while true do
  turtle.select(1)
  if turtle.getItemCount(16) > 0 then
    turtle.turnLeft()
    turtle.turnLeft()
    while not turtle.detect() do
      sleep(2)
      print("No chest found waiting for chest...")
    end
    if turtle.detect() then
      for i = 1,16 do
        turtle.select(i)
        turtle.drop(64)
      end
      turtle.turnLeft()
      turtle.turnLeft()
    end
  end
  turtle.dig()
end