• 2.39 g/t Au over 24 m in DD-12-130
• 2.22 g/t Au over 16 m including 3.28 g/t over 8 m in DD-12-139
• 2.10 g/t Au over 12 m in DD-11-069
• 2.02 g/t Au over 12 m in DD-12-149
• 31.8 g/t Au over 2 m and 2.42 g/t over 6 m in DD-12-131
• 1.84 g/t Au over 14 m in DD-12-72

Mineralization at Kao extends over 1,400 metres in a northeast-southwest direction and at least 900 metres down-dip to the east. These latest drill holes confirm the continuation of higher grade material along strike to the northwest and at depth, with the deposit remaining open to the north, south and down the dip to the east.

“The extension drilling at Kao continues to return higher grades than the modelled average grade of the deposit,” commented Dwayne L. Melrose, President and CEO of Riverstone. “This is expected to have a positive effect on the upcoming resource estimate, which is on track for completion in late September of 2012. The updated resource model has the potential to increase the mine life or annual gold production that was identified in the recently released PEA results.”

A more complete summary of significant results in these drill holes is presented in the following table:

The 100% owned Kao is part of the Company’s Karma Project which comprises a NI 43-101 compliant in-pit Whittle indicated resource of 1.6 million ounces of gold in 47.3 million tonnes grading 1.1 g/t gold and an inferred resource of 0.6 million ounces of gold in 18.9 million tonnes grading 0.93 g/t gold (see news release dated January 9. 2012 and NI 43-101 Technical Report titled “Technical Report and Resource Estimate on the Karma Project, Burkina Faso, West Africa” filed on SEDAR (www.sedar.com) February 23, 2012.) Since the data cut-off for the resource estimation, the Company has already completed +85,000 metres of drilling on the Karma Project. It is expected that the results of this drilling will add to the overall resources of the Karma Project deposits. The results of a Preliminary Economic Assessment have recently been released(see Company news release dated August 20, 2012), highlighting the Karma Project to be a robust project.

Riverstone maintains a quality control program involving the use of repeat assays, inserted blanks and the use of certified standards from an accredited Canadian laboratory. All samples were prepared at the independent Abilab Burkina SARL laboratory in Ouagadougou, Burkina Faso, West Africa (part of the ALS Chemex Group), and assayed using standard fire assay with an atomic absorption finish, with samples grading over one gram per tonne gold re-assayed with a gravimetric finish, either in Burkina Faso or at the ALS Chemex facility in North Vancouver, British Columbia, Canada.

Riverstone is active in Burkina Faso, West Africa, where it holds a portfolio of four high quality exploration projects covering in excess of 2,000 square kilometres. Addition information about the Company and its activities may be found on the Company’s website atwww.riverstoneresources.com and under the Company’s profile at www.sedar.com.

ON BEHALF OF THE BOARD

Dwayne L. Melrose, President & CEO

Giles R. Peatfield, Ph. D., P.Eng. is the Qualified Person for RVS and has reviewed and approved the contents of this release.

Certain statements made and information contained in this news release and elsewhere constitutes “forward-looking information” within the meaning of Canadian securities legislation. Forward-looking statements are based on certain assumptions and are subject to risks and uncertainties which could cause actual events or results to differ from those reflected in the forward-looking statements, including, without limitation, with respect to statements regarding the updated resources estimate, anticipated timing and completion of a definitive feasibility study, mine development schedule, the granting of exploitation permits, the anticipated timing an completion of a NI 43-101 compliant technical report supporting the PEA, the assumptions set forth in this news release and in the Company’s news releases of January 9, 2012 and August 20, 2012, and risks and uncertainties relating to the interpretation of drill results and the estimation of mineral resources, the geology, grade and continuity of mineral deposits, the possibility that future exploration, development results will not be consistent with the Company’s expectations, accidents, equipment breakdowns, risk of undiscovered, title defects and surface access, labour disputes, the potential for delays in exploration and permitting activities, the potential for unexpected costs and expenses, commodity price fluctuations, currency fluctuations, political risk and other risks and uncertainties, including those described under Risk Factors in each management discussion and analysis and in the Company’s annual information form which are available under the Company’s profile at www.sedar.com. Forward-looking information is based on various assumptions including, without limitation, the expectations and beliefs of management, the assumed long term price of gold, that the Company will receive required permits and access to surface rights, that the Company can access financing, appropriate equipment and sufficient labour and that the political environment within Burkina Faso will continue to support the development of environmentally safe mining projects. Should one or more of these risks and uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those described in forward-looking statements. Accordingly, readers are advised not to place undue reliance on forward-looking statements.

This news release may use the terms “measured”, “indicated” and “inferred” as these terms are defined under Canada’s National Instrument 43.101. U.S. Investors are advised that, while such terms are recognized and required by Canadian regulations, they are not recognized by the United States Securities and Exchange Commission (“SEC”) and may not be comparable to similar information for United States mining or exploration companies. As such, certain information contained on this news release concerning descriptions of mineralization and resources under Canadian standards is not comparable to similar information made public by United States companies subject to the reporting and disclosure requirements of the SEC. U.S. investors are cautioned not to assume that any part or all of the mineral deposits described in these categories will ever be converted into proven or probable reserves, as defined in the SEC’s Industry Guide No. 7.