function discharge() --throws all stuff under turtle
 for slot = 1, 9 do
  turtle.select(slot)
  turtle.drop()
 end
end

function isempty()
 local empty = true
 for slot = 1, 9 do
  empty = empty and (turtle.select(turtle.getItemCount(slot)))
 end
end

function deposit()
 turtle.turnLeft()
 turtle.turnLeft()
 turtle.forward()
 discharge()
 redblink()
 turtle.turnLeft()
 turtle.turnLeft()
 turtle.forward()
end

shell.run("excavate", "3")
repeat
 deposit()
 shell.run("excavate", "3")
until isempty()