Here's a breakdown:

* Tailings are the leftover materials after the valuable minerals have been extracted from the ore.

* They are typically a mixture of crushed rock, water, and other chemicals used in the extraction process.

* Tailings can contain harmful substances like heavy metals, arsenic, and cyanide, which can pose environmental risks if not properly managed.

There are other terms related to metal extraction waste, but tailings is the most common and comprehensive:

* Gangue refers specifically to the worthless rock surrounding the ore minerals.

* Slag is a by-product of smelting, which is the process of melting ore to extract the metal.

It's important to note that the specific composition of tailings varies depending on the type of ore and the extraction method used.