Cobble

while turtle.detect() do
  turtle.turnLeft()
end
turtle.turnLeft
turtle.turnLeft
blocksMined = 0
while true do
  for n=1,64 do
  while not turtle.detect() do end
    turtle.dig()
  end
  blocksMined = blocksMined + 64
  print(blocksMined.."blocks mined")
  turtle.turnRight()
  turtle.drop()
  turtle.turnLeft()
end