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 in both.