Limestone was quarried 2.5 kilometres south of Blubber Bay in the centre of Lot 305, on the north end of Texada Island.

The quarries are situated on the west flank of a northwest plunging syncline that is preserved along a 13 kilometre long belt of Upper Triassic Vancouver Group, Quatsino Formation limestone up to 3 kilometres wide along its axis. The quarries are developed in the lower member of the Quatsino Formation, consisting of a hundred metres of high calcium limestone. Four steeply dipping dykes, 3 to 6 metres wide, are exposed for approximately 100 metres each in the number 4 quarry (south quarry). One of these strikes west, while the rest trend north. A few faults and zones of shattering and shearing are present.

The limestone is generally a uniform fine-grained, massive, black rock. Two 4.6 to 6 metre wide, nearly vertical zones of interbanded black and white limestone are exposed in the walls of the number 4 quarry. Two chip samples taken in succession along a face near the north end of the number 4 quarry in 1956, across a total length of 54 metres, averaged 55.17 per cent CaO, 0.02 per cent MgO, 0.65 per cent insolubles, 0.06 per cent R2O3, 0.06 per cent Fe2O3, 0.004 per cent MnO, 0.011 per cent P2O5, 0.03 per cent sulphur and 43.62 per cent ignition loss (Bulletin 40, page 65 - Samples 5 and 6).

Limestone has been produced from two adjoining quarries, the number 4 and 5 quarries, between 1948 and 1966 by Pacific Lime Ltd. and Domtar Ltd. Total production amounted to 5.5 million tonnes.