GeologyOntario has moved. You will be redirected to the new site in 10 seconds. If you are not immediately redirected please follow the below link to the new GeologyOntario platform. For assistance please contact us.
Ontario Geological Survey
Permanent Link to this Record:
MDI52H03SE00003
| Record Name(s) | Lundmark Marble Occurrence - 1975, Eaglehead Lake - 1986, Lunmac Marble - 2003, H. Lundmark - 1986, W. McAteer - 1986 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1986-Mar-21 |
| Date Last Modified | 2022-Sep-27 |
| Created By | |
| Revised By |
Primary Commodities: Marble (Building Stone), Magnesium Minerals, Marble (high purity/flux)
Township or Area: Eaglehead Lake Area
Latitude: 49° 3' 43.18" Longitude: -89° 4' 52.69"
UTM Zone: 16 Easting: 347961.999 Northing: 5436433.999 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 52H06SW
Point Location Description: Outcrop
Location Method: Conversion from MDI
Access Description: GENERAL LOCATION: The property is located 58 km NNE of Thunder Bay. A road travels east of Highway 527 from Eaglehead Lake. The west claim group and a trail leads from the baseline on the west group to the east group. ACCESS: Access is gained by bush road, east from Highway 527 (OFR, 5890).
1960s - The area east of Eaglehead Lake was staked a number of times, no work was recorded and the claims were cancelled. 1975 - The occurrence was located and staked by H. Lundmark and W. McAteer of Thunder Bay. Stripping, trenching and geological mapping were conducted. Two claims, TB 434842 and TB 519233, were brought to lease for the purpose of small scale production of ornamental stone. 1994 Currently the two leased claims are still held by H. Lundmark and W. McAteer. No work has been reported on the property in recent years.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.3343 | 52H03SE0003 | 52H03SE0003 |
Province: Southern
Subprovince: Nipigon Basin
Formation Group: Sibley Group
Geological Age: Paleoproterozoic
Dec 07, 2005 (B Schnieders) - The occurrence is hosted in Mesoproterozoic Sibley Group sedimentary rocks which lie unconformably over the Archean basement of metasediments and metavolcanics. The Sibley sediments have been intruded by Keweenawan-age Logan disbase sills. The sedimentary rocks are predominantly clastic with minor limestones and dolomites. Mechanical stripping has exposed 4.5 to 5 m of dolostone which is both overlain and underlain by a purple to reddish-brown mudstone. Within the dolostone horizon three distinct colours are noted: an upper 1.0 to 1.15 m of layered variable colored dolostone; a middle 3 m buff-grey stromatolitic dolostone; and a lower 0.5 m green to brown dolostone with minor grey dolostone (Hinz et al., 1994, OFR 5890, p. 71).
Dec 07, 2005 (W Bellinger) - GENERAL GEOLOGY AND STRUCTURE: The occurrence is hosted in Mesoproterozoic Sibley Group sedimentary rocks which lie unconformably over the Archean basement of metasediments and metavolcanics. The Sibley sediments have been intruded by Keweenawan-age Logan diabase sills. The sedimentary rocks are predominantly clastic with minor limestones and dolomites. Mechanical stripping has exposed 4.5 to 5 m of dolostone which is both overlain and underlain by a purple to reddish-brown mudstone. Within the dolostone horizon three distinct colours are noted: an upper 1.0 to 1.15 m of layered variable coloured dolostone; a middle 3 m blue-grey stromatolitic dolostone; and a lower 0.5 m green to brown dolostone with minor grey dolostone. The occurrence was stripped and exposed in a cliff face. From top to bottom the following sequence is seen: diabase; purple spotted mudstone; grey dolostone; white brucitic marble; and purple spotted mudstone. The white marble reaches a maximum thickness of 2.74 m and is exposed for a strike length of approximately 72 m. At the northwestern end of the exposure, the white marble grades into grey dolostone, while at the southeastern end it is covered by overburden. The grey dolostone is exposed for a strike length of 120 to 180 m and is at least 3 m thick.
