Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42C02NW00032

Record: MDI42C02NW00032

General

Mineral Record Identification
Record Name(s)	Lal-126 Occurrence - 1996
Related Record Type	Simple
Related Record(s)
Record Status	Occurrence
Date Created	2000-Nov-24
Date Last Modified	2022-Sep-16
Created By
Revised By

Commodities

Primary Commodities: Diamond

Location

Township or Area: Lalibert

Latitude: 48° 14' 50.7" Longitude: -84° 52' 57.06"

UTM Zone: 16 Easting: 657194.06 Northing: 5345967.79 UTM Datum: NAD83

Resident Geologist District: Sault Ste. Marie

NTS Grid: 42C02NW

Point Location Description: Outcrop on east side of highway south of Evans Creek

Location Method: Field Visit with GPS

Access Description: Drive north along Highway 17 from the junction of highway 101 for a distance of approximately 36 km. The occurrence outcrops on the east side of the highway at the north end of a low outcrop.

Exploration History

1993-95: Sandor Surmacz - sampling, prospecting. 1996-97: Spider Resources Inc. - sampling, mapping.

Geology

Province: Superior

Subprovince: Wawa

Terrane: Wawa-Abitibi

Belt: Michipicoten

Geological Age: Neoarchean Geochronological Age: 2703 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 pillowed flow	2		Pillowed	Near

Lithology Comments

Dec 07, 2005 (A Wilson) - The lamprophyre dike hosts some well-rounded, oblate, actinolite-rich xenoliths (200 mm x 40 mm in size). A few subangular supracrustal xenoliths (50 mm) are also observed. The matrix of the lamprophyre is fine-grained. The dike intrudes a sequence of pillowed metavolcanics.

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 27.3 kg sample collected by Spider Resources in 1997 contained 1 macrodiamond (weight 128150 octocarats). Subsequent samples of 181.0 kg did not contain any diamonds. Geochemical analysis by Surmacz in 1993 returned 420 ppm Cr, 331 ppm Ni, 76 ppm Rb, 929 ppm Sr, 29.8 ppm La, 56 ppm Ce, 1074 ppm Ba and 1.86 wt% K2O.

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
Unknown		.75		308	73			2703	OFR 6016

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.