Ontario Geological Survey
Permanent Link to this Record:
MDI42F04NW00008
| Record Name(s) | Geco - 1953 |
|---|---|
| Related Record Type | Partial |
| Related Record(s) | |
| Record Status | Past Producing Mine Without Reserves or Resources |
| Date Created | 1984-Nov-02 |
| Date Last Modified | 2022-Mar-21 |
| Created By | |
| Revised By |
Primary Commodities: Copper, Zinc
Secondary Commodities: Lead, Silver, Gold, Cadmium, Tin, Sulphur/Pyrite
Township or Area: Gemmell
Latitude: 49° 9' 18.61" Longitude: -85° 47' 22.04"
UTM Zone: 16 Easting: 588266 Northing: 5445411 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42F04NW
Point Location Description: Precise
Location Method: Other
1931: Discovered by J.E. Thompson of the Ontario Department of Mines. 1953-57: Geco Mines Ltd. conducted surface work, considerable diamond drilling (in excess of 139 DDH totalling 22,836.5 m from surface and 5131 holes totalling 348,817 m from underground), and underground development, with drifting and cross cutting for all shafts totalling 86,317.5 m. 1957: production began, with an original mill capacity of 3300 tons per day. 1964: Geco Mines Ltd. merged with Noranda Mines Ltd. 1970: mill capacity increased to 5000 tons per day. 1995: mine closed.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 14 | 42F04NW0073 | 42F04NW0073 |
| 2.17563 | 42F04NW0093 | 42F04NW0093 |
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Belt: Schreiber-Hemlo
Geological Age: Archean
Jun 22, 2018 (Therese Pettigrew) - The Geco orebody lies in a dragfold on the S limb of the Manitouwadge syncline. The dragfold strikes E-W and plunges 45E. The ore host rock is a quartz-muscovite schist lying between biotite gneiss and quartzite to the S and biotite-garnet-amphibole gneiss to the N.
| Rock Type | Rank | Composition | Texture | Relationship | Schist-Unsubdivided | 1 | Sillimanite-Muscovite-Quartz | Host |
|---|---|---|---|---|
| Ironstone-unsubdivided | 2 | Adjacent |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Pyrrhotite | Economic | Ore | ||||
| 3 | Chalcopyrite | Economic | Ore | ||||
| 4 | Sphalerite | Economic | Ore | ||||
| 5 | Galena | Economic | Ore |
Jun 22, 2018 (Therese Pettigrew) - The main orebody is enveloped by a sillimanite-muscovite-quartz schist and quartzite. The main ore is consists of massive zinc-copper-lead sulphides that have been recrystallized during metamorphism. There is a halo of stringer chalcopyrite mineralization around the main ore body hosted in sillimanite-muscovite-quartz schist. The sillimanite-muscovite-quartz schist has been dated at 2720±2Ma Lodge, 2012). The ore deposit consists of a tabular body of sulphides (pyrite, pyrrhotite, chalcopyrite and sphalerite) surrounded by an envelope of disseminated sulphides (chiefly pyrite and chalcopyrite). The tabular body occupies a fault parallel to the axial plane of the drag fold and rakes 42E. Pre-mineral quartz diorite dykes, pegmatite and granite and post-mineral diabase dykes, intrude the ore zone area. The orebody is displaced left laterally about 76 m along the N-striking Fox Creek Fault. The orebody has a length of about 731.5 m and ranges in width from 3 to 61 m, averaging 19.8 m. The dip is steep to vertical (Shklanka, 1969).
