Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42D14SE00077

Record: MDI42D14SE00077

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Priske

Latitude: 48° 49' 42.87"    Longitude: -87° 13' 43.97"

UTM Zone: 16    Easting: 483201.67   Northing: 5408424.79    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 42D14SE

Point Location Description: Stripped area, trenches.

Location Method: Other Literature

Access Description: The Acker Otto property consists of the Power Creek, W3 Vein, W3 Extension and the Cabin Carbonate Zone occurrences. The Acker Otto property is located approximately 3.2 km northeast of Schreiber. The Cabin Carbonate Zone encompasses a large stripped area 200 m by 300 m in size which is located approximately 500 m east southeast of the McKenna McCann shaft. The Power Creek Occurrence is located 50 m north of the Cabin Carbonate Zone, along Power Creek. The W3 Occurrence is located 140 m east southeast of the McKenna McCann property and the W3 Extension is located some 20 m further to the southeast. Access may be gained via the old Cook Lake road north and east from Schreiber to the McKenna McCann property. The occurrence lies approximately 300 m east along a trail extending from near the old McKenna McCann shaft.

Exploration History

1930s: May have been prospected during exploration of neighbouring McKenna-McCann prospect. 1988: W. Acker and R. Otto staked the area around the McKenna-McCann prospect. 1989: W. Acker and R. Otto conducted mechanical tripping, trenching and sampling to the south east of the McKenna-McCann property. Extensive carbonate alteration was discovered and named the Cabin Carbonate Zone. The Power Creek iron formation was discovered in October. 1990: W. Acker and R. Otto conducted mechanical stripping and trenching on the McKenna-McCann property. During the fall of 1990, the W3 vein system, which represents an extension of the McKenna McCann system was discovered. The Cabin Carbonate Zone was channel sampled by consulting geologist T. Pryslak. 1991: Mechanical stripping, trenching and sampling was conducted by W. Acker and R. Otto on the W3 veins. In addition, the W3 Extension veins were discovered. The McKenna-McCann shaft was refurbished and dewatered in the fall of 1991 and several samples were collected from underground. 1992: W. Acker and R. Otto died of carbon monoxide poisoning while dewatering the McKenna-McCann shaft. 1997: M. Jean and J. Otto contracted Clark-Everleigh Consulting to carry out geological mapping and sampling. 1998: M. Jean contracted Ovalbay Geological Services Ltd. to carry out trenching and sampling. 2003: S. Kravchik carried out prospecting, sampling, and till and soil sampling.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wawa

Terrane: Wawa-Abitibi

Belt: Schreiber-Hemlo

Geological Age: Archean  

Geology Comments

Dec 07, 2005 (B Nelson) - The general geology consists of predominantly mafic, spherulitic pillowed metavolcanic flow rocks, and minor iron formation which have been intruded by metagabbro and metadiorite dikes, lamprophyre dikes and small quartz feldspar porphyry stocks or dikes. Pillow cusps indicate tops to the northeast. Air photo interpretation and field evidence suggest several major northwest trending lineaments, including a Big Duck Creek Hays Lake lineament, Hollinger Lake lineament and a Craft Lake Lamont Lake lineament. A secondary or minor fault set trending southwest-northeast, and occasionally N-S is present within this area. This conjugate fault set appears common in areas of gold mineralization. The northwest trending shear zones are sub parallel to the long axis of the stretched pillows. An approximate 5 by 3 km rectangular parcel of land in this area, bounded by the Croft Lake lineaments discussed is highly recommended for prospecting and exploration (Patterson et al. 1987). The Cabin Carbonate Zone lies immediately south of the Power Creek iron formation. The zone is characterized by pillowed mafic metavolcanics and autoclastic breccias that have been pervasively carbonatized. A rusty carbonate weathered surface has developed on virtually all outcrops. The Power Creek Occurrence lies approximately 500 m east-southeast of the shaft and trenched area of the McKenna-McCann property. The host rocks consist maily of carbonatized, locally pillowed mafic flows which are foliated at 230/40N. Chert, sedimentary chert breccia and iron formation area intercalated with the metavolcanic rocks. A conjugate set of faults striking at 25 and 135 degrees has influenced the dev't of minor structures, auriferous quartz veins and local topography. The W3 vein consists of massive bull-white quartz , locally having a crack-seal texture. The host is a medium grained, orange to rusty weathering gabbroic-textured mafic metavolcanic. The W3 vein extends over a 100 m strike length.

Lithology

Lithology Comments

Dec 07, 2005 (B Nelson) - Cabin Carbonate Zone: Although pillows are flattened, tops suggest that local flows young to the south. Fine grained, dark green selvages may be recessively weathered. Pillows may have (synvolcanic?) alteration envelopes and commonly quartz+carbonate filled amygdules and pipe vesicles. Rusty, chlorite rich hyaloclastite and sulphidic chert breccia occur between pillows. Coarser grained gabbro or gabbroic flows occur within, and likely intrude, the mafic flow sequence, but contact relationships are unclear. The mafic metavolcanics are locally brecciated and extensively mineralized with euhedral pyrite and chalcopyrite. Several narrow, discrete shear zones are exposed throughout the stripped area. Power Creek Occurrence: A banded jasper magnetite iron formation is exposed in the bed of a small creek, locally called Power Creek, which flows into Big Duck Creek. This is perhaps the first discovery of well developed banded jaspilitic iron formation in the Schreiber Hemlo District. Minor jasper has been identified near the Schreiber Pyramid mine site. Locally, jasper is notably absent in virtually all oxide and sulphide facies iron formations. The unit is thinly bedded; some beds are contorted and/or brecciated.

