Exhibit A Interested Parties Docket No. 170900606 After receipt of updated due diligence title information, which affects this Spacing Application submitted to COGCC on July 13, 2017, by Beatty & Wozniak, P.C. (then current counsel to Verdad), Verdad hereby updates the Exhibit A-Interested Parties List to the Affidavit of Mailing filed on July 19, 2017 by Beatty & Wozniak, P.C. (Deleted entities are indicated with a stikethrough, and new entities are in BOLD) Albert R. Sirios 6500 Weld County Road - #89 Roggen, CO 80652 Anadarko E&P Company 1201 Lake Robbins Drive The Woodlands, TX 77380 Anadarko Petroleum Corporation 1099 18 th Street - Suite 1800 Anschutz Exploration Corporation 555 17 th Street - Suite 2400 Arthur and Elaine Ferguson 3042 South Ivan Way Denver, CO 80227-3838 B. Todd Griffin & Velita C. Griffin 766 Chambers Road - Apt #204 Aurora, CO 80017 Bill Barrett Corporation 1099 18 th Street - Suite 2300 Billy W. Griffin and Kathleen J. Griffin 633 17 th Street - Suite 1960 Blue Creek, Inc. 1801 Broadway - Suite 760 Bonanza Creek Energy Operating Company, LLC 410 17 th Street - Suite 1400 Boyd Berlind 1331 Oceanfront Walk Suite 300 Santa Monica, CA 90401 BP America 501 Westlake Park Boulevard Houston, TX 77079 Brandon Marette, Energy Liaison Colorado Parks & Wildlife Northeast Region Office 6060 Broadway Denver, CO 80216 Bruce P. Emmeluth C/O Seidler Amdec Securities, Inc. 515 South Figueroa St. Los Angeles, CA 90071 C.M. Lederhos 7777 Alkire St. Arvada, CO 80005 CF&C Genesis Liquidating Trust 1675 Broadway - Suite 2800 Christian Dome 1331 Oceanfront Walk - Suite 300 Santa Monica, CA 90401 Damian J. and Katherine M. Lederhos 122 North Second Street Sterling, CO 80751

Darwin R. Giersch 400 S 50 Burley, ID 83318 David Phillips 2644 21st Avenue Court Greeley, CO 80631 Dean R. Gackle and Margaret B. Gackle 6500 Weld County Road #89 Roggen, CO 80652 Dennis J. and Yvonne Gara 277 Old Ashley Loop Pawley's Island, SC 29585 Dolores Schlidt 295 10th Street Penrose, CO 81240 Donald A. and J. Frances Lederhos a/k/a/ Juanita Frances Lederhos Katka Mountain HCR 85 Bonners Ferry, ID 83805 Doris A. Fields Trust 9082 WCR 52 Milliken, CO 80543 Double Eagle Limited Partnership 1401 Ballinger Street - #200 Fort Worth, TX 76102 Double Eagle, Ltd. and Boyd F. Berlind (and their successors in interest) 11726 San Vicente Blvd - Suite 310 Los Angeles, CA 90049 Edward J. Hans C/O Seidler Amdec Securities, Inc. 515 South Figueroa St. Los Angeles, CA 90071 Elmer D. Werth 4890 Kipling Street Wheat Ridge, CO 80033-2246 Estate of Fred W. Seelhoff c/o Terry F. Seelhoff 1401 29 th Avenue County Greeley, CO 80634 Frank E. Johnson Trustee of Trust No. 101, dated January 4, 1990 538 W. Exchange Street Sycamore, IL 60178 Gara Minerals, LLC P.O. Box 63 Huntley, WY 82218-0063 Gayle M. Cox 2223 Harvard Ct. Longmont, CO 80503-9116 George R. Getz 156 Pennsylvania Ave. Chalfant, PA 18914 Gerald C. Sloat 1823 Folsom St. Boulder, CO 80302 Gilbert L. Lederhos 9525 Newton Street Westminster, CO 80030 Glenna Mohler 8276 Balsam Way Arvada, CO 80005 Gregory and Lawren Getz 26311 Andrew Arbor Ct. Cypress, TX 77433

Griff Oil & Gas, Inc. P.O. Box 410 450 Erie, CO 80516 Gunsmoke Production Company 1720 Wazee Street - Suite 2E Harold M. Klausner c/o Jerry D. Winters 5754 West 11 th Street - Suite 101 Greeley, CO 80634 Harry W. Need IV 7726 S. Trenton Ct. Englewood, CO 80112-2636 HRM Resources, LLC 410 17 th Street James D. Mitchell 1228 Forest Hills Lane Fort Collins, CO 80524 James E. Kurtzman 644 Peoria Street Aurora, CO 80011 James E. Moore 7742 Redlands Street - Unit #H-1021 Playa Del Ray, CA 90293 James F. Hansen P.O. Box 6983 Denver, CO 80206 Joseph J. and Paula G. Lederhos 3290 Jay St. Wheat Ridge, CO 80033 Joyce Giersch 400 South 50 Burley, ID 83318 Kent Kuster Oil & Gas Consultant Coordinator Colorado Dept of Public Health & Env 4300 Cherry Creek Drive South Denver, CO 80246-1530 K.P. Kauffman Company, Inc. 1675 Broadway - Suite 2800 Kerr-McGee Oil & Gas Onshore LP 1099 18 th Street - Suite 1800 Lewis W. Cox and Paula J. Lindamood, JT 2223 Harvard CT Longmont, CO 80503-9116 Lloyd L. Land and Eileen E. Land, JT 12501 Riverdale Road Brighton, CO 80602 Mendell-Denver Corporation 8983 East Union Avenue - Suite 214 Englewood, CO 80111-1357 Michelle Conkling C/O Karen Oil Co. 518 17th Street Suite 340 Moritz E. Baessler & Sheila M. Baessler c/o Baessler Land, LLC 3505 Holman Court Greeley, CO 80631 Nadine Johnson Trustee of Trust No. 102, Dated January 4,1990 538 W. Exchange Street Sycamore, IL 60178 Oscar R. Lee 354 South 21st Street Brighton, CO 80601

Petro-Canada Resources (USA) Inc. Corporation 999 18th Street - Suite 600 RME Petroleum Company 17001 Northchase Drive Houston, TX 77060-2141 Robert and Mary E. Lederhos 516 N. 4 th Ave. Sterling, CO 80751 Robert D. Fields Trust 9082 WCR 52 Milliken, CO 80543 Robert Shonkwiler P.O. Box 38669 Colorado Springs, CO 80937-8669 Rodney Schlidt 43047 Highway 52 Roggen, CO 80652 Ronald and Warrena Bonnett 6048 E. Briarwood Cir. Englewood, CO 80112 Ronald D. Keller 8268 Balsam Way Arvada, CO 80005 Ray and Susan Montierth 825 Heartland Dr. Nampa, ID 83686 Ray and Susan Montierth Route 1 - Poen Road Kuna, ID 83634 Russell C. Epple & Alma E. Epple 16436 Road 19 Fort Morgan, CO 80701 Shawn D. Keil Personal Representative of the Estate of Edward Allen Keil, deceased 3014 Chase Street Wheat Ridge, CO 80214 Stan Jolley, as an individual, and Stan Jolley as Personal Representative of the Estate of Birdie Jolley, Deceased PO Box 130 Baggs, WY 82321 Stephanie J. Keil Personal Representative of the Estate of Edward Allen Keil, deceased 3140 Steele Street Denver, CO 80205 Steve D. Sander 669 Washington Street - #705 Denver, CO 80203 Tandem Oil Company 1543 Corinth Avenue Los Angeles, CA 90025 Terry F. Seelhoff, a.k.a. Terrance F. Seelhoff 1635 46th Avenue Court Greeley, CO 80634 Thomas B. Majors P.O. Box 1128 Platteville, CO 80651-1128 Troy Swain Weld County Dept of Planning Services 1555 North 17 th Ave. Greeley, CO 80631 Veralyn M. Keller 8268 Balsam Way Arvada, CO 80005 Verdad Resources LLC 5950 Cedar Springs Rd. - Ste. 200 Dallas, TX 75235 Walter Oshetski 814 Arrowwood Street Longmont, CO 80503

William A. Venohr P.O. Box 523 Sterling, CO 80751 WYOTEX Drilling Ventures, LLC P.O. Box 280969 Lakewood, CO 80228-0969