The tor was the hub of the four Dartmoor
stannary areas –
Ashburton,
Chagford,
Tavistock and
Plympton – whose boundaries radiate outwards from it. The Stannary Court was convoked here when deemed necessary, at irregular intervals, by the Lord Warden who summoned 24 representatives or "jurates" from each of the four stannaries. Each meeting probably continued for several days and dealt with matters such as setting stannary law, registering tinworks and mills, hearing petitions and imposing penalties on those guilty of breaking the stannary laws. There is evidence for ten assemblies at Crockern Tor: in 1494, 1510, 1532, 1533, 1552, 1567, 1574, 1600, 1688 and 1703. The earliest documented meeting on 1 September 1494 had Sir John Stepcote, vice-warden of the Devon Stannaries, as chairman. Sir
Walter Raleigh was
Lord Warden of the Stannaries for many years, and it is recorded that he presided at one Court at Crockern Tor, on 27 October 1600. The last meeting for which records survive was on 23 September 1703 where the Warden, John Granville, 1st Baron Granville and the Vice-Warden, the Honourable Samuel Rolle, opened the court at 8 a.m. The last court was said to have been held in or around 1745, but no documentation exists, and considering that the tin industry on Dartmoor had by then declined greatly, it could have been only a small affair. Patchy and conflicting evidence indicates that compared to the bare nature of the site today, there were chairs, seats, a table and a shelter, all made of granite, which were used when the court met. These items were supposedly taken away or broken up in the late 18th century, possibly used as a source of stone for the buildings that started to appear on the moor after the roads were improved. On the other hand, Douglas St Leger-Gordon, the noted writer on Devon history, casts doubt on the existence of any substantial meetings at this "singularly unsuitable" place in his 1963 book,
Portrait of Devon. He points out that any proceedings must have been frequently disrupted by the wind carrying away someone's hat, or "scattering the minutes of the last meeting insecurely held in the warden's numbed fingers". He notes that later records of the Parliament mention adjournments to Tavistock and suggests that a nearby "Tinners' Hall" - now lost - may have been where they actually conducted their business.{{cite book ==Folklore==