The Ymir Pulaskite Quarry is located about 1.1 kilometres south of the town of Ymir, on the west side of the Burlington Northern railway tracks.

The abandoned dimension stone quarry produced monument and ornamental stone intermittently throughout the first half of the century. The stone, locally known as "Ymir Pearl" can be seen in Nelson where it was used in construction of the War Memorial. The Hercules Sandstone Company produced stone for the Hartford Building (1929), Seattle; the Bank of California (1929), Tacoma; and the Security Building (1927), Olympia.

The area is underlain by biotite monzonite of the Middle Eocene Coryell Intrusion.

The rock is described as "pulaskite" which was quarried from the core of a basic syenite plug. On fresh surfaces the pulaskite is mauve-grey with phenocrysts of green to black diopside and black blades of biotite which darken the tone of the rock. The matrix consists of intergrowths of orthoclase and albite. The elongate feldspars are oriented between 330 to 360 degrees and schillerize a brilliant sky blue when wet. Infrequent blades of biotite and a red-brown iron stain, derived from weathered blades of biotite are visible in places. Weathered surfaces have a dull appearance as does the polished face of the Nelson War Memorial.

The development of the joints in the quarry is irregular and difficult to predict. One main set strikes east and has a near-vertical dip. This set is recognized both in the quarry and in outcrop to the south. A flat set strikes north and dips 30 degrees west but the joints are irregular and not well defined.

Results of physical tests carried out on samples from the quarry indicate the stone does not meet the American Society for Testing and Materials (ASTM) standards for granite building stone, but does meet all other ASTM standards.