Organisation for Economic Cooperation & Development (OECD)+OECD Minerals Guidance (Step 1.A.1)+methodology

Look for reference to the OECD Minerals Guidance in Annual or Sustainability Reports, Codes of Conduct, and other public documents. The company may include a mention to the full title of the Minerals Guidance or a shorter version. 

Keyword search for 'OECD' and the 'Organisation for Economic Co-operation and Development' to find references.

In order to receive a 'Yes', the guidance mentioned must be the Minerals Guidance (not for example the OECD guidance for Multinational Enterprises or Responsible Business Conduct).

If you do not find any mention of the Minerals Guidance, the answer is 'No'. As this question regards public reporting, 'Unknown' is not an answer option.