drilling (114 holes totaling 4723 m), diamond drilling, (17 holes totaling 3988 m) ground magnetic and EM surveys and IP. 1982: Down-hole geophysics was completed. 1983: Diamond drill holes intersections included 5.4 g/t Au over 1.1 m and 9.7 g/t Au over 0.2 m. 1986-1987: 15 diamond drill holes totaling 8129 m. 1988: 4 additional diamond drill holes. 2004: SAGE completed MMI survey, ground magnetic survey and Landsat structural study. 2005: SAGE completed a 16 hole 7206 m diamond drilling program. 2006: MMI was completed on Kidston & Dyment option. 2008: 5 diamond drill holes totaling 2167 m. 2009: 8 diamond drill holes totaling 1747 m 2010: 15 diamond drill holes totaling 5944 m.

Assessment Work on File

Geology

Province: Superior

Subprovince: Abitibi

Terrane: Wawa-Abitibi

Belt: Abitibi

Tectonic Assemblage: Stoughton-Roquemaure

Geological Age: Archean  

Geology Comments

Jul 27, 2012 (D Guidon) - (Hubacheck 2008) The Kerrs Property is situated within the Abitibi Subprovince of the Superior Province of the Canadian Shield. The Abitibi Subprovince is more popularly known as the Abitibi Greenstone Belt, a geological province consisting of metavolcanic, metasedimentary and intrusive rocks of Archean age. It is the largest Archean-aged greenstone belt in the world and, in terms of gold and base metals production, the most prolific. The dominant rock type in the Abitibi Belt, as in greenstone belts worldwide, is sub-aqueous, ocean-floor basalt of tholeiitic affinities. However, metavolcanic rocks range in composition from ultramafic to felsic and are interlayered with clastic and chemical sedimentary rocks. Intermediate to felsic plutonic rocks were emplaced into these older units at various times throughout the Archean. Mafic to ultramafic basal crustal sill complexes are exposed locally. All of the aforementioned rocks are of mid to late Archean age, and were subsequently intruded by Proterozoic-aged diabase dykes. The deposit is hosted in volcanic rocks of the Stoughton-Roquemaure assemblage between the North Branch of the Porcupine-Destor Deformation Zone to the south and the Lake Abitibi Deformation Zone to the north.

Lithology

Lithology Comments

Jul 27, 2012 (D Guidon) - (Kirkham 2011) The volcanic stratigraphy to interpreted to have a north-westerly strike in the South Grid area, changing to a north-easterly strike in the North (Jam Lake) Grid area, as indicated by magnetic patterns. The Kerrs Property is underlain by a series of ocean floor tholeiitic basalts, ultramafic flows and sills, and felsic volcanics. These have been intruded by felsic porphyries of hypabyssal environments, as indicated by their fabric, and by later diabase dikes. The mafic volcanics have been described in drill logs as massive to pillowed, with typical, widespread greenschist facies mineralogy with pillow selvages of chlorite-epidote-carbonate. The ultramafic rocks tend to be massive, with local spinifex texture. The latter indicates that at least some of the ultramafic rocks are volcanic in origin; massive varieties may be intrusive due to high siliceous and magnetic susceptibility. Felsic volcanic rocks have been intersected in a number of drill holes, where flow banding has been described indicating proximal volcanic flows. In addition, felsic tuffs and breccias have also been noted in drill holes. Local flow breccias, agglomerates, and magnetite iron formations and interflow turbidite sediments form minor components of this series. The volcanic stratigraphy suggests a bimodal affinity, with at least some explosive volcanic activity recorded in the stratigraphy. Lithologies identified in drill holes suggest that this stratigraphy has been tightly, to isoclinally, folded about north-trending, sub vertical axes. Subsequently, this entire tightly-folded sequence was folded about an east-west to ESE-WNW anticlinal axis. This anticlinal axis is interpreted to strike through the Property on Az 110 degrees. A D2 fold deformation event is superimposed on the D1 open fold which has resulted in a second order syncline with the fold axis having a north-easterly strike of Az 040 degrees . Numerous feldspar (syenitic), to quartz-feldspar, hypabyssal intrusive rocks have intruded the volcanic rocks, and are semi-concordant with the general stratigraphy. This relationship suggests that these were probably emplaced before the two folding events. A silicification event is recorded in many drill holes and is present in all of the above lithologies, suggesting a syn to post-quartz-feldspar porphyry timing for the alteration. The silicification event appears to be contemporaneous with gold mineralization. It is characterized by a widespread alteration of the mafic/ultramafic rocks and porphyries, and by structurally-controlled quartz veining and quartz-carbonate stringer zones accompanied locally by green carbonate, fine pyrite and gold. The late silicification event may have resulted from nearby late granitic plutonism. Evidence of this is the granitic body of unknown dimensions found in drill holes about 2 km to the west of the Kerrs Property.

