local function detectOreDown()
	turle.select(2);
	local d = turtle.compareDown();
	turtle.turnLeft();
	local l = turtle.compare();
	turtle.turnRight();
	turtle.turnRight();
	local r = turtle.compare();
	turtle.turnLeft();
	if (d or l or r) then
		turtle.select(3);
		turtle.turnLeft();
		turtle.turnLeft();
		turtle.place();
		turtle.turnRight();
		turtle.turnRight();
	end
end

local function detectOreUp()
	turle.select(2);
	local u = turtle.compareUp();
	turtle.turnLeft();
	local l = turtle.compare();
	turtle.turnRight();
	turtle.turnRight();
	local r = turtle.compare();
	turtle.turnLeft();
	if (u or l or r) then
		turtle.select(3);
		turtle.turnLeft();
		turtle.turnLeft();
		turtle.place();
		turtle.turnRight();
		turtle.turnRight();
	end
end

turtle.select(1);
turtle.refuel(1);

for i=0,4 do

turtle.dig();
while turtle.detect() do
	sleep(0.8);
	turtle.dig();
end
turtle.forward();
detectOreDown();

turtle.digUp();
while turtle.detectUp() do
	sleep(0.8);
	turtle.digUp();
end
turtle.up();
detectOreUp();

if i % 4 == 0 then
	turtle.select(16);
	turtle.placeUp();
end

turtle.dig();
while turtle.detect() do
	sleep(0.8);
	turtle.dig();
end
turtle.forward();
detectOreUp();

turtle.digDown();
turtle.down();
detectOreDown();

if turtle.getFuelLevel() < 20 then
	turtle.select(1);
	turtle.refuel(1);
end

end