​ ​ ​ ​ ​ Item 4. ​ Controls and procedures ​ 65 ​ ​ ​ ​ ​ ​ ​ Report of Independent Registered Public Accounting Firm ​ 66 ​ ​ ​ ​ ​ Part II. Other Information: ​ ​ ​ ​ ​ ​ ​ Item 1. ​ Legal Proceedings ​ 67 ​ ​ ​ ​ ​ Item 1A. ​ Risk Factors ​ 67 ​ ​ ​ ​ ​ Item 2. ​ Unregistered Sale of Equity Securities and Use of Proceeds ​ 67 ​ ​ ​ ​ ​ Item 4. ​ Mine Safety Disclosures ​ 67 ​ ​ ​ ​ ​