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Appendix A <br />Yorktown Energy Partners IX LP FEIN 27-3125579 <br />410 Park Avenue, 19th Floor Phone 212-515-2100 <br />New York, NY 10022 <br />Member Shareholder <br />Officers and Directors <br />BEGIN END <br />OFFICER TITLE DATE DATE <br />AFFILIATION <br />Yorktown IX Company LP <br />General Partner (1.5%) <br />10/5/2010 <br />Bryan H Lawrence <br />Limited Partner <br />10/5/2010 <br />Bryan H Lawrence <br />Manager <br />10/5/2010 <br />W Howard Keenan Jr <br />Limited Partner <br />10/5/2010 <br />W Howard Keenan Jr <br />Manager <br />10/5/2010 <br />Peter Leidel <br />Manager <br />10/5/2010 <br />Tomas LaCosta <br />Manager <br />10/5/2010 <br />Robert Signorino <br />Manager <br />10/5/2010 <br />This is a publicly traded entity <br />— with no person or entity with 10% or more ownership <br />MR -57 -26- 06/17 <br />