MINING METHOD OF WATER-BEARING SAND-GRAVEL DEPOSITS Russian patent published in 2002 - IPC

FIELD: mining of nonmetalliferous building materials; applicable in mining of sand-gravel deposits. SUBSTANCE: method includes working of above-water bench by hydraulic giant installed in nose part of floating control plant. Washed-out mixture of sand and gravel is directed under gravity to floor of underwater bench. It worked out by hole hydraulic giant unit together with sand-gravel above-water bench. Hole hydraulic giant unit is located in middle part of floating control plant. For passage of pontoon of floating control plant, upper part of underwater bench is washed out for depth of its draught by hydraulic giant installed in nose part of floating control plant with bypassing of washed-out mixture to floor of underwater bench. EFFECT: higher efficiency of mining operation, increased height of underwater bench. 3 cl