Mineralization

Mineralization Comments

Jul 27, 2012 (D Guidon) - (Kirkham 2011) Gold mineralization is hosted within green carbonate/quartz/fuchsite/ alteration interpreted to represent a fluid - generated hydraulic fracturing event of incompetent ultramafic flows, stratigraphically capped by competent thick Fe-rich andesitic flows. Concomitant with the hydrothermal fluids are albitite dykes, also sourcing from the parent magma chamber (QFP dykes and sills-AEM mag low).

Alteration Comments

Jul 27, 2012 (D Guidon) - (Kirkham 2011) An intensely altered zone consists of silicified, sericitized, mafic volcanics with replacement / shear veins enveloped by ghost breccias. The alteration system is characterized by pervasive silicification, seritization and dolomitization with intense shear veining abruptly bounding the top of the deformation zone. The base of the deformation zone is dominated by a major replacement type veining; ghost breccia clasts are angular with some partially ghost fuchsite clasts observed under microscope. A sericitized envelope bounds the upper portion of the shear vein system. A silicified, pyritized brecciated fracture zone bounds the shear vein system on the upper contact and the basal contact; fine to coarse py (1- 5%) is disseminated in smoky, grey silica flooding zones and aligned along margins of breccia clasts. Generally, the major shear vein system is sulphide poor with tr to .1%. A 2 cm wide graphite zone is seen in the major shear vein with dark, grey smoky amorphous quartz.

Mineral Record Details

References

Book - Kerrs Gold Deposit, NI 43-101 Resource Estimation on the Kerrs Gold Deposit, Matheson, Ontario

Publication Number: Date: 2011

Author: Kirkham, G.D.

Publisher Name:

Location: SEDAR

File - Resident Geologist file KL-2790

Publication Number: Date:

Author:

Publisher Name:

Location: Kirkland Lake RGP office

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

Publication Number: P3398 Scale: 1:100,000    Date: 1999

Author: Ayer J.A., Berger B.R., Trowell N.F.

Publisher Name: Ontario Geological Survey

Location:

Book - NI 43-101 Technical Report on the 2005 / 2006 / 2008 Surface Diamond Drilling Programs Prepared for the Kerrs Gold Property

Publication Number: Date: 2008

Author: Hubacheck, P.C.

Publisher Name:

Location: SEDAR

Mono - Overview of Results from the Greenstone Architecture Project: Discover Abitibi Initiative

Publication Number: OFR6154 Date: 2005

Author: Ayer J.A., Thurston P.C., Bateman R., Dubé B., Gibson H.L., Hamilton M.A., Hathway B., Hocker S.M., Houlé M.G., Hudak G., Ispolatov V.O., Lafrance B., Lesher C.M., MacDonald P.J., Péloquin A.S., Piercey S.J., Reed L.E., Thompson P.H.

Publisher Name: Ontario Geological Survey

Location:

Report an Error

We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.

Terms of Use

Please review our Terms of Use agreement for this data product.

Ministry Contact Information

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