Ontario Geological Survey
Permanent Link to this Record:
MDI42C13SW00038
| Record Name(s) | East Barbara Lake Au - 1990, Gossans 41 and 42 - 1985, Highway 614 Sillimanite Occurrence - 1990 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1996-Dec-03 |
| Date Last Modified | 2023-Aug-03 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Secondary Commodities: Sillimanite
Township or Area: Wabikoba Lake Area
Latitude: 48° 47' 7.06" Longitude: -85° 51' 5.26"
UTM Zone: 16 Easting: 584366.78 Northing: 5404224.52 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42C13SW
Point Location Description: HWy 614 road-cut
Location Method: Field Visit
Access Description: The East Barbara Lake gold occurrence is located in a road cut on the east side of Highway 614 approximately 37.5 km south of Manitouwadge and 400 m east of Barbarara Lake. The occurrence is accessible via motor vehicle. From Manitouwadge, proceed south along Highway 614 for approximately 44 km to an unnamed gravel road which accesses a microwave tower located east of the highway. The road cut exposing the occurrence is located approximately 50 m north of the intersection between this gravel road and Highway 614. Gold-bearing metasedimentary rocks are reported to occur near the northern end of the road cut.
1957: Geological mapping; CPR (M. Bartley, T. Page). 1964-1965: Geological mapping; ODM (V.G. Milne). 1978-1979: Lake sediment and water geochemical sampling; GSC and MNR. Samples collected from the vicinity of the occurrence contained slightly anomalous amounts of Cu, Zn and Au. 1983: Line cutting and ground geophysical surveys (MAG, VLF-EM); Western Pacific Energy Corporation and Vanstates Resources Limited. Airborne geophysical survey (HLEM, VLF-EM, MAG); Aerodat Ltd. 1985: Geological mapping; OGS (G.M. Siragusa and K.M. Chivers). Siragusa and Chivers noted the presence of gossanous rock in the vicinity of the occurrence. 1989: Dighem airborne geophysical survey; Noranda Exploration Co., Ltd. and Noranda Minerals Inc. (Geco Division). 1990: Lithogeochemical sampling; OGS (M. Smyk). 1991: Reconnaissance till sampling; GSC (I.M. Kettles). Lithogeochemical sampling; OGS (D. B. McKay). 1995-6: R. Wahl carried out prospecting and sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.5688 | 42C13SW0071 | 42C13SW0071 |
| 2.17221 | 42C13SW0174 | 42C13SW0174 |
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Belt: Schreiber-Hemlo
Geological Age: Archean
Metamorphism Type: Regional
Metamorphism Grade: Amphibolite
Dec 07, 2005 (D McKay) - The East Barbara Lake gold occurrence is located in the Wawa Subprovince approximately 11.5 km north-northeast of the Hemlo gold mines. The area surrounding the occurrence is underlain primarily by an easterly-trending sequence of clastic metasedimentary rocks which comprise a portion of the the north limb of the Schreiber-Hemlo greenstone belt (Milne 1968, Map 2147; Siragusa and Chivers 1986, Map P.3046). The rocks in this area are locally strongly foliated (090 to 100 /80 N) and mineral assemblages indicate they have experienced lower amphibolite facies-grade regional metamorphism (Milne 1968). In the vicinity of the occurrence, the metasedimentary sequence is approximately 2.2 km wide and is bounded to the north and south by granodioritic rocks of the Musher Lake and Bullring Lake plutons, respectively (Milne 1968b, Map 2147). The occurrence is located approximately 475 m north of the contact with the Bullring Lake Pluton (Milne 1968b, Map 2147). A small body of amphibolitic rock, interpreted by Milne (1968b, Map 2147) to be a metamorphosed gabbro, is located approximately 125 m north of the occurrence.
