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Chisholm mine, Sheffield Township, Lennox and Addington Co., Ontario, Canada

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Latitude & Longitude (WGS84): 44° 32' 11'' North , 76° 52' 48'' West
Latitude & Longitude (decimal): 44.5363888889, -76.88
 
History:
1904: S.W. Chisholm excavated a pit 50 feet in diameter and 10 feet deep. 600 tons of rock were mined and 85 tons of picked ore (1.75% MoS2) was sold in the United States for $1,275.
1915: second pit was opened beside the original working and widened to 80 feet in diameter and 10 to 15 feet deep. Mr. Chisholm shipped 18 tons of material to Ottawa for analysis; the average grade was 1.4% MoS2.
1916: International Molybdenum Company of Renfrew optioned the property and sent 235 tons of material (selected from existing stockpiles) to their concentrator in Renfrew.
1917: Messrs. Chisholm and Seybold erected a small cobbing plant with a capacity of 25 tons/10 hours. 5 tons of crude concentrate shipped to the Mines Branch assayed 5.8% molybdenite. 80 tons of pyrite were sold to the Grasselli Chemical Company. 40 ton concentrator was erected, an unknown quantity of tailings from the cobbing plant was treated.
1919: Property owned by Sheffield Molybdenite Mining Co. Ltd. No mining activity reported.
1937: W.J. Brown of Montreal held the property. No mining activity was reported (OFR 5548, p.178).

According to: Malczak,J.et. al.(1985) Ontario Geological Survey, Open File Report 5548, p175-179
The geology is as follows:
The mineralized zone at the Chisholm Mine
lies at the southern end of a narrow, sinuous marble band
within the Sheffield granite gneiss.
There are three major rock types at the
mine site: marble, granite gneiss and scapolite skarn. The marble consists of white, coarse-grained calcite with a minor component of graphite, muscovite and diopside.
Granite gneiss surrounds and in part underlies the marble.
It consists of a pink, fine-grained foliated rock
containing microcline, plagioclase, quartz and accessory
magnetite and biotite. The molybdenite-bearing scapolite skarn outcrops in the northwest corner of the pit only; it is a very
coarse-grained, massive inhomogeneous rock composed of
scapolite and diopside with minor sphene, phlogopite and
apatite and in places calcite, tremolite and chlorite.
Pyrrhotite, pyrite and minor molybdenite occur locally
within the skarn where they may comprise 20 to 60
percent of the rock.
The ore body is more or less broken up by
horses of crystalline limestone. The southwest side of
the pit, however, is almost solid sulphides over a width
of 30 feet. On the northeast side of the pit and on the
hanging wall side, the sulphides and pyroxenite occur in
pockets through the limestone.
The molybdenite occurs associated with pyrrhotite,,
pyrite and pyroxenite. The crystal flakes of
molybdenite average 1/4" to l" in diameter, although
much larger flakes are obtained".

Mineral List



13 entries listed. 9 valid minerals.

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References

J. A. Mandarino and R. I. Gait (1970) Molybdenite polytypes in the Royal Ontario Museum. The Canadian Mineralogist 10:723-729
MDI Number: MDI31C10SW00014

Malczak,J.et. al.(1985) Ontario Geological Survey, Open File Report 5548, p175-179

 
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