Dynamite is used in the Blast Mining minigame on the northern side of the Lovakengj House in Great Kourend.
In order to create dynamite, players must use volcanic sulphur, juniper charcoal, saltpetre, and a pot to create a dynamite pot, then adding a ball of wool to complete the product. This is a very long process, but is recommended for those unwilling to use other methods to procure them.
Players can purchase dynamite from Thirus to the south-east of the entrance to the blast mine for 1177 coins each – while expensive, it does save the time of making them. Players can also obtain dynamite as a reward from subduing the Wintertodt and completing the Chambers of Xeric.