Mineralization

Mineralization Comments

Dec 07, 2005 (B Nelson) - Power Creek Occurrence: Sparry calcite, epidote and drusy tourmaline occur as accessory minerals in the massive to ribbon textured quartz veins. Fine to coarse grained euhedral pyrite occurs in the iron formation proximal and adjacent to the veins. There is some preferential replacement of the magnetite by pyrite. Other sulphides have not yet been recognised. W3 Vein: The vein is sporadically mineralized with anhedral aggregates and euhedral of pyrite + chalcopyrite <5%. The 'crack seal' textured portions of the vein contain significantly more chalcopyrite and rare, fine grained visible gold, and unsurprisingly returned higher gold assays. More than 29 grab and chip samples were collected (by Resident Geologist personnel) from the Cabin Carbonate Zone during 1989 and 1990. In general the numbers were 'discouraging' with the highest assays indicating up to 0.012 ounce Au per ton, 0.10 ounce Ag per ton and 640 ppm Cu. Anomalous gold values were encountered, however, no economic values were encountered. The best result from the Power Creek Occurrence was 0.066 oz/ton Au from jasper-magnetite banded iron formation with veinlet and euhedral disseminated (<2%) py. The best result from the W3 vein was 0.011 oz/ton Au from 'crack seal' vein with py and <2% cp. The best result from the W3 Extension was 0.325 oz/ton Au from 'fairly massive, bull white quartz vein with subhedral and disseminated pyrite. Selected grab samples of the 'crack seal' portions of the vein have returned up to 3.91 oz/ton Au (W. Acker, prospector, personal communication, 1991).

Alteration Comments

Dec 07, 2005 (B Nelson) - Cabin Carbonate Zone: The zone is characterised by pillowed mafic metavolcanics and autoclastic breccias that have been pervasively carbonatized. A rusty carbonate weathered surface has developed on virtually all outcrops. Although pillows are flattened, tops suggest that local flows young to the south. Fine grained, dark green selvages may be recessively weathered. Pillows may have (synvolcanic?) alteration envelopes and commonly quartz+carbonate filled amygdules and pipe vesicles. Rusty, chlorite rich hyaloclastite and sulphidic chert breccia occur between pillows. Quartz-carbonate alteration with minor tourmaline occurs along fractures and joints in association with sulphides and mineralized, fine-grained quartz veinlets. W3 Vein: The host is a medium-grained, orange to rusty-weathering gabbroic-textured mafic metavolcanic. It has locally been silicified and carbonatized where exposed proximal to the vein. Nearby, similarly altered mafic metavolcanics, gabbro and jaspalitic iron formation have been noted.

Mineral Record Details

Site Visit Information

Date: Feb 20, 1997

Geologist: B Nelson

Notes: Resident Geologist personnel visited the occurrence in October of 1989; July 11, 1990; October 24, 1990; November 7, 1990; May 22, 1991; August 27, 1991; July 14, 1992; August 6, 1992; June of 1993; August of 1993.

References

Map - Nipigon-Schreiber, geological compilation series, Thunder Bay District

Publication Number: M2232 Scale: 1:253,440    Date: 1973

Author: Carter M.W., McIlwaine W.H., Wisbey P.A.

Publisher Name: Ontario Division of Mines

Location:

Mono - Geology of Schreiber-Terrace Bay area, District of Thunder Bay

Publication Number: OFR5692 Date: 1988

Author: Carter M.W.

Publisher Name: Ontario Geological Survey

Location:

Part - The southwestern part of the Schreiber area

Publication Number: ARV47-09.001 Page: 23-25  Date: 1998

Author: Harcourt G.A.

Publisher Name: Ontario Dept. of Mines

Location:

Article - Thunder Bay Resident Geologist's area, North Central Region

Publication Number: MP134.004 Date: 1997

Author: Patterson G.C., Scott J.F., Mason J.K., Schnieders B.R., MacTavish A.D., Dutka R.J., Kennedy M.C., White G.D., Hinz P.

Publisher Name: Ontario Geological Survey

Location:

File - Schreiber-Hemlo Resident Geologist Mineral Deposit Files, Thunder Bay office

Publication Number: Min Dep Date:

Author:

Publisher Name:

Location: Thunder Bay RGP

Map - Schreiber-Duck Lake area, District of Thunder Bay

Publication Number: ARM30A Scale: 1:63,360    Date: 1998

Author: Hopkins P.E., Tanton T.L.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Schreiber area, District of Thunder Bay, Ontario

Publication Number: ARM47J Scale: 1:31,680    Date: 1997

Author: Bartley M.W., Harcourt G.A.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Mineral Occurrences in the Nipigon-Marathon Area, Volumes 1 and 2.

Publication Number: OFR5951 Page: 372-385  Date: 1996

Author: Schnieders B.R., Smyk M.C., Speed A.A., McKay D.B.

Publisher Name: Ontario Geological Survey

Location:

Article - Schreiber-Hemlo Resident Geologist's District - 1990

Publication Number: MP152.007 Date: 1997

Author: Schnieders B.R., Smyk M.C., Hinz P.

Publisher Name: Ontario Geological Survey

Location:

Map - Geological series, Precambrian geology of the Terrace Bay area, west sheet, Thunder Bay District

Publication Number: P2417 Scale: 1:15,840    Date: 1981

Author: Carter M.W.

Publisher Name: Ontario Geological Survey

Location:

Article - Schreiber-Hemlo Resident Geologist's District-1991

Publication Number: MP158.007 Date: 1997

Author: Schnieders B.R., Smyk M.C., McKay D.B.

Publisher Name: Ontario Geological Survey

Location:

Compend - Report of Activities 1992, Resident Geologists

Publication Number: MP161 Page: 132-133  Date: 1993

Author: Fenwick K.G., Pitts A.E., Newsome J.W.

Publisher Name: Ontario Geological Survey

Location:

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For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office