### Question
How is the "secondary recovery" defined?


### Answer
The term **secondary recovery** is defined in *42 U.S.C. § 18743* as follows -

> the recovery of critical minerals and metals from discarded end-use products or from waste products produced during the metal refining and manufacturing process, including from mine waste piles, acid mine drainage sludge, or byproducts produced through legacy mining and metallurgy activities

#### Citation:
  - *42 U.S.C. § 18743*
  - Heading: **CHAPTER 162-ENERGY INFRASTRUCTURE > SUBCHAPTER II-SUPPLY CHAINS FOR CLEAN ENERGY TECHNOLOGIES**

