At average speed, one can do about 60 trips to the nature altar via the Abyss per hour, using the amulet of glory to teleport back to Edgeville, and using the tool belt items to mine through the rocks in the abyss. You need to recharge your pouches every 7 to 9 trips, to prevent the giant pouch from degrading. Assuming all pure essence is bought on the Grand Exchange for coins each, you can make coins per hour using this method. If you have completed Hero's welcome you are able to make 5% more runes, resulting in about 455 additional nature runes per hour.