Dean Quarry is a disused quarry located close to Coverack, near St Keverne in Cornwall.

Gabbro, a hard dark, coarse igneous rock, equivalent to basalt was quarried at Dean Quarry. It has been quarried since the 1890's. At times, the quarry has produced over 200,000 tones a year. The rock was used for coastal defences and asphalt for roads.

Two quarry voids, separated by the mail haul roads provided the stone, which was then crushed. Conveyer belts took half of the crushed rock to the jetty, then loaded into waiting ships at high tide. The other half was taken by road. The quarry closed in 2005/6 with the loss of many jobs. The remaining plant equipment was scrapped by the council and the proceeds were shared out to the jobless workforce.

It is estimated that over 6.3 million tonnes of gabbro remain and plans have been drawn to reopen the quarry. The area has become a wildlife haven, not just in the quarry itself with it's lakes and marshes but the surrounding bay is also home to a vast amount of marine life which would all have a devastating affect if these plans go ahead.