Nb, Ta Pegmatite, Lunenburg County
The Keddy Pegmatite, also referred to as the Lantz Pegmatite,
is found southwest of the village of New Ross, Lunenburg County
on the west side of the Larder River. The Larder River flows
from Lake Ramsey to the Gold River and crosses under the New
Ross to Forties Road about 3.8 km west of New Ross. The pegmatite
is found about 2.4 km south of the Forties Road. The Keddy Pegmatite
is accessible by three routes: (1) originally the site was accessed
via a woods road leading south from Keddy Hill at Forties (O'Reilly
et al., 1982), but more recent logging and Christmas tree farming
in the area has resulted in easier access; (2) Perhaps the best
way to access the prospect is via a Christmas tree farm found
on the north side of the Meister Road, which leads west from
Lake Darling at New Ross. This farm passes to within a couple
of hundred metres of the east bank of the Larder River immediately
opposite the prospect. Permission to pass through the Christmas
tree farm must first be obtained. One must also cross the Larder
River but this is easily done at most times of the year except
for the spring when water level is at it's highest; (3) a recent
(circa. 1992) high quality (i.e. passable by car) logging road
leads from the Forties Road at Forties and passes along the
top of the hill found a few hundred metres west of the prosect.
Taking this route means that on parking their vehicle, one must
only walk through the woods and down the slope to the prospect.
However, the logging road is usually gated and permission must
be obtained for entrance.
A few flakes of molybdenite were observed in dump samples
of the greisenized leucomonzogranite by O'Reilly et al. (1982).
Other minerals identified in the greisen and pegmatite include:
topaz, dumortierite, dickite, fluorite, columbite or tantalite,
scheelite and wolframite. Molybdenite, in 2.5 cm rosettes, occurs
in an aplitic leucogranite in the central portion of the prospect.
Cameron (1950) indicates the quartz pegmatite dyke at the the
south end of the prospect contains flakes of molybdenite and
a radioactive mineral but these were not observed by O'Reilly
et al. (1982).
The prospect was discovered in 1890 at which time two test pits
were dug. Faribault (1924) indicates two pegmatite dykes at
this site on his geology map and reports that molybdenite occurs