| Rock Type | Rank | Composition | Texture | Relationship | Paragneiss | 1 | Bio-Q-Fel Paragneiss | Host |
|---|
Dec 07, 2005 (D McKay) - The sillimanite gneiss is dark-grey in colour, medium- to fine-grained, and has a crenulated foliation. The rock appears to be slightly richer in biotite than the typical paragneiss and contains appreciably more garnet. paragneiss.The small euhedral red garnets vary in size up to about 3 mm. The sillimanite grains vary in size up to 1/4 inch long by 1/8 inch wide and often have a bluish bladed appearance, but the bladed grains commonly have frayed fibrous terminations. The sillimanite is also found as groups of colourless needles, which may weather white on the surface.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| Sillimanite | Alteration | Unknown | 1 | Unknown | Disseminated | ||
| Garnet | Alteration | Unknown | 2 | Unknown | Disseminated |
Dec 07, 2005 (D McKay) - A grab sample of dark gray, moderately foliated, garnetiferous, weakly pyritic, sillimanite schist collected from the occurrence by M. Smyk for the Ontario Geological Survey in 1990 returned an assay value of 0.072 ounce Au per ton (Resident Geologist's files, Schreiber-Hemlo District, Thunder Bay). The pulp from this sample was reassayed and returned values of 0.078 and 0.090 ounce Au per ton (Resident Geologist's files, Schreiber-Hemlo District, Thunder Bay). Other grab samples collected subsequently from the occurrence returned assay values of up to 19 ppb Au (Resident Geologist's files, Schreiber-Hemlo District, Thunder Bay). Grab samples of gossanous, mafic-poor, clastic metasedimentary rock collected from the vicinity of the occurrence by G. Siragusa and K. Chivers in 1985 for the Ontario Geological Survey returned assay values of up to 18 ppb Au (Siragusa and Chivers 1986, Map P.3046, Gossans 40, 41, and 42). A grab sample of rusty-weathering, gray-green, moderately foliated, medium-grained, garnetiferous, weakly pyritic, sillimanite schist collected from the occurrence by D.B. McKay for the OGS in 1991, returned an assay value of nil Au (Resident Geologist's files, Schreiber-Hemlo District, Thunder Bay). To date, only one grab sample collected from the occurrence has returned significant gold values (see above). Further work is required to assess the significance of these results and to determine the potential of the surrounding area to host additional gold.
Mar 13, 2019 (Therese Pettigrew) - Sample 62 collected by R. Wahl from the west shore of Barbara Lake in 1996 returned an assay of 0.72 g/t Au (Assessment file 42C13SW0174).
Dec 07, 2005 (D McKay) - The presence of sillimanite, garnet and orthoamphiboles, minerals commonly ascribed to hydrothermal alteration near base metal deposits, in the metasedimentary rocks in the vicinity of the occurrence suggest the area should be investigated for its base metal potential as well.
| Rank | Classification |
|---|---|
| 1 | Unknown |
| Rank | Characteristic |
|---|---|
| 1 | Disseminated |
File - Schreiber-Hemlo Resident Geologist Mineral Deposit Files
Publication Number: Min Dep Date:
Author:
Publisher Name:
Location: Thunder Bay RGP
Map - Geophysical Series, White Lake, Thunder Bay District, Ontario
Publication Number: Map 2168G Scale: 1:63,360 Date: 1963
Author: Geological Survey of Canada
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/116493
MonoMap - Geology of the Black River area, District of Thunder Bay
Publication Number: R072 Date: 1968
Author: Milne V.G.
Publisher Name: Ontario Dept. of Mines
Location:
Map - White Lake sheet, Thunder Bay District
Publication Number: M2147 Scale: 1:31,680 Date: 1968
Author: Milne V.G.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Mineral Occurrences in the Manitouwadge Area, Volumes 1, 2 and 3
Publication Number: OFR5906 Page: 123-129 Date: 1994
Author: McKay D.B.
Publisher Name: Ontario Geological Survey
Location:
Article - Schreiber-Hemlo Resident Geologist's District - 1990
Publication Number: MP152.007 Page: 161 Date: 1997
Author: Schnieders B.R., Smyk M.C., Hinz P.
Publisher Name: Ontario Geological Survey
Location:
Map - Manitouwadge-Wawa sheet, geological compilation series, Algoma, Cochrane, Sudbury and Thunder Bay districts
Publication Number: M2220 Scale: 1:253,440 Date: 1972
Author: Milne V.G., Giblin P.E., Bennett G., Thurston P.C., Wolfe W.J., Giguere J.F., Leahy E.J., Rupert R.J.
Publisher Name: Ontario Division of Mines
Location:
Map - Geological series, Precambrian geology, White Lake (Hemlo) area, Dotted Lake and Black River sections, District of Thunder Bay
Publication Number: P3046 Scale: 1:15,840 Date: 1986
Author: Siragusa G.M., Chivers K.M.
Publisher Name: Ontario Geological Survey
Location:
We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.
Please review our Terms of Use agreement for this data product.
For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office