shaftmine2

-- shaftmine2 revised version of shaftmine
-- Define functions
function Mine20()
  for i = 1,20 do
    if turtle.detect() then
      turtle.dig()
    else os.sleep(1)
    end
  end
  turtle.forward()
end

-- Mining the lower row
Mine20()

-- Move up and turn around
turtle.digUp()
turtle.up()
turtle.turnLeft()
turtle.turnLeft()

-- Mining the upper row
Mine20()
turtle.forward()