Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42A11SE00007

Record: MDI42A11SE00007

General

Mineral Record Identification
Record Name(s)	Marlhill Mine - 1989, Johnston Option - 1936
Related Record Type	Simple
Related Record(s)
Record Status	Past Producing Mine With Reserves or Resources
Date Created	1987-Jul-14
Date Last Modified	2023-Apr-14
Created By
Revised By

Commodities

Primary Commodities: Gold

Location

Township or Area: Hoyle

Latitude: 48° 33' 36.26" Longitude: -81° 10' 17.3"

UTM Zone: 17 Easting: 487348 Northing: 5378567 UTM Datum: NAD83

Resident Geologist District: Timmins

NTS Grid: 42A11SE

Point Location Description: shaft

Location Method: AMIS Site Visit

Access Description: Access is via gravel road directly north of the Hoyle Pond Gatehouse. Access to the gatehouse is via a gravel road that extends northwards from Florence Street in Porcupine, Ontario and passes by the Broulan Reef shaft.

Exploration History

1935: Broulan Reef Mines Limited - property visit, sampling. 1936-37: Hollinger Consolidated Gold Mines Ltd. - stripping, sampling, DD-5. 1959: Broulan Reef Mines Limited - sampling, DD- 6-2014 feet, mapping. 1963: Broulan Reef Mines Limited - DD-1-537 ft. 1978-1982: Rosario Resources Ltd. - trenching, surface stripping, mapping, ground geophysics, RC drilling, DD-22. 1982-87: Canamax Resources Inc. - DD-45-7372 m, IP survey. 1989-1991: Canamax Resources Inc. - UG DD-117-6302 m, test mining, commercial production. 1995-1997: Pentland Firth Ventures Ltd. - DD-130-33,547 m, dewatering and UG DD-10-3566 m. 2002: Kinross Gold Corporation - DD-9-411m. 2003-2004: Porcupine Joint Venture - mining of crown pillar. 2010: Lake Shore Gold Corp. - DD-4-3116 m

Assessment Work on File

Assessment Work on File
Office File Number	Online Assessment File Identifier	Online Assessment File Directory
T-0447 / 10	42A11SE0100	42A11SE0100
T-1928 / 2.2937	42A11SE0084	42A11SE0084
T-2787 / OM84-5JV-342 / 63.4730	42A11SE0118	42A11SE0118
T-2787 / OM82-5-JV-151 / 63.4263	42A11SE0062	42A11SE0062
T-2787 / OM83-5JV-334 / 63.4458	42A11SE0064	42A11SE0064
63A.382	42A11SE0335	42A11SE0335

Geology

Province: Superior

Subprovince: Abitibi

Terrane: Wawa-Abitibi

Belt: Abitibi

Tectonic Assemblage: Tisdale

Geological Age: Neoarchean

Metamorphism Type: Regional

Metamorphism Grade: Greenschist

Lithology

Lithology Data
Rock Type	Rank	Composition	Texture	Relationship
Mafic lava flow-unsubdivided	1	Mg-Tholeiite	Massive, Pillowed, Variolitic, Amyg.	Host
Vein	2			Contains
Siltstone	3	Greywacke	Interbedded With Siltstone/Mudstone	Hanging Wall

Lithology Comments

Dec 07, 2005 (R Pressacco) - The mafic volcanic rocks consist of massive and pillowed flows. Diamond drilling on the property by Pentland Firth Ventures Ltd. has interesected variolitic textured mafic volcanic rocks. Amygdaloidal textures were observed in diamond drill core approximately 500 metres southeast of the portal, but the mafic flows in the immediate vicinity of the portal are more schistose, The clastic sediments are composed chiefly of interbedded greywacke and mudstone. Berger (1992) observed opposing facing directions in these sediments. In the central portions of Lot 8 concession II, Hoyle Township, a northeasterly younging direction very near the mafic volcanic contact was observed in core from one diamond drill hole, and a southwest facing direction was observed in a second diamond drill hole located approximately 200 metres to the northeast. This suggests that the mafic volcanic - sediment contact is situated on the northeastern limb of an anticlinal fold.

Mineralization

Mineralization and Alteration
Rank	Mineral Name	Class	Economic Mineral Type	Alteration Mineral Type	Alteration Ranking	Alteration Intensity	Alteration Style
1	Gold	Economic	Ore
2	Pyrite	Economic	Ore
4	Sphalerite	Economic	Ore
5	Pyrrhotite	Economic	Ore
1	Ankerite	Economic	Gangue
2	Arsenopyrite	Economic	Gangue
3	Tourmaline	Economic	Gangue
	Sericite	Alteration		Unknown	1	Medium	Replacement
	Carbonate	Alteration		Unknown	2	Medium	Replacement

Mineralization Comments

Nov 04, 2011 (A Wilson) - Hollinger Consolidated Gold Mines Ltd who conducted a stripping and sampling program on the Johnston Option. There they discovered several narrow quartz veins containing values up to $11.80 / ton (0.337 oz / ton Au @ $35 Au) in 1936. Work performed by Broulan Reef Mines Limited in 1957 discovered additional quartz veins, with the best assays returning values of 0.12 oz / ton Au over a 30 foot strike length from one trench, and 0.37 oz / ton Au over a 24.5 foot strike length from a second trench. .Assays from the diamond drilling program were 0.12 oz/t and 0.02 oz/t Au over an undetermined width. Mineralization consists of narrow (0.1 m) to wide (3.0 m) quartz veins with 2% to 5% pyrite, arsenopyrite and rarely visible gold. Gold occurs as plates on the surface of sulphide minerals but has an affinity for arsenopyrite. A sericite-sulphide halo extends up to 1 m from the vein.

Dec 07, 2005 (R Pressacco) - The tourmaline species is commonly dravite - a light to medium brown colour.

Alteration Comments

Dec 07, 2005 (R Pressacco) - Kent (1990) describes the mineralization and attendant alteration as follows: '... mineralization consists of a 0.1 to three metre wide central quartz vein, which contains two to five percent fine-grained pyrite, arsenopyrite, and rarely visible gold. Gold occurs as plates on the surfaces of sulphide minerals, but shows a preference for arsenopyrite. Significant amounts of brown tourmaline occur in all veins. Where white mica and sulphides commonly occur on slips and fractures within the vein, gold tenor generally attains economic values. A sericite-sulphide halo extends up to one metre from the vein. Only about 10 to 20% of the gold occurs associated with this wall rock sulphide. Coarse to medium grained cubic pyrite extends farther away from the vein margin, into the host mafic metavolcanic rocks.