You have to be a member and have started the quest where you find the goblin tribe. On the other side is a maze in which to get to this tribe where you can mine silver&iron. After another quest in the series you can access the underground city.
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The lumbridge castle cellar is located directly below the lumbridge castle kitchen. you can get there by entering the trapdoor that is very visible on the kitchen tile. The cellar is a very insignifigant room that has cabbage, rats and spiders. for more info and help, my runescape username is ameliame
you can get a free knife under lumbridge castle in the cellar were you start the quest cooks assistant.
You need to complete the first part at least on the quest "Recipe for Disaster".
East pub in Keldagrim and in the cellar of the Port Phasmatys.
Varrocks East bank, somewhere very close to there is a fountain. I just go from ge to fountain near castle Update by Keesjo219 : I always use falador little bank then te little water pump, that's fastest READ THIS ONE FIRST: CLOSEST AND UPDATED Update by Kentis99, 20th August 2009: One very little known about water source which is actually the CLOSEST most CONVENIENT and FASTEST place to bank/watersource is Neitiznot. The water geyser combined with the one-click bank chests really is the best place to be. The Lumbridge cellar chest bank in like 7 steps away from the sink and its 1 click 53worrn