You can buy a steel pick axe in the Grand Exchange (G.E.) in Varrock, or buy it at the pickaxe shop in the Dwarven Mine in Falador, but this is far off from the main pathways of most players and can be hard to reach in some cases. The prices at the Grand Exchange are also the best out of all.
With a high enough smithing level, you can also smith your own steel pickaxe. (only if you are a member)
Rune Pickaxe - 18,145gp - 20,055gp
Grand Exchange
A volatile pickaxe is a kind of pickaxe in runescape.
You can buy a Mithril Pickaxe from Nurmof's Pickaxe Shop in the Dwarven Mine, but beware of the much more expensive price offered by the shop. You can also buy it off of the Grand Exchange for the best price in RuneScape shops. It's also possible to obtain a Mithril Pickaxe from monster drops from Living Rock Protectors, Dagannoth Rex, and Living Rock Strikers.
no such thing as silver pickaxe there is only steel which looks silver
On RuneScape? A pickaxe, iron ore, and a furnace.
You can't mine for fish, you fish for fish, and you mine for ores. You mine with a pickaxe you find an ore then mine it, and you fish for fish with fishing equipment.
Go to a hardware store and buy one.
To mine coal in RuneScape you need a pickaxe and the required level to mine it. Then all you have to do is equip or carry the pickaxe and click on the rock containing coal. If you do not know what a rock contains then right-click the rock and select to 'prospect' option. You will then be informed as to what is in the rock.
No store in Runescape does such.
It is hard to give exact numbers - the increase in speed probably depends on the mineral you mine, and on your mining level. In any case, it is best to use the most advanced pickaxe you can - unless you have trouble affording it.
You can find it in caves and you must dig it with pickaxe (not wooden or stone pickaxe)