Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52C09NE00007

Record: MDI52C09NE00007

General

Mineral Record Identification
Record Name(s)	Mills Creek - 1990
Related Record Type
Related Record(s)
Record Status	Occurrence
Date Created	1990-Dec-08
Date Last Modified	2022-Feb-24
Created By
Revised By

Commodities

Primary Commodities: Gold

Secondary Commodities: Copper, Silver

Location

Township or Area: Factor Lake Area

Latitude: 48° 44' 38.68" Longitude: -92° 11' 18.36"

UTM Zone: 15 Easting: 559663.34 Northing: 5399324.44 UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 52C09NE

Point Location Description: Showing on OGS map P2405

Location Method: Data Compilation

Access Description: Highway 11, 32 kilometres west of Atikokan, the accessible by private road of W. Murray.

Exploration History

Minor trenching, stripping and pits up to 4.5 m in depth. Ownership unknown. 1980: W.S. Murray staked the property. 1985: D. Kroomco and W. Murray conducted stripping, trenching and sampling. No assessment reports found on file.

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Calm-Lac des Mille Lacs

Geological Age: Archean

Lithology

Lithology Data
Rock Type	Rank	Composition	Texture	Relationship
Mafic lava flow-unsubdivided	1			Host
Vein	2	Quartz And Carbonate Veinlets		Host

Mineralization

Mineralization and Alteration
Rank	Mineral Name	Class	Economic Mineral Type	Alteration Mineral Type	Alteration Ranking	Alteration Intensity	Alteration Style
1	Arsenopyrite	Economic	Ore
2	Chalcopyrite	Economic	Ore
3	Galena	Economic	Ore
4	Pyrite	Economic	Ore
5	Sphalerite	Economic	Ore
	Carbonate	Alteration		Carbonatization	1	Medium	Veins

Mineralization Comments

Sep 14, 2020 (Therese Pettigrew) - The occurrence consists of an extensive brecciated volcanic carbonate unit, randomly intruded by cross-cutting quartz and carbonate veinlets. It is located on the northern portion of the Quetico Fault zone. Both the volcanic carbonate unit and the veinlets contain disseminated pyrite, chalcopyrite and arsenopyrite. The sulphides are more concentrated in the veinlets. This unit is iron-rich and exhibits reddish weathering (Fenwick et al., 1980). Scnieders et al (1981) further described the vein systems: “Vein 1 is a quartz stockwork in an intermediate to mafic metavolcanic. Individual quartz stringers range in width from 0.6 centimetre to 5 cm. Field observation indicated carbonate and epidote alteration as well as minor pyrite and chalcopyrite mineralization. Vein 21 also termed the Galena Vein, is north of Vein 1 in the northwest corner of claim TB475486. The showing is narrow quartz stringers and discontinuous quartz veins in mafic metavolcanics with carbonate alteration evident on the quartz margins. The quartz is primarily of a milky and sugary variety, striking approximately 266 degrees and dipping vertically. Minor galena and sphalerite were noted within the vein. Vein 3 on the northern boundary of claim TB475486 and near the powerline is exposed due to trenching revealing four showings of narrow quartz stockwork to mafic metavolcanics. Individual quartz stringers are from a few millimetres to 4 cm in width with indication of carbonate alteration and minor pyrite and chalcopyrite mineralization. Vein 4 near the northern boundary of claim TB475487 is composed of quartz veinlets bounded by chloritized mafic metavolcanic. The quartz vein strikes 267 degrees and dips 75 degrees north with carbonate alteration and minor chalcopyrite mineralization. Vein 5 on claim TB475487 is in an intrusive and a mafic metavolcanic existing as scattered quartz stringers occurring throughout both units. The contact between the intrusive, apparently a diorite and the metavolcanic is covered by overburden. Quartz stringers of no definite strike are also scattered between the intrusive and a 10-centimetre wide lamprophyre dike, with very minor chalcopyrite mineralization. An old pit 4.5 metres in depth was noted in the vicinity of Vein 5. The walls of the pit indicate sericite alteration of the metavolcanic unit. The highway veins are on the northern part of claim TB475489 and near and north of Highway 11. Two large veins up to 1.5 metres wide and a hundred-metre long strike east-west and dip vertically. Highway Vein A has been trenched 25 cm wide, 15 cm deep and 3 m in length. Highway Vein B is exposed approximately 10 m northeast of the Highway Vein A and ranges between 1.2 and 1.5 m in width. The smoky to blue quartz of both these veins contains the most favourable chalcopyrite mineralization of all the veins seen on the property and is hosted by highly altered and chloritized mafic metavolcanic. Both anastomosing quartz veins (stockworks) and west striking vein systems are hosted by or adjacent to carbonate-rich units. Carbonate units may represent either synvolcanic units or intense carbonate alteration of metavolcanic rocks, of which the latter possibility is more acceptable. The carbonate units appear stratiform, however, the vein systems appear to be structurally controlled." Samples collected by OGS staff in 1979 returned values of up to 0.02 oz/t Au (0.68 g/t Au), 0.11 oz/t Ag (3.77 g/t Ag), 240 ppm Cu, 70 ppm co, 178 ppm Ni, 38 ppm Pb, and 163 ppm Zn (Fumerton, 1985).

Assay Samples

Assay Samples
Commodity	Analytical Method	Result	Unit
Gold	Unknown	.02	oz/t
Gold	Unknown	.03	oz/t
Silver	Unknown	.21	oz/t
Silver	Unknown	.11	oz/t

Mineral Record Details