Iron Pickaxe of Inferno

EventHandler.java

	@SubscribeEvent
	public static void onBlockLeftClicked(PlayerInteractEvent.LeftClickBlock event) 
	{
		/*
		 * Tips: Don't worry about World#getBlockState returning null,
		 * if it does not find anything valid it will just return the default state of AIR.
		 */

		Random rand = new Random();

		ItemStack heldStack = event.getEntityPlayer().getHeldItem(EnumHand.MAIN_HAND);
		Block block = event.getWorld().getBlockState(event.getPos()).getBlock();
        Item heldItem = heldStack != null ? heldStack.getItem() : null;
		
		if (!event.getWorld().isRemote && block == Blocks.STONE && heldItem == Items.IRON_PICKAXE && rand.nextInt(1) == 0) 
		{
			BlockPos firePos = event.getPos().offset(EnumFacing.UP);  // offset this BlockPos 1 block UP
			final boolean shouldSetOnFire = rand.nextInt(9) == 0;
			
			if (shouldSetOnFire && (event.getFace() == EnumFacing.UP || event.getWorld().isAirBlock(firePos)))
			{
				/*
				 *  Use setCanceled as setting event result does nothing in this case.
				 */
				event.setCanceled(true);
				event.getWorld().setBlockState(firePos, Blocks.FIRE.getDefaultState());
			}
		}
	}