Ontario Geological Survey
Permanent Link to this Record:
MDI42D14SE00051
| Record Name(s) | Gold Range Diatreme - 1982, Gold Range Conglomerate - 1930 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 1991-Mar-31 |
| Date Last Modified | 2022-May-09 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Secondary Commodities: Diamond, Uranium, Sulphur/Pyrite
Township or Area: Priske
Latitude: 48° 48' 12.01" Longitude: -87° 12' 30.02"
UTM Zone: 16 Easting: 484701.69 Northing: 5405614.84 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42D14SE
Point Location Description: Outcrop
Location Method: Conversion from MDI
Access Description: The Gold Range Diatreme is located approximately 4 to 5 km east of the Township of Schreiber in Priske Township (claim map G 631). The access and location are described by Sage (1982): The Gold Range diatreme is located northeast of Schreiber, Ontario. The breccia can be reached by walking north along a claim line which crosses a trail (Figure 2) leading the the west side of the Ontario Hydro reservoir located east of Schreiber. The claim line cuts the trail 660 m west of the reservoir. The breccia is 248 m north of the trail and approximately 36 m west of the claim line. Lamont Lake is located at Latitude 48?49'N and Longitude 87?14'W and the breccia is located approximately 1.6 km east of the lake.
1930s: During the 1930s, the breccia or conglomerate was discovered during gold prospecting. The occurrence was originally promoted as a gold/conglomerate-gold related occurrence. 1938: The area was mapped by G.A. Harcourt for the Ontario Department of Mines. 1982: A detailed study of the diatreme structure was performed by R. Sage of the Ontario Geological Survey
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Belt: Schreiber-Hemlo
Geological Age: Archean
Dec 07, 2005 (B Nelson) - The general geology consists of metavolcanic and metasedimentary rocks which have been intruded by granitic rocks at the Terrace Bay Batholith. The metavolcanic rocks include mafic to intermediate pillowed flows and massive flows, with minor intercalated felsic flows. The metasedimentary rocks are predominantly composed of wacke, siltstones and slate of turbiditic origin. Iron formation, consisting of chert, massive pyrite sections and graphitic pyritic slate is also present. The rocks in the Harkness Hays Gold Range area have been intensely faulted and fractured. This is evident on top of the Gold Range Ridge. Airphoto interpretation indicates a conjugate set of faults striking northeast and northwest. The northwest striking fault set has apparently offset the Gold Range Ridge, in a dextral sense, up to 0.5 km. There are two prominent lineaments or faults striking northeast that envelope the old development area. Within this 0.5 km by 1 km section smaller conjugate fault systems strike northwest, east and northeast. In excess of 25 small scale lineaments were observed. Field evidence indicates that many of these lineaments represent faults. The vein systems occupying these faults are often brecciated. Harcourt (1939) described the general geology as: On claim TB 3411...an outcrop of conglomerate or pseudo conglomerate 1 chain by 2 chains in area is apparently completely isolated from other sediments. The rock is made up of fragments or rhyolite, greenstone, iron formation, and granite, some apparently well rounded, others sharply angular. The rock is intruded by a body of lamprophyre on one side and is surrounded by grey rhyolite. A polished slab of rock shows that the fragments are nearly all angular and that at least some of the round surfaces are due to a conchoidal fracture in the fragments. The matrix is now composed very largely of quartz and sulphides.
| Rock Type | Rank | Composition | Texture | Relationship | Mafic massive flow | 1 | Massive Flow | Near |
|---|---|---|---|---|
| Mafic pillowed flow | 2 | Pillowed Flow | Near | |
| Intermediate massive flow | 3 | Massive Flow | Near | |
| Intermediate pillowed flow | 4 | Pillowed Flow | Near | |
| Felsic lava flow-unsubdivided | 5 | Rhyolite | Flow | Host |
| Sandstone | 6 | Wacke | Near | |
| Siltstone | 7 | Near | ||
| Mudstone | 8 | Slate | Near | |
| Ironstone-unsubdivided | 9 | Ch-Py | Near | |
| Mudstone | 10 | Gf-Py Slate | Near | |
| Breccia-unsubdivided | 11 | Host | ||
| Biotite Lamprophyre | 12 | Biotite | Near |
Dec 07, 2005 (B Nelson) - The breccia occurs at the margin of a relatively large body of biotite rich lamprophyre which contains large inclusions of iron formation and quartz monzonite. The lamprophyre locally contains rounded blebs of carbonate and visible interstitial carbonate. The close spatial relationship of the breccia and lamprophyre suggests that the breccia may be a result of local, relatively high level release of volatiles form the intruding carbonate bearing lamprophyric magma. The breccia consists dominantly of angular to subangular clasts of cherty ironstone and pink fine grained quartz monzonite. The breccia is cemented with quartz and pyrite. In thin sections chert is seen to occur as angular composite aggregates in which individual quartz grains display undulatory extinction and sutured grain boundaries. Sericite forms very fine grained flakes along fractures and between grains. Some of the mica is stained brown. Chlorite, possibly after amphibole, forms aggregates with angular outlines which may be relicts of clasts derived from the enclosing metavolcanics.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrrhotite | Economic | Ore | ||||
| 2 | Pyrite | Economic | Ore | ||||
| 1 | Magnetite | Economic | Gangue | ||||
| 2 | Quartz | Economic | Gangue | ||||
| Quartz | Alteration | Silicification | 1 | Unknown | Disseminated |
Dec 07, 2005 (B Nelson) - *Holbrooke (1939) described the economics as: The owners of the property reported values up to $7.00 across this conglomerate zone, but careful check sampling showed only trace. This showing is not to be recommended. Sage (1982) states: A large sample of pyrite bearing breccia was assayed for gold and examined by 30 element spectrographic analysis. The sample returned 0.01 ounce gold per ton and the spectrographic analysis failed to detect anything of economic interest. Analyses by Resident Geologist personnel returned the following results: Diatreme 1: <0.01 oz/ton Au and <0.10 oz/ton Ag from dark, magnetite-rich, banded iron formation containing quartz veins. Rhyolite: 0.01 oz/ton Au and <0.10 oz/ton Ag from rhyolite with minor sulphides. Breccia: <0.01 oz/ton Au and <0.10 oz/ton Ag from heterolithic breccia in amphibolite, with visible granite clasts.
Jun 29, 2018 (Therese Pettigrew) - The breccia is not radioactive, with average spectrometer readings being only 1600 counts per minute. The highest spectrometer readings came from the quartz monzonite, which had an average of 4120 counts per minute (Sage, 1982).
Date: Feb 17, 1997
Geologist: B Nelson
Notes: Resident Geologist personnel visited the showing June 13 and 14, 1985.
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 - Mineralization in diatreme structures north of Lake Superior
Publication Number: S027 Page: 4-0 Date: 1982
Author: Sage R.P.
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:
File - Resident Geologist Mineral Deposit Files
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: 340-346 Date: 1996
Author: Schnieders B.R., Smyk M.C., Speed A.A., McKay D.B.
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:
Map - Geological series, Precambrian geology of the Schreiber area, east part, Thunder Bay District
Publication Number: P2391 Scale: 1:15,840 Date: 1981
Author: Carter M.W.
Publisher Name: Ontario Geological Survey
Location:
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