The Blubber Bay quarries are located on Lot 13 along the southwest shore of Blubber Bay at the north end of Texada Island. Several different companies have owned Blubber Bay Quarry since 1907, starting with Pacific Lime Company. The quarry was subsequently purchased by Gypsum Lime and Albastine (1955), Domtar (1962), and Oregon Portland Cement (1983). Ash Grove Cement is the current owner and has been since 1985.

The quarry has been in operation continuously since 1907. The deposit is situated on the western flank of a broad northwesterly plunging syncline within a 13 kilometre long belt of Upper Triassic Vancouver Group, Quatsino Formation limestone up to 3 kilometres wide along its axis. Locally, the principal structure consists of a broad dome centred on the southwest corner of the Number 2 quarry. Dips range from less than 10 degrees near the centre of the dome to 40 degrees in the Number 3 quarry, 150 metres to the northwest. The dome is complicated by a few steeply dipping faults with displacements of up to 3 metres. The quarries are developed in the upper portion of the high calcium lower member and in the lower portion of the more magnesian middle member of the Quatsino limestone. The limestone is intruded by a few steeply dipping, dominantly west trending diorite and greenstone dykes a few centimetres to 6 metres wide.

The limestone is generally fine grained and black to dark bluish grey in colour. In places, irregular vein-like masses of white limestone occur in the dark limestone, likely due to the bleaching effect of solutions migrating along fractures. Dolomite and quartz occur as fine disseminations and as veinlets in the middle member. Two chip samples taken in succession across the top 12.1 metres of the lower high calcium member exposed in the southeastern portion of the Number 2 quarry averaged 55.34 per cent CaO, 0.46 per cent MgO, 0.20 per cent insolubles, 0.01 per cent R2O3, 0.04 per cent Fe2O3, 0.010 per cent MnO, 0.017 per cent P2O5, 0.02 per cent sulphur and 43.89 per cent ignition loss (Bulletin 40, page 65).

The limestone is being selectively mined for chemical and cement grade product.

Gilles Bay (Holnam West) (092F 395) and Blubber Bay (Ashgrove Cement) ship about 5 million tonnes annually. About 1 million tonnes of waste rock is sold from Texada Island as construction aggregrate.