Ontario Geological Survey
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MDI42M12SW00005
| Record Name(s) | Pioneer Lake Occurrence - 9999, Pioneer Gold Mines of B.C. Ltd. Occurrences - 9999, Pioneer Creek Occurrence - 9999, Lornjack Lake Occurrence - 9999, Dempster Occurrence - 9999 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1996-Dec-16 |
| Date Last Modified | 2022-Mar-03 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Reserve Lake Area
Latitude: 51° 35' 21.23" Longitude: -87° 51' 21.56"
UTM Zone: 16 Easting: 440700 Northing: 5715700 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 42M12SW
Point Location Description: Trenching, from OFR 5926 p. 142
Location Method: Data Compilation
Access Description: Located north of Eabamet Lake on Reserve #64 and northeast of the community of Fort Hope (Eabametoong First Nation). Accessible by aircraft. Prior to permission to access the occurrence must be obtained from the Eabametoong first Nation.
1940: Claims were staked in August by Lorne and Jack Dempster for Pioneer Gold Mines of BC Ltd. following the discovery of rusty mineralized zones on the south side of Pioneer Lake. The No. 1 Discovery produced gold on panning. The No. 2 discovery was found independently by the Dempsters and a survey party of the ODM approximately one claim north of the No. 1 Discovery. Stripping, trenching, sampling and prospecting were conducted by the Dempster brothers.
Province: Superior
Subprovince: Uchi
Terrane: North Caribou
Domain: Uchi
Belt: Miminiska-Fort Hope
Geological Age: Neoarchean
Jul 18, 2006 (C Salo) - The geology of the area in the vicinity of this occurrence has been mapped by Prest (1944) and Thurston and Carter (1970). Information from these sources indicates that the Pioneer Lake occurrence is located in an area that is largely underlain by intermediate to mafic metavolcanic and metasedimentary rocks. However, numerous other rock types have also been reported in this area. Prest (1944) refers to the metasedimentary rocks north of Pioneer Creek as Timiskaming conglomerate and notes that the intermediate to mafic metavolcanic rocks near the creek have undergone significant carbonatization. White weathering rhyolites, porphyry dikes and gabbroic intrusive rocks were also described in this area. The Pioneer Lake occurrence is located in close proximity to two significant northeasterly-trending faults mapped by Prest (1944). A north-south striking fault was also interpreted to be present in the area. It is probable that the occurrence of the gold mineralized vein system in this location was associated with the migration of hydrothermal fluids through one or more of these fault structures.
| Rock Type | Rank | Composition | Texture | Relationship | Vein | 1 | Quartz | Host |
|---|---|---|---|---|
| Mafic Tuff | 2 | Tuffs | Near | |
| Porphyry-unsubdivided | 3 | Granite With Quartz Eyes | Near |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrrhotite | Economic | Ore | ||||
| 2 | Pyrite | Economic | Ore | ||||
| 3 | Arsenopyrite | Economic | Ore | ||||
| 4 | Gold | Economic | Ore | ||||
| Carbonate | Alteration | Carbonatization | 1 | Strong |
Jul 18, 2006 (C Salo) - The Pioneer Lake occurrence consists of two showings (No. 1 and No. 2 discoveries) documented by Prest (1944). The No. 1 discovery was located on the south side of Pioneer Lake and is poorly documented, although favourable gold assays were reported to have been obtained from this occurrence. The No. 2 discovery was located one claim north of Pioneer Lake, and is described as being hosted in a quartz vein up to 12 feet wide and over 300 feet long. Additional gold-bearing zones associated with quartz stringers parallel to the volcanic host rock schistosity were also documented. Vein mineralization was reported to include quartz, carbonate, arsenopyrite, pyrite and occasional pyrrhotite. It is important to note that the gold at this location was only found in veins that were mineralized with arsenopyrite. Prest (1944) also noted that the mineralization was located adjacent to a porphyry dike that caused an appreciable magnetic disturbance. Extensive iron carbonate alteration was also noted in the volcanic host rocks.
Jul 18, 2006 (C Salo) - Extensive carbonitization of volcanic host rocks.
| Rank | Classification |
|---|---|
| 2 | Lode (Gold) |
| 1 | Vein |
| Rank | Characteristic |
|---|---|
| 2 | Concordant |
| 1 | Vein |
Map - Fort Hope area, District of Kenora (Patricia Portion), Ontario
Publication Number: ARM51B Scale: 1:63,360 Date: 1997
Author: Prest V.K.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Mineral Occurrences and Prospects in the Fort Hope-Winisk Area
Publication Number: OFR5926 Scale: Date: 1995
Author: Mason J.K., White G.D.
Publisher Name: Ontario Geological Survey
Location:
Part - Geology of the Fort Hope gold area, District of Kenora (Patricia Portion)
Publication Number: ARV38-02.001 Scale: Date: 1998
Author: Burwash E.M.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Fort Hope-Lansdowne House sheet, geological compilation series, Cochrane, Kenora, and Thunder Bay districts
Publication Number: M2237 Scale: 1:253,440 Date: 1972
Author: Thurston P.C., Carter M.W., Riley R.A.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
Part - Geology of the Fort Hope area
Publication Number: ARV51-03.001 Scale: Date: 1997
Author: Prest V.K.
Publisher Name: Ontario Dept. of Mines
Location:
Book - OPERATION FORT HOPE
Publication Number: MP042 Scale: Date: 1970
Author: Thurston, P.C. and Carter, M.W.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
Map - Geological Compilation of the Miminiska-Fort Hope Area, Eastern Uchi Domain
Publication Number: P3611 Scale: 1:250,000 Date: 2009
Author: Madon Z.B., McIlraith S.J., Stott G.M.
Publisher Name: Ontario Geological Survey
Location:
Map - Fort Hope area, District of Kenora (Patricia Portion), Ontario
Publication Number: ARM38B-01 Scale: 1:190,080 Date: 1997
Author: Burwash E.M.
Publisher Name: Ontario Dept. of Mines
Location:
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