The fullest published accounts of the mine's history are given in G.W.Hall 'Metal Mines of Southern Wales', 2nd ed, Kington, 1993, pp.51-59, and in S.J.Hughes 'Nant y Mwyn Mine, Llandovery, Dyfed', British Mining vol.45, Memoirs of the Northern Mines Research Society, 1992, pp.87-110.
On p.99 Hughes states that 'Following the abandonment in 1900, all production ceased until 1915 despite a lease having been issued to a Mr.O.Davies. According to an old inhabitant, Octavius Davies, proprietor of the Rhandirmwyn Stores tinkered about the mine about this time. Some underground trials took place in 1907-08 and again in 1911 with up to seven men being employed during this period.' The next working he discusses is the reopening in 1914 by Joseph Argall.
Hall gives a briefer but similar account of this period.
Lodes at metal mines were often named after prominent miners or mine captains. A quick read of Hall and of Hughes seems to suggest that the name 'Roderick's Lode' is only encountered as an alternative to 'Old Lode' on twentieth century plans of the mine.