TRANSPORTLESS DEVELOPMENT SYSTEM (a. Transportless mining system, direct overcasting system-n. Transport-loses Abbauverfahren, transportloses System-f. Systeme d`exploitation sans transport- and. Explotacion sin transporte) – a method of conducting opencast mining in which overburden moved to the internal dump by excavators. It is used, as a rule, in the development of horizontal and gently sloping (up to 12 °) reservoir (usually 30 m thick) mineral deposits. The introduction of a transportless development system in the USSR began in 1942-45 (N.V. Melnikov, A.S. Chernegov, M. M. Sokolovsky, A. M. Sharkov, etc.).
There are two varieties of a non-transport development system: classical (main), in which overburden and mining operations are technologically, technically and organizationally isolated, and an “excavator-quarry”, where they are combined. In the classic vehicleless development system, stripping schemes are divided into simple and complicated. Simple schemes – without transshipment of overburden (without a secondary dump) are used in areas and deposits with an empty rock capacity of not more than 15-30 m, complicated – with one or more transshipments of a part or the entire volume of the primary dump (with a secondary dump) with an empty rock capacity no more than 30-40 m. With a higher capacity for the non-transport development system, only the lower (main) ledge is worked out, and the upper (advanced) ones are used using transport, transport-dump or special development systems. In complicated schemes due to the transfer of overburden to a secondary dump, a strip of worked space is freed up on the entire front of operations, onto which a primary dump is dumped from a subsequent overburden.