Besides it would be more areas to walk around and find adventure. To start I would suggest a fresh pair of hills with a city on the top coated with snow ( I believe it would be cool since there arent any of these ). To introduce this new town jagex could make a pursuit where adventurers heading to the hills suddenly disapared and probably it was some monster.
To switch pickaxe handles, go to Nurmorf in the Dwarven Mines or Bob in his axe store or whatever and ask him to switch pickaxe handles. A very long pickaxe handle can enable you to mine from an extended distance. The maximum pickaxe handle will be approximately three squares long. Different contours of a pickaxe handle may relaxation you grip when you mine, which means that you can extract an ore faster than usual.
Colours of a pickaxe handle could be specialized in a particular sort of ore. By way of instance, a blue collar pickaxe handle is specialize in mithril ore. When you collect it, there is a chance that it could be a"pure mithril ore" just like the woodcutter's"pyre willow logs" or whatever. When it's pure, it might be worth over a usual ore. When you smelt it, then you might find an excess bar with using exactly the exact same amount of coal. All these pickaxe handles would only be found in the Mining mini-game's reward shop. If these are popular, then they might market these pickaxe handles at public stores or shops.