miningHeight=80

function refuel()
	turtle.select(2)
	local flag = turtle.refuel(1)
	turtle.select(1)
	return flag
end

function repeatAction(funct)
	while not funct() do
		if(turtle.getFuelLevel() < 5) then
			refuel()
		end
		os.sleep(1)
	end
	return true
end

os.sleep(1)
repeatAction(refuel)
turtle.select(1)
if(turtle.getItemCount(1) == 0) then
	turtle.select(1)
	repeatAction(turtle.digUp)
end

while true do
	turtle.select(1)

	if(turtle.getFuelLevel() < 5) then
		refuel()
	end

	while true do
		if not turtle.detectDown() then
			while not turtle.down() do
				turtle.digDown()
				if(turtle.getFuelLevel() < 5) then
					refuel()
				end
			end
		elseif turtle.digDown() then
			while not turtle.down() do
				turtle.digDown()
				if(turtle.getFuelLevel() < 5) then
					refuel()
				end
			end

			repeatAction(turtle.placeUp)
			for i=3, 16 do
				turtle.select(i)
				turtle.dropUp()
			end
			turtle.select(1)
			turtle.digUp()
		else
			break
		end
	end

	for i=0, miningHeight do
		while not turtle.up() do
			turtle.digUp()
			if(turtle.getFuelLevel() < 5) then
				refuel()
			end
		end
	end

	while not turtle.forward() do
		turtle.dig()
		if(turtle.getFuelLevel() < 5) then
			refuel()
		end
	end
end