 11 dwts., (about 46.5 kilos), £4,600 pounds sterling worth of gold dust had been landed at Falmouth, Cornwall from Brazil on the HM "Seagull" Packet and was then being sent on to London.Together with his London-born father, Ellis (Elias Levy) Caspar (1784–1862) he carefully planned a robbery.Its failure resulted in the transportation of the Caspars and their associates.