| 摘要 |
FIELD: mining. ^ SUBSTANCE: invention refers to mineral resource industry, particularly to development of coastal sea placers of minerals including alluvial placers of valuable minerals and noble metals including gold, silver, platinum etc. The procedure for development of placers consists in construction of a vertical borehole. Required number of down holes is drilled next to the vertical borehole through production sediments and a raft. Production placer sediments are washed out from down holes and are converted into pulp; pulp is directed to the vertical borehole and inclusions are extracted to surface. The vertical borehole is equipped with a through filter column. By means of drills-expanders there are formed pits under the down holes through the raft in a zone of stable rock. Inclusions in form of rubbles are destructed in pits; breaks of rubbles together with pebbles, fragments of host rock and nuggets are extracted to surface via grab columns. ^ EFFECT: facilitation of maximal opening of production place, increased extraction of mineral. ^ 3 cl, 1 dwg |
