Exhibit 99.3



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February 9, 2012

Mr. Mark Paull

Vice President

Corporate Strategy and Planning

Quantum Resources Management, LLC

5 Houston Center

1401 McKinney Street, Suite
2400

Houston, Texas 77010



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| |  |  |  |  | Re: |  |  | Quantum Resources Management, LLC
| |  |  |  |  |     |  |  | Reserves and Future Net Revenues 
| |  |  |  |  |     |  |  | As of December 31, 2011          
| |  |  |  |  |     |  |  | SEC Price Case                   

Dear Mr. Paull:

At your request, Miller and Lents, Ltd. (MLL) estimated the proved oil, gas, and natural gas liquids (NGL) reserves and projected future net revenues associated with these reserves as of December 31,
2011, attributable to the Quantum Resources Management, LLC (Quantum) net interests in properties located in the continental United States in Alabama, Florida, Louisiana, Mississippi, Oklahoma, and Texas. This report was prepared for Quantums
use in financial reporting and planning and was completed on February 9, 2012.

MLL performed its evaluation, designated
as the SEC Price Case, using prices, operating expenses, and capital expenditures provided by Quantum. The SEC Price Case assumes no future escalation of product prices, operating expenses or capital expenditures above the respective
December 31, 2011 values. The aggregate results of MLLs evaluation are as follows:

Reserves and Future Net
Revenues as of December 31, 2011



|                    |  |              |         |  |                     |  |          |            |  |  |                 |  |  |                              |           |  |  |  |           | 
|------------------- |  | ------------ | ------- |  | ------------------- |  | -------- | ---------- |  |  | --------------- |  |  | ---------------------------- | --------- |  |  |  | --------- | 
|                    |  | Net Reserves |         |  | Future Net Revenues | 
|Reserves Category   |  | Oil,MBbls.   |         |  | Gas,MMcf            |  |          | NGL,MBbls. |  |  | Undiscounted,M$ |  |  | Discountedat 10% Per Year,MS |          
|Proved Producing    |  |              | 8,178.3 |  |                     |  | 21,604.2 |            |  |  | 3,347.1         |  |  |                              | 517,847.6 |  |  |  | 328,110.2 | 
|Proved Nonproducing |  |              | 502.2   |  |                     |  | 484.3    |            |  |  | 73.9            |  |  |                              | 18,006.3  |  |  |  | 12,302.8  | 



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|Mr. Mark Paull                    |  | February 9, 2012
|Quantum Resources Management, LLC |  | Page
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|                   |  |  |          |  |  |  |          |  |  |  |         |  |  |  |           |  |  |  |           | 
|------------------ |  |  | -------- |  |  |  | -------- |  |  |  | ------- |  |  |  | --------- |  |  |  | --------- | 
|Proved Developed   |  |  | 8,680.5  |  |  |  | 22,088.6 |  |  |  | 3,421.0 |  |  |  | 535,853.8 |  |  |  | 340,413.0 | 
|Proved Undeveloped |  |  | 1,626.0  |  |  |  | 474.2    |  |  |  | 98.6    |  |  |  | 94,166.0  |  |  |  | 49,360.2  | 
|Total Proved       |  |  | 10,306.5 |  |  |  | 22,562.8 |  |  |  | 3,519.6 |  |  |  | 630,019.8 |  |  |  | 389,773.2 | 



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|Mr. Mark Paull                    |  | February 9, 2012
|Quantum Resources Management, LLC |  | Page
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Reserves and future net revenues were estimated in accordance with the standards of the
Securities and Exchange Commission Regulation S-X, Rule 4-10(a) as shown in Appendix 1. Gas volumes for each property are stated at the pressure and temperature bases appropriate for the sales contract or state regulatory authority. Total gas
reserves were obtained by summing the reserves for all the individual properties and are, therefore, stated herein at a mixed pressure base. No provisions for the possible consequences of product sales imbalances, if any, were included in MLLs
projections since we have received no relevant data. Analysis of gas plants and gathering systems was beyond the scope of this evaluation. Therefore, MLL assumed that these facilities will continue to operate through the economic life of the wells
included herein.

Future net revenues as used herein are defined as the total revenues attributable to (1) Quantums
working interest less royalties, overriding royalties, production and ad valorem taxes, operating costs, and future capital expenditures; and (2) Quantums royalty interest less production and ad valorem taxes. MLLs projections of
future net revenues are shown both undiscounted and discounted at 10 percent per year. The effects of depreciation, depletion, or Federal Income Tax are not considered. Estimates of future net revenues and discounted future net revenues are not
intended and should not be interpreted to represent fair market value for the estimated reserves.

Abandonment costs were
provided by Quantum except where it was assumed that the abandonment costs would be equal to the salvage value of existing equipment upon abandonment of the wells. Future costs, if any, to satisfy environmental standards were not deducted from
future net revenues as such estimates were beyond the scope of this assignment.

