Electrical conductor

Conductivity is a narrow field at the top and the ranking barely moves: silver, copper, gold and aluminium, in that order, and nothing else is close among the metals. So the choice between them is almost never about conductivity — it is about price, weight, corrosion and what can be joined to what.

Aluminium against copper is the case worth understanding. Aluminium conducts about 60 per cent as well per unit volume and about twice as well per unit mass, which is why overhead transmission lines are aluminium and household wiring is copper: one is limited by what a pylon can hold up, the other by what will fit in a wall.

Material
Battery graphite
and it must be, because the anode has to carry current as well as host lithium — which is most of why nothing has replaced carbon here
Element
Copper
the benchmark against which other conductors are rated
Alloy
Electrical steel
and it is deliberately a poor one — the silicon is added to raise resistivity, because current in the core is pure loss
Element
Gold
in contacts and bonding wire, where non-tarnishing matters more than conductivity
Mineral
Graphite
within the sheet plane; a poor conductor perpendicular to it
Element
Indium
as indium tin oxide, where transparency matters more than conductivity
Material
Indium tin oxide
and transparent at the same time, which almost nothing else manages
Element
Lithium
as the charge carrier in lithium-ion cells, not as a wiring metal
Alloy
Nichrome
deliberately a poor one — the resistance is the point, and it is roughly sixty times copper's
Element
Silver
the best of any element, and priced out of most applications
Alloy
Solder
not a good one — solder's conductivity is far below copper's, and a joint is designed to be short for that reason

Each of these uses is established and cited on its own. Whether something counts as an ore, for instance, depends on grade, price and era — and those qualifications are shown alongside it.