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Ontario Geological Survey
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MDI41P14NE00003
| Record Name(s) | Chevron DDH T 83-2 - 1983, Allerston Option - 1975 |
|---|---|
| Related Record Type | Simple |
| Record Status | Occurrence |
| Date Created | 1991-Feb-15 |
| Date Last Modified | 2021-Dec-13 |
| Created By | Q Unknown |
| Revised By | A Wilson |
Primary Commodities: Zinc
Secondary Commodities: Gold, Copper
Township or Area: Halliday
Latitude: 47° 53' 54.39" Longitude: -81° 11' 25.4"
UTM Zone: 17 Easting: 485770.002 Northing: 5305030.005 UTM Datum: NAD83
Resident Geologist District: Timmins
NTS Grid: 41P14NE
Point Location Description: approximate
Location Method: Based on Assessment
1983: Chevron Standard Ltd. - DD - 1- 616 ft.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| T-2573 | 41P14NE0064 | 41P14NE0064 |
Province: Superior
Subprovince: Abitibi
Terrane: Wawa-Abitibi
Belt: Abitibi
Geological Age: Neoarchean
| Rock Type | Rank | Composition | Texture | Relationship | Felsic Tuff-Breccia | 1 | Rhyolite | Debris Flow, Tuff Breccia | Near |
|---|---|---|---|---|
| Claystone | 2 | Siliceous, Graphitic, Pyritic | Host | |
| Intermediate lava flow-unsubdivided | 3 | Dacite | Flow, Jig Saw Breccia And Autobreccia | Near |
| Vein | 4 | Quartz | Host |
Aug 26, 2010 (A Wilson) - T-83-2 collared at 8.53 m in a dacitic flow breccia. This unit is both quartz and feldspar porphyritic with the phenocrysts occurring both in the fragments and the matrix. Minor pyrite occurs in the matrix primarily along the fragment boundaries. At 32.84 m, the hole passed into a massive, but fractured portion of the dacite flow. This unit may also be described as a jigsaw breccia. The matrix is dark grey and siliceous, similar to the argillite intersected down hole. At 65.53m the hole passes back into the autobreccia though the matrix is dark grey and argillaceous. At 84.48m the hole passed into dark grey siliceous argillite containing 10% to 40% pyrite nodules and clasts. Locally the pyrite appears interbedded with the argillite. At 124.66 m pyrite concentrations increase to about 80% over 10 m thought the nodular and bedded textures remain. At 135.33 m the argillite becomes very graphitic, pyrite content decrease to less than 25% and the unit is cut be quartz veins and is possibly interlayered with white chert. Locally it is difficult to determine between vein and chert quartz. A wavy-banded quartz vein (black and white) cut from 142.08m to 143.03m contains patches of reddish brown to orangey- brown sphalerite and traces of chalcopyrite and less than 5% pyrite.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Sphalerite | Economic | Ore | ||||
| 2 | Chalcopyrite | Economic | Ore | ||||
| 1 | Pyrite | Economic | Gangue | ||||
| Quartz | Alteration | Silicification | 1 | Medium | Replacement |
Aug 26, 2010 (A Wilson) - The best assays from DDH T-83-2 were 0.01 oz/t Au, 0.2 ppm Ag, 25 ppm AS, 318 ppm Cu and 5300 ppm Zn over 2.2 feet within a quartz veined and wavy banded quartz vein containing up to 4% pyrite within a graphitic shear zone.
Aug 26, 2010 (G Seim) - Silicification is persistent throughout the drill hole. It is particularly intense downhole of the intersection in the felsic debris flow.
| Rank | Classification |
|---|---|
| 1 | Hydrothermal |
| 2 | Volcanogenic |
| Rank | Characteristic |
|---|---|
| 2 | Stratabound |
| 1 | Vein |
Date: Jun 28, 2000
Geologist: G Seim
Notes: G. Seim examined the core from this T-83-2 on June 27 and 28, 2000. The core is stored at the Timmins Offsite Drill core storage area. Hole description continues from the Geology Section. At 135.33 m the argillite becomes very graphitic (able to write on paper with the core.), pyrite content decrease to less than 25% and the unit is cut be quartz veins and is possibly interlayered with white chert. Locally it is difficult to determine between vein and chert quartz. A wavy-banded quartz vein (black and white) cut from 142.08m to 143.03m contains patches of reddish brown to orangey brown sphalerite and traces of chalcopyrite and less than 5% pyrite. This interval returned an assay of 5300 ppm Zn and 318 ppm Cu. The lower contact to the intersection and the argillite is a porphyritic intermediate dike that contains less than 2% pyrite. From 145.08m to the end of the hole at 187.76 m, a silicified felsic debris flow was cored. This unit started with a high percentage of argillite clast and down hole consists of predominantly felsic clasts in a felsic matrix. Through much of the section pyrite clasts and disseminations make up 10% to 15% of the core. This unit may locally contain traces of sphalerite, though this section was not split nor assayed. An interval from 149.96 m to 155.45 m contains considerably less sulphide clasts and may be indicative of bedding. This unit is pervasively though variably silicified throughout. Locally the fragments are difficult to discern from the matrix.
MonoMap - Geology of Halliday and Midlothian townships, districts of Sudbury and Timiskaming
Publication Number: R079 Scale: Date: 1970
Author: Bright E.G.
Publisher Name: Ontario Dept. of Mines
Map - Halliday and Midlothian townships, Sudbury and Timiskaming districts
Publication Number: M2187 Scale: 1:31,680 Date: 1970
Author: Bright E.G.
Publisher Name: Ontario Dept. of Mines
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For detailed information regarding this mineral record please contact the Timmins Resident Geologist District Office