After one year of study, he devised a detailed plan to build two superimposed tunnels, each 600 metres (2,000 ft) long, that were linked by nine huge vertical reservoirs for the processed ore. In the upper tunnel an electric train was used to bring the load the reservoirs: the ore was unloaded by gravity into hatches on top of the reservoirs. In the lower tunnel a conveyor belt received the ore from the reservoirs and brought it to an extensible 16-metre (52 ft) long conveyor belt capable of fully loading a steamship moored at the base of the cliff in about two days.