Cobble

while true do
  turtle.select(1)
  while turtle.getItemCount(16)<1 do
    turtle.digUp()
    turtle.digDown()
    turtle.drop()
  end
  turtle.select(16)
  while not turtle.drop() do sleep(5) end
  for i = 1,16 do
    turtle.select(i)
    turtle.drop()
  end
end