Take a trip back to the mine and cut the blocks into small pieces as you're through the mine. After you have your full inventory take a trip back to Dark Altar and RuneScape gold bless stones that you have again. You can now go into the Blood Altar to make your runes. Once you have chiseled the rest of the blocks in your inventory and you can make even more Blood Runes. Repeat this process for whatever time you'd like to.
The same procedure applies similar to Blood Runes and the only difference is that you bless your runes in the Soul Altar to the east instead of westward flow to the west and that you require a Runecrafting at a level of 90. They aren't as lucrative as Blood Runes but give much more experience making them best xp farm in bracket of levels 91 to 99.
At level 27, players are able to begin making Cosmic Runes. It is a wonderful method of earning money for players who want to focus on gaining gold while gaining some RuneCrafting experience at the same time. While it may yield decent gold in the beginning, it'll start to shine at level 59 and you will be able to get double Cosmic Runes in crafting.
As mentioned before experience rates are extremely low at 10-20k per hour, but the gold can be extracted from these runes is definitely worth it. It is possible to osrs fire cape service create 2500 runes a hour at 59 RuneCrafting that should yield approximately 450k gold.