mine

print("Mining started! Back after 40 blocks")
for i=1,40 do
if turtle.detect() then
   turtle.dig()
end
turtle.forward()
if turtle.detectUp() then
   turtle.digUp()
end
if turtle.detectDown() then
   turtle.digDown()
end
end
turtle.turnLeft()
turtle.turnLeft()
for i=1,300 do
if turtle.detect() then
   turtle.dig()
end
turtle.forward()
   if turtle.compareDown() then
   break
end
end
print("Now grab your stuff ^^")