The Parsons Bridge deposit is located 300 metres southwest of Parsons Bridge on the east side of Highway 1A at the head of Esquimalt Harbour.

A steeply dipping limestone lens, 30 metres wide, strikes 360 to 030 degrees for 60 metres in the Mesozoic and/or Paleozoic Wark Gneiss. The Wark Gneiss is thought to be the metamorphic equivalent of a mafic unit of either the Paleozoic Sicker Group or the Upper Triassic Karmutsen Formation (Vancouver Group), the latest metamorphism having taken place in the Jurassic. The lens is bounded to the east and southeast by a granitic intrusive and is intruded by greenstone dykes.

The limestone is fine grained, bluish grey and high calcium in composition. Two 18.3 metre long chip samples taken in succession across the quarry face and the adjacent slope averaged 53.45 per cent CaO, 1.07 per cent MgO, 2.25 per cent insolubles, 0.415 per cent R2O3, 0.325 per cent Fe2O3, 0.015 per cent MnO, 0.012 per cent P2O5, 0.0695 per cent sulphur and 42.4 per cent ignition loss (Bulletin 40, page 91).

Limestone was initially quarried here in 1912 and continued from 1917 to 1922 and 1938 to 1941. Between 1917 and 1941, 7,694 tonnes of limestone were quarried.

In 1907 and 1908, the Silica Brick and Lime Co. produced over 4 million lime-silica bricks from this area.