Just as the total population of illegal immigrants in the U.S. has declined since 2007, the proportion of illegal immigrants in the workforce has also declined; in 2012, illegal immigrants made up 5.1% of the U.S.'s civilian labor force.
Iron Ore is a common ore found almost everywhere in a Minecraft World. Iron ore generates around and below sea-level in the Overworld. It is a crucial material to gather during the early stages of the game, since it can be made into an iron pickaxe capable of mining all types of ores (including diamond). Every Iron Ore block contains enough iron to make one Iron Ingot, when it is smelted.
Mining is done by activating an ore vein with a pickaxe in your inventory, or attacking an ore vein with an equipped pickaxe. In addition to standard pickaxes, Rocksplinter or the Notched Pickaxe can be used to mine ore. Ore veins are everywhere: all ore types can be mined from veins and then smelted at a forge to obtain ingots. Veins typically yield three pieces of ore. Each piece of ore has a 10% chance of being accompanied by a random, level-dependent gem, as detailed on the Gems page.