Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI31F01NE00043

Record: MDI31F01NE00043

General

Commodities

Primary Commodities: Lead, Copper

Secondary Commodities: Zinc

Location

Township or Area: Ramsay

Latitude: 45° 8' 16.04"    Longitude: -76° 12' 25.21"

UTM Zone: 18    Easting: 405097.97   Northing: 4998965.86    UTM Datum: NAD83

Resident Geologist District: Southern Ontario

NTS Grid: 31F01NE

Point Location Description: Square symbol Pb 25, about 5 km west of Town of Carleton Place.

Location Method: Data Compilation

Access Description: The occurrence is approximately 5.6 km west of the town of Carleton Place. It is accessible by gravel concession roads.

Exploration History

1858: work by unknown operators. Shaft sunk 37 feet, 450 feet vein material mined - 26 tons ore yielding 80%t Pb obtained. A second shaft sunk 21 feet 1863: one of previous shafts deepened to 90 feet by Ramsay Lead Mining and Smelting Co. 1925-26: prospecting, surface work, some diamond drilling by Ottawa Valley Syndicate 1951: property acquired by Deseco Mines Ltd.- surface work, construction of mill, no production

Geology

Province: Paleozoic and Mesozoic Basins

Subprovince: Central St. Lawrence Lowland

Lithology

Lithology Comments

Oct 16, 2017 (A Wilson) - Calcareous metasediments enclose Ag in an east-striking vein which was traced for more than ½ mile and assayed 3 to 4 oz. Au/ton, approximately 20 oz. Ag/ton and 60% Pb. Circa 1890. The Ramsay lead deposit consists of 2 separate properties. The deposit on Con. VII is the former Deseco Mines Ltd. property and consists of a network of narrow galena-bearing calcite veins in a zone 200 feet wide and 2,300 feet long (Alcock 1930, p. 141). The deposit on Con. VI consists of a single galena-bearing calcite vein 2½ to 5 feet wide with an ore-bearing portion 8 to 24 inches wide and fades out a depth below the Paleozoic-Late Precambrian unconformity (Alcock 1930, p. 141). This vein is at least 90 m in length. There is minor sphalerite and pyrite in both deposits. A selected sample of typical mineralized material collected on Con. VII, Lot 3 contained 5.30% Pb and trace Ag. Workings on Con. VI consist of a single trench about 45 m long, up to 1.5 m wide, and up to 3 m depth where it isn't filled with garbage. Workings on Con. VII consist of a large shallow pitted area 15 m by 30 m and up to 2.1 m deep, and a trench 30 m long, up to 3 m wide and 1.8 m deep where not filled with refuse. The Ramsay lead deposit is contained within Ordovician limestone near the Late Precambrian- Paleozoic contact. The limestone is a flat lying, very fine-grained, buff-to-grey rock that overlies Potsdam sandstone of late Cambrian age which, in turn, unconformably overlies the Late Precambrian basement complex.

Mineralization

Mineralization Comments

Oct 16, 2017 (A Wilson) - The mineralization is hosted by two calcite veins or vein networks that cut the Ordovician limestone. The main vein, on Lot 3, Con. VI, strikes N50W and dips steeply to the northeast. On Lot 3, Con. VI, there is a network of narrow veins of white to pink calcite. Mineralization consists of coarse, erratically distributed grains of galena and minor sphalerite, pyrite, and chalcopyrite. Discussion: This deposit is similar to the other deposits in this group in the study area and to other vein lead deposits close to the Paleozoic margin of the Late Precambrian basement rocks. This is the only deposit of this group that is contained in fractures within the Paleozoic cover rather than the Late Precambrian basement. A discussion of the genesis of this deposit type is contained in the introductory section to this report. The most significant features of rock associations and ore localization are outlined below: - deposit occurs close to the Late Precambrian-Paleozoic unconformity - mineralization occurs in fracture filling veins with a general northwesterly trend, which appear to be related to the development of the Ottawa graben - the widest and best mineralized veins occur as fracture fillings in marbles. The width may be the result of a competency difference between the host rock units during faulting. Deposition of mineralization in the marbles may be the result of their chemical reactivity. - mineralization appears to be restricted to areas where basal Paleozoic sandstone forms the unconformity with basement. With an impermeable caprock these may have acted as aquifers for groundwater flow and a source for metal. A combination of the factors would appear to present a well defined exploration target for this deposit type in an area with abundant fracturing and favourable host units. While they may not be expected to be of very large extent, they must be considered economically significant.

Mineral Record Details

References

Mono - Metallogeny of the Grenville Province, southeastern Ontario

Publication Number: OFR5515 Page: 158  Date: 1984

Author: Carter T.R.

Publisher Name: Ontario Geological Survey

Location:

Mono - Gold deposits of Ontario, part 2, part of District of Cochrane, districts of Muskoka, Nipissing, Parry Sound, Sudbury, Timiskaming, and counties of southern Ontario

Publication Number: MDC018 Page: 46  Date: 1979

Author: Gordon J.B., Lovell H.L., de Grijs J.W., Davie R.F.

Publisher Name: Ontario Geological Survey

Location:

MonoMap - Geology of base metal, precious metal, iron, and molybdenum deposits in the Pembroke-Renfrew area

Publication Number: MDC020 Page: 57-58  Date: 1980

Author: Carter T.R., Colvine A.C., Meyn H.D.

Publisher Name: Ontario Geological Survey

Location:

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For detailed information regarding this mineral record please contact the Southern Ontario Resident Geologist District Office