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Ontario Geological Survey
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MDI42E04SE00004
| Record Name(s) | Gravel River Calcite Occurrence - 1958 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 1997-Jan-03 |
| Date Last Modified | 2022-Sep-12 |
| Created By | |
| Revised By |
Primary Commodities: Calcite
Township or Area: Gravel River Area
Latitude: 49° 1' .18" Longitude: -87° 41' 14.99"
UTM Zone: 16 Easting: 449731.774 Northing: 5429541.845 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42E04SE
Point Location Description: Occurrence
Location Method: Conversion from MDI
Access Description: The occurrence is located approximately 38 km northwest of Schreiber on the west bank of the Gravel River. The occurrence is only accessible by helicopter at this time. A road passing within 78 m of the occurrence is no longer usable, as the bridge crossing the Gravel River has collapsed. The veins can be accessed by snowmobile in the winter. The road is located 5 km east of where the Gravel River intersects Highway 17. The occurrence is located 15 km north of the highway, west of the road.
PAST: 1958 The occurrence was staked by C. Farley. No work was recorded. 1965 J.G. Simard staked the occurrence. No work was recorded. 1967 J.G. Simard re-staked the occurrence. No work was recorded. 1981 J.E. Nelson staked the occurrence. No work was recorded. CURRENT: 1994 The occurrence is currently unstaked.
Province: Superior
Subprovince: Quetico
Geological Age: Archean
Dec 07, 2005 (R Degagne) - The occurrence is located within the Quetico Subprovince and is just south of the area mapped by Carter (1975). The area is underlain by a mixture of metasedimentary schists, gneisses, migmatitic and granitic rocks of Precambrian age. The occurrence located by the author is south of the metasediments and migmatites, within a hornblende-biotite granite identified by Speed, Mason and Vos (1985). The Gravel River Fault zone is located approximately 6 km north of the occurrence. The fault is the major structural feature in the area and is marked by a 61 m (200 feet) cliff on the north side.
| Rock Type | Rank | Composition | Texture | Relationship | Schist-Unsubdivided | 1 | Near |
|---|---|---|---|---|
| Diatexite Migmatite | 2 | Near | ||
| Granite | 3 | Hbl-Bt Granite | Host |
Dec 07, 2005 (R Degagne) - The occurrence is located within the Quetico Subprovince and is just south of the area mapped by Carter (1975). The area is underlain by a mixture of metasedimentary schists, gneisses, migmatitic and granitic rocks of Precambrian age. The occurrence located by the author is south of the metasediments and migmatites, within a hornblende-biotite granite identified by Speed, Mason and Vos (1985). The Gravel River Fault zone is located approximately 6 km north of the occurrence. The fault is the major structural feature in the area and is marked by a 61 m (200 feet) cliff on the north side.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Calcite | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue |
Dec 07, 2005 (R Degagne) - Speed, Mason and Vos (1985) gave the following description of the occurrence: A large calcite vein occurs on the east-facing side of a steep granite cliff, which is 62 m (200 ft) or more in height. The vein is from 4-5 m (13-16 ft) wide at the base of the exposure. It strikes approximately east-west (N85-90 degrees E) and dips vertically. The vein can be seen exposed about 15 m (50 ft) up the side of the hill where it appears to be thinning slightly. This contact with the country rock of both veins is very sharp. Medium-grained calcite occurs in a 30 cm (12 in) wide zone at the south contact of the main vein. There is then an abrupt change to very coarse-grained calcite crystals. Other changes in crystal size were not observed in the main vein due to a black stain on the calcite. The vein appears to become more quartz-rich towards the north contact. A third narrow calcite vein, about 30 cm (12 in) wide was observed to the north and up the hill from the main vein. This vein appears to strike north 70 degrees east and dips 70-75 degrees north. This vein is very irregular in nature, and in one place contains a couple of centimetres of amethystine quartz on the hanging wall. Chemical Analysis: Industrial Minerals staff obtained sample IM-92-041, samples 131 to 133 were analyses reported by Speed et al (1985). Sample IM-92-041: 1.89 SiO2, 0.06 AI203, 0.20 Fe203, 53.95 CaO, 0.13 Na20, <0.01 K2O, 0.12 MgO, 0.54 MnO, <0.01 TiO2, <0.01 P205, 42.06 LOI. (Analysis conducted by Chemex Labs). Sample 131: 0.81 SiO2, --- AI203, --- Fe203, 61.60 CaO, --- Na20, --- K2O, 0.00 MgO, --- MnO, --- TiO2, --- P205, 41 LOI. Sample 132: 1.56 SiO2, --- Al2O3, --- Fe2O3, 61.10 CaO, --- Na2O, ---- K2O, 0.00 MgO, --- MnO, --- TiO2, --- P205, 40.2 LOI. Sample 133: 5.09 SiO2, --- Al2O3, --- Fe2O3, 52.70 CaO, --- Na2O, --- K2O, 0.00 MgO, --- MnO, --- TiO2, --- P205, 38.7 LOI. (Analyses conducted by Geoscience Labs, OGS).
| Rank | Classification |
|---|---|
| 1 | Metamorphic |
| Rank | Characteristic |
|---|---|
| 1 | Vein |
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Irregular | 15 | 4.5 | 85 | 90 |
Date: Jan 03, 1997
Geologist: R Degagne
Notes: Visited in August, 1992 by P. Hinz | R. M. Landry (OGS OFR 5889, 1994) . COMMENTS/RECOMMENDATIONS: This occurrence was visited by helicopter during the summer of 1992 as part of our Dickison Lake reconnaissance. Although the analyses are quite interesting it should be noted the veins are of limited size and currently inaccessible.
Mono - Industrial Mineral Occurrences and Deposits in Northwest Ontario
Publication Number: OFR5889 Page: 67-70 Date: 1994
Author: Hinz P., Landry R.M.
Publisher Name: Ontario Geological Survey
Location:
Book - Industrial Minerals Geologist's Files, Thunder Bay
Publication Number: Date:
Author:
Publisher Name:
Location: Thunder Bay RGP
Map - Dickison Lake, Thunder Bay District
Publication Number: M2293 Scale: 1:63,360 Date: 1974
Author: Carter M.W.
Publisher Name: Ontario Division of Mines
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 - 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 - Lime resources of the Thunder Bay area
Publication Number: OFR5566 Date: 1985
Author: Speed A.A., Mason J.K., Vos M.A.
Publisher Name: Ontario Geological Survey
Location:
MonoMap - Geology of the Dickison Lake area, District of Thunder Bay
Publication Number: R123 Page: 29 Date: 1975
Author: Carter M.W.
Publisher Name: Ontario Division of Mines
Location:
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For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office