| Rock Type | Rank | Composition | Texture | Relationship | Dolomite Marble | 1 | Brucitic | Fine Gr. | Host |
|---|
Dec 07, 2005 (W Bellinger) - COLOUR: The following colour sequence was observed from top to bottom within the occurrence: COLOUR:1 -1.5 m - layered variable-coloured dolostone, -3.0 m - blue-grey stromatolitic dolostone, -0.5 m - green to brown dolostone with some grey dolostone. Locally, the blue-grey dolostone grades into white brucitic marble where it is in contact with diabase. The blue-grey marbles may be removed in fairly large blocks. The physical tests show that the dolostone would be suitable for dimension stone purposes. The main disadvantage of the property is the fact that 5 to 7 m of diabase overlies the dolostone on a cliff face. This factor would ecessitate either extensive development work and waste rock or the use of underground quarrying techniques.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Magnesite | Economic | Ore | ||||
| 2 | Dolomite | Economic | Ore | ||||
| 3 | Calcite | Economic | Ore | ||||
| 1 | Serpentine | Economic | Gangue |
Dec 07, 2005 (W Bellinger) - MINERALOGY: white marble - primarily very fine-grained calcite (65 to 70%) with secondary brucite (30-35%) and minor serpentine as interstitial mineral phases; grey marble - dolomite is predominant with secondary calcite. COLOUR: The following colour sequence was observed from top to bottom within the occurrence: 1 -1.5 m - layered variable-coloured dolostone, -3.0 m - blue-grey stromatolitic dolostone, -0.5 m - green to brown dolostone with some grey dolostone. Locally the blue-grey dolostone grades into white brucitic marble where it is in contact with diabase. The blue-grey marbles may be removed in fairly large blocks. The physical tests show that the dolostone would be suitable for dimension stone purposes. The main disadvantage of the property is the fact that 5 to 7 m of diabase overlies the dolostone on a cliff face. This factor would necessitate either extensive development work and waste rock or the use of underground quarrying techniques. PHYSICAL PROPERTIES: Sample F11-75 - Compressive Strength: 21,200 psi (146.2 MPa), Absorption: 0.19%, Bulk Specific Gravity: 2.58, Modulus of Rupture: 4,400 psi (30.3 MPa). Sample F55-76 - Compressive Strength: 28,193 psi (194.4 MPa), Absorption: 0.23%, Bulk Specific Gravity: 2.82, Modulus of Rupture: 2,783 psi (19.2 MPa), Abrasion Resistance: 26.3. (Testing conducted by Geoscience Laboratories, Mineral Research Branch, Toronto). CHEMICAL ANALYSIS: Sample No. F11-75: 1.40 SiO2, 0.48 Al2O3, 0.12 Fe2O3, --- MnO, 23.4 MgO, 35.2 CaO, --- Na2O, --- K2O, --- TiO2, --- P2O5. Sample No. F55-76: 2.00 SiO2, 0.20 Al2O3, 0.30 Fe2O3, --- MnO, 20.9 MgO, 43.0 CaO, --- Na2O, --- K2O, --- TiO2, --- P2O5.
Map - Disraeli Lake sheet, Thunder Bay District
Publication Number: M2235 Scale: 1:63,360 Date: 1971
Author: Coates M.E.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
Map - Mineral deposits series, Ontario mineral potential, Nipigon sheet, District of Thunder Bay
Publication Number: P1528 Scale: 1:250,000 Date: 1978
Author: Springer J.S.
Publisher Name: Ontario Geological Survey
Location:
Mono - Lime resources of the Thunder Bay area
Publication Number: OFR5566 Page: 24-25, P63-66 Date: 1985
Author: Speed A.A., Mason J.K., Vos M.A.
Publisher Name: Ontario Geological Survey
Location:
Article - Thunder Bay Resident Geologist area, North Central Region
Publication Number: MP128.004 Page: 130 Date: 1997
Author: Patterson G.C., Mason J.K., Schnieders B.R.
Publisher Name: Ontario Geological Survey
Location:
Mono - Dimensional Stone Occurrences and Deposits in Northwest Ontario
Publication Number: OFR5890 Date: 1994
Author: Hinz P., Landry R.M., Gerow M.C.
Publisher Name: Ontario Geological Survey
Location:
Article - 1976 report of the North Central Regional Geologist
Publication Number: MP071.004 Date: 1997
Author: Fenwick K.G., Scott J.F.
Publisher Name: Ontario Geological Survey
Location:
File - Industrial minerals geologist files
Publication Number: IMF Date: 1996
Author:
Publisher Name:
Location: Thunder Bay RGP
File - Thunder Bay Resident Geologist Mineral Deposit Files
Publication Number: Min Dep Date: 1996
Author:
Publisher Name:
Location: Thunder Bay RGP
Mono - Industrial minerals of northern Ontario
Publication Number: MDC026 Date: 1985
Author: Vos M.A., Abolins T., McKnight R.L.W., Smith V.
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