Future prices and costs were provided by
Quantum. No future escalation of prices or costs were assumed. Operating costs, price differentials from selected benchmarks, and BTU and shrinkage adjustments were included for each well or lease, based on recent actual averages provided by
Quantum. Operating expenses included both a component cost per well month and a component cost per unit volume produced. Ad valorem and severance taxes were projected based on recent averages or legislated rates. Capital costs for drilling and
completion of future wells and recompletion of existing wells were based on recent actual experience and estimates as provided by Quantum.

Product prices were projected using selected spot price benchmarks (West Texas Intermediate crude oil sold at Cushing, Oklahoma and gas sold at the Henry Hub) with appropriate differentials applied for
each well, lease, or area. The SEC prices applicable for year-end 2011 reserves disclosures are calculated for each product as the average of the prices existent on the first day of each month in 2011. For our cash flow projections, constant prices
were used throughout the life of production in accordance with SEC guidelines. The SEC-compliant benchmark prices used herein were $96.19 per barrel for oil and $4.118 per million Btu for gas. Price adjustments were made for each property based on
differentials between benchmark and actual prices as estimated by Quantum and include considerations such as gas Btu content, oil gravity, and transportation charges. The actual average prices used in this report for proved reserves, after
appropriate adjustments, were $102.90 per barrel for oil, $48.93 per barrel for NGLs, and $4.17 per Mcf for gas.



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|Mr. Mark Paull                    |  | February 9, 2012
|Quantum Resources Management, LLC |  | Page
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Quantum has advised us that MLLs estimates herein represent 100 percent of its
booked reserves for year-end 2011. All reserves are in the United States and are grouped into two geographic divisions as described below. Forecasts of production and future net revenues for the total reserves by category are included as Exhibits 1
through 4. A one-line summary sorted by reserves category, area, field group, and lease is included as Exhibit 5. Forecasts of production and future net revenues for the two producing areas: (1) Gulf Coast and (2) Mid-Continent are
included in Exhibits 6 through 13.

Reserves estimates were based on decline curve extrapolations, material balance
calculations, volumetric calculations, analogies, or combinations of these methods for each well, reservoir, or field as necessary to prepare the report. Proved producing reserves were based primarily on extrapolation of historical performance
trends. In some cases with wells producing at high water-cuts, water-oil ratios versus cumulative production trends were used to estimate reserves. MLL relied mainly on production rate versus time decline curves. Estimates and projections for proved
nonproducing and proved undeveloped reserves were mainly based on volumetric calculations or analogies. Reserves estimates from analogies and volumetric calculations are often less certain than reserves estimates based on well performance obtained
over a period during which a substantial portion of the reserves were produced.

In conducting this evaluation, MLL relied
upon accounting; cost; ownership; price differential; NGL yield; geological, geophysical, and engineering data; production histories and development plans supplied by Quantum; and non-confidential data from public records or commercial data
services. These data were accepted as represented and are considered appropriate for the purpose served by the report. MLL used all methods, procedures, and assumptions as it considered necessary and appropriate under the circumstances in using the
data provided to prepare the report.

The evaluations presented in this report, with the exceptions of those parameters
specified by others, reflect our informed judgments and are subject to the inherent uncertainties associated with interpretation of geological, geophysical, and engineering information. These uncertainties include, but are not limited to,
(1) the utilization of analogous or indirect data and (2) the application of professional judgments. Government policies and market conditions different from those employed in this study may cause (1) the total quantity of oil,
natural gas liquids, or gas to be recovered; (2) actual production rates; (3) prices received; or (4) operating and capital costs to vary from those presented in this report. At this time, MLL is not aware of any regulations that
would affect Quantums ability to recover the estimated reserves. Minor precision inconsistencies in subtotals may exist in the report due to truncation or rounding of aggregated values.

Miller and Lents, Ltd. is an independent oil and gas consulting firm. No director, officer, or key employee of Miller and Lents, Ltd. has
any financial ownership in Quantum or any affiliate of Quantum Resources Management, LLC. MLLs compensation for the required investigations and preparation of this



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|Mr. Mark Paull                    |  | February 9, 2012
|Quantum Resources Management, LLC |  | Page
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report is not contingent upon the results obtained and reported, and we have not performed other work that would affect MLLs objectivity. Production of this report was supervised by R. Lee
Comer, Jr., an officer



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|Mr. Mark Paull                    |  | February 9, 2012
|Quantum Resources Management, LLC |  | Page
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of the firm who is a professionally qualified and licensed Professional Engineer in the State of Texas
with more than 25 years of relevant experience in the estimation, assessment, and evaluation of oil and gas reserves.

Very truly yours,

MILLER AND LENTS, LTD.

Texas Registered Engineering Firm No. F-1442



|       |  |    |  |                        
|------ |  | -- |  | -----------------------
|       |  | By |  | /s/ R. Lee Comer, Jr.  
|       |  |    |  | R. Lee Comer, Jr., P.E.
|RLC/jj |  |    |  | Vice President