| Rank | Classification |
|---|---|
| 1 | VMS Base Metal |
| Zone | Year | Category | Tonnes | Reference | Comments | Commodities |
|---|---|---|---|---|---|---|
| Geco Mine | 1994 | Proven | 1054000 | Canadian Mines Handbook 1995-96, p. 265 | Average grade of 2.0% Cu, 2.6% Zn, and 1.31 opt Ag. Reserves scheduled to be depleted by late 1995. | Copper 2.0 Percent, Silver 1.31 Ounce per Ton, Zinc 2.6 Percent |
| Geco Mine | 1970 | Unclassified | 26489794 | Thunder Bay RGP mineral deposit files | Reserves were estimated to be 29,200,000 short tons with an average grade of 2.03% Cu, 4.63% Zn, and 1.90 opt Ag. | Copper 2.03 Percent, Silver 1.9 Ounce per Ton, Zinc 4.63 Percent |
| Geco Mine | 1957 | Unclassified | 13431595 | Pye, 1960, p. 82 | Ore reserves were estimated to be 14,806,200 t with an average grade of 1.76% Cu, 3.75% Zn, and 1.74 opt Ag. | Copper 1.76 Percent, Silver 1.74 Ounce per Ton, Zinc 3.75 Percent |
| Year | Tonnes | Commodities | Reference | Comment |
|---|---|---|---|---|
| 1957 | 314692 | Thunder Bay RGP mineral deposit files | 346,889 t milled for 15,482,602 lb Cu, 7,041,644 lb Zn, 378,111 oz Ag, and 1,667 oz Au | |
| 1958 | 1166757 | Thunder Bay RGP mineral deposit files | 1,286,129 t milled for 59,817,197 lb Cu, 33,876,573 lb Zn, 1,423,381 oz Ag, and 7,099 oz Au | |
| 1959 | 1170521 | Thunder Bay RGP mineral deposit files | 1,290,279 t milled for 50,874,609 lb Cu, 35,350,471 lb Zn, 1,295,349 oz Ag, and 5,706 oz Au | |
| 1960 | 1173967 | Thunder Bay RGP mineral deposit files | 1,294,077 t milled for 42,748,394 lb Cu, 43,648,366 lb Zn, 1,321,618 oz Ag, and 5,071 oz Au | |
| 1961 | 1158274 | Thunder Bay RGP mineral deposit files | 1,276,778 t milled for 36,435,890 lb Cu, 764,883 lb Pb, 65,123,549 lb Zn, 1,450,626 oz Ag, and 4,399 oz Au | |
| 1962 | 1163386 | Thunder Bay RGP mineral deposit files | 1,282,414 t milled for 43,096,185 lb Cu, 1,865,594 lb Pb, 90,078,273 lb Zn, 2,001,359 oz Ag, and 4,745 oz Au | |
| 1963 | 1162253 | Thunder Bay RGP mineral deposit files | 1,281,165 t milled for 44,927,302 lb Cu, 3,077,251 lb Pb, 110,354,423 lb Zn, 2,388,298 oz Ag, 4,499 oz Au, and 14,168,000 lb S | |
| 1964 | 1178705 | Thunder Bay RGP mineral deposit files | 1,299,300 t milled for 48,785,514 lb Cu, 3,421,081 lb Pb, 113,810,261 lb Zn, 2,194,874 oz Ag, 3,899 oz Au, 187,609 lb Cd, and 51,228,000 lb S | |
| 1965 | 1203254 | Thunder Bay RGP mineral deposit files | 1,326,360 t milled for 47,023,640 lb Cu, 1,921,043 lb Pb, 75,528,657 lb Zn, 1,960,648 oz Ag, 3,986 oz Au, 209,724 lb Cd, and 33,712,000 lb S | |
| 1966 | 1324114 | Thunder Bay RGP mineral deposit files | 1,489,586 t milled for 52,421,184 lb Cu, 1,638,631 lb Pb, 83,245,844 lb Zn, 2,159,374 oz Ag, 4,649 oz Au, 115,937 lb Cd, and 50,614,000 lb S | |
| 1967 | 1325236 | Thunder Bay RGP mineral deposit files | 1,460,823 t milled for 54,453,351 lb Cu, 2,211,594 lb Pb, 72,867,832 lb Zn, 2,150,061 oz Ag, 4,881 oz Au, 281,456 lb Cd, and 49,570,000 lb S | |
| 1968 | 1356576 | Thunder Bay RGP mineral deposit files | 1,495,369 t milled for 60,422,664 lb Cu, 2,464,692 lb Pb, 98,555,087 lb Zn, 2,403,313 oz Ag, 4,874 oz Au, 350,029 lb Cd, and 64,788,000 lb S | |
| 1969 | 1197129 | Thunder Bay RGP mineral deposit files | 1,319,609 t milled for 60,683,381 lb Cu, 1,738,137 lb Pb, 88,534,585 lb Zn, 2,300,369 oz Ag, and 4,844 oz Au, 404,418 lb Cd, and 65,904,000 lb S | |
| 1970 | 1239374 | Thunder Bay RGP mineral deposit files | 1,366,176 t milled for 46,601,538 lb Cu, 1,923,355 lb Pb, 75,147,693 lb Zn, 1,795,535 oz Ag, and 3,925 oz Au | |
| 1971 | 1596645 | Thunder Bay RGP mineral deposit files | 1,760,000 t milled for 37,700 t Cu, 79,200 t Zn, and 2,593,600 oz Ag | |
| 1972 | 1646540 | Thunder Bay RGP mineral deposit files | 1,815,000 t milled for 36,000 t Cu, 61,300 t Zn, and 2,530,000 oz Ag | |
| 1973 | 1328118 | Thunder Bay RGP mineral deposit files | 1,464,000 t milled for 22,900 t Cu, 34,500 t Zn, and 1,684,000 oz Ag | |
