All of these minerals are found in our electronics and all are considered conflict minerals, due to their potential origin in the Democratic Republic of Congo.
In a smartphone, for example, tin is used to solder metal components together, while tantalum is used in capacitors, which store electrical energy.
Tungsten is used in the components that make a phone vibrate, and gold is used in circuit board connectors.
But consumers still can't be sure if the minerals in their electronics are fully conflict-free, or if the mines where they originated are dangerous, environmentally destructive, or use child labor.
So while companies like Apple, Microsoft, Intel and Tesla put out extensive reports on conflict minerals every year, usually stating that there is no reason to believe the minerals they source help to support armed groups, corruption and instability at mine sites means there are no guarantees.