Leases for quarrying and mineral rights around the coast of Mynydd Tir y Cwmwd, between Sir Love and a number of individuals and companies, began in the late 1870's. Quarrying continued until the late 1950's, when the last working quarry is thought to have closed.

Quarry workings are shown extending for some 450m along the edge of the hill on an historic chart, with a quay (NPRN 518586) at the east end.

Sources include:
Davidson, A. & Flook, H. , 1995 , Cambrian Quarry, Llanbedrog: Archaeological Assessment
Historic Admiralty Chart 1505_A8 RCAHMW digital collections sourced from the UK Hydrographic Office and first published in 1843

Maritime Officer, RCAHMW, March 2012.