| 1974 | 1657427 | Thunder Bay RGP mineral deposit files | 1,827,000 t milled for 29,200 t Cu, 71,000 t Zn, and 2,058,600 oz Ag | |
| 1975 | 1529513 | Thunder Bay RGP mineral deposit files | 1,599,000 t milled for 27,400 t Cu, 44,500 t Zn, and 1,680,000 oz Ag | |
| 1976 | 1529513 | Thunder Bay RGP mineral deposit files | 1,686,000 t milled for 26,300 t Cu, 32,500 t Zn, and 1,589,000 oz Ag | |
| 1977 | 1591202 | Thunder Bay RGP mineral deposit files | 1,754,000 t milled for 31,600 t Cu, 34,800 t Zn, 386 t Pb, and 1,531,000 oz Ag | |
| 1978 | 1572151 | Thunder Bay RGP mineral deposit files | 1,733,000 t milled for 24,500 t Cu, 28,200 t Zn, 624 t Pb, and 1,383,200 oz Ag | |
| 1979 | 1475990 | Thunder Bay RGP mineral deposit files | 1,627,000 t milled for 27,000 t Cu, 41,700 t Zn, 580 t Pb, and 1,930,900 oz Ag | |
| 1980 | 1358056 | Thunder Bay RGP mineral deposit files | 1,497,000 t milled for 20,000 t Cu, 41,900 t Zn, 780 t Pb, and 1,750,800 oz Ag | |
| 1981 | 1329933 | Thunder Bay RGP mineral deposit files | 1,466,000 t milled for 25,000 t Cu, 38,800 t Zn, 180 t Pb, and 1,386,000 oz Ag | |
| 1982 | 1350798 | Thunder Bay RGP mineral deposit files | 1,489,000 t milled for 21,840 t Cu, 44,150 t Zn, 480t Pb, and 1,345,000 oz Ag | |
| 1983 | 1247379 | Thunder Bay RGP mineral deposit files | 1,375,000 t milled for 20,190 t Cu, 40,810 t Zn, 540 t Pb, and 1,344,000 oz Ag | |
| 1984 | 1253729 | Thunder Bay RGP mineral deposit files | 1,382,000 t milled for 23,030 t Cu, 36,440 t Zn, 380 t Pb, and 1,404,000 oz Ag | |
| 1985 | 1304532 | MP134, p. 76 | 1,438,000 t (short) milled for 22,240t Cu, 35,040 t Zn, 280 t Pb, and 1,325,000 oz Ag | |
| 1987 | 1063296 | MP138 p. 142 | 1,172,083 t (short) milled at 1.75% Cu, 4.92% Zn, and 1.77 opt Ag from January 1987 until Oct 31, 1987 | |
| 1988 | 807049 | MP142, p. 133 | 889,619 t (short) milled from January 1988 to July 31, 1988 | |
| 1989 | 1286493 | MP147, p. 139 | 1,418,116 t (short) milled at 1.82% Cu, 3.40% Zn, and 1.53 opt Ag from July 30, 1988 to July 30, 1989 | |
| 1990 | 989102 | MP152, p. 144 | 1,090,298 t (short) milled at 2.00% Cu, 4.47% Zn, and 1.54 opt Ag from January 1990 to Oct 31, 1990 | |
| 1991 | 1193220 | MP158, p. 125 | 1,315,300 t (short) milled at 1.64% Cu, 3.61% Zn, and 1.33 opt Ag from July 1, 1990 to July 1, 1991 | |
| 1992 | 1205930 | MP161, p. 126 | 1,329,310 t (short) milled at 1.91% Cu, 2.34% Zn, and 1.29 opt Ag from January 1, 1992 to Dec 31, 1992 | |
| 1993 | 1145042 | OFR5892, p. 80 | 1,262,193 t (short) milled at 1.70% Cu, 2.15% Zn, and 1.11 opt Ag | |
| 1994 | 798761 | OFR5921, p. 71 | 880,483 t (short) milled at 2.15% Cu, 3.17% Zn, and 1.51 opt Ag | |
| 1995 | 794153 | OFR5943, p. 78 | 875,404 t (short) milled at 2.17% Cu, 3.66% Zn, and 1.51 opt Ag | |
| 1995 | 54518080 | 1993 production values plus 1994 and 1995 values | Produced 54.5 Mt of Cu-Zn ore before its closure in November 1995. | |
| 1993 | 52762193 | Mckay DB, 1994, OFR 5906, Mineral Occurrences of the Manitouwadge Area, p12. Mine closed Nov 1995. | Production as of Dec 1993: 52,762,193 t @ 1.84% Cu, 3.80% Zn, 1.64 oz/t Ag. Reserves as of Dec 1993: 2,940,000 t @ 1.70% Cu, 2.15% Zn, 1.35 oz/t Ag |
Mono - Copper, nickel, lead and zinc deposits of Ontario
Publication Number: MDC012 Scale: Date: 1969
Author: Shklanka R.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Winston Lake and Manitouwadge Revisted: Modern Views of Two Volcanogenic Massive Sulphide (VMS)-Endowed Greenstone Belts. A Field Trip Guidebook
Publication Number: OFR6282 Scale: Date: 2012
Author: Lodge R.W.D.
Publisher Name: Ontario Geological Survey
Location:
Part - Geology of the Manitouwadge area
Publication Number: ARV66-08 Scale: Date: 1997
Author: Pye E.G.
Publisher Name: Ontario Dept. of Mines
Location:
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