This list contains the smelters and refiners identified in Apple's supply chain as of December 31, 2021 for certain minerals.
![Interconnections and Independence: Heinrich Wieland (1877–1957) and His Era - Vaupel - 2007 - Angewandte Chemie International Edition - Wiley Online Library Interconnections and Independence: Heinrich Wieland (1877–1957) and His Era - Vaupel - 2007 - Angewandte Chemie International Edition - Wiley Online Library](https://onlinelibrary.wiley.com/cms/asset/5138f111-a8ca-4108-93f2-c692f194d2cb/mfig003.jpg)
Interconnections and Independence: Heinrich Wieland (1877–1957) and His Era - Vaupel - 2007 - Angewandte Chemie International Edition - Wiley Online Library
![Interconnections and Independence: Heinrich Wieland (1877–1957) and His Era - Vaupel - 2007 - Angewandte Chemie International Edition - Wiley Online Library Interconnections and Independence: Heinrich Wieland (1877–1957) and His Era - Vaupel - 2007 - Angewandte Chemie International Edition - Wiley Online Library](https://onlinelibrary.wiley.com/cms/asset/0424b27b-f018-4999-9ee7-bdec64863aed/mcontent.jpg)