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International Mine (Barrie syndicate), Barrie Township, Frontenac Co., Ontario, Canada

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Latitude & Longitude (WGS84): 44° 52' 27'' North , 77° 3' 30'' West
Latitude & Longitude (decimal): 44.8741666667, -77.0583333333
 
Worked in 1902 & 1903 by two shafts 9 m and 35 m deep, and several test pits. All are located below a power line.

The O.D.M. geological compilation map
2053 (Hewitt, 1964) indicates that the occurrence is
situated within an extensive northeast trending sequence of
marbles, quartzose metasedimentary rocks and mafic volcanic
rocks which passes through the south part of Barrie
township. The rocks are tightly folded and the axial
traces and bedding orientations are conformable with the
regional trend. Meen (1944, p.42) states: "The workings
lies near the contact of Grenville dolomite and greywacke,
which strike N56 0 E and dip 80 0 N. A strong shear zone in
the greywacke is exposed ... and probably indicates a
fault. No displacement was observed. 11 . Carter describes
the dolomitic marble as a light grey, very fine-grained,
massive rock and the greywacke as a dark grey, fine to very
fine-grained, thickly bedded rock with abundant
disseminated magnetite.
Mineralization: Meen (1944, p.41) writes:
"....The material on the dump of the west shaft
indicates a quartz vein in dolomite. The mineralization galena and chalcopyrite. The material on the-dump of
the east shaft shows quartz in greywacke and quartzite
with considerable amounts of pyrite.... Quartz stringers
containing boulangerite and jamesonite are visible in
the pits in lot 7."
Carter observed narrow (*Cl mm) conformable layers and
lenses of disseminated, fine-grained tetrahedrite,
chalcopyrite and pyrite in the marble. He also reported a
small percentage of sphalerite in quartz veins and minor
mineralization in cross-cutting fractures.
A polished thin section of the mineralized vein contains
up to 3% of finely disseminated jamesonite, sphalerite and
chalcopyrite with minor pyrite, arsenopyrite and
tetrahedrite. Jamesonite forms needle-like grains and
irregular crystal aggregates ^2mm) and is replaced in
places by chalcopyrite. Chalcopyrite occurs in small
irregular blebs commonly with sphalerite and jamesonite.
Sphalerite is found in small rounded grains and crystal
aggregates disseminated throughout the section. Pyrite and
arsenopyrite form subhedral grains ^0.3mm) in the gangue
and with chalcopyrite. Tetrahedrite occurs in a rounded
aggregate with chalcopyrite and gangue minerals. The
gangue is composed of massive, very fine- to medium-grained
quartz (SS'fc) carbonate ( 35%) and muscovite ( l*).
Sulphides occur with all gangue minerals.

Mineral List



14 entries listed. 12 valid minerals.

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References

Geological Survey of Canada Miscellaneous Report 41.

Malczak,J.et. al.(1985) Base Metal, Molybdenum and Precious Metal Deposits of the Madoc-Sharbot Lake Area. Southeastern Ontario. Ontario Geological Survey, Open File Report 5548

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