Exhibit 99.1

RANDGOLD RESOURCES LIMITED

Incorporated in Jersey, Channel Islands

Reg. No. 62686

LSE Trading Symbol: RRS

NASDAQ Trading Symbol: GOLD

OBUASI GOLD MINE

Jersey, Channel Islands, 21 December 2015

On 16 September 2015, Randgold Resources Limited (Randgold) and AngloGold Ashanti Limited (AngloGold Ashanti) announced their intention to form a joint venture to redevelop AngloGold Ashanti’s Obuasi mine in Ghana, subject among other things to the completion of satisfactory due diligence by Randgold and the agreement of a revised development plan. After undertaking a due diligence exercise into the mine and the redevelopment opportunity the mine affords, and following the work undertaken on the revised development plan, Randgold has determined that the development plan will not satisfy Randgold’s internal investment requirements. Accordingly, Randgold has decided to terminate the investment agreement entered into with AngloGold Ashanti, with immediate effect.

Chief Executive Mark Bristow said Randgold remained committed to creating real value for all its stakeholders by continuing to invest substantially in its exploration programmes with their proven record of success as well as by investigating potential growth opportunities presented by the market.

RANDGOLD ENQUIRIES

Chief Executive Mark Bristow +44 788 071 1386 +44 779 775 2288 Financial Director Graham Shuttleworth +44 1534 735 333 +44 779 771 1338 Investor & Media Relations Kathy du Plessis +44 20 7557 7738 randgold@dpapr.com

www.randgoldresources.com

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS: Except for the historical information contained herein, the matters discussed in this news release are forward-looking statements within the meaning of Section 27A of the US Securities Act of 1933 and Section 21E of the US Securities Exchange Act of 1934, and applicable Canadian securities legislation. Forward-looking statements include, but are not limited to, statements with respect to the future price of gold, the estimation of mineral reserves and resources, the realisation of mineral reserve estimates, the timing and amount of estimated future production, costs of production, reserve determination and reserve conversion rates. Generally, these forward-looking statements can be identified by the use of forward-looking terminology such as 'will', 'plans', 'expects' or 'does not expect', 'is expected', 'budget', 'scheduled', 'estimates', 'forecasts', 'intends', 'anticipates' or 'does not anticipate', or 'believes', or variations of such words and phrases or state that certain actions, events or results 'may', 'could', 'would', 'might' or 'will be taken', 'occur' or 'be achieved'. Assumptions upon which such forward-looking statements are based are in turn based on factors and events that are not within the control of Randgold Resources Limited (‘Randgold’) and there is no assurance they will prove to be correct. Forward-looking statements are subject to known and unknown risks, uncertainties and other factors that may cause the actual results, level of activity, performance or achievements of Randgold to be materially different from those expressed or implied by such forward-looking statements, including but not limited to: risks related to mining operations, including political risks and instability and risks related to international operations, actual results of current exploration activities, conclusions of economic evaluations, changes in project parameters as plans continue to be refined, as well as those factors discussed in Randgold’s filings with the US Securities and Exchange Commission (the 'SEC'). Although Randgold has attempted to identify important factors that could cause actual results to differ materially from those contained in forward-looking statements, there may be other factors that cause results not to be as anticipated, estimated or intended. There can be no assurance that such statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements. Randgold does not undertake to update any forward-looking statements herein, except in accordance with applicable securities laws. CAUTIONARY NOTE TO US INVESTORS: The SEC permits companies, in their filings with the SEC, to disclose only proven and probable ore reserves. We use certain terms in this report, such as 'resources', that the SEC does not recognise and strictly prohibits us from including in our filings with the SEC. Investors are cautioned not to assume that all or any parts of our resources will ever be converted into reserves which qualify as 'proven and probable reserves' for the purposes of the SEC's Industry Guide number 7