What is the relationship between Teck Resources and coal in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

Our analysts have initiated coverage on the coal industry with focus on the following companies: Vale S.A. ( VALE ), Peabody Energy Corporation ( BTU ), Teck Resources Limited ( TCK ), Arch Coal Inc. ( ACI ), and Rio Tinto PLC ( RIO ).

Answer: product_or_material_produced