Ontario Mineral Inventory

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Ontario Geological Survey
Permanent Link to this Record: MDI42C02NW00030

Record: MDI42C02NW00030

General

Mineral Record Identification
Record Name(s)	Lal- 3 Occurrence - 1996
Related Record Type	Simple
Related Record(s)
Record Status	Occurrence
Date Created	2000-Nov-23
Date Last Modified	2022-Sep-16
Created By
Revised By

Commodities

Primary Commodities: Diamond

Location

Township or Area: Lalibert

Latitude: 48° 12' 49.55" Longitude: -84° 50' 59.06"

UTM Zone: 16 Easting: 659732 Northing: 5342295 UTM Datum: NAD83

Resident Geologist District: Sault Ste. Marie

NTS Grid: 42C02NW

Point Location Description: Narrow dike at north end of highway roadcut

Location Method: Field Visit with GPS

Access Description: Drive north along Highway 17 from the junction of highway 101 for a distance of approximately 32 km. The occurrence outcrops on the east side of the highway in a 4 m high outcrop. This dike is located approximately 150 m north of the main Sandor occurrence.

Exploration History

1993-95: S. Surmacz and M. Hauseux - prospecting, sampling. 1996-2000: Spider Resources Inc. - sampling, mapping.

Geology

Province: Superior

Subprovince: Wawa

Terrane: Wawa-Abitibi

Belt: Michipicoten

Geological Age: Neoarchean Geochronological Age: 2703 MA Geochron. Age Ref.: OFR 6016

Geology Comments

Dec 07, 2005 (A Wilson) - The diamond occurrences appear to be restricted to a D1 recumbent nappe in the west-central portion of the Michipicoten greenstone belt. The nappe is imbricated by south-vergin reverse faults. The direction of nappe transport is from south to north and it lies immediately north and adjacent to the Kapuskasing Structural Zone. This thrusting and shortening may be related to the tectonic events along the Kapuskasing Structural Zone. The western limit of the nappe is likely the Dickenson Lake fault that passes to the west of the Dickenson Lake stock. The nappe is not likely to extend east beyond the Marsden Fault. While lamrophyre dikes favourable to hosting diamond and ones that cut the diamond-bearing lamprophyres are commone east of the Dickenson Lake stock, they are absent west of the the stock.

Lithology

Lithology Data
Rock Type	Rank	Composition	Texture	Relationship
Lamprophyre-Unsubdivided	1		Xenolith-Bearing	Host
Mafic lava flow-unsubdivided	2			Near

Lithology Comments

Dec 07, 2005 (A Wilson) - The lamprophyre is fine grained and dark green weathering. It closely resembles the dike at the Sandor Occurrence, but is host to fewer mantle xenoliths.

Mineralization

Mineralization and Alteration
Rank	Mineral Name	Class	Economic Mineral Type	Alteration Mineral Type	Alteration Ranking	Alteration Intensity	Alteration Style
1	Diamond	Economic	Ore

Mineralization Comments

Dec 07, 2005 (A Wilson) - A 34.6 kg sample collected by Spider Resources in 1996 returned 1 microdiamond.

Mineral Record Details

Mineral Zones - Size and Shape

Rank: 1 Structure Type: None

Zone Name: Detour Lake - Rank 1
Shape	Length	Thickness	Depth	Strike	Dip	Plunge	Trend	Age	Reference
Irregular		2

Site Visit Information

Date: Nov 23, 2000

Geologist: A Wilson

Notes: The dike is narrow, steeply dipping and appears to trend parallel to the regional schistocity. This dike cannot be traced beyond the outcrop.

References

File - Resident Geologist files WP Rabazo-32, WP_Lalibert-02

Publication Number: Date:

Author:

Publisher Name:

Location: SSM RGP office

Map - Precambrian Geology, Lalibert Township

Publication Number: OFM0221 Scale: 1:15,840 Date: 1993

Author: Sage R.P.