Exhibit 99.1

Cawley, Gillespie & Associates, Inc.

petroleum consultants

February 15, 2016

Dear Mr. Fischer:

As requested, we are submitting estimates of total proved reserves and forecasts of economics attributable to the Chaparral Energy, LLC (“Chaparral”) interests in certain oil and gas properties located in various states. Cawley, Gillespie & Associates, Inc. (“CG&A) evaluated the “major” properties, which comprise the top 42 percent of Chaparral’s total proved discounted present value and 91 percent of the total proved discounted present value of Chaparral’s E&P region (as estimated by Chaparral), with tabular results presented in the accompanying tabulations. A composite summary presented below:

Exhibit 99.1

Chaparral Energy, LLC Interests

February 15, 2016

Page 2

The Discounted cash flow value shown above should not be construed to represent an estimate of the fair market value by Cawley, Gillespie & Associates, Inc.

Presentation

This report is divided into five reserve category sections:  Total Proved (“TP”), Proved Developed Producing (“PDP”), Proved Developed Non-Producing Shut-In (“PDNP-SI”), Proved Developed Non-Producing Behind-Pipe (“PDNP-BP”), and Proved Undeveloped (“PUD”).  Every reserve category contains a Table I which presents composite reserve estimates and economic forecasts for the particular reserve category. The data presented in the summary tables are explained on page 1 of the Appendix.  The methods employed in estimating reserves are described in page 2 of the Appendix. For a more detailed explanation of the report layout, please refer to the Table of Contents following this letter.

Hydrocarbon Pricing

As requested, adjustments were applied to the Chaparral furnished initial oil and gas prices of $50.28 per BBL and $2.580 per MMBTU, respectively, as quoted on December 31, 2015. Prices were not escalated. Oil and gas price differentials were forecast on a per property basis. Gas price differentials include adjustments for heating value, gas shrinkage, transportation and basis differential.

Expenses and Taxes

Lease operating costs and investments were forecast on a per property basis as furnished by your office and were not escalated.  Per well operating expenditures were applied against a projected well-count as provided by your office.  Severance tax values were applied at normal state percentages of oil and gas revenue.  Ad Valorem tax rates were forecast as provided by your office.

Miscellaneous

An on-site field inspection of the properties has not been performed nor has the mechanical operation or condition of the wells and their related facilities been examined, nor have the wells been tested by Cawley, Gillespie & Associates, Inc.  Possible environmental liability related to the properties has not been investigated nor considered.

The proved reserve classifications used herein conform to the criteria of the Securities and Exchange Commission (“SEC”) as defined in page 3 and 4 of the Appendix.  The reserves and economics are predicated on regulatory agency classifications, rules, policies, laws, taxes and royalties in effect on the effective date, except as noted herein.  The possible effects of changes in legislation or other Federal or State restrictive actions have not been considered. All reserve estimates represent our best judgment based on data available at the time of preparation, and assumptions as to future economic and regulatory conditions.  It should be realized that the reserves actually recovered, the revenue derived therefrom and the actual cost incurred could be more or less than the estimated amounts.

The reserve estimates and forecasts were based upon interpretations of data furnished by your office and available from our files.  Production data, ownership information, price differentials, expenses, projected well count, investments and tax rates were furnished by your office and were accepted as furnished.  To some extent, information from public records was used to check and/or supplement these data.  The basic engineering and geological data were utilized subject to third party reservations and qualifications.  Nothing has come to our attention, however, that would cause us to believe that we are not justified in relying on such data.

Chaparral Energy, LLC Interests

February 15, 2016

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Cawley, Gillespie & Associates, Inc. is a Texas Registered Engineering Firm (F-693), made up of independent registered professional engineers and geologists that have provided petroleum consulting services to the oil and gas industry for over 50 years.  We do not own an interest in the properties or Chaparral Energy, LLC and are not employed on a contingent basis.  We have used all methods and procedures that we consider necessary under the circumstances to prepare this report. Our work-papers and related data utilized in the preparation of these estimates are available in our office.

